try()-catch()中的问题 [英] Problem in try()-catch()
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问题描述
HttpRes在尝试"部分中进行了初始化,但我无法在尝试"部分中的HttpRes中使用相同的数量
HttpRes take initialize in section Try, but i can''t use HttpRes in section Catch with the same amount in Try
try
{
//Code Example
string url = "http://www." + TextBox1.Text;
HttpWebRequest httpReq = (HttpWebRequest)WebRequest.Create(url);
httpReq.AllowAutoRedirect = false;
HttpWebResponse httpRes = (HttpWebResponse)httpReq.GetResponse();
Label1.Text = (((HttpWebResponse)httpRes).StatusDescription);
// Close the response.
httpRes.Close();
}
catch
{
Label1.Text = (((HttpWebResponse)httpRes).StatusDescription);
}
推荐答案
仔细查看您的代码.您没有关闭try块.
Hi,
Look into you code carefully. You are not closing your try block.
try
{
//Code Example
string url = "http://www." + TextBox1.Text;
HttpWebRequest httpReq = (HttpWebRequest)WebRequest.Create(url);
httpReq.AllowAutoRedirect = false;
HttpWebResponse httpRes = (HttpWebResponse)httpReq.GetResponse();
Label1.Text = (((HttpWebResponse)httpRes).StatusDescription);
// Close the response.
httpRes.Close();
}//This was not there you missed.
catch
{
Label1.Text = (((HttpWebResponse)httpRes).StatusDescription);
}
只需在尝试使用Block之前声明httpRes
Just Declare The httpRes Before Try Block
HttpWebResponse httpRes;
try
{
//Code Example
string url = "http://www." + TextBox1.Text;
HttpWebRequest httpReq = (HttpWebRequest)WebRequest.Create(url);
httpReq.AllowAutoRedirect = false;
httpRes = (HttpWebResponse)httpReq.GetResponse();
Label1.Text = (((HttpWebResponse)httpRes).StatusDescription);
// Close the response.
httpRes.Close();
}
catch
{
Label1.Text = (((HttpWebResponse)httpRes).StatusDescription);
}
u像这样尝试之前先声明您的httpRes变量
u declare your httpRes variable before the try like this
HttpWebResponse httpRes;
try
{
//Code Example
string url = "http://www." + TextBox1.Text;
HttpWebRequest httpReq = (HttpWebRequest)WebRequest.Create(url);
httpReq.AllowAutoRedirect = false;
httpRes = (HttpWebResponse)httpReq.GetResponse();
Label1.Text = (((HttpWebResponse)httpRes).StatusDescription);
// Close the response.
httpRes.Close();
}//This was not there you missed.
catch
{
Label1.Text = (((HttpWebResponse)httpRes).StatusDescription);
}
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