How to Make a Transparent Label Appear Over a PictureBox in C#?

Overlay transparent label control on PictureBox

In C#, when trying to display a transparent Label control (BackColor property set to transparent) on a PictureBox to monitor download progress, the Label may display a gray background. In order to solve this problem and achieve the desired transparency effect, you can try the following methods:

Method 1: Adjust parent and position attributes

1. In the form constructor, set the Label's Parent property to PictureBox.
2. Recalculate the Label's Location relative to the PictureBox (see answer for sample code).

Method 2: Customize during design

1. Add a reference to System.Design.
2. Create a new class called PictureContainer, which inherits from PictureBox.
3. Decorate the PictureContainer using the [Designer] attribute and pass the ParentControlDesigner as a parameter.

Example:

<code class="language-csharp">// 设计时自定义
[Designer(typeof(ParentControlDesigner))]
class PictureContainer : PictureBox {}

// 窗体构造函数
public Form1() {
    // 方法一：设置Parent和Location
    label1.Parent = picturebox1;
    label1.Location = picturebox1.PointToClient(label1.Parent.PointToScreen(label1.Location));
    label1.BackColor = Color.Transparent;
    // 方法二：使用PictureContainer代替Picturebox
    // 此处未显示
}</code>

By adopting either method, the Label control will be displayed transparently on the PictureBox, clearly showing the download progress.

The above is the detailed content of How to Make a Transparent Label Appear Over a PictureBox in C#?. For more information, please follow other related articles on the PHP Chinese website!