VB.NET 如果抛出异常，SqlConnection 是否会在 Try/Catch 中自动关闭？

Question

没有找到确切的 question/answer。在 VB.NET 中，如果我在 Try/Catch 块中打开一个 SqlConnection，并抛出一个异常（正确捕获），连接是隐式关闭，还是我必须关闭它？（如果尝试失败，它甚至会打开吗？）

我自己会 "test" 这个，但我真的不知道在抛出异常时如何判断连接是打开还是关闭。

谢谢！

Answer 1

不。这就是为什么您要在 try/catch 之前声明连接变量并向其添加 finally 以确保您有连接的地方可以关闭和处置：

 Dim con As New SqlClientConnection( . . .)

 Try
      ' DB Operations (create, read, update, delete) here
      con.open()

 Catch SqlClientException (ex)

     ' Deal with exception
 Finally
      ' Code here will always run, whether or not the try code succeeded
      ' or if you wound up in a catch block. You can safely call .close()
      ' or (as shown below) .dispose() because if the connection is already
      ' closed/disposed, the call doesn't do anything.


      ' Dispose is what you want - it will not only close the
      ' connection, but it will release the .NET reference to
      ' the remote resource, freeing up that resource (the database
      ' in this case) to serve other clients.

      con.Dispose()

 End Try

VB.NET 如果抛出异常，SqlConnection 是否会在 Try/Catch 中自动关闭？

VB.NET Does SqlConnection get closed automatically in a Try/Catch if exception is thrown?

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