c# - 有没有办法从 Func 转换功能?

Question

我有一个Func<T, string>我想转换为Func<dynamic, string>. 可能吗？

Answer 1

干得好。当您的动态值不是 type 时，只需要决定您想要做什么T：

public Func<dynamic, string> ConvertToDynamicFunc<T>(Func<T, string> typedFunc)
{
    Func<dynamic, string> dynamicFunc = (input) =>
    {
        if (input is T)
            return typedFunc((T)input);

        return null; //or throw?
    };

    return dynamicFunc;
}

Func<int, string> typedFunc = (input) => input.ToString();
Func<dynamic, string> dynamicFunc = ConvertToDynamicFunc(typedFunc);
System.Console.WriteLine(dynamicFunc(10));//outputs "10";
System.Console.WriteLine(dynamicFunc(10.5));//outputs null since a double isn't an int (type T) or throw if you prefer;

Answer 2

当然：

Func<T, string> input = ...
Func<dynamic, string> output = x => input(x);

当然，如果你使用不兼容的类型执行委托，你会得到一个RuntimeBinderException.