如何通过反射调用接受 Func<> 参数的方法？

Question

When I try to add the Func<> parameter in the array of MethodInfo.Invoke , it's giving me the error that it can't convert a method group to an object.

How do I deal with this?

The method's signature:

static bool Something(Func<Expression, Expression, BinaryExpression> body)

What I'm passing:

MethodInfo.Invoke(null, new object[] { Expression.Subtract }); // compilation error

CS0428 Cannot convert method group 'Subtract' to non-delegate type 'object'. Did you intend to invoke the method?

Answer 1

There is indeed no conversion from method groups to object , but there are conversions from method groups to compatible delegate types ( method group conversions ), and there are also conversions from delegate types to object . So you can first convert the method group to Func<Expression, Expression, BinaryExpression> with a cast, then it can be implicitly converted to object :

someMethodInfo.Invoke(null, new object[] { (Func<Expression, Expression, BinaryExpression>)Expression.Subtract });