Question

我想在我的表单中添加一个标签，我希望它没有任何颜色 - 我希望它的文字可见，我在标签的属性中找不到这个选项，有人可以帮我吗？

Answer 1

你想让标签（文字除外）透明吗？ Windows Forms（我假设WinForms - 这是真的）并不真正支持透明度。有时，最简单的方法是将Label的Backcolor变为透明。

label1.BackColor = System.Drawing.Color.Transparent;

但是你会遇到问题，因为WinForms确实没有正确支持透明度。否则，请看这里：

http://www.doogal.co.uk/transparent.php

http://www.codeproject.com/KB/dotnet/transparent_controls_net.aspx

http://www.daniweb.com/code/snippet216425.html

Setting the parent of a usercontrol prevents it from being transparent

祝你好运！

Answer 2

this.label1.BackColor = System.Drawing.Color.Transparent;

Answer 3

如果您在后台显示图片框，则使用此：

label1.Parent = pictureBox1;
label1.BackColor = Color.Transparent;

将此代码放在InitializeComponent();下方或Form_Load方法中。

参考：https://www.c-sharpcorner.com/blogs/how-to-make-a-transparent-label-over-a-picturebox1

Answer 4

你是对的。但这是使标签的背景色透明的最简单方法在该标签的属性窗口中，选择 Web 。在Web中，选择透明：）

Answer 5

通常，出现在图像前面的标签和文本框最好组织在面板中。渲染时，如果标签需要对面板内的图像透明，您可以像这样在表单初始化中切换到图像作为标签的父级：

var oldParent = panel1;
var newParent = pictureBox1;

foreach (var label in oldParent.Controls.OfType<Label>())
{
    label.Location = newParent.PointToClient(label.Parent.PointToScreen(label.Location));
    label.Parent = newParent;
    label.BackColor = Color.Transparent;
}

Answer 6

这使用了 Graphics.CopyFromScreen，因此需要在它在屏幕上可见时添加控件。

public partial class TransparentLabelControl : Label
{
    public TransparentLabelControl()
    {
        this.AutoSize = true;
        this.Visible = false;

        this.ImageAlign = ContentAlignment.TopLeft;
        this.Visible = true;

        this.Resize += TransparentLabelControl_Resize;
        this.LocationChanged += TransparentLabelControl_LocationChanged;
        this.TextChanged += TransparentLabelControl_TextChanged;
        this.ParentChanged += TransparentLabelControl_ParentChanged;
    }

    #region Events
    private void TransparentLabelControl_ParentChanged(object sender, EventArgs e)
    {
        SetTransparent();
        if (this.Parent != null)
        {
            this.Parent.ControlAdded += Parent_ControlAdded;
            this.Parent.ControlRemoved += Parent_ControlRemoved;
        }
    }

    private void Parent_ControlRemoved(object sender, ControlEventArgs e)
    {
        SetTransparent();
    }

    private void Parent_ControlAdded(object sender, ControlEventArgs e)
    {
        if (this.Bounds.IntersectsWith(e.Control.Bounds))
        {
            SetTransparent();
        }
    }

    private void TransparentLabelControl_TextChanged(object sender, EventArgs e)
    {
        SetTransparent();
    }

    private void TransparentLabelControl_LocationChanged(object sender, EventArgs e)
    {

        SetTransparent();
    }

    private void TransparentLabelControl_Resize(object sender, EventArgs e)
    {
        SetTransparent();
    }
    #endregion

    public void SetTransparent()
    {
        if (this.Parent!= null)
        {
            this.Visible = false;
            this.Image = this.takeComponentScreenShot(this.Parent);
            this.Visible = true;                
        }
    }

    private  Bitmap takeComponentScreenShot(Control control)
    {
        Rectangle rect = control.RectangleToScreen(this.Bounds);
        if (rect.Width == 0 || rect.Height == 0)
        {
            return null;
        }
        Bitmap bmp = new Bitmap(rect.Width, rect.Height, PixelFormat.Format32bppArgb);
        Graphics g = Graphics.FromImage(bmp);

        g.CopyFromScreen(rect.Left, rect.Top, 0, 0, bmp.Size, CopyPixelOperation.SourceCopy);

        return bmp;
    }

}

如何为标签做背景将没有颜色？

6 个答案: