使用Activator.CreateInstance创建功能 <T> 实例

Question

Does anybody know how to dynamically create a Func<T> instance?

//Create the Func type

Type funcType = typeof(Func<>).MakeGenericType(typeof(string)); 

//How do I pass a reference to the anonymous method? 

Activator.CreateInstance(funcType, () => "test");

This does not compile:

Cannot convert lambda expression to type object[] because it is not a delegate type

Anyone?

Answer 1

You need to use Expression trees:

var func = Expression.Lambda(Expression.Constant("test")).Compile();
var result = func.DynamicInvoke();

Answer 2

I don't think you can. This blog goes some way to explaining the issue. I suggest you look for an alternative approach. Can you use expression trees instead?

Answer 3

You need a object which can be converted into System.Object , for this you need to create a delegate like Func<String> first. So it makes no sence for me to create the Func<T> at runtime.