04
JAN
Microsoft MVP for Azure
.NET
27
DEC
Dependency Injection with Multiple Implementations in ASP.NET Core
The built-in Dependency Injection (DI) in ASP.NET Core is very useful, but how do you deal with an interface has multiple implementations? Can the runtime choose one of these implementations based on configuration? Is there a way to get rid of reflection? Let me show you how to dynamically select a specific implementation of an interface at run time according to the configuration file without …
26
DEC
Path Caveat with ASP.NET Core 2.2 IIS Hosting
ASP.NET Core 2.2 has been in place for some time, with a new feature that can use the new AspNetCoreModuleV2 and deploy with InProcess mode on IIS to dramatically improve performance. These days Azure App Service finally completed the deployment of this new version of the module, I configured my blog to the new module, and it exploded in production. Let's see why and how to solve it. If you don't …
13
DEC
Build .NET Core 2.2 Projects on Azure DevOps
.NET Core 2.2 has been release for couple of weeks. However, the build pipeline is still failing these days. Microsoft has not installed .NET Core 2.2 SDK to the hosted VS2017 agents yet. Let's see how to work around this issue and have a success build for our .NET Core 2.2 apps. 1. Add Task Edit your build definition, and click the "+" button to add a new task. 2. Add .NET Core SDK Installer …
25
NOV
.NET Core WebUtility.UrlEncode or HttpUtility.UrlEncode
When we are dealing with URL encode in .NET Core 2.1, there are two APIs: System.Net.WebUtility.UrlEncode and System.Web.HttpUtility.UrlEncode. What's the difference between them? And which one should we prefer to use? I have done some research today, here's my findings. 1. Test Results First, let's see some tests. I've tested 2 couples of the same method between WebUtility class and HttpUtility …
31
OCT
Migrating Old ASP.NET Applications to .NET Core
More and more people are talking about .NET Core these days. It is true that .NET Core is the future, and .NET Framework will still be maintained because very large number of applications can’t be migrated in a short time. .NET Core and .NET Framework are just like electric cars and gasoline powered cars. Gasoline cars is mature, and you can drive it without any problem, but electric cars have …
13
OCT
Generate Captcha Code in ASP.NET Core
If you want to use captcha code to protect your website from spam messages, there are a few options such as Google ReCaptcha and captcha.com. Both of them can be integrated into ASP.NET Core applications. However, you may still want to generate the captcha code yourself for some reason, such as your website may be used in mainland China... This post will show you how to generate and use captcha …
12
OCT
Add Watermark to Uploaded Image in ASP.NET Core
Adding watermark to an image is very widely used in websites in order to protect the content owner's copyright, such as a blog system like this website. In traditional ASP.NET (.NET Framework), we could use System.Web.Helpers.WebImage to add text watermark like this: var image = new WebImage(imageBytes); image.AddTextWatermark( Settings.Instance.WatermarkText, "White", Settings.Instance. …
27
SEP
Get App Version in .NET Core
We can define versions on our .NET Core applications, but how to get the version at runtime? There are several ways to do it. First, let's see a typical .NET Core project file with versioning. We can define the version numbers for AssemblyVersion, FileVersion and Version in the project file (.csproj). The AssemblyVersion and FileVersion attributes must be in format of "major[.minor[.build[. …
18
SEP