Rick Strahl's Web Log
Wind, waves, code and everything in between...
Ad-free experience sponsored by:
- the market leader of .NET and Java APIs for file formats – natively work with DOCX, XLSX, PPT, PDF, images and more
Recent Weblog Posts
October, 2020 (3)
September, 2020 (2)
August, 2020 (1)
July, 2020 (4)
June, 2020 (3)
May, 2020 (5)
April, 2020 (2)
March, 2020 (3)
February, 2020 (3)
January, 2020 (1)
December, 2019 (2)
November, 2019 (3)
October, 2019 (1)
Visual Studio (52)
ASP.NET Core (51)
Web Services (19)
.NET Core (16)
Web Api (16)
Sql Server (9)
Microsoft AJAX (8)
West Wind Ajax Toolkit (7)
Web Connection (7)
Entity Framework (6)
Internet Explorer (6)
Html Help Builder (5)
Live Writer (5)
Source Control (4)
Markdown Monster (4)
Help Builder (3)
Web Browser Control (3)
Software Development (3)
Visual Studio Code (2)
ASP.NET vNext (2)
.NET Standard (2)
Visual Studio (1)
ASP.NET Markdown (1)
Control Development (1)
Credit Card Processing (1)
Dynamic Types (1)
VS Code (1)
Web Assembly (1)
Web Deployment Projects (1)
Web Design (1)
PC and Mac with single Mouse and Keyboard Setup on Dual 4k Screens
October 15, 2020 - Maui, Hawaii
A little while back I posted a couple of pictures of my new desk setup using both a Windows Laptop (a 2019 Dell XPS) and a Macbook Pro (2016) along with two 4k displays. I'm also using a single Logitech Mouse and Keyboard combination to control both machines and quite a few people were asking about how this works. So I decided to write a quick review of my setup here to give a few more details that are hard to give in a Twitter conversation.
Window Activation Headaches in WPF
October 12, 2020 - Maui, Hawaii
Ran into a problem with properly activating a WPF when launching from Explorer and indirectly trying to activate an already running instance 'from within itself'. It seems simple, but windows focus-stealing restrictions can cause problems with actually getting focus into an application window. Here's how.
Creating Custom .NET Project Types with .NET CLI Project Templates
October 05, 2020 - Maui, Hawaii
Custom project templates can be extremely useful in quickly creating new projects especially for extensible applications. They're also great for creating specialized setups to make it quicker to hit the ground running. With the .NET SDK tooling new project templates are now easy to create and this post takes you through the process.
Wrestling with Clipboard Images in WPF
September 16, 2020 - Maui, Hawaii
Retrieving images from the clipboard with WPF seems so simple, but once you get into it you'll find that there are lots of problems with reliable image retrieval that works for all images. In this post I talk about the different issues you're likely to run into and one hacky but flexible solution to better image support by selectively sniffing image formats and using different clipboard retrievals based on the image format.
Don't get burned by missing await Calls for Async Code in ASP.NET Core Middleware
September 14, 2020 - Maui, Hawaii
I recently got burned in an upgraded ASP.NET Core server application where a missing `await` statement caused wildly inconsistent and puzzling output failures. While a simple thing to avoid, once introduced it's possible to live with this error for some time before it manifests. In this post I show a scenario where a missing `await` was causing infrequent HTTP response errors, even though the client apparently receives a valid response.
Using .NET Core Tools to Create Reusable and Shareable Tools & Apps
August 05, 2020 - Maui, Hawaii
Dotnet Tools offer a simple way to create, publish and consume what are essentially .NET Core applications that can be published and shared using the existing NuGet infrastructure for packaging and distribution. It's y quick and easy to build tools that you can share either publicly or privately. In this article I make a case for why you might use or build a Dotnet Tool and show how create, build, publish and consume Dotnet tools as well as showing some examples of useful tools I've build and published.
Using the brightness() CSS Filter to generically highlight Content
July 28, 2020 - Maui, Hawaii
Filters are not new in CSS, but their often overlooked for providing some useful generic behaviors for things like hover styling or nice background effects. In this post I discuss how to use the brightness() filter to create a generic button hover behavior and also briefly discuss the newish `backdrop-filter` property.
