System.Drawing.ImageConverter raise the System.PlatformNotSupportedException on Linux

[alepikhov]

dotnet --version
3.1.100
nuget packeges:

• System.Drawing.Common 4.7.0
• System.Configuration.ConfigurationManager 4.7.0
  OS: Linux

Steps to reproduce:
Environment: Linux with dotnet 3.1.100

1. dotnet new console
2. dotnet add package System.Drawing.Common
   Installed version: 4.7.0
3. modify Program.cs file
   add new lines:
   var converter = System.ComponentModel.TypeDescriptor.GetConverter(typeof(System.Drawing.Image)); Console.WriteLine($"{converter?.GetType()}");
4. dotnet run
   Console output:

"System.ComponentModel.TypeConverter"

5. dotnet add package System.Configuration.ConfigurationManager
   Installed version: 4.7.0
6. dotnet run
   Console output:

Unhandled exception. System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation.
---> System.PlatformNotSupportedException: System.Windows.Extensions types are not supported on this platform.
at System.Drawing.ImageConverter..ctor()
--- End of inner exception stack trace ---
at System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean wrapExceptions, Boolean& canBeCached, RuntimeMethodHandleInternal& ctor, Boolean& hasNoDefaultCtor)
at System.RuntimeType.CreateInstanceDefaultCtorSlow(Boolean publicOnly, Boolean wrapExceptions, Boolean fillCache)
at System.RuntimeType.CreateInstanceDefaultCtor(Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache, Boolean wrapExceptions)
at System.Activator.CreateInstance(Type type, Boolean nonPublic, Boolean wrapExceptions)
at System.Activator.CreateInstance(Type type)
at System.ComponentModel.ReflectTypeDescriptionProvider.CreateInstance(Type objectType, Type callingType)
at System.ComponentModel.ReflectTypeDescriptionProvider.ReflectedTypeData.GetConverter(Object instance)
at System.ComponentModel.TypeDescriptor.TypeDescriptionNode.DefaultTypeDescriptor.System.ComponentModel.ICustomTypeDescriptor.GetConverter()
at System.ComponentModel.TypeDescriptor.GetConverter(Type type)

[danmoseley]

@ericstj was most recently thinking about type converters

[djarvis]

Have there been any insights with this issue? I'm stuck. It all worked with .NET Core 2.2 and System.Drawing.Common, 4.5.0.

[ericstj]

It all worked with .NET Core 2.2 and System.Drawing.Common, 4.5.0.

So in 2.2 there was no TypeConverter registered, so you'd get a default TypeConverter that can't convert anything.

In 3.0 ImageConverter was added in System.Windows.Extensions. That library isn't supported on linux today, so it throws. dotnet/corefx#33092 /cc @safern

To restore the 2.x behavior, you can apply a TypeConverter attribute to roll it back to the default (or even, if you wanted, implement your own ImageConverter).

TypeDescriptor.AddAttributes(typeof(System.Drawing.Image), new TypeConverterAttribute(typeof(TypeConverter)));

We should consider this another ref-count on https://github.com/dotnet/corefx/issues/36949

[djarvis]

Ok cool. My particular set of conflicting packages is between system.drawing.common and
Microsoft.AspNetCore.SpaServices.Extensions but I'm gathering it's the same issue. Thanks!

[ericstj]

We should just bring the TypeConverters for System.Drawing into System.Drawing.Common (out of System.Windows.Extensions). I believe these are sufficiently decoupled from the pure drawing usage (attribute + seperate types) to avoid bringing TypeConverter into the working set of an application that only uses drawing types.