Question

我正在使用webservice来调用其他服务。我必须用循环调用许多服务。

现在的问题是，当某些服务不可用时，循环就会中断。

HttpWebRequest request = WebRequest.Create(stringBuilder.ToString()) as HttpWebRequest;
request.ContentType = "application/json; charset=utf-8";
request.Credentials = CredentialCache.DefaultCredentials;
response = (HttpWebResponse)request.GetResponse();
if (response.StatusCode != HttpStatusCode.OK)
{
    continue;
}

当服务不可用时（错误500），在我检查statusCode之前它已经坏了。

response = (HttpWebResponse)request.GetResponse();

时出错

如何检查错误并继续与其他服务通话？

Answer 1

这是设计并在文档中有详细解释，请参阅：http://msdn.microsoft.com/en-us/library/system.net.httpwebrequest.getresponse.aspx

如果抛出WebException，请使用的