CODEWITHSUNDEEP
c#.net.net-core.net-framework-version
Baala Srinivas K
Baala Srinivas K

Reputation: 389

Unable to resolve System.Windows.Forms.dll in .Net Core 3.1

I have a scenario where we are using a legacy .Net Framework dll in .Net core 3.1 class library. Internally .Net Framework dll is using System.Windows.Forms.dll which .Net core is not able to resolve.

I am getting below error message during runtime

Could not load file or assembly 'System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'. The system cannot find the file specified.

In a ideal world there is no point in adding System.Windows.Forms.dll to a class library but is there any way to add System.Windows.Forms and its dependencies in .Net core class library.

Note: I have tried manually adding System.Windows.Forms.dll but it did not work out.

Upvotes: 8

Views: 13928

Answers (2)

Hosam.Yousof
Hosam.Yousof

Reputation: 117

It works with me in .net core 3.1 by adding <UseWindowsForms>True</UseWindowsForms> inside project .csproj file to become like this:

<PropertyGroup>
    <TargetFramework>netcoreapp3.1</TargetFramework>
    <UseWindowsForms>True</UseWindowsForms>
</PropertyGroup>

Upvotes: 1

Baala Srinivas K
Baala Srinivas K

Reputation: 389

I got the resolution, we can achieve this by framework reference.

<FrameworkReference Include="Microsoft.WindowsDesktop.App" />

For more details please refer https://natemcmaster.com/blog/2019/01/09/netcore-primitives-3/

Upvotes: 19

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