Excluding Files and Folders in Visual Studio Web Site Project
July 25, 2020 - Maui, Hawaii
I still use Web Site projects frequently for purely static Web sites that don't require a proper build process where 'DevOps' of any kind is overkill. Invariably when using Web site projects though, I end up requiring that 1 or 2 files are excluded on publishing and every time I do I spent a while trying to find the information how to do that in the `.pubxml` file. Well no more - I'm writing it down this time.
Handling SPA Fallback Paths in a Generic ASP.NET Core Server
July 12, 2020 - Maui, Hawaii
When building ASP.NET Core backends for SPA applications one thing that you have to worry about is how to handle client side routes that end up being fired against the server through external or reloaded links. While ASp.NET Core has built-in support for this if you build a generic Web server, you might need a little more control on how to handle the Fallback routing functionality. Here's how.
A .NET Color Console Helper
July 10, 2020 - Maui, Hawaii
In this short post I'll discuss a small Console helper class I've been using to make it easier and more consistent to use colors with the .NET Console command. The .NET Console support colors easily enough, but switching colors and resetting them can be a bit tedious, so these helpers make working with color a bit easier.
Mirror your iOS Device Screen on Windows with the free 5KPlayer
June 26, 2020 - Maui, Hawaii
Apple doesn't exactly make it easy to use iOS devices on Windows and one complication is how you can cast your iOS device to a Windows screen. This is useful for presentations or screen captures that I often do and in the past i've gone through a number of shady tools that have come and gone. Recently ran into 5KPlayer which is a nice video player that as a bonus acts as an AirPlay server and makes short work of casting iOS content to Windows
Using Angular's Live Reload Web Server to Refresh Pages on a Phone
June 23, 2020 - Maui, Hawaii
Live Reload is now common for client side application development and it has become ubiquitous for Web development. But setting up Live Reload to work on a phone is not quite so obvious. In this post I'll walk you through what you need to do to get Live Reload to work on a mobile device for more productive on-device execution.
Adding Additional Mime Mappings to the Static File Provider
June 12, 2020 - Maui, Hawaii
If you're using the Static File Provider in ASP.NET Core you might need to add some additional extensions that are not handled by default. For example, if you host a Blazor site in your own application an additional mime mapping for `.dll` is required. Here how you can map extra extensions to the Static File middleware.
ASP.NET Core WebSockets and Application Lifetime Shutdown Events
May 28, 2020 - Maui, Hawaii
WebSockets in ASP.NET Core are easy to use but due to the simple model it's easy to forget that socket requests are long lived and can linger for a long time in the background and that can cause problems when an application needs to shut down cleanly. Luckily there's an `IHostApplicationLifetime` interface available that allows hooking shutdown operations and that provides the necessary cancellation tokens to allow an WebSocket connection to be terminated in response to a shutdown event. This post shows how this works.
Fixing Adsense Injecting 'height: auto !important' into scrolled Containers
May 25, 2020 - Maui, Hawaii
Ran into a weird issue today with AdSense in one of my older Web sites. I noticed that the site was not using the custom scrolling in containers that I've been using for years. Turns out Google's AdSense on this page is injecting some extra styling that changes the scroll behavior - and the way the entire page works. Here's what the problem is and how you can work around it.
Jekyll Test Post
May 21, 2020 - Maui, Hawaii
This is a Jekyll Test Post - no really: Points: Getting Started Working with Jekyll posts Updating the data Note there's a no good reason to ignore this content.
Using WSL to Launch Several Bash Commands from an Application
May 19, 2020 - Maui, Hawaii
Struggled today with launching WSL from a Windows application to automate an external build process. Turns out this was a lot harder than it should have been due to some quirks on how the `wsl.exe` and `bash.exe` are registered by the Windows Sub System for Linux.
Static Constructor Failures and Declaration Order
May 04, 2020 - Maui, Hawaii
I ran into an ugly problem today with an application where nested static constructors where not doing the expected thing - failing to provide a value when one should be available. It turns out the issue has to do with constructor calls nesting and the order in which auto-initialized values are assigned.
