How Can I Determine Design Mode from a Control's Constructor?

Detecting Design-Time vs. Run-Time within a Control Constructor

A common question involves identifying whether a control is in design mode or run-time mode from its constructor. While seemingly unusual, this is achievable.

The key lies in the LicenseManager.UsageMode property within the System.ComponentModel namespace. This property provides an enumeration that indicates the current application mode. The following code snippet effectively determines the mode:

<code class="language-csharp">bool isInDesignMode = (LicenseManager.UsageMode == LicenseUsageMode.Designtime);</code>

This concise method offers a reliable way to differentiate between design-time and run-time environments directly within a control's constructor.

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