Process.WaitForInputIdle Method ()

Causes the Process component to wait indefinitely for the associated process to enter an idle state. This overload applies only to processes with a user interface and, therefore, a message loop.

Namespace: System.Diagnostics
Assembly: System (in system.dll)

public bool WaitForInputIdle ()
public boolean WaitForInputIdle ()
public function WaitForInputIdle () : boolean

Return Value

true if the associated process has reached an idle state; otherwise, false.

Use WaitForInputIdle to force the processing of your application to wait until the message loop has returned to the idle state. When a process with a user interface is executing, its message loop executes every time a Windows message is sent to the process by the operating system. The process then returns to the message loop. A process is said to be in an idle state when it is waiting for messages inside of a message loop. This state is useful, for example, when your application needs to wait for a starting process to finish creating its main window before the application communicates with that window.

If a process does not have a message loop, WaitForInputIdle immediately returns false.

This overload of WaitForInputIdle instructs the Process component to wait indefinitely for the process to become idle in the message loop. This instruction can cause an application to stop responding. For example, if the process is written to always exit its message loop immediately, as in the code fragment while(true).

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

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

.NET Framework

Supported in: 2.0, 1.1, 1.0

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