<Type Name="Timer" FullName="System.Threading.Timer" FullNameSP="System_Threading_Timer" Maintainer="ecma">
  <TypeSignature Language="ILASM" Value=".class public sealed Timer extends System.MarshalByRefObject implements System.IDisposable" />
  <TypeSignature Language="C#" Value="public sealed class Timer : MarshalByRefObject, IDisposable" />
  <MemberOfLibrary>BCL</MemberOfLibrary>
  <AssemblyInfo>
    <AssemblyName>mscorlib</AssemblyName>
    <AssemblyPublicKey>[00 00 00 00 00 00 00 00 04 00 00 00 00 00 00 00 ]</AssemblyPublicKey>
    <AssemblyVersion>1.0.5000.0</AssemblyVersion>
    <AssemblyVersion>2.0.0.0</AssemblyVersion>
    <AssemblyVersion>4.0.0.0</AssemblyVersion>
  </AssemblyInfo>
  <ThreadingSafetyStatement>All public static members of this type are safe for multithreaded operations. No instance members are guaranteed to be thread safe.</ThreadingSafetyStatement>
  <Base>
    <BaseTypeName>System.MarshalByRefObject</BaseTypeName>
  </Base>
  <Interfaces>
    <Interface>
      <InterfaceName>System.IDisposable</InterfaceName>
    </Interface>
  </Interfaces>
  <Docs>
    <summary>
      <para> Provides a mechanism for executing methods at specified intervals.
      </para>
    </summary>
    <remarks>
      <para>A <see cref="T:System.Threading.TimerCallback" /> delegate
   is used to specify the methods associated with a <see langword="Timer" /> . The methods do
   not execute in the thread that created the timer; they execute in a separate thread that is automatically
   allocated by the system. The timer delegate
   is specified when the timer is constructed, and cannot be changed.</para>
      <para>When creating a timer, the application specifies an
   amount of time to wait before the first invocation of the delegate methods (due time), and an amount
   of time to wait between subsequent invocations (period). A timer invokes its methods once
   when its due time elapses, and invokes its methods once per
   period thereafter. These values can be changed, or the timer disabled using the <see cref="M:System.Threading.Timer.Change(System.Int32,System.Int32)" />
   
   method.</para>
      <para> When a timer is no longer needed, use the <see cref="M:System.Threading.Timer.Dispose(System.Threading.WaitHandle)" />
method to free the resources held by the timer.</para>
    </remarks>
    <example>
      <para>The following example demonstrates the features of the <see cref="T:System.Threading.Timer" />
class.</para>
      <code lang="C#">using System;
using System.Threading;

class TimerExampleState {
    public int counter = 0;
    public Timer tmr;
}

class App {
   public static void Main() {
    TimerExampleState s = new TimerExampleState();

    // Create the delegate that invokes methods for the timer.
    TimerCallback timerDelegate = new TimerCallback(CheckStatus);

    // Create a timer that waits one second, then invokes every second.
    Timer timer = new Timer(timerDelegate, s, 1000, 1000);
    
    // Keep a handle to the timer, so it can be disposed.
    s.tmr = timer;

    // The main thread does nothing until the timer is disposed.
    while (s.tmr != null)
        Thread.Sleep(0);
    Console.WriteLine("Timer example done.");
   }
   // The following method is called by the timer's delegate.

   static void CheckStatus(Object state) {
    TimerExampleState s = (TimerExampleState) state;
    s.counter++;
          Console.WriteLine("{0} Checking Status {1}.",DateTime.Now.TimeOfDay, s.counter);
        if (s.counter == 5) {
        // Shorten the period. Wait 10 seconds to restart the timer.
