It is not necessary to follow these guidelines, but they are the convention. If you try to get the Process. ExitCode before the process has exited, the attempt throws an exception. Examine the Process.
System.Diagnostics.Process Class
HasExited property first to verify whether the associated process has terminated. You can use the System.
Kill method to cause an associated process to exit. There are two ways of being notified when the associated process exits: synchronously and asynchronously. Synchronous notification relies on calling the Process. WaitForExit method to pause the processing of your application until the associated component exits. Asynchronous notification relies on the Process. Exited event. In either case, Process. EnableRaisingEvents must be set to true for the Process component to receive notification that the process has exited. The Process instance has been attached to a running process but you do not have the necessary permissions to get a handle with full access rights.
Only processes started through a call to Process. Start set the Process. Handle property of the corresponding Process instances. A process can terminate independently of your code. If you started the process using this component, the system updates the value of Process.
HasExited automatically, even if the associated process exits independently. There is no process associated with this Process object. You can connect a process that is running on a local or remote computer to a new Process instance by passing the process identifier to the System. Id property for the new Process instance automatically.
Process identifiers can be reused by the system. The Process. Id property value is unique only while the associated process is running.
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After the process has terminated, the system can reuse the Process. Id property value for an unrelated process. Because the identifier is unique on the system, you can pass it to other threads as an alternative to passing a Process instance. This action can save system resources yet guarantee that the process is correctly identified. The property value is null if the Component is removed from its IContainer.
Assigning null to this property does not necessarily remove the Component from the IContainer.
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A Component might or might not have a name. If a Component is given a name, the name must be unique among other Component objects within its IContainer. The ISite stores the name of the Component ; therefore, you can only name a Component if it has an ISite associated with it. The Process component communicates with a child process via a pipe. If a child process writes enough data to the pipe to fill the buffer, the child will block until the parent reads the data from the pipe. This can cause deadlock if your application is reading all output to standard error and standard output, for example, using the following C code.
In this instance, both the parent and the child processes would be blocked, as the filled pipe prevents the child process from completing, while the parent process is waiting indefinitely for the child process to exit. A similar problem arises if you redirect both standard output and standard error and then try to read both, for example using the following C code.
In this case, if the child process writes any text to standard error it will block the process, because the parent process cannot read from standard error until it has finished reading from standard output.
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However, the parent process will not read from standard output until the process ends. A recommended solution to this situation is to create two threads so that your application can read the output of each stream on a separate thread. The only necessary Process. StartInfo member to set is the ProcessStartInfo.
FileName property. Starting a process by specifying the ProcessStartInfo. FileName property is similar to typing the information in the Run dialog box of the Windows Start menu. Therefore, the ProcessStartInfo. FileName property does not need to represent an executable file. It can be of any file type for which the extension has been associated with an application installed on the system. For example the ProcessStartInfo. FileName can have a. Similarly, in the same way that the Run dialog box can accept an executable file name with or without the.
FileName member. For example, you can set the ProcessStartInfo. FileName property to either "Notepad. If the file name involves a non-executable file, such as a.
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For example, you could set the System. Verb not supported on the shared source CLI to "Print" for a file ending in the. The file name specified in the ProcessStartInfo. FileName property does not need to have an extension if you manually enter a value for the System.
Verb not supported on the shared source CLI property. However, if you use the System. Verbs not supported on the shared source CLI property to determine what verbs are available, you must include the file extension. When the process is started, the file name is the file that populates the read-only System. MainModule not supported on the shared source CLI property. If you want to retrieve the executable file that is associated with the process after the process has started, use the System.
If you want to set the executable file of a Process instance for which an associated process has not been started, use the Process. StartInfo property's ProcessStartInfo. Because the members of the Process. StartInfo property are arguments that are passed to the Process. Start method of a process, changing the ProcessStartInfo. FileName property after the associated process has started will not reset the System. These properties are used only to initialize the associated process. When the Process. Exited event is handled by a visual Windows Forms component, such as a Button , accessing the component through the system thread pool might not work, or may result in an exception.
Avoid this by setting Process. SynchronizingObject to a Windows Forms component, which causes the methods handling the Process. Exited event to be called on the same thread on which the component was created. If the Process is used inside Visual Studio. SynchronizingObject is automatically set to the control containing the Process. For example, if you place a Process on a designer for Form1 which inherits from Form the Process. SynchronizingObject property of Process is set to the instance of Form1.
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Typically, this property is set when the component is placed inside a control or form, because those components are bound to a specific thread. Like the similar System. GetCurrentProcess associates an existing resource with a new Process component. This value is null if the Component does not provide the specified service. You are attempting to call Process. Kill for a process that is running on a remote computer. The method is available only for processes running on the local computer. Data edited by the process or resources allocated to the process can be lost if you call Process.
Kill causes an abnormal process termination and should be used only when necessary.
CloseMainWindow not supported on the shared source CLI enables an orderly termination of the process and closes all windows, so it is preferable for applications with an interface. If System. Kill to terminate the process.