Process.Id 属性

public:
 property int Id { int get(); };

public int Id { get; }

member this.Id : int

Public ReadOnly Property Id As Integer

属性值

此 Process 实例引用的进程的系统生成的唯一标识符。

例外

示例

以下示例演示如何获取 Id 应用程序的所有正在运行的实例。 该代码创建记事本的新实例，列出记事本的所有实例，然后允许用户输入 Id 数字以删除特定实例。

using System;
using System.Threading;
using System.Security.Permissions;
using System.Security.Principal;
using System.Diagnostics;

class ProcessDemo
{
    public static void Main()
    {
        Process notePad = Process.Start("notepad");
        Console.WriteLine("Started notepad process Id = " + notePad.Id);
        Console.WriteLine("All instances of notepad:");
        // Get Process objects for all running instances on notepad.
        Process[] localByName = Process.GetProcessesByName("notepad");
        int i = localByName.Length;
        while (i > 0)
        {
            // You can use the process Id to pass to other applications or to
            // reference that particular instance of the application.
            Console.WriteLine(localByName[i - 1].Id.ToString());
            i -= 1;
        }

        i = localByName.Length;
        while (i > 0)
        {
            Console.WriteLine("Enter a process Id to kill the process");
            string id = Console.ReadLine();
            if (string.IsNullOrEmpty(id))
                break;

            try
            {
                using (Process chosen = Process.GetProcessById(Int32.Parse(id)))
                {
                    if (chosen.ProcessName == "notepad")
                    {
                        chosen.Kill();
                        chosen.WaitForExit();
                    }
                }
            }
            catch (Exception e)
            {
                Console.WriteLine("Incorrect entry.");
                continue;
            }

            i -= 1;
        }
    }
}

open System
open System.Diagnostics

let notePad = Process.Start "notepad"
printfn $"Started notepad process Id = {notePad.Id}"
printfn "All instances of notepad:"
// Get Process objects for all running instances on notepad.
let localByName = Process.GetProcessesByName "notepad"
let mutable i = localByName.Length

while i > 0 do
    // You can use the process Id to pass to other applications or to
    // reference that particular instance of the application.
    printfn $"{localByName.[i - 1].Id}"
    i <- i - 1

i <- localByName.Length

while i > 0 do
    printfn "Enter a process Id to kill the process"
    let id = Console.ReadLine()

    if String.IsNullOrEmpty id then
        i <- 0
    else
        try
            use chosen = Int32.Parse id |> Process.GetProcessById

            if chosen.ProcessName = "notepad" then
                chosen.Kill()
                chosen.WaitForExit()

            i <- i - 1
        with e ->
            printfn "Incorrect entry."

Imports System.Threading
Imports System.Security.Permissions
Imports System.Security.Principal
Imports System.Diagnostics



Class ProcessDemo

    Public Shared Sub Main()
        Dim notePad As Process = Process.Start("notepad")
        Console.WriteLine("Started notepad process Id = " + notePad.Id.ToString())
        Console.WriteLine("All instances of notepad:")
        ' Get Process objects for all running instances on notepad.
        Dim localByName As Process() = Process.GetProcessesByName("notepad")
        Dim i As Integer = localByName.Length
        While i > 0
            ' You can use the process Id to pass to other applications or to
            ' reference that particular instance of the application.
            Console.WriteLine(localByName((i - 1)).Id.ToString())
            i -= 1
        End While

        i = localByName.Length
        While i > 0
            Console.WriteLine("Enter a process Id to kill the process")
            Dim id As String = Console.ReadLine()
            If id = String.Empty Then
                Exit While
            End If
            Try
                Using chosen As Process = Process.GetProcessById(Int32.Parse(id))
                    If chosen.ProcessName = "notepad" Then
                        chosen.Kill()
                        chosen.WaitForExit()
                    End If
                End Using
            Catch e As Exception
                Console.WriteLine("Incorrect entry.")
                GoTo ContinueWhile1
            End Try
            i -= 1
ContinueWhile1:
        End While

    End Sub
End Class

注解

如果关联的进程未运行，则进程 Id 无效。 因此，在尝试检索 Id 属性之前，应确保进程正在运行。 在进程终止之前，进程标识符会在整个系统中唯一标识进程。

可以通过将进程标识符传递给Process方法，将本地或远程计算机上运行的进程连接到新GetProcessById实例。 GetProcessById 是一个 static 方法，用于创建新组件并自动设置 Id 新 Process 实例的属性。

进程标识符可由系统重复使用。 仅当关联的进程正在运行时，属性值 Id 才是唯一的。 进程终止后，系统可以重复使用 Id 不相关的进程的属性值。

由于标识符在系统上是唯一的，因此你可以将其传递给其他线程，作为传递 Process 实例的替代方法。 此操作可以节省系统资源，但可以保证正确识别该过程。

另请参阅

• Handle
• GetProcessById(Int32, String)