Missing Sharing Tab in Windows Explorer and Sharing with PowerShell
April 13, 2020 - Maui, Hawaii
On several of my machines I've found that the 'Sharing Tab' in Explore had gone missing and I've been unable to create a share through the Windows UI. Apparently some update or software installed mucked with my settings that created an explicit exclusion to disable this Shell Addin. In this post I describe how to fix this problem and then offer several solutions: Fixing the UI problem and maybe more usefully show how you can use Powershell to share a folder or drive instead of the Windows UI.
Displaying Nested Child Objects in the Windows Forms Designer Property Grid
April 06, 2020 - Maui, Hawaii
The Windows Forms designer sometimes feels very dumb - one of those times is when dealing with nested properties on a control which by default is not displayed as an expandable property that you can just dig into. Instead you have to do a bit of busy work using a TypeConverter to make it possible to create an expandable property in the designer. Here's how.
Content Injection with Response Rewriting in ASP.NET Core 3.x
March 29, 2020 - Maui, Hawaii
If you're creating middleware components you might need at some point to inject content in the existing HTTP output stream in ASP.NET Core. In this post I discuss how to intercept Response output by using a customized stream, modify the data and update the final output generated, effectively providing response filtering.
Back to Basics: Rewriting a URL in ASP.NET Core
March 13, 2020 - Maui, Hawaii
Sometimes in an application you need to take over the routing process with some custom processing that acts on an incoming URL and actually has to go to another URL. This can be a simple relinking task from old content to new, or it can be more complex where you access a specific URL on the public site that actually needs to be processed by another URL altogether.
Troubleshooting Windows Sleep Insomnia
March 02, 2020 - Maui, Hawaii
Windows long has had problems making machines stay in Sleep mode. In this post I describe some of the problems and likely solution by using `powercfg.exe` to hunt down and disable devices that can wake the computer from sleep.
Working with IWebHostEnvironment and IHostingEnvironment in dual targeted ASP.NET Core Projects
February 26, 2020 - Maui, Hawaii
In ASP.NET Core 3.x Microsoft introduced a new `IWebHostEnvironment` to replace the obsoleted `IHostingEnvironment`. While that works for top level applications this can cause some complications for multi-targeted libraries that need to support both .NET Core 2.x and 3.x. This post describes the problems and offers a few workarounds.
Null API Responses and HTTP 204 Results in ASP.NET Core
February 24, 2020 - Maui, Hawaii
ASP.NET Core's default API handlers return an HTTP 204 response for null value results. This is meant to be a convenience feature, but if your calling API depends on a proper JSON response or an HTTP 200 result code, it can cause applications to break. In this post I'll describe why this can be a problem and how you can return proper JSON results for null values.
Deleting Problem Folders and Files on Windows: Could not find this Item Error
February 10, 2020 - Maui, Hawaii
Ever have a problem not being able to delete a file or folder because the filename is invalid? You see it in Explorer, but you can't delete or move the file? Well I just ran into this issue and after some digging figured out that you use extended path syntax `\\?\` to get around some interesting naming and sizing issue with Windows path operations.
ASP.NET Core IIS InProcess Hosting Issue in .NET Core 3.1
January 14, 2020 - Maui, Hawaii
Ran into a nasty little issue with a hosted ASP.NET Core 3.1 application where InProcess hosting was not working. It turns out I hit a regression bug in 3.1 that causes InProcess hosting to fail if there are certain dependencies.
A HighlightJs Copy Code Badge Component
December 30, 2019 - Maui, Hawaii
In this post I describe a small, very specialized addon component for the HighlightJs Syntax highlighter that displays a badge that lets you copy the code snippet and displays the syntax language. The post covers how to use this simple component, and a look behind the scenes on how it works.
VSIX Installer Extension Manifest and Visual Studio Version Numbers
December 18, 2019 - Maui, Hawaii
Ran into a problem with updating a Visual Studio extension today where the VSIX installer first failed to install for the latest version of Visual Studio and then failed to enable the option to install for that same version. Turns out it was related to incorrectly specifying the right version number for VS 2019 and in this post I show how to use the correct (and somewhat unexpected) version syntax.
Creating Angular Synchronous and Asynchronous Validators for Template Validation
November 18, 2019 - Maui, Hawaii
Validations are a key feature of any business application and in Angular there's an infrastructure for building validators built in. A number of existing validators provide the basics but if you have custom business logic to process for validation you'll need to create custom Validators. In this post I describe how to create both sync and asycn Angular Validators for use in declarative forms.