        (s.tmr).Change(10000,100);
        Console.WriteLine("changed...");
    }
        if (s.counter == 10) {
        Console.WriteLine("disposing of timer...");
        s.tmr.Dispose();
        s.tmr = null;
    }
   }
}
</code>
      <para>An example of some output is</para>
      <c>
        <para>10:51:40.5809015 Checking Status 1.</para>
        <para>10:51:41.5823515 Checking Status 2.</para>
        <para>10:51:42.5838015 Checking Status 3.</para>
        <para>10:51:43.5852515 Checking Status 4.</para>
        <para>10:51:44.5867015 Checking Status 5.</para>
        <para>changed...</para>
        <para>10:51:54.5911870 Checking Status 6.</para>
        <para>10:51:54.6913320 Checking Status 7.</para>
        <para>10:51:54.7914770 Checking Status 8.</para>
        <para>10:51:54.8916220 Checking Status 9.</para>
        <para>10:51:54.9917670 Checking Status 10.</para>
        <para>disposing of timer...</para>
        <para>Timer example done.</para>
      </c>
      <para>The exact timings returned by this example will vary.</para>
    </example>
  </Docs>
  <Members>
    <Member MemberName=".ctor">
      <MemberSignature Language="C#" Value="public Timer (System.Threading.TimerCallback callback);" />
      <MemberType>Constructor</MemberType>
      <Parameters>
        <Parameter Name="callback" Type="System.Threading.TimerCallback" />
      </Parameters>
      <Docs>
        <param name="callback">To be added.</param>
        <summary>To be added.</summary>
        <remarks>To be added.</remarks>
        <since version=".NET 2.0" />
      </Docs>
      <AssemblyInfo>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
    </Member>
    <Member MemberName=".ctor">
      <MemberSignature Language="ILASM" Value="public rtspecialname specialname instance void .ctor(class System.Threading.TimerCallback callback, object state, int32 dueTime, int32 period)" />
      <MemberSignature Language="C#" Value="public Timer (System.Threading.TimerCallback callback, object state, int dueTime, int period);" />
      <MemberType>Constructor</MemberType>
      <ReturnValue />
      <Parameters>
        <Parameter Name="callback" Type="System.Threading.TimerCallback" />
        <Parameter Name="state" Type="System.Object" />
        <Parameter Name="dueTime" Type="System.Int32" />
        <Parameter Name="period" Type="System.Int32" />
      </Parameters>
      <Docs>
        <param name="callback">A <see cref="T:System.Threading.TimerCallback" /> delegate.</param>
        <param name="state">A <see cref="T:System.Object" /> containing application-specific information relevant to the methods invoked by <paramref name="callback" />, or <see langword="null" />.</param>
        <param name="dueTime">A <see cref="T:System.Int32" /> containing the amount of time to delay before <paramref name="callback" /> invokes its methods, in milliseconds. Specify <see cref="F:System.Threading.Timeout.Infinite" /> to prevent the timer from starting. Specify zero to start the timer immediately.</param>
        <param name="period">A <see cref="T:System.Int32" /> containing the time interval between invocations of the methods referenced by <paramref name="callback," /> in milliseconds. Specify <see cref="F:System.Threading.Timeout.Infinite" /> to disable periodic signaling.</param>
        <summary>
          <para>Constructs and initializes a new instance of the <see langword="Timer " />class.</para>
        </summary>
        <remarks>
          <para>
            <paramref name="callback" /> invokes its methods once after <paramref name="dueTime" /> elapses, and then invokes
   its methods each time the <paramref name="period" /> time interval elapses.</para>
          <para>If <paramref name="dueTime" /> is zero,
<paramref name="callback" /> performs 
its first invocation immediately. If <paramref name="dueTime" /> is
<see cref="F:System.Threading.Timeout.Infinite" />, <paramref name="callback" /> 
does not invoke its methods; the timer is disabled, but can be re-enabled using
the <see cref="M:System.Threading.Timer.Change(System.Int32,System.Int32)" />
method.</para>
          <para>If <paramref name="period " />is zero
or <see cref="F:System.Threading.Timeout.Infinite" /> and
<paramref name="dueTime" /> is not <see cref="F:System.Threading.Timeout.Infinite" />, <paramref name="callback" /> 
invokes its methods exactly once; the periodic behavior of the timer is
disabled, but can be re-enabled using the <see cref="M:System.Threading.Timer.Change(System.Int32,System.Int32)" />
