数学.dll
namespace math
{
public class MyClass {
public static int Add(int x, int y)
{
return x+y;
}
}
在我的 exe 项目中，我想使用 Add() 函数，
示例 1 - 这是有效的
public void Example_1()
{
SampleAssembly = Assembly.Load("math");
Type type = SampleAssembly.GetType("math.MyClass");
MethodInfo methodInfo = type.GetMethod("Add");
if(methodInfo != null)
{
object result = null;
ParameterInfo[] parameters = methodInfo.GetParameters();
object classInstance = Activator.CreateInstance(type, null);
object[] parametersArray = new object[] { 3, 5 };
result = methodInfo.Invoke(classInstance, parametersArray);
MessageBox.Show(result.ToString());
}
}
示例 2 - 这不起作用
public delegate int Add(int x,int y);
public void Example_2()
{
SampleAssembly = Assembly.Load("math");
Type type = SampleAssembly.GetType("math.MyClass");
MethodInfo methodInfo = type.GetMethod("Add");
if(methodInfo != null)
{
Add add = (Add)Marshal.GetDelegateForFunctionPointer
(methodInfo.MethodHandle.GetFunctionPointer(),typeof(Add));
MessageBox.Show(add(3,2).ToString());
}
}
示例 3 - 这不起作用
public void Example_3() {
IntPtr hdl = LoadLibrary("math.dll");
IntPtr addr = GetProcAddress(hdl,"MyClass");
IntPtr myfunction = GetProcAddress(addr,"Add");
Add add= (Add)Marshal.GetDelegateForFunctionPointer(hdl,typeof(Add));
MessageBox.Show(add(2,3).ToString());
}
你能告诉我不工作的例子（2,3）的错误在哪里吗？谢谢。