我有一个下拉列表,它是通过检查类的方法并包括与特定签名匹配的方法来填充的。问题在于从列表中获取所选项目并让委托(delegate)在类中调用该方法。第一种方法有效,但我无法弄清楚第二种方法的一部分。
例如,
public delegate void MyDelegate(MyState state);
public static MyDelegate GetMyDelegateFromString(string methodName)
{
switch (methodName)
{
case "CallMethodOne":
return MyFunctionsClass.CallMethodOne;
case "CallMethodTwo":
return MyFunctionsClass.CallMethodTwo;
default:
return MyFunctionsClass.CallMethodOne;
}
}
public static MyDelegate GetMyDelegateFromStringReflection(string methodName)
{
MyDelegate function = MyFunctionsClass.CallMethodOne;
Type inf = typeof(MyFunctionsClass);
foreach (var method in inf.GetMethods())
{
if (method.Name == methodName)
{
//function = method;
//how do I get the function to call?
}
}
return function;
}
如何让第二种方法的注释部分生效?如何将 MethodInfo
转换为委托(delegate)?
谢谢!
编辑:这是有效的解决方案。
public static MyDelegate GetMyDelegateFromStringReflection(string methodName)
{
MyDelegate function = MyFunctionsClass.CallMethodOne;
Type inf = typeof(MyFunctionsClass);
foreach (var method in inf.GetMethods())
{
if (method.Name == methodName)
{
function = (MyDelegate)Delegate.CreateDelegate(typeof(MyDelegate), method);
}
}
return function;
}
最佳答案
public static Delegate CreateDelegate(this MethodInfo methodInfo, object target) {
Func<Type[], Type> getType;
var isAction = methodInfo.ReturnType.Equals((typeof(void)));
var types = methodInfo.GetParameters().Select(p => p.ParameterType);
if (isAction) {
getType = Expression.GetActionType;
}
else {
getType = Expression.GetFuncType;
types = types.Concat(new[] { methodInfo.ReturnType });
}
if (methodInfo.IsStatic) {
return Delegate.CreateDelegate(getType(types.ToArray()), methodInfo);
}
return Delegate.CreateDelegate(getType(types.ToArray()), target, methodInfo.Name);
}
关于c# - 从 methodinfo 获取委托(delegate),我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/940675/