【原创】使用timer、imagelist与notifyicon控件实现图标闪烁-----并避免了GDI泄漏（重点）

一、未考虑GDI泄漏的代码：后果是直接导致程序的GDI数一直增加，直到程序crash（崩溃）为止

int i = 0;

private void timer1_Tick(object sender, EventArgs e)
{
Bitmap btm1 = new Bitmap(this.imageList1.Images[0]);
Icon icon1 = Icon.FromHandle(btm1.GetHicon());
Bitmap btm2 = new Bitmap(this.imageList1.Images[1]);
Icon icon2 = Icon.FromHandle(btm2.GetHicon());

if (i < 1)
{
this.notifyIcon1.Icon = icon1;
i = 1;
}
else
{
this.notifyIcon1.Icon = icon2;
i = 0;
}

}

二、修改之后的代码：

int i = 0;

[System.Runtime.InteropServices.DllImport("user32.dll")]
extern static bool DestroyIcon(IntPtr handle);

private void timer1_Tick(object sender, EventArgs e)
{
Bitmap btm1 = new Bitmap(this.imageList1.Images[0]);
Icon icon1 = Icon.FromHandle(btm1.GetHicon());
Bitmap btm2 = new Bitmap(this.imageList1.Images[1]);
Icon icon2 = Icon.FromHandle(btm2.GetHicon());

if (i < 1)
{
this.notifyIcon1.Icon = icon1;
i = 1;
}
else
{
this.notifyIcon1.Icon = icon2;
i = 0;
}

DestroyIcon(icon2.Handle);
DestroyIcon(icon1.Handle);

}