method.</para>
        </remarks>
        <exception cref="T:System.ArgumentOutOfRangeException">
          <paramref name="dueTime" /> or <paramref name="period" /> is negative and is not equal to <see cref="F:System.Threading.Timeout.Infinite" />. </exception>
        <exception cref="T:System.ArgumentNullException">
          <paramref name="callback" /> is a <see langword="null" /> reference.</exception>
      </Docs>
      <Excluded>0</Excluded>
      <AssemblyInfo>
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        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
    </Member>
    <Member MemberName=".ctor">
      <MemberSignature Language="C#" Value="public Timer (System.Threading.TimerCallback callback, object state, long dueTime, long period);" />
      <MemberType>Constructor</MemberType>
      <Parameters>
        <Parameter Name="callback" Type="System.Threading.TimerCallback" />
        <Parameter Name="state" Type="System.Object" />
        <Parameter Name="dueTime" Type="System.Int64" />
        <Parameter Name="period" Type="System.Int64" />
      </Parameters>
      <Docs>
        <param name="callback">To be added.</param>
        <param name="state">To be added.</param>
        <param name="dueTime">To be added.</param>
        <param name="period">To be added.</param>
        <summary>To be added.</summary>
        <remarks>To be added.</remarks>
      </Docs>
      <AssemblyInfo>
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        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
    </Member>
    <Member MemberName=".ctor">
      <MemberSignature Language="ILASM" Value="public rtspecialname specialname instance void .ctor(class System.Threading.TimerCallback callback, object state, valuetype System.TimeSpan dueTime, valuetype System.TimeSpan period)" />
      <MemberSignature Language="C#" Value="public Timer (System.Threading.TimerCallback callback, object state, TimeSpan dueTime, TimeSpan period);" />
      <MemberType>Constructor</MemberType>
      <ReturnValue />
      <Parameters>
        <Parameter Name="callback" Type="System.Threading.TimerCallback" />
        <Parameter Name="state" Type="System.Object" />
        <Parameter Name="dueTime" Type="System.TimeSpan" />
        <Parameter Name="period" Type="System.TimeSpan" />
      </Parameters>
      <Docs>
        <param name="callback">A <see cref="T:System.Threading.TimerCallback" /> delegate.</param>
        <param name="state">A <see cref="T:System.Object" /> containing application-specific information relevant to the methods invoked by <paramref name="callback" />, or <see langword="null" /> .</param>
        <param name="dueTime">A <see cref="T:System.TimeSpan" /> set to the amount of time to delay before <paramref name="callback" /> invokes its methods. Set the value to <see cref="F:System.Threading.Timeout.Infinite" /> milliseconds to prevent the timer from starting. Specify zero to start the timer immediately.</param>
        <param name="period">A <see cref="T:System.TimeSpan" /> set to the time interval between invocations of the methods referenced by <paramref name="callback" /> . Set the value to <see cref="F:System.Threading.Timeout.Infinite" /> milliseconds to disable periodic signaling.</param>
        <summary>
          <para>Constructs and initializes a new instance of the <see langword="Timer " />class.</para>
        </summary>
        <remarks>
          <para>The <paramref name="callback" /> delegate invokes its methods
   once after <paramref name="dueTime" /> elapses, and then invokes its
   methods each time the <paramref name="period" /> time interval
   elapses.</para>
          <para>If <paramref name="dueTime," /> in milliseconds, is zero,
<paramref name="callback" /> performs its first invocation immediately. If <paramref name="dueTime" /> is <see cref="F:System.Threading.Timeout.Infinite" /> 
, no method invocation occurs. The timer is disabled, but can be re-enabled using
the <see cref="M:System.Threading.Timer.Change(System.Int32,System.Int32)" />
method.</para>
          <para>
If <paramref name="period " />is zero or <see cref="F:System.Threading.Timeout.Infinite" /> milliseconds and <paramref name="dueTime" /> is not <see cref="F:System.Threading.Timeout.Infinite" />, <paramref name="callback" />
invokes its methods exactly once. The periodic behavior of the timer is
disabled, but can be re-enabled using the <see cref="M:System.Threading.Timer.Change(System.Int32,System.Int32)" />
method.
