(轉)winform Form 淡入淡出效果

原文地址：http://blog.csdn.net/a237428367/article/details/5933565

using System.Runtime.InteropServices;
 
public class Win32
        {
            public const Int32 AW_HOR_POSITIVE = 0x00000001;    // 從左到右打開視窗
            public const Int32 AW_HOR_NEGATIVE = 0x00000002;    // 從右到左打開視窗
            public const Int32 AW_VER_POSITIVE = 0x00000004;    // 從上到下打開視窗
            public const Int32 AW_VER_NEGATIVE = 0x00000008;    // 從下到上打開視窗
            public const Int32 AW_CENTER = 0x00000010;
            public const Int32 AW_HIDE = 0x00010000;        // 在窗體卸載時若想使用本函數就得加上此常量
            public const Int32 AW_ACTIVATE = 0x00020000;    //在窗體通過本函數打開後，預設情況下會失去焦點，除非加上本常量
            public const Int32 AW_SLIDE = 0x00040000;
            public const Int32 AW_BLEND = 0x00080000;       // 淡入淡出效果
            [DllImport("user32.dll", CharSet = CharSet.Auto)]
            public static extern bool AnimateWindow(
            IntPtr hwnd, // handle to window   
            int dwTime, // duration of animation   
            int dwFlags // animation type   
            );
        }
 
/*淡入窗體*/
private void Form_Load(object sender, EventArgs e)
{
        Win32.AnimateWindow(this.Handle, 2000, Win32.AW_BLEND);
}
/*淡出窗體*/
private void Form_FormClosing(object sender, FormClosingEventArgs e)
{
    Win32.AnimateWindow(this.Handle, 2000, Win32.AW_SLIDE | Win32.AW_HIDE | Win32.AW_BLEND);
}