System.Drawing support with lambda container images

Question

I was trying to add System.Drawing library inside a lambda function using container image. Followed the AWS documentation here

Added

RUN yum install -y amazon-linux-extras 
RUN amazon-linux-extras install epel -y
RUN yum install -y libgdiplus  

Inside the Dockerfile.

while calling the lambda i am getting an error

System.TypeInitializationException: The type initializer for 'Gdip' threw an exception. System.PlatformNotSupportedException: System.Drawing.Common is not supported on non-Windows platforms. See https://aka.ms/systemdrawingnonwindows for more information.

Answer 1

The issue was with the version of System.Drawing.Common package I am using. I've downgraded the package from 6.0.0 to 4.7.0 and the error went away.

Answer 2

You don't need to downgrade the package from v6.0.0. In .NET 6 you can fix the issue by adding this line to your startup code (before calling any GDI-dependent code):

AppContext.SetSwitch("System.Drawing.EnableUnixSupport", true);

But please note that this will not work in v7.0.0 and above. Unix support has already been removed from the 7.0.0-preview.* versions.