Process对象的Start方法可能是程序员最不受重视的工具之一。作为一个.NET方法，Start有一系列重载，这些重载是不同的参数集，它们精确地确定了该方法的功能。重载允许您指定在另一个进程启动时可能要传递给另一个进程的任何参数集。

您可以使用Process.Start做什么实际上只受您可以使用的流程的限制。如果您想在记事本中显示基于文本的自述文件，只需执行以下操作：

Process.Start("ReadMe.txt") Process.Start("notepad", "ReadMe.txt")

本例假设自述文件与程序位于同一文件夹中，记事本是.txt文件类型的默认应用程序，并且它位于系统环境路径中。

process.start类似于vb6中的shell命令

对于熟悉VisualBasic6的程序员，Process.Start有点像VB6shell命令。在VB 6中，您将使用以下内容：

lngPID = Shell("MyTextFile.txt", vbNormalFocus)

使用process.start

您可以使用此代码启动记事本最大化，并创建ProcessStartInfo对象，以便进行更精确的控制：

Dim ProcessProperties As New ProcessStartInfoProcessProperties.FileName = "notepad"ProcessProperties.Arguments = "myTextFile.txt"ProcessProperties.WindowStyle = ProcessWindowStyle.MaximizedDim myProcess As Process = Process.Start(ProcessProperties)

启动隐藏进程

你甚至可以开始一个隐藏的过程。

ProcessProperties.WindowStyle = ProcessWindowStyle.Hidden

正在检索进程的名称

将Process.Start作为.NET对象使用可以提供很多功能。例如，您可以检索已启动的进程的名称。此代码将在输出窗口中显示“记事本”：

Dim myProcess As Process = Process.Start("MyTextFile.txt") Console.WriteLine(myProcess.ProcessName)This was something you could not do with the VB6 Shell command because it launched the new application asynchronously. Using WaitForExit can cause the reverse problem in .NET because you have to launch a process in a new thread if you need it to execute asynchronously. For example, if you need the components to remain active in a form where a process was launched and WaitForExit

One way to force the process to halt is to use the Kill method.

myProcess.Kill()

This code waits for ten seconds and then ends the process.

However, a forced delay is sometimes necessary to allow the process to complete exiting to avoid an error.

myProcess.WaitForExit(10000)' if the process doesn't complete within' 10 seconds, kill itIf Not myProcess.HasExited ThenmyProcess.Kill()End IfThreading.Thread.Sleep(1)Console.WriteLine("Notepad ended: " _& myProcess.ExitTime & _Environment.NewLine & _"Exit Code: " & _myProcess.ExitCode)

In most cases, it's probably a good idea to put your processing in a Using block to ensure that the resources used by the process are released.

Using myProcess As Process = New Process' Your code goes hereEnd Using

To make all this even easier to work with, there is even a Process component that you can add to your project so you can do a lot of the things shown above at design time instead of run time.

One of the things that this makes a lot easier is coding events raised by the process, such as the event when the process has exited. You can also add a handler using code like this:

' allow the process to raise eventsmyProcess.EnableRaisingEvents = True' add an Exited event handlerAddHandler myProcess.Exited, _AddressOf Me.ProcessExitedPrivate Sub ProcessExited(ByVal sender As Object, _ByVal e As System.EventArgs)' Your code goes hereEnd Sub

But simply selecting the event for the component is a lot easier.