How to Display a Transparent Label Over a PictureBox in C#?

Show transparent label above PictureBox in C# form

In C# forms, when trying to display a transparent label on a PictureBox, users may encounter a gray background instead of the expected transparency effect. This is because PictureBox is not a container control.

Solution 1: Code Implementation

To resolve this issue, modify the form constructor, change the label's parent to a PictureBox and recalculate its position.

<code class="language-csharp">public Form1() {
    InitializeComponent();
    var pos = label1.Parent.PointToScreen(label1.Location);
    pos = pictureBox1.PointToClient(pos);
    label1.Parent = pictureBox1;
    label1.Location = pos;
    label1.BackColor = Color.Transparent;
}</code>

Solution 2: Design-time enhancement

Alternatively, solve the design-time problem by creating a custom class that inherits from ParentControlDesigner.

<code class="language-csharp">using System.ComponentModel;
using System.Windows.Forms;
using System.Windows.Forms.Design;    // 添加对System.Design的引用

[Designer(typeof(ParentControlDesigner))]
class PictureContainer : PictureBox {}</code>

Description

Set PictureBox as a container control through the above method, the label will become a child control of PictureBox, and its transparency will be displayed correctly on top of PictureBox.

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