如何在C#中转换using语句？

Question

我正在使用asp.net,我想将以下语句转换为c#

Using response As HttpWebResponse = TryCast(request.GetResponse(), HttpWebResponse)
        Dim reader As New StreamReader(response.GetResponseStream())
        st = reader.ReadToEnd()
    End Using

如果有人知道,请告诉我.先感谢您.

Answer 1

那么,字面翻译将是:

using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)
{
    StreamReader reader = new StreamReader(response.GetResponseStream());
    st = reader.ReadToEnd();
}

然而,如果响应不是一个HttpWebResponse认为仍然会失败-只是一个NullReferenceException.我更喜欢演员:

using (HttpWebResponse response = (HttpWebResponse) request.GetResponse())
{
    StreamReader reader = new StreamReader(response.GetResponseStream());
    st = reader.ReadToEnd();
}

或者要非常小心,即使它不是网络响应,也会清除响应:

using (WebResponse response = request.GetResponse())
{
    HttpWebResponse httpResponse = (HttpWebResponse) response;
    StreamReader reader = new StreamReader(httpResponse.GetResponseStream());
    st = reader.ReadToEnd();
}

......但WebResponse已经包含了GetResponseStream,所以没有必要首先施展HttpWebResponse,说实话.