C# 窗体渐变

Question

我想做的就是以 100 的不透明度显示表单，然后在 X 时间后它开始淡化直到 0.0 的不透明度，我有算法但我不知道在哪里实现它，就像我在Form_Load 表单已经显示出最终的不透明度，以及在 InitializeComponent() 之后；

this.Opacity = 1.0;

for (float i = 1.0f; i >= 0.0f; i -= 0.1f)
{
    this.Opacity = i;
    Thread.Sleep(150);
}

Answer 1

使用 Shown Event, which happens only once after the Form loads, or, if you want it to happen every time the form gets Focus, use the Activated Event.

在Form1.cs中：

private void Form1_Shown(object sender, EventArgs e)
{
    this.Opacity = 1.0;

    for (float i = 1.0f; i >= 0.0f; i -= 0.1f)
    {
        this.Opacity = i;
        Thread.Sleep(150);
    }
}

在Form1.Designer.cs中：

this.Shown += new System.EventHandler(this.Form1_Shown);

如果要使窗体不可见但控件仍然可见，可以使用 TransparencyKey 属性:

private void Form1_Shown(object sender, EventArgs e)
{
    // Choose some obscure background that no other controls will have
    this.BackColor = Color.Red;
    this.TransparencyKey = this.BackColor;
}

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