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VSConstants.UICONTEXT_DesignMode Field

Specifies the UI context for design mode.

Namespace:  Microsoft.VisualStudio
Assemblies:   Microsoft.VisualStudio.Shell.12.0 (in Microsoft.VisualStudio.Shell.12.0.dll)
  Microsoft.VisualStudio.Shell.14.0 (in Microsoft.VisualStudio.Shell.14.0.dll)

public static readonly Guid UICONTEXT_DesignMode

A successful call to GetCmdUIContextCookie with UICONTEXT_DesignMode as the first parameter returns the GUID value of the command UI context associated with this specific UI state.

The new UI context (which in this case is UICONTEXT_DesignMode) may be retrieved with a call to OnCmdUIContextChanged.

This method is not valid (will return E_FAIL) when the IDE is in Command Line Mode.

UICONTEXT_DesignMode is active when the Visual Studio is in design mode (as opposed to, say, debugging mode), regardless of the presence of specific packages

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