.NET 8 - C#12 - preview try interceptors

Question

I would like to try the new C# 12 preview function Interceptors but can't seem to get them to work.

The page says

Preview feature Introduced in Visual Studio 17.7, preview 3.

So I tried using Jetbrains Rider. Because I have seen Nick Chapsas Youtube video

My project file looks like this:

<Project Sdk="Microsoft.NET.Sdk">
    <PropertyGroup>
        <OutputType>Exe</OutputType>
        <TargetFramework>net8.0</TargetFramework>
        <ImplicitUsings>enable</ImplicitUsings>
        <Nullable>enable</Nullable>
        <LangVersion>preview</LangVersion>
        <Features>InterceptorsPreview</Features>
    </PropertyGroup>
</Project>

I used the sample code from this page

I have looked at the Youtube video some more and saw that the InterceptsLocationAttribute was in one of his helper files so I tried adding the code for that attribute to my code project.

Than the code compiles bus still not works. The code execution did not jump to the interception code.

you need to use install the JetBrains Rider. preview version — Vivek Nuna, Jul 08 '23 at 06:52
That does not seem to work, i tried `2023.2 EAP7 build 232.8453.124` and then watched the video back, he seams to use the normal version — Connor Stoop, Jul 08 '23 at 07:04
@VivekNuna Visual Studio 17.7, preview 3 is not released yet so i just tried using preview 2 but i get the same result — Connor Stoop, Jul 08 '23 at 07:56

score 2 · Accepted Answer · edited Aug 02 '23 at 01:38

2

Update: Now that Visual Studio 17.7, preview 3 has been released, it works as intended in visual studio preview

I got it working the changes are already in the main branch of https://github.com/dotnet/roslyn so by building that locally i can start a new version of visual studio and run the code in that. That makes it work, so I think Nick did the same.

edited Aug 02 '23 at 01:38

tymtam

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answered Jul 08 '23 at 13:06

Connor Stoop

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There is a package being developed to use to use this feature to mock code in test: https://github.com/demonicmetalcs/IntercepTest – Connor Stoop Jul 25 '23 at 07:23

score 0 · Answer 2 · answered Jul 31 '23 at 03:38

Yes, [InterceptsLocation] attribute was not recognized by C#12 compiler as it's missing in System.Runtime.CompilerServices currently.

Although it's in proposal for C#12 but somehow not available in System.Runtime.CompilerServices as of now. We need to add it in System.Runtime.CompilerServices namespace and then it works as expected.

Came across one Youtube Channel "Learn N Njoy" where it was discussed and explained. Here's the link:

https://www.youtube.com/watch?v=u-BtY5QugbQ

.NET 8 - C#12 - preview try interceptors

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