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HostProtectionAttribute.ExternalThreading Property

Gets or sets a value indicating whether external threading is exposed.

Namespace:  System.Security.Permissions
Assembly:  mscorlib (in mscorlib.dll)

public bool ExternalThreading { get; set; }

Property Value

Type: System.Boolean
true if external threading is exposed; otherwise, false. The default is false.

Code that exposes external threading creates or manipulates threads other than its own, which might be harmful to the host.

The following code example illustrates the use of the HostProtectionAttribute attribute with the ExternalThreading property. This example is part of a larger example provided for the HostProtectionAttribute class.

// Use the enumeration flags to indicate that this method exposes  
// synchronization and external threading.
[HostProtectionAttribute(Synchronization=true, ExternalThreading=true)]
private static void StartThread()
{
    Thread t = new Thread(new ThreadStart(WatchFileEvents));

    // Start the new thread. On a uniprocessor, the thread is not given 
    // any processor time until the main thread yields the processor.
    t.Start();

    // Give the new thread a chance to execute.
    Thread.Sleep(1000);
}

.NET Framework

Supported in: 4.5.3, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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

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