C#窗口窗体透明背景
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C# transparent background for window form
提问by user1207217
I've already seen Transparent background on winforms?
我已经在 winforms 上看到了透明背景？
it doesnt offer solution to my problem. I am using the same method to try to achieve transparency
它没有为我的问题提供解决方案。我正在使用相同的方法来尝试实现透明度
public Form1()
{
this.SetStyle(ControlStyles.SupportsTransparentBackColor, true);
InitializeComponent();
this.BackColor = Color.FromArgb(0, 0, 0, 0);
}
But this gives a grey background, not transparent. How can I get an actually transparent background (note, transparency key solutions do not give a transparent background, and when I paint with alpha channel less than 255, it blends with the set form background colour, and not the actual background)? I want to paint to certain regions of the screen with alpha < 255 and blend with the background (not the form).
但这给出了灰色背景，而不是透明的。我怎样才能得到一个真正透明的背景（注意，透明键解决方案不提供透明背景，当我用小于 255 的 alpha 通道绘画时，它与设置的表单背景颜色混合，而不是实际背景）？我想用 alpha < 255 绘制到屏幕的某些区域并与背景（不是表单）混合。
回答by Tommaso Belluzzo
The way I did it long time ago was to find an unused color for the form background and then set the transparency key to it:
很久以前我做的方法是为表单背景找到一个未使用的颜色，然后为其设置透明度键：
this.BackColor = Color.Magenta;
this.TransparencyKey = Color.Magenta;
Other ways are:
其他方式有：
- Creating a background image, painting the transparent area of it with a specific color and setting it as the form BackgroundImage... then setting the TransparencyKey to that color.
- Overriding OnPaintBackground method with an empty method.
- 创建背景图像，用特定颜色绘制它的透明区域并将其设置为表格 BackgroundImage... 然后将 TransparencyKey 设置为该颜色。
- 使用空方法覆盖 OnPaintBackground 方法。
[EDIT] As Mario states, normally the default transparent color for the key is Magenta.
[编辑] 正如马里奥所说，通常键的默认透明颜色是洋红色。
回答by a d
You can use a picture for this work. The color of bound of picture is Red , Next use this code
您可以将图片用于这项工作。图片边界颜色为红色，接下来使用此代码
this.TransparencyKey = Color.Red;
回答by ahmad mirza
This is the best way to make the transparent background of winform.
这是制作winform透明背景的最佳方式。
right after this:
在此之后：
public partial class frmTransparentBackcolor : Form
{
public frmTransparentBackcolor()
{
InitializeComponent();
//set the backcolor and transparencykey on same color.
this.BackColor = Color.LimeGreen;
this.TransparencyKey = Color.LimeGreen;
}
protected override void OnPaintBackground(PaintEventArgs e)
{
e.Graphics.FillRectangle(Brushes.LimeGreen, e.ClipRectangle);
}
}
hope this will help.
希望这会有所帮助。
回答by Pameela
public partial class TransprtScrcn : Form
{
public TransprtScrcn()
{
InitializeComponent();
this.BackColor = Color.Red;
this.TransparencyKey = Color.Red;
}
protected override void OnPaintBackground(PaintEventArgs e)
{
e.Graphics.FillRectangle(Brushes.Red, e.ClipRectangle);
}
}
}