FireFox, Windows Security and Kestrel on ASP.NET Core
November 14, 2019 - Maui, Hawaii
Ran into issues today with Windows Authentication and FireFox in a ASP.NET Core application where auth was working with all browsers **except** for FireFox. Firefox would just throw up endless sequences of login dialogs or in some cases just show the default ASP.NET Core 'UnAuthenticated' dialog. Here's what this looks like and how to work around it.
Dynamically Loading Assemblies at Runtime in RazorPages
November 05, 2019 - Maui, Hawaii
I've been working on some tools that create generic, standalone Web servers using ASP.NET Core, in various configurations. One of the versions I'm building also supports Razor Pages and while genericallly hosting Razor Pages out of a locally run folder, there are some complications that arise out of dynamic runtime compilation. In this post I look at how to dynamically load assemblies at runtime.
Windows Authentication and Account Caching on Web Browser Auto-Logins
October 19, 2019 - Maui, Hawaii
If you're working with Windows authentication to access Windows or Active Directory groups be aware that there's a gotcha with newly added groups when users are automatically logged into the Web browser.
Serving ASP.NET Core Web Content from External Folders
September 30, 2019 - Maui, Hawaii
ASP.NET Core makes it easy to create a new Web site, but by default the location of where the application runs and serves files from is pretty static and pinned to the startup folder of the application. In this post I discuss another usage scneario of building a generic local Web Server that can start serving files out of **any** folder.
Upgrading my AlbumViewer Sample Application to ASP.NET Core 3.0
September 24, 2019 - Maui, Hawaii
.NET Core 3.0 is here and in this post I describe the process of updating an existing ASP.NET Core Angular API application to this latest release. For the most part the update process is very smooth with a few configuration changes required, but there are also a few gotchas that have bitten me and I'll cover those here.
Open Internet Settings Dialog directly on Windows
September 10, 2019 - Maui, Hawaii
Windows is making it harder to find classic Control Panel windows and the Internet Settings dialog is no exception. The Networking options no longer have a link to it, so you have remember where to look for it. Here's a quick way to get to it.
Programmatically Opening Windows Terminal in a Specific Folder
September 03, 2019 - Maui, Hawaii
The new Windows Terminal provides many cool new features and much improved Terminal performance which makes it very desirable to use even in its current preview state. However, unfortunately the Terminal currently lacks a command line interface to control startup, do if you want to externally launch a shell some workarounds are required to get it to start out of a specific folder.
WPF Window Closing Errors
September 02, 2019 - Maui, Hawaii
I've recently had a large uptick of errors in my Markdown Monster logs that complain about `Cannot set Visibility to Visible or call Show, ShowDialog, Close, or WindowInteropHelper.EnsureHandle while a Window is closing`. This error can crop up with nested or parallel window closing operations, which might not always be obvious when they happen. I'll show some of the issues and the hacky by easy to implement work around.
Visual Studio 2019.2 and .NET 3.0 SDK Projects not Loading
August 21, 2019 - Maui, Hawaii
Recent upgrades to Visual Studio 2019.2 seem to have broken projects that use the 3.0 .NET SDK as Visual Studio is defaulting to a pre-3.0 version of the SDK tools and compilers. The end result is that projects even fail to load in Visual Studio. There are workarounds but ultimately this an issue that Microsoft needs to address better in future updates.
Uri.AbsoluteUri and UrlEncoding of Local File Urls
August 20, 2019 - Maui, Hawaii
Ran into an interesting problem with the Uri class and local file URLs today. The problem is that Urls were not properly Url encoding and decoding with the Url treated incorrectly. After a bit of experimenting it turns out that the way the file URL is created is critical to the Url parsing behavior of the Uri class.
Building a Live Reload Middleware Component for ASP.NET Core
June 03, 2019 - Maui, Hawaii
In my last way I showed how to use Live Reload in ASP.NET Server side applications using a tool called BrowserSync. In this post I replace BrowserSync's functionality with a custom Live Reload Middleware component for ASP.NET Core that's more efficient and doesn't require installing and running a separate tool. I'll show how Live Reload works, and how to implement the component in some detail.