</para>
        </remarks>
        <exception cref="T:System.ArgumentOutOfRangeException">The number of milliseconds in the value of <paramref name="dueTime" /> or <paramref name="period" /> is negative and not equal to <see cref="F:System.Threading.Timeout.Infinite" />, or is greater than <see cref="F:System.Int32.MaxValue" />.</exception>
        <exception cref="T:System.ArgumentNullException">
          <paramref name="callback" /> is a <see langword="null" /> reference.</exception>
      </Docs>
      <Excluded>0</Excluded>
      <AssemblyInfo>
        <AssemblyVersion>1.0.5000.0</AssemblyVersion>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
    </Member>
    <Member MemberName=".ctor">
      <MemberSignature Language="C#" Value="public Timer (System.Threading.TimerCallback callback, object state, uint dueTime, uint period);" />
      <MemberType>Constructor</MemberType>
      <Attributes>
        <Attribute>
          <AttributeName>System.CLSCompliant(false)</AttributeName>
        </Attribute>
      </Attributes>
      <Parameters>
        <Parameter Name="callback" Type="System.Threading.TimerCallback" />
        <Parameter Name="state" Type="System.Object" />
        <Parameter Name="dueTime" Type="System.UInt32" />
        <Parameter Name="period" Type="System.UInt32" />
      </Parameters>
      <Docs>
        <param name="callback">To be added.</param>
        <param name="state">To be added.</param>
        <param name="dueTime">To be added.</param>
        <param name="period">To be added.</param>
        <summary>To be added.</summary>
        <remarks>To be added.</remarks>
      </Docs>
      <AssemblyInfo>
        <AssemblyVersion>1.0.5000.0</AssemblyVersion>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
    </Member>
    <Member MemberName="Change">
      <MemberSignature Language="ILASM" Value=".method public hidebysig instance bool Change(int32 dueTime, int32 period)" />
      <MemberSignature Language="C#" Value="public bool Change (int dueTime, int period);" />
      <MemberType>Method</MemberType>
      <ReturnValue>
        <ReturnType>System.Boolean</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="dueTime" Type="System.Int32" />
        <Parameter Name="period" Type="System.Int32" />
      </Parameters>
      <Docs>
        <param name="dueTime">A <see cref="T:System.Int32" /> containing the amount of time to delay before the delegate specified at <see cref="T:System.Threading.Timer" /> construction time invokes its methods, in milliseconds. Specify <see cref="F:System.Threading.Timeout.Infinite" /> to prevent the timer from restarting. Specify zero to restart the timer immediately.</param>
        <param name="period">A <see cref="T:System.Int32" /> containing the time interval between invocations of the methods referenced by the delegate specified at <see cref="T:System.Threading.Timer" /> construction time<paramref name="," /> in milliseconds. Specify <see cref="F:System.Threading.Timeout.Infinite" /> to disable periodic signaling.</param>
        <summary>
          <para>
            <SPAN>
              <SPAN />
              <SPAN>
                <SPAN />
                <SPAN>
                  <SPAN />
                  <SPAN>
                    <SPAN />Changes the
   start time and interval between method invocations for a timer.</SPAN>
                </SPAN>
              </SPAN>
            </SPAN>
          </para>
        </summary>
        <returns>
          <para>
            <see langword="true " />
if the current instance has not been disposed; otherwise, <see langword="false" />. </para>
        </returns>
        <remarks>
          <para>The delegate specified at <see cref="T:System.Threading.Timer" /> construction time invokes its methods once after <paramref name="dueTime" /> elapses, and
   then invokes its methods each time the <paramref name="period" /> time interval elapses.</para>
          <para>If <paramref name="dueTime" /> is zero, the
delegate specified at <see cref="T:System.Threading.Timer" />
construction time performs its next invocation
immediately. If <paramref name="dueTime" /> is <see cref="F:System.Threading.Timeout.Infinite" />
, no method invocation occurs. The timer is disabled, but can be re-enabled by
calling this method and specifying a non-negative value for
<paramref name="dueTime" /> 
.</para>
          <para>
If <paramref name="period " />is zero or <see cref="F:System.Threading.Timeout.Infinite" /> and <paramref name="dueTime" /> is not <see cref="F:System.Threading.Timeout.Infinite" />, the
delegate specified at <see cref="T:System.Threading.Timer" />
construction time invokes its methods exactly once. The periodic
behavior of the timer is disabled, but can be re-enabled by calling this method
and specifying a positive value for <paramref name="period" />
.
