C#傳遞自訂結構體

利用WINDOWS訊息迴圈的機制傳遞自訂的結構體在編程的過程中可能經常會用到，在這裡我就編寫了一個簡單的結構體的傳遞代碼，需要注意的是類是不能夠傳遞的，能進行傳遞的只能是結構體

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;

namespace CustomTest
{
    public struct Student
    {
        public string name ;
        public string id;
    }

    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private const int WM_USERMSG = 0x0400 + 1;

        [DllImport("User32.dll", EntryPoint = "SendMessage")]

        private static extern int SendMessage(

               IntPtr hWnd,　　　// handle to destination window

               int Msg,　　　 // message

               int wParam,　// first message parameter

               IntPtr lParam // second message parameter

         );

        protected override void DefWndProc(ref Message m)
        {
            switch (m.Msg)
            {
                case WM_USERMSG:
                    Student s = (Student)Marshal.PtrToStructure(m.LParam, typeof(Student));
                    MessageBox.Show(s.name, s.id);
                    break;

            }
            base.DefWndProc(ref m);
        }

        private void button1_Click(object sender, EventArgs e)
        {
            Student s = new Student();
            s.name = "zhouweigang";
            s.id = "11103132";
            IntPtr handle = IntPtr.Zero;
            handle = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(Student)));
            Marshal.StructureToPtr(s, handle, true);

            if (handle != IntPtr.Zero)
            {
                SendMessage(this.Handle, WM_USERMSG, 0, handle);
            }
        }

    }
}