Question

这是我的代码：

string Url = "http://illution.dk/";
WebClient Http = new WebClient();
Http.DownloadStringAsync(new Uri(Url));
Http.DownloadStringCompleted += new DownloadStringCompletedEventHandler(GetModelTypeResponse);

如果我在没有互联网连接的计算机上运行此操作，则会引发错误。 “主机名无法解析”

有什么办法可以删除此错误消息吗？或者检查是否没有互联网连接？

修改1

try
{
ComputerInfo ComputerInfoComp = new ComputerInfo();
string Url = "http://illution.dk/"
WebClient Http = new WebClient();
Http.DownloadStringAsync(new Uri(Url));
Http.DownloadStringCompleted += new         DownloadStringCompletedEventHandler(GetModelTypeResponse);
ComputerInfoComp = null;
}
catch (System.Net.WebException e)
{
//
}

Answer 1

在e.Error处理程序方法中检查GetModelTypeResponse。如果e.Error的类型为WebException，请检查webException.Status值。如果“无法解析主机名”异常

，则值为WebExceptionStatus.NameResolutionFailure

public void GetModelTypeResponse(object sender, DownloadStringCompletedEventArgs e)
{
    var webException = e.Error as WebException;
    if (webException != null && 
        webException.Status == WebExceptionStatus.NameResolutionFailure)
    {
        // log
        return; // ignore
    }

    // proceed
    ..
}

Answer 2

是的，通过捕获该特定异常。见http://msdn.microsoft.com/en-us/library/ms173160(v=vs.80).aspx

Answer 3

将您的代码放入try ... catch块。 Google exceptions了解更多信息。

取消错误“主机名无法解析”

3 个答案: