(转)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;    // 从左到右打开窗口
            public const int32 aw_hor_negative = 0x00000002;    // 从右到左打开窗口
            public const int32 aw_ver_positive = 0x00000004;    // 从上到下打开窗口
            public const int32 aw_ver_negative = 0x00000008;    // 从下到上打开窗口
            public const int32 aw_center = 0x00000010;
            public const int32 aw_hide = 0x00010000;        // 在窗体卸载时若想使用本函数就得加上此常量
            public const int32 aw_activate = 0x00020000;    //在窗体通过本函数打开后，默认情况下会失去焦点，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   
            );
        }
 
/*淡入窗体*/
private void form_load(object sender, eventargs e)
{
        win32.animatewindow(this.handle, 2000, win32.aw_blend);
}
/*淡出窗体*/
private void form_formclosing(object sender, formclosingeventargs e)
{
    win32.animatewindow(this.handle, 2000, win32.aw_slide | win32.aw_hide | win32.aw_blend);
}