我正在寻找一种方法来将列表中的不同代表分配给MethodInfo
's 而无需事先了解有关返回类型的信息。下面是我正在使用的代码。评论提供了有关正在发生的事情的更多信息。这是一段很长的代码,但我已经尽可能地减少了它。
主要片段
private const string methodName = "Execute";
public static void Main()
{
ExampleClass1 e1 = new ExampleClass1();
ExampleClass2 e2 = new ExampleClass2();
ExampleClass3 e3 = new ExampleClass3();
/* Code below Simulates: "e3.GetString = e2.Execute;" */
var method = e2.GetType().GetMethod(methodName);
for (int i = 0; i < e3.DelegateList.Count; i++)
{
// First check the type of e2 return
Type methodType = method.ReturnType;
// Check that its the same return type as delegate
if (methodType != e3.DelegateList[i].ReturnType)
continue;
// Assign delegate to method
var returnType = e3.DelegateList[i].DelegateType;
e3.DelegateList[i].Delegate = Delegate.CreateDelegate(returnType, e2, method);
/* Code below only for debugging */
Console.WriteLine("The delegate in the list: " + e3.DelegateList[i].Delegate);// Returns Type of StringHandler
Console.WriteLine("The delegate in the object: " + e3.GetString);// Returns null
e3.GetString = e3.DelegateList[i].Delegate;// This throws Error Cannot convert Delegate to StringHandler
}
/* Code above Simulates: "e3.GetString = e2.Execute;" */
e2.GetNumber = e1.Execute;
e3.Execute();// Throws Null References Exception on
// Read the key
Console.ReadKey();
}
支持类/代码
如果您需要有关支持类的更多信息,请参阅下面的代码。此外,这是一个独立的程序,应该可以按原样运行。
public class ExampleClass3
{
public delegate string StringHandler();
public delegate int IntHandler();
public StringHandler GetString { get; set; }
public IntHandler GetInt { get; set; }
public List<DelegateInfo<Type, Type, Delegate>> DelegateList { get; set; }
public ExampleClass3()
{
DelegateList = new List<DelegateInfo<Type, Type, Delegate>>();
DelegateList.Add(new DelegateInfo<Type, Type, Delegate>(typeof(StringHandler), typeof(string), GetString));
DelegateList.Add(new DelegateInfo<Type, Type, Delegate>(typeof(IntHandler), typeof(int), GetInt));
}
public object Execute()
{
Console.WriteLine(GetString());
return null;
}
}
public class ExampleClass2
{
public delegate int NumberHandler();
public NumberHandler GetNumber { get; set; }
public string Execute() => $"Your Number Is {GetNumber()}";
}
public class ExampleClass1
{
public int number = 5;
public int Execute() => number;
}
public class DelegateInfo<T1, T2, T3>
{
public DelegateInfo(T1 delegateType, T2 returnType, T3 @delegate)
{
DelegateType = delegateType;
ReturnType = returnType;
Delegate = @delegate;
}
public T1 DelegateType { get; set; }
public T2 ReturnType { get; set; }
public T3 Delegate { get; set; }
}