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/// <summary>
/// 当按钮得到焦点
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void button1_Enter(object sender, EventArgs e)
{
button1.BackgroundImage = imageList1.Images[0];
}
/// <summary>
/// 当按钮失去焦点
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void button1_Leave(object sender, EventArgs e)
{
button1.BackgroundImage = null;
}