Why Does Double Buffering Still Cause Flickering in WinForms, and How Can I Fix It?

WinForms double buffering flickering problem and solution

You have applied double buffering to the form by calling SetStyle() but the flickering problem still exists.

The following solution targets both the form and its child controls. The overall drawing process can be enhanced by adding double buffering to both. To do this, use the WS_EX_COMPOSITED style flag.

First, override the form's CreateParams attribute:

<code class="language-csharp">protected override CreateParams CreateParams {
  get {
    CreateParams cp = base.CreateParams;
    cp.ExStyle |= 0x02000000;  // 启用 WS_EX_COMPOSITED
    return cp;
  }
}</code>

While this will not directly speed up drawing, it will change the display behavior. The form appears immediately after a short delay rather than being drawn gradually, effectively eliminating flickering.

For a more comprehensive solution, consider replacing the control with custom drawing and event handling. This involves manually drawing control-style elements in the OnPaint method and handling user interaction via the OnMouseClick event.

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