ObjectDisposedException
ObjectDisposedException
ObjectDisposedException
ObjectDisposedException
Class
Definition
The exception that is thrown when an operation is performed on a disposed object.
public ref class ObjectDisposedException : InvalidOperationException
[System.Runtime.InteropServices.ComVisible(true)]
[System.Serializable]
public class ObjectDisposedException : InvalidOperationException
type ObjectDisposedException = class
inherit InvalidOperationException
Public Class ObjectDisposedException
Inherits InvalidOperationException
- Inheritance
-
InvalidOperationExceptionInvalidOperationExceptionInvalidOperationExceptionInvalidOperationExceptionObjectDisposedExceptionObjectDisposedExceptionObjectDisposedExceptionObjectDisposedException
- Attributes
Examples
The following example demonstrates an error that causes the ObjectDisposedException
exception to be thrown.
using namespace System;
using namespace System::IO;
int main()
{
MemoryStream^ ms = gcnew MemoryStream( 16 );
ms->Close();
try
{
ms->ReadByte();
}
catch ( ObjectDisposedException^ e )
{
Console::WriteLine( "Caught: {0}", e->Message );
}
}
using System;
using System.IO;
public class ObjectDisposedExceptionTest
{
public static void Main()
{
MemoryStream ms = new MemoryStream(16);
ms.Close();
try
{
ms.ReadByte();
}
catch (ObjectDisposedException e)
{
Console.WriteLine("Caught: {0}", e.Message);
}
}
}
Imports System
Imports System.IO
Public Class ObjectDisposedExceptionTest
Public Shared Sub Main()
Dim ms As New MemoryStream(16)
ms.Close()
Try
ms.ReadByte()
Catch e As ObjectDisposedException
Console.WriteLine("Caught: {0}", e.Message)
End Try
End Sub 'Main
End Class 'ObjectDisposedExceptionTest
This code produces the following output:
Caught:
Cannot access a closed Stream.
Remarks
An ObjectDisposedException is thrown when you try to access a member of an object that implements the IDisposable interface, and that object has been disposed. Typically, this exception is caused by one of the following conditions:
You've called an object's
Dispose
method, and you're trying to access an instance member that gets or sets the object's state. The following example illustrates the ObjectDisposedException that is thrown when you try to reset the frequency of timer notifications after you call the Timer.Dispose method.using System; using System.Threading; public class Example { public static void Main() { Timer t = new Timer(TimerNotification, null, 100, Timeout.Infinite); Thread.Sleep(2000); t.Dispose(); t.Change(200, 1000); Thread.Sleep(3000); } private static void TimerNotification(Object obj) { Console.WriteLine("Timer event fired at {0:F}", DateTime.Now); } } // The example displays output like the following: // Timer event fired at Monday, July 14, 2014 11:54:08 AM // // Unhandled Exception: System.ObjectDisposedException: Cannot access a disposed object. // at System.Threading.TimerQueueTimer.Change(UInt32 dueTime, UInt32 period) // at Example.Main()
Imports System.Threading Module Example Public Sub Main() Dim t As New Timer(AddressOf TimerNotification, Nothing, 100, Timeout.Infinite) Thread.Sleep(2000) t.Dispose() t.Change(200, 1000) Thread.Sleep(3000) End Sub Private Sub TimerNotification(obj As Object) Console.WriteLine("Timer event fired at {0:F}", Date.Now) End Sub End Module ' The example displays output like the following: ' Timer event fired at Monday, July 14, 2014 11:54:08 AM ' ' Unhandled Exception: System.ObjectDisposedException: Cannot access a disposed object. ' at System.Threading.TimerQueueTimer.Change(UInt32 dueTime, UInt32 period) ' at Example.Main()
You've called an object's
Close
method, and you're trying to access an instance member that gets or sets the object's state. Often, theClose
method provides a type's public implementation of the IDisposable.Dispose method.You've called an object's
Dispose
method multiple times. Typically, this doesn't throw an exception. However, depending on how a type implements IDisposable.Dispose, it may not allow multiple calls toDispose
.
In most cases, this exception results from developer error. Instead of handling the error in a try
/catch
block, you should correct the error, typically by reinstantiating the object.
Constructors
Properties
Data Data Data Data |
Gets a collection of key/value pairs that provide additional user-defined information about the exception. (Inherited from Exception) |
HelpLink HelpLink HelpLink HelpLink |
Gets or sets a link to the help file associated with this exception. (Inherited from Exception) |
HResult HResult HResult HResult |
Gets or sets HRESULT, a coded numerical value that is assigned to a specific exception. (Inherited from Exception) |
InnerException InnerException InnerException InnerException |
Gets the Exception instance that caused the current exception. (Inherited from Exception) |
Message Message Message Message |
Gets the message that describes the error. |
ObjectName ObjectName ObjectName ObjectName |
Gets the name of the disposed object. |
Source Source Source Source |
Gets or sets the name of the application or the object that causes the error. (Inherited from Exception) |
StackTrace StackTrace StackTrace StackTrace |
Gets a string representation of the immediate frames on the call stack. (Inherited from Exception) |
TargetSite TargetSite TargetSite TargetSite |
Gets the method that throws the current exception. (Inherited from Exception) |
Methods
Events
SerializeObjectState SerializeObjectState SerializeObjectState SerializeObjectState |
Occurs when an exception is serialized to create an exception state object that contains serialized data about the exception. (Inherited from Exception) |
Applies to
See also
Feedback
We'd love to hear your thoughts. Choose the type you'd like to provide:
Our feedback system is built on GitHub Issues. Read more on our blog.
Loading feedback...