Live Reloading Server And Client Side ASP.NET Core Apps with BrowserSync
May 18, 2019 - Maui, Hawaii
Accessing RouteData in an ASP.NET Core Controller Constructor
May 15, 2019 - Maui, Hawaii
Ran into a difficulty trying to get access to RouteData() generically outside of Controller code in ASP.NET Core. Specifically I needed to get at route data to pull out a tenant ID required to set up a DbContext with the right connection string to connect to. Getting the route data as part of the DI process in the Controller constructor proved to be challenging. In this post I describe the problem and the work around.
.NET Core 3.0 SDK Projects: Controlling Output Folders and Content
April 30, 2019 - Maui, Hawaii
I've been upgrading Markdown Monster to run on .NET Core 3.0 and one of the biggest changes is switching to the new .NET SDK style format for all projects. I ran into some issues with the Addin projects that require that output is placed in a very specific output folder and to not include output of all references. In this post describe a couple of ways to control where output goes and how to limit the output that goes to those folders.
First Steps in porting Markdown Monster WPF App to .NET Core 3.0
April 24, 2019 - Maui, Hawaii
I spent a good part of the day today getting Markdown Monster to run on .NET Core 3.0 and in this post I packaged up my notes into a lengthy post with how went through this process. It wasn't exactly quick to make this happen but MM has a few peculiarities that made this process a little bit more trying than it could have been. I'll summarize some thoughts at the end on both the process and the relevance of this process.
Adventures in .NET Core SDK Installation: Missing SDKs and 32 bit vs 64 bit
April 20, 2019 - Maui, Hawaii
Ran into a problem yesterday with a new installation of the .NET Core 3.0 Preview 4 installation. Installed the new preview and found that all of my .NET Core 2.x SDKs were no longer showing. A lot of back and forth later I found that I accidentally installed the wrong bitness SDK - 32 bit vs 64 bit. Here's a quick overview of how and why and why you probably NEVER want to install the 32 bit SDK.
Using the ng-BootStrap TypeAhead Control with Dynamic Data
April 08, 2019 - Maui, Hawaii
I recently swapped my Auto complete logic in an application to use ng-bootstrap's nice and relatively easy to use TypeAhead control and I ran into a small snag trying to figure out how to bind dynamic data retrieved from the server. The examples show local data binding but fail to show how to load and update the control with remote data. In this post I show how the control works both in sync and async mode and point out the simple solution that eluded my via the Observable switchMap operator.
Creating a custom HttpInterceptor to handle 'withCredentials' in Angular 6+
April 07, 2019 - Maui, Hawaii
Client HTTP requests often need to set a few common settings and you don't want to set them on every request. To make this process easier Angular provides an HttpInterceptor class that you can subclass and add custom behavior to for each HTTP request that is sent through the HttpClient. Here's a quick review on how to do this.
ASP.NET Core In Process Hosting on IIS with ASP.NET Core
March 16, 2019 - Maui, Hawaii
In version 2.2 ASP.NET Core adds support for direct in-process hosting which improves throughput considerably using an easy mechanism that allows switching between in-process and out-of-process hosting. In this post I describe how to use in process hosting and how it works.
Using .NET Standard with Full Framework .NET
February 19, 2019 - Maui, Hawaii
Using .NET Standard on full .NET Framework is a mixed bag because the behavior of .NET Standard differs depending on which version of the Runtime you are integrating with. In this post I review what .NET Standard is and how it fits in with the full .NET Framework and how you can use .NET Standard packages/assemblies in full framework along with some of the problems you have to watch out for.
WPF Hanging in Infinite Rendering Loop
February 14, 2019 - Maui, Hawaii
Ran into a nasty WPF bug this week with Markdown Monster that caused MM to hang during startup in certain scenarios. Several users reported issues that I could not duplicate until I started playing around with my screen resolution and scaling. An obscure but insidious WPF bug can cause an application to go into an infinite loop which effectively locks up the application's UI and the app overall. Here's more info on what the problem is and how to work around it.