</para>
        </remarks>
        <exception cref="T:System.ArgumentOutOfRangeException">
          <paramref name="dueTime" /> or <paramref name="period" /> is negative and is not equal to <see cref="F:System.Threading.Timeout.Infinite" /> .</exception>
      </Docs>
      <Excluded>0</Excluded>
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    </Member>
    <Member MemberName="Change">
      <MemberSignature Language="C#" Value="public bool Change (long dueTime, long period);" />
      <MemberType>Method</MemberType>
      <ReturnValue>
        <ReturnType>System.Boolean</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="dueTime" Type="System.Int64" />
        <Parameter Name="period" Type="System.Int64" />
      </Parameters>
      <Docs>
        <param name="dueTime">To be added.</param>
        <param name="period">To be added.</param>
        <summary>To be added.</summary>
        <returns>To be added.</returns>
        <remarks>To be added.</remarks>
      </Docs>
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    </Member>
    <Member MemberName="Change">
      <MemberSignature Language="ILASM" Value=".method public hidebysig instance bool Change(valuetype System.TimeSpan dueTime, valuetype System.TimeSpan period)" />
      <MemberSignature Language="C#" Value="public bool Change (TimeSpan dueTime, TimeSpan period);" />
      <MemberType>Method</MemberType>
      <ReturnValue>
        <ReturnType>System.Boolean</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="dueTime" Type="System.TimeSpan" />
        <Parameter Name="period" Type="System.TimeSpan" />
      </Parameters>
      <Docs>
        <param name="dueTime">A <see cref="T:System.TimeSpan" /> set to the amount of time to delay before the delegate specified at <see cref="T:System.Threading.Timer" /> construction time invokes its methods. Specify <see cref="F:System.Threading.Timeout.Infinite" /> milliseconds to prevent the timer from restarting. Specify zero to restart the timer immediately. </param>
        <param name="period">A <see cref="T:System.TimeSpan" /> set to the time interval between invocations of the methods referenced by the delegate specified at <see cref="T:System.Threading.Timer" /> construction time. Specify <see cref="F:System.Threading.Timeout.Infinite" /> milliseconds to disable periodic signaling. </param>
        <summary>
          <para>
            <SPAN>
              <SPAN />
              <SPAN>
                <SPAN />Changes the start time and
   interval between method invocations for a timer.</SPAN>
            </SPAN>
          </para>
        </summary>
        <returns>
          <para>
            <see langword="true " /> if the current instance has
   not been disposed; otherwise, <see langword="false" />.
   </para>
        </returns>
        <remarks>
          <para>The delegate specified at <see cref="T:System.Threading.Timer" /> construction time invokes its methods once after <paramref name="dueTime" /> elapses, and
   then invokes its methods each time the <paramref name="period" /> time interval elapses.</para>
          <para>If <paramref name="dueTime," /> in milliseconds,
is zero, the delegate specified at <see cref="T:System.Threading.Timer" /> construction time performs its
next invocation immediately. If <paramref name="dueTime" /> is <see cref="F:System.Threading.Timeout.Infinite" /> milliseconds, no method invocation occurs. The timer is disabled, but can be re-enabled by
calling this method and specifying a non-negative value for <paramref name="dueTime" />
.</para>
          <para>
If <paramref name="period " />is zero or <see cref="F:System.Threading.Timeout.Infinite" /> milliseconds and <paramref name="dueTime" /> is not
<see cref="F:System.Threading.Timeout.Infinite" /> milliseconds, the delegate specified at <see cref="T:System.Threading.Timer" /> 
construction time
invokes its methods exactly once. The periodic behavior of the timer is
disabled, but can be re-enabled by calling this method and specifying a positive
value for <paramref name="period" />
.
