vb.net 关闭指定应用程序的窗体的多种方法

关闭指定应用程序窗体的方法有多种，下面列举了几种常见的方法：

1. 使用 `Process` 类的 `CloseMainWindow` 方法：

   Dim processes() As Process = Process.GetProcessesByName("应用程序名称")
   For Each process As Process In processes
       process.CloseMainWindow()
   Next

2. 使用 `Process` 类的 `Kill` 方法：

   Dim processes() As Process = Process.GetProcessesByName("应用程序名称")
   For Each process As Process In processes
       process.Kill()
   Next

3. 使用 `SendMessage` 函数发送关闭消息：

   Imports System.Runtime.InteropServices

   Public Class Form1
       <DllImport("user32.dll", SetLastError:=True)> _
       Private Shared Function FindWindow(ByVal lpClassName As String, ByVal lpWindowName As String) As IntPtr
       End Function

       <DllImport("user32.dll", SetLastError:=True)> _
       Private Shared Function SendMessage(ByVal hWnd As IntPtr, ByVal Msg As Integer, ByVal wParam As Integer, ByVal lParam As Integer) As Integer
       End Function

       Private Const WM_CLOSE As Integer = &H10

       Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
           Dim hWnd As IntPtr = FindWindow(Nothing, "窗体标题")
           If hWnd <> IntPtr.Zero Then
               SendMessage(hWnd, WM_CLOSE, 0, 0)
           End If
       End Sub
   End Class

这些方法可以根据你的需要选择适合的方法来关闭指定应用程序的窗体。请注意，这些方法可能会强制关闭应用程序，导致未保存的数据丢失，请谨慎使用。