Why not remove delegate BeginInvoke method, since it is not platform supported on .NET 5?

[zhyy2008z]

Why reserve the delegate BeginInvoke method? Is anyone can help?

Related issues:
dotnet/runtime#47510
dotnet/runtime#16312

[ygra]

Roslyn can be used to compile programs for .NET Framework, right?

[zhyy2008z]

Can it be judged based on the target?

[huoyaoyuan]

Roslyn doesn't change its behavior based on the target. It only fails if the target doesn't contains required special types.

[jnm2]

@huoyaoyuan It does fail based on target framework when you use DIMs.

[huoyaoyuan]

@jnm2 It fails because it can't find the special member of DIM feature. It doesn't have more knowledge to the framework.

[jnm2]

What member is that?
Also, the same style of metadata detection could work for this proposal.

[huoyaoyuan]

System.Runtime.CompilerServices.CovariantReturnsOfClasses, the constant

[huoyaoyuan]

While, it does change behavior for attribute specified, for example SkipLocalsInitAttribute. There can be an attribute to adjust delegate compilation.

[zhyy2008z]

Manually specified or can be specified by target? If can be specified by target, may be this issue can be solved.

[huoyaoyuan]

Generally, the team won't doing removal automatically to avoid breaking people without knowledge. The can obsolete them.

[zhyy2008z]

Obsolete first, then remove it after years.