topic Re: Compilation error with basic project in .NET Maps SDK Questions

Compilation error with basic project

ModyBuchbinder — Tue, 25 Nov 2025 06:18:22 GMT

I just started to use 200.8

I have VS 17.8

Started a project with the template and just compile it (no changes)

I get the error:

Severity Code Description Project File Line Suppression State
Error MC1000 Unknown build error, 'Could not find type 'WinRT.WinRTRuntimeClassNameAttribute' in assembly 'C:\Users\mody\.nuget\packages\microsoft.windows.sdk.net.ref\10.0.19041.31\lib\net6.0\WinRT.Runtime.dll'. Line 14 Position 23.' WpfMapApp1 C:\Projects\WpfMapApp1\WpfMapApp1\MainWindow.xaml 14

As far as I understand I have everything installed.

Any idea?

Re: Compilation error with basic project

GKmieliauskas — Tue, 25 Nov 2025 06:49:39 GMT

Hi,

As I understand it, your project template is WPF application. Requirements for WPF application are:

Development environments

Visual Studio 2022 17.8 or higher with the .NET desktop development workload.
Visual Studio 2019 16.9 or higher (for .NET Framework applications only).

.NET SDKs and frameworks

.NET 8 (8.0.404 or higher) is required for developing WPF for .NET applications.
.NET Framework 4.7.2 or higher is required for developing .NET Framework applications.

From error message I see that your .NET SDK is 6.0. What .NET version did you choose when create new project from template? Do you have the same .NET SDK (8.x or 9.x) installed? Run "dotnet sdk check" from Developer Powershell to see.

Re: Compilation error with basic project

ModyBuchbinder — Tue, 25 Nov 2025 08:46:02 GMT

Thanks for the quick response.

See my screen shot, it looks like I have all the versions.

I do not see anywhere an option to select .NET version when I create a new project. I select the template from the list and get my project. When I edit the project file I see the line:

<TargetFramework>net8.0-windows10.0.19041.0</TargetFramework>

Thanks again

Re: Compilation error with basic project

ModyBuchbinder — Tue, 25 Nov 2025 08:51:46 GMT

Checking my dependencies in the project and Frameworks you can see the the two lines under SDK.NET.Ref point to NET 6

All entries in the NETCore and App.WPF are pointing to NET 8

Re: Compilation error with basic project

GKmieliauskas — Tue, 25 Nov 2025 11:36:39 GMT

After creating project, you can find .NET version in project properties:

You can select .NET version in next step after choosing project template, selecting location for project:

Another one thing is Visual Studio version. I have found: Visual Studio 2022 v17.12 with .NET 9

Re: Compilation error with basic project

ModyBuchbinder — Tue, 25 Nov 2025 12:46:20 GMT

Upgrade to VS2022 17.14 solved the problem.

The docs say 17.8 is supported (that is what I had before upgrade).

Many thanks

Re: Compilation error with basic project

dotMorten_esri — Mon, 01 Dec 2025 16:56:42 GMT

Thanks for pointing out this error in our doc. The correct minimum is 17.12. I'll make sure that gets fixed.