Question

我环顾四周，找不到答案，所以我想我会问这里。我有一个程序调用一个API，在头文件中传递登录信息，服务器在验证时返回一些信息。问题是如果用户信誉不正确，程序崩溃并抛出异常。错误是401.如何捕捉到这一点，并告诉用户？我的代码是：

Dim request = TryCast(System.Net.WebRequest.Create("https://myurl.com"), System.Net.HttpWebRequest)

    request.Method = "GET"

    request.Headers.Add("authorization", "Bearer " + AccessToken)

    request.ContentLength = 0
    Dim responseContent As String
    Using response = TryCast(request.GetResponse(), System.Net.HttpWebResponse)
        Using reader = New System.IO.StreamReader(response.GetResponseStream())
            responseContent = reader.ReadToEnd()
            MessageBox.Show(responseContent)
        End Using
    End Using

感谢。

Answer 1

使用try catch语句

try
   'My error prone code
catch ex as Exception
   'Handle my error
end try

    Try

        Dim request = TryCast(System.Net.WebRequest.Create("https://myurl.com"), System.Net.HttpWebRequest)

        request.Method = "GET"

        request.Headers.Add("authorization", "Bearer " + AccessToken)

        request.ContentLength = 0
        Dim responseContent As String
        Using response = TryCast(request.GetResponse(), System.Net.HttpWebResponse)
            Using reader = New System.IO.StreamReader(response.GetResponseStream())
                responseContent = reader.ReadToEnd()
                MessageBox.Show(responseContent)
            End Using
        End Using

    Catch ex As Exception
        MessageBox.Show(ex.ToString(), "Error", MessageBoxButtons.OK, MessageBoxIcon.Error)
    End Try

使用HTTPWebRequests，VB.NET进行错误处理

1 个答案: