ThreadStateException Class

Definition

Namespace:

System.Threading

Assembly:

System.Threading.Thread.dll

Source:

ThreadStateException.cs

The exception that is thrown when a Thread is in an invalid ThreadState for the method call.

public ref class ThreadStateException : SystemException

public class ThreadStateException : SystemException

type ThreadStateException = class
    inherit SystemException

Public Class ThreadStateException
Inherits SystemException

Inheritance

Object

Exception

SystemException

ThreadStateException

Examples

The following example demonstrates an error that causes the system to throw a ThreadStateException.

using namespace System;
using namespace System::Threading;
ref class ThreadWork
{
public:
   static void DoWork()
   {
      Console::WriteLine( "Working thread..." );
   }

};

int main()
{
   ThreadStart^ myThreadDelegate = gcnew ThreadStart( ThreadWork::DoWork );
   Thread^ myThread = gcnew Thread( myThreadDelegate );
   myThread->Start();
   Thread::Sleep( 0 );
   Console::WriteLine( "In main. Attempting to restart myThread." );
   try
   {
      myThread->Start();
   }
   catch ( ThreadStateException^ e ) 
   {
      Console::WriteLine( "Caught: {0}", e->Message );
   }

}

using System;
using System.Threading;

public class ThreadWork
{
   public static void DoWork()
   {
      Console.WriteLine("Working thread...");
   }
}

class ThreadStateTest
{
   public static void Main()
   {
      ThreadStart myThreadDelegate = new ThreadStart(ThreadWork.DoWork);
      Thread myThread = new Thread(myThreadDelegate);
      myThread.Start();
      Thread.Sleep(0);
      Console.WriteLine("In main. Attempting to restart myThread.");
      try
      {
         myThread.Start();
      }
      catch (ThreadStateException e)
      {
         Console.WriteLine("Caught: {0}", e.Message);
      }
   }
}

Imports System.Threading

Public Class ThreadWork
   
   Public Shared Sub DoWork()
      Console.WriteLine("Working thread...")
   End Sub
End Class

Class ThreadStateTest
   
   Public Shared Sub Main()
      Dim myThreadDelegate As New ThreadStart(AddressOf ThreadWork.DoWork)
      Dim myThread As New Thread(myThreadDelegate)
      myThread.Start()
      Thread.Sleep(0)
      Console.WriteLine("In main. Attempting to restart myThread.")
      Try
         myThread.Start()
      Catch e As ThreadStateException
         Console.WriteLine("Caught: {0}", e.Message)
      End Try
   End Sub
End Class

This code produces the following output:

In main. Attempting to restart myThread.  
    Working thread...  
    Caught: Thread is running or terminated. Cannot restart.  

Remarks

Once a thread is created, it is in at least one of the ThreadState states until it terminates. ThreadStateException is thrown by methods that cannot perform the requested operation due to the current state of a thread. For example, trying to restart an aborted thread by calling Start on a thread that has terminated throws a ThreadStateException.

ThreadStateException uses the HRESULT COR_E_THREADSTATE, which has the value 0x80131520.

For a list of initial property values for an instance of ThreadStateException, see the ThreadStateException constructors.

Constructors

ThreadStateException()	Initializes a new instance of the ThreadStateException class with default properties.
ThreadStateException(SerializationInfo, StreamingContext)	Obsolete. Initializes a new instance of the ThreadStateException class with serialized data.
ThreadStateException(String)	Initializes a new instance of the ThreadStateException class with a specified error message.
ThreadStateException(String, Exception)	Initializes a new instance of the ThreadStateException class with a specified error message and a reference to the inner exception that is the cause of this exception.

Properties

Data	Gets a collection of key/value pairs that provide additional user-defined information about the exception. (Inherited from Exception)
HelpLink	Gets or sets a link to the help file associated with this exception. (Inherited from Exception)
HResult	Gets or sets HRESULT, a coded numerical value that is assigned to a specific exception. (Inherited from Exception)
InnerException	Gets the Exception instance that caused the current exception. (Inherited from Exception)
Message	Gets a message that describes the current exception. (Inherited from Exception)
Source	Gets or sets the name of the application or the object that causes the error. (Inherited from Exception)
StackTrace	Gets a string representation of the immediate frames on the call stack. (Inherited from Exception)
TargetSite	Gets the method that throws the current exception. (Inherited from Exception)

Methods

Equals(Object)	Determines whether the specified object is equal to the current object. (Inherited from Object)
GetBaseException()	When overridden in a derived class, returns the Exception that is the root cause of one or more subsequent exceptions. (Inherited from Exception)
GetHashCode()	Serves as the default hash function. (Inherited from Object)
GetObjectData(SerializationInfo, StreamingContext)	Obsolete. When overridden in a derived class, sets the SerializationInfo with information about the exception. (Inherited from Exception)
GetType()	Gets the runtime type of the current instance. (Inherited from Exception)
MemberwiseClone()	Creates a shallow copy of the current Object. (Inherited from Object)
ToString()	Creates and returns a string representation of the current exception. (Inherited from Exception)

Events

SerializeObjectState

Obsolete. Occurs when an exception is serialized to create an exception state object that contains serialized data about the exception. (Inherited from Exception)

See also

• Thread
• ThreadState
• Exception
• Handling and throwing exceptions in .NET