当属性类型未知时，为通过反射获取的属性访问器创建委托

发布于 2024-12-02 04:52:25 字数 454 浏览 1 评论 0原文

在 .NET 2.0（使用 C# 3.0）中，当我在编译时不知道其类型时，如何为通过反射获取的属性访问器创建委托？

例如，如果我有 int 类型的属性，我可以这样做：

Func<int> getter = (Func<int>)Delegate.CreateDelegate(
    typeof(Func<int>),
    this, property.GetGetMethod(true));
Action<int> setter = (Action<int>)Delegate.CreateDelegate(
    typeof(Action<int>),
    this, property.GetSetMethod(true));

但是如果我在编译时不知道该属性是什么类型，我不知道该怎么做。

原文

In .NET 2.0 (with C# 3.0), how can I create a delegate for a property accessor obtained via reflection when I don't know its type at compile time?

E.g. if I have property of type int, I can do this:

Func<int> getter = (Func<int>)Delegate.CreateDelegate(
    typeof(Func<int>),
    this, property.GetGetMethod(true));
Action<int> setter = (Action<int>)Delegate.CreateDelegate(
    typeof(Action<int>),
    this, property.GetSetMethod(true));

but if I do not know what type the property is at compile time, I don't know how to do it.

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梦萦几度 2024-12-09 04:52:25

您需要的是：

Delegate getter = Delegate.CreateDelegate(
    typeof(Func<>).MakeGenericType(property.PropertyType), this,
    property.GetGetMethod(true));
Delegate setter = Delegate.CreateDelegate(
    typeof(Action<>).MakeGenericType(property.PropertyType), this,
    property.GetSetMethod(true));

但是，如果您这样做是为了提高性能，那么您仍然会遇到不足，因为您需要使用 DynamicInvoke()，这慢。您可能想看看元编程来编写一个接受/返回对象的包装器。或者查看 HyperDescriptor，它可以为您完成此操作。

What you need is:

Delegate getter = Delegate.CreateDelegate(
    typeof(Func<>).MakeGenericType(property.PropertyType), this,
    property.GetGetMethod(true));
Delegate setter = Delegate.CreateDelegate(
    typeof(Action<>).MakeGenericType(property.PropertyType), this,
    property.GetSetMethod(true));

however, if you are doing this for performance, you are still going to come up short, since you would need to use DynamicInvoke(), which is slooow. You might want to look at meta-programming to write a wrapper that takes/returns object. Or look at HyperDescriptor which does this for you.

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