Process.GetProcessById Method (Int32)
Returns a new Process component, given the identifier of a process on the local computer.
Assembly: System (in System.dll)
Parameters
- processId
-
Type:
System.Int32
The system-unique identifier of a process resource.
Return Value
Type: System.Diagnostics.ProcessA Process component that is associated with the local process resource identified by the processId parameter.
| Exception | Condition |
|---|---|
| ArgumentException | The process specified by the processId parameter is not running. The identifier might be expired. |
| InvalidOperationException | The process was not started by this object. |
Use this method to create a new Process component and associate it with a process resource on the local computer. The process resource must already exist on the computer, because GetProcessById(Int32) does not create a system resource, but rather associates a resource with an application-generated Process component. A process Id can be retrieved only for a process that is currently running on the computer. After the process terminates, GetProcessById(Int32) throws an exception if you pass it an expired identifier.
On any particular computer, the identifier of a process is unique. GetProcessById(Int32) returns one process at most. If you want to get all the processes running a particular application, use GetProcessesByName(String). If multiple processes exist on the computer running the specified application, GetProcessesByName(String) returns an array containing all the associated processes. You can query each of these processes in turn for its identifier. The process identifier can be viewed in the Processes panel of the Windows Task Manager. The PID column displays the process identifier that is assigned to a process.
The following example retrieves information of the current process, processes running on the local computer, all instances of Notepad running on the local computer, and a specific process on the local computer. It then retrieves information for the same processes on a remote computer.
Imports System Imports System.Diagnostics Imports System.ComponentModel Namespace MyProcessSample Class MyProcess Sub BindToRunningProcesses() ' Get the current process. You can use currentProcess from this point ' to access various properties and call methods to control the process. Dim currentProcess As Process = Process.GetCurrentProcess() ' Get all processes running on the local computer. Dim localAll As Process() = Process.GetProcesses() ' Get all instances of Notepad running on the local computer. ' This will return an empty array if notepad isn't running. Dim localByName As Process() = Process.GetProcessesByName("notepad") ' Get a process on the local computer, using the process id. ' This will throw an exception if there is no such process. Dim localById As Process = Process.GetProcessById(1234) ' Get processes running on a remote computer. Note that this ' and all the following calls will timeout and throw an exception ' if "myComputer" and 169.0.0.0 do not exist on your local network. ' Get all processes on a remote computer. Dim remoteAll As Process() = Process.GetProcesses("myComputer") ' Get all instances of Notepad running on the specific computer, using machine name. Dim remoteByName As Process() = Process.GetProcessesByName("notepad", "myComputer") ' Get all instances of Notepad running on the specific computer, using IP address. Dim ipByName As Process() = Process.GetProcessesByName("notepad", "169.0.0.0") ' Get a process on a remote computer, using the process id and machine name. Dim remoteById As Process = Process.GetProcessById(2345, "myComputer") End Sub 'BindToRunningProcesses Shared Sub Main() Dim myProcess As New MyProcess() myProcess.BindToRunningProcesses() End Sub 'Main End Class 'MyProcess End Namespace 'MyProcessSample
for full trust for the immediate caller. This member cannot be used by partially trusted code.
Available since 1.1