问题描述
我如何可以创建一个只知道在运行时？类型的一个代表。
How can I create a Delegate with types only known at run time ?
我要做到以下几点：
Type type1 = someObject.getType();
Type type2 = someOtherObject.getType();
var getter = (Func<type1, type2>)Delegate.CreateDelegate(
typeof(Func<,>).MakeGenericType(type1, type2), someMethodInfo);
我如何能实现类似的东西？
How can I achieve something similar ?
推荐答案
我怀疑你想要的因为这样做的一个简单的方法你的typeof（...）。MakeGenericType 操作。
I suspect you want Expression.GetFuncType as a simpler way of doing your typeof(...).MakeGenericType operation.
var delegateType = Expression.GetFuncType(type1, type2);
Delegate getter = Delegate.CreateDelegate(delegateType, someMethodInfo);
您不能拥有的编译时间的类型的getter 这比代表更具体的虽然，因为你根本不知道该类型在编译时。您可能会使用动态不过，这将使它更容易地调用委托：
You can't have a compile-time type for getter that's more specific than Delegate though, because you simply don't know that type at compile-time. You could potentially use dynamic though, which would make it easier to invoke the delegate:
dynamic getter = ...;
var result = getter(input);
正如评论指出的那样，你的可以的强制转换为 MulticastDelegate ，但它实际上并不买你任何事情。
As noted in comments, you could cast to MulticastDelegate, but it wouldn't actually buy you anything.
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