Ad Blockers, Brave Browser and BrainTree Credit Card Processing SDKs
February 08, 2019 - Maui, Hawaii
Ran into an issue with my CC processing forms using Brave today. Brave is a Chromium based browser, but it includes built-in, on-by-default content blocking which apparently causes my order forms to not work as scripts and related page cookies aren't being loaded. Here's what happened and some thoughts on how to work around this.
Finding the ProgramFiles64 Folder in a 32 Bit App
February 05, 2019 - Maui, Hawaii
.NET has the `System.GetFolderPath()` method to let you easily retrieve various system folder in a safe way. Unfortunately getting the `Program Files` folder is a bit of problem due to some complications on how the name is retrieved on 32 bit systems. If you're running an application in 32 bit mode, or have an application that can run either 32 or 64 bit, make sure you use the right way to determine where Program Files is located.
COM Object Access and dynamic in .NET Core 2.x
January 22, 2019 - Maui, Hawaii
I was surprised to find out that COM Interop works in .NET Core when running on Windows. It's possible to access COM components via Reflection easily enough in .NET Core 2.x. Unfortunately use of the `dynamic` keyword does not work in .NET Core 2.x so for the moment COM interop is limited to using Reflection.
January 21, 2019 - Maui, Hawaii
A Visual Studio to Visual Studio Code Snippet Converter
January 14, 2019 - Maui, Hawaii
Visual Studio Code Snippets are very useful and a great productivity enhancing tool for templating reusable code blocks into the editor. I have tons of snippets I use all the time for great productivity savings. Over the last couple of years I've been increasingly using Visual Studio Code and JetBrains Rider and I found myself missing my nearly 150 code snippets from Visual Studio, so I created a small hacky utility to move code snippets from Visual Studio to VS Code and with more limited features to Rider.
Don't let ASP.NET Core Console Logging Slow your App down
December 31, 2018 - Maui, Hawaii
Today I ran into a self-inflicted problem with Console logging while playing with a toy test project. By accident I ran the application under load and Console Logging was on and performance was horrendous. In fact nearly 40x slower horrendous. Although my error, there are a few ways this can happen and it's important to understand that Console logging is very, very slow and in this post I show how this happened and why you want to be careful with Console logging in production.
Updating Westwind.AspnetCore.Markdown with Markdown from Files and URLs
December 20, 2018 - Maui, Hawaii
In the last week I've had a need to add some additional features to my Westwind.AspnetCore.Markdown library that provide easier access to Markdown from files and urls as well as the ability to replace the default Markdown parser in the library. In this post I'll discuss some of the feature additions including some implementation notes.
Returning an XML Encoded String in .NET
November 30, 2018 - Maui, Hawaii
XML is not as popular as it once was, but there's still a lot of XML based configuration and data floating around today. Today I ran into a recurring issue where I needed to convert a string to a properly encoded XML string. Seems simple enough but it's not as straightforward as you might think to generate an XML Encoded string properly. This post shows a few different ways to retrieve a string and discusses advantages of each.
Creating a .NET Global Tool from an existing Console Application
November 05, 2018 - Maui, Hawaii
.NET Core doesn't support creating executables directly, but it does have support for **Global Tools** which provide a mechanism to register a console application and make it easily accessible using a simple command line command rather than a complex `dotnet.exe` command.
Creating an HTML Packager
November 01, 2018 - Maui, Hawaii
Recently I needed to add the ability to save HTML documents in Markdown Monster. Saving raw rendered Markdown is not really sufficient and so I set out to create an HTML packager that can package an HTML Web endpoint into a self-contained local package either as a single self-contained file, or an HTML document with all dependencies localized. In this post I discuss why this is needed and how to implement and use this library to capture HTML output in a few different ways.
Slow Connections with Sql Server
October 26, 2018 - Maui, Hawaii
Ran into a problem with extremely slow SQL Server connections when connecting to the server. Connections would take 2 seconds or more even on repeat connections. It turns out the problem is related to missing TCP/IP protocol support which is disabled by default.
Tip: Open Visual Studio Code from Visual Studio as an External Tool
October 06, 2018 - Maui, Hawaii
I use both Visual Studio and Visual Studio Code in my development. Although I tend to still default to the full version of Visual Studio, I tend to run Visual Studio Code side by side with Visual Studio and flip back and forth a lot. To make things a little easier and being able to jump directly to a document in VS Code from full VS you can create an External Tool entry and a shortcut mapping to quickly open documents and/or folders in VS Code.
