.net - 尝试...捕获...最后在VB.NET中

Question

在VB.NET中，如果您从Catch返回一个值，那么Finally代码是否仍将执行？

例如(我对此代码进行了概括):

Try
    response = Client.doRequest()
Catch ex As Exception
    'Request threw an error - Fatal failure.
    InsertErrorLog(ex)
    Return False
Finally
    DisposeClient()
End Try

我需要确保 DisposeClient()一直执行。因为我要退出 Catch，仍然会执行 Finally吗？

Answer 1

不管是否执行 Finally 块，无论执行什么代码，始终执行 Catch 块。

引用:https://msdn.microsoft.com/en-us/library/fk6t46tz.aspx

使用以下代码尝试一下:

Dim Temp As String

Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
    Temp = "A"

    MessageBox.Show(Test())
    MessageBox.Show(Temp)
End Sub

Private Function Test() As String
    Try
        Temp = "B"
        Throw New Exception()
        Temp = "C"

        Return "Try"
    Catch ex As Exception
        Temp = "D"
        Return "Catch"
    Finally
        Temp = "E"
    End Try

    Temp = "F"
    Return "End"
End Function

它显示消息:

Catch

然后

E

这意味着，即使函数确实在 Finally 块中返回，也始终执行 Catch 块。