Control.CheckForIllegalCrossThreadCalls Property (System.Windows.Forms)

CheckForIllegalCrossThreadCalls Pro...

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Microsoft Visual Studio 2008/.NET Framework 3.5

Other versions are also available for the following:

.NET Framework Class Library

Control..::.CheckForIllegalCrossThreadCalls Property

Updated: November 2007

Gets or sets a value indicating whether to catch calls on the wrong thread that access a control's Handle property when an application is being debugged.

Namespace: System.Windows.Forms
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)

Syntax

Visual Basic (Declaration)

<BrowsableAttribute(False)> _
Public Shared Property CheckForIllegalCrossThreadCalls As Boolean

Visual Basic (Usage)

Dim value As Boolean

value = Control.CheckForIllegalCrossThreadCalls

Control.CheckForIllegalCrossThreadCalls = value

[BrowsableAttribute(false)]
public static bool CheckForIllegalCrossThreadCalls { get; set; }

Visual C++

[BrowsableAttribute(false)]
public:
static property bool CheckForIllegalCrossThreadCalls {
    bool get ();
    void set (bool value);
}

/** @property */
/** @attribute BrowsableAttribute(false) */
public static boolean get_CheckForIllegalCrossThreadCalls()
/** @property */
/** @attribute BrowsableAttribute(false) */
public static  void set_CheckForIllegalCrossThreadCalls(boolean value)

JScript

public static function get CheckForIllegalCrossThreadCalls () : boolean
public static function set CheckForIllegalCrossThreadCalls (value : boolean)

Property Value

Type: System..::.Boolean

true if calls on the wrong thread are caught; otherwise, false.

Remarks

When a thread other than the creating thread of a control tries to access one of that control's methods or properties, it often leads to unpredictable results. A common invalid thread activity is a call on the wrong thread that accesses the control's Handle property. Set CheckForIllegalCrossThreadCalls to true to find and diagnose this thread activity more easily while debugging. Note that illegal cross-thread calls will always raise an exception when an application is started outside the debugger.

Platforms

Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Version Information

.NET Framework

Supported in: 3.5, 3.0, 2.0

Reference

Control Class

Control Members

System.Windows.Forms Namespace

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