Getting around Chrome POST XSS Protection
September 22, 2018 - Maui, Hawaii
Ran into an unusual issue where Chrome is blocking user input from a TextArea that includes HTML form and input control input - on the client side. While I'm familiar with server side input validation, this is client side validation that causes the response to be rejected. Here's more info on the error and how to get around it when necessary.
Markdown and Cross Site Scripting
August 31, 2018 - Hood River, Oregon
I've been getting a number of requests for providing XSS support in my various Markdown components. While Markdown itself makes no provision for HTML Sanitation, if you use Markdown for capturing user input some sort of sanitation is required to avoid potential XSS attacks. In this post I look at XSS scenarios and show how the `Westwind.AspnetCore.Markdown` package deals with removing script tags from rendered Markdown content.
Fixing Visual Studio Intellisense Errors
August 07, 2018 - Hood River, Oregon
I ran into a problem in one of my applications where Visual Studio was showing errors that were clearly not actual errors. A new feature in Visual Studio now shows separate error listings for Build and IntelliSense errors and it turns out the errors are Intellisense errors. Here's how to fix them and get Visual Studio back onto the straight and narrow.
Web Assembly and Blazor: Re-assembling the Web
July 31, 2018 - Hood River, Oregon
Creating a WPF ItemSource Length Filter Converter
June 23, 2018 - Hood River, Oregon
In this short post I show you you can create a simple Value Converter to limit the max number of items in an ItemsSource value binding in WPF.
Explicitly Ignoring Exceptions in C#
June 16, 2018 - Hood River, Oregon
In most applications I have a few places where I explicitly need to ignore errors. While generally this isn't a good idea, under some circumstances you just don't care if an error occurs or you simply want a yay or nay response. In this stupid pet tricks post, I describe a few scenarios where not catching any exceptions makes sense along with a couple of helper methods that make these scenarios more explicit so code analyzer and book thrower reviewers can be quieted down.
Which .NET Core Runtime Download do you need?
June 05, 2018 - Hood River, Oregon
.NET Core has a number of different runtime downloads that you can grab to install. The combinations of downloads can be a bit confusing and it depends on whether you install a development or runtime environment. In this post I describe what each download contains and what you should use it for.
Web Code is a solved Problem: How about fixing Web UI next?
May 31, 2018 - Hood River, Oregon
Updating my AlbumViewer to ASP.NET Core 2.1 and Angular 6.0
May 09, 2018 - Hood River, Oregon
Took some time to upgrade my AlbumViewer application to ASP.NET Core 2.1 RC and Angular 6.0. The .NET Core update was very smooth with only very minor adjustments required showing that Microsoft has smoothed out the update path significantly from the frenetic pace of past versions. The Angular update was a bit more involved primarily due to the changes in rxJS.
Creating a generic Markdown Page Handler using ASP.NET Core Middleware
April 18, 2018 - Maui, Hawaii
I've been talking about Markdown a lot in recent blog posts and this time I'll cover a generic Markdown page handler that you just drop into any site to handle semi-static page editing more easily with Markdown from within an ASP.NET Core application. While Markdown is common fare in CMS or blog applications, it's not so apparent how to get similar generic Markdown document rendering within the context of an existing application. The middleware I describe here allows you to simply drop a markdown file into a configured folder and have it rendered into a stock template. Simple but very useful.
Getting the .NET Core Runtime Version in a Running Application
April 12, 2018 - Maui, Hawaii
Microsoft has a long history of not providing a reasonable way of looking up the version of the runtime that is hosting your applications. .NET Core is no different and in this short post I show one way you can capture a descriptive name of the runtime executing that's suitable for displaying in your application's info page.
Creating an ASP.NET Core Markdown TagHelper and Parser
March 23, 2018 - Maui, Hawaii
A couple of months ago I wrote about creating a WebForms based Markdown control. This time around I'll build an ASP.NET Core MVC TagHelper that performs similar functionality for embedding Markdown text into a content area of a Razor page. The component also includes easy access to a Markdown parser using the blazing fast MarkDig Markdown parser.