</para>
        </remarks>
        <exception cref="T:System.ArgumentOutOfRangeException">
          <paramref name="dueTime" /> or <paramref name="period" /> is negative and is not equal to <see cref="F:System.Threading.Timeout.Infinite" /> .</exception>
      </Docs>
      <Excluded>0</Excluded>
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    </Member>
    <Member MemberName="Change">
      <MemberSignature Language="C#" Value="public bool Change (uint dueTime, uint period);" />
      <MemberType>Method</MemberType>
      <ReturnValue>
        <ReturnType>System.Boolean</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="dueTime" Type="System.UInt32" />
        <Parameter Name="period" Type="System.UInt32" />
      </Parameters>
      <Docs>
        <param name="dueTime">To be added.</param>
        <param name="period">To be added.</param>
        <summary>To be added.</summary>
        <returns>To be added.</returns>
        <remarks>To be added.</remarks>
      </Docs>
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      <Attributes>
        <Attribute>
          <AttributeName>System.CLSCompliant(false)</AttributeName>
        </Attribute>
      </Attributes>
    </Member>
    <Member MemberName="Dispose">
      <MemberSignature Language="ILASM" Value=".method public final hidebysig virtual void Dispose()" />
      <MemberSignature Language="C#" Value="public void Dispose ();" />
      <MemberType>Method</MemberType>
      <ReturnValue>
        <ReturnType>System.Void</ReturnType>
      </ReturnValue>
      <Parameters />
      <Docs>
        <summary>
          <para>Releases the resources held by the current instance.</para>
        </summary>
        <remarks>
          <para>
            <block subset="none" type="note">This method is
 implemented to support the <see cref="T:System.IDisposable" />
 interface.</block>
          </para>
        </remarks>
      </Docs>
      <Excluded>0</Excluded>
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    </Member>
    <Member MemberName="Dispose">
      <MemberSignature Language="ILASM" Value=".method public hidebysig instance bool Dispose(class System.Threading.WaitHandle notifyObject)" />
      <MemberSignature Language="C#" Value="public bool Dispose (System.Threading.WaitHandle notifyObject);" />
      <MemberType>Method</MemberType>
      <ReturnValue>
        <ReturnType>System.Boolean</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="notifyObject" Type="System.Threading.WaitHandle" />
      </Parameters>
      <Docs>
        <param name="notifyObject">Specifies a <see cref="T:System.Threading.WaitHandle" /> to be signaled when the timer has been disposed of. </param>
        <summary>
          <para> Releases the resources held by the current instance.
      </para>
        </summary>
        <returns>
          <para>
            <see langword="true " />if the call succeeds;
   otherwise, <see langword="false" />.
   </para>
        </returns>
        <remarks>
          <para> When this method completes, the <see cref="T:System.Threading.WaitHandle" /> specified by <paramref name="notifyObject" /> is
   signaled.
   </para>
          <para>This method calls <see cref="M:System.GC.SuppressFinalize(System.Object)" /> to prevent the garbage collector from finalizing the
current instance.</para>
        </remarks>
        <exception cref="T:System.ArgumentNullException">
          <paramref name="notifyObject" /> is <see langword="null" />.</exception>
      </Docs>
      <Excluded>0</Excluded>
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    </Member>
  </Members>
  <TypeExcluded>0</TypeExcluded>
  <Attributes>
    <Attribute>
      <AttributeName>System.Runtime.InteropServices.ComVisible(true)</AttributeName>
    </Attribute>
  </Attributes>
</Type>
