ConfigurationBinder source generator should not generate source for types without members

[ericstj]

If a type contains no members for binding we shouldn't generator source for that. This includes the case where the only members it generates are references to itself.

Consider the following types:

public abstract class MySingleton
{
    public static MySingleton Instance {get; set;}
}

public abstract class MyNode
{
  public MyNode Next { get; set; }
}

public class MyClass
{
   // all members below are excluded
  public int[,] Matrix { get; set; }
  public Func<string, int> ParseMethod { get; set; }
}

All have no bindable members and result in useless code gen today. It's harmless - but we should try to identify these types of things through heuristics to reduce the size of the codegen. We should inform the behavior for non-abstract instance types from the runtime binder to determine if they'll be initialized or not in these cases -- I don't think they would.

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Issue Details

---

If a type contains no members for binding we shouldn't generator source for that. This includes the case where the only members it generates are references to itself.

Consider the following types:

public abstract class MySingleton
{
    public static MySingleton Instance {get; set;}
}

public abstract class MyNode
{
  public MyNode Next { get; set; }
}

public class MyClass
{
   // all members below are excluded
  public int[,] Matrix { get; set; }
  public Func<string, int> ParseMethod { get; set; }
}

All have no bindable members and result in useless code gen today. It's harmless - but we should try to identify these types of things through heuristics to reduce the size of the codegen. We should inform the behavior for non-abstract instance types from the runtime binder to determine if they'll be initialized or not in these cases -- I don't think they would.

Author:	ericstj
Assignees:	-
Labels:	untriaged, area-Extensions-Configuration, source-generator
Milestone:	-

[tarekgh]

The PR #94438 should address the third case

public class MyClass
{
   // all members below are excluded
  public int[,] Matrix { get; set; }
  public Func<string, int> ParseMethod { get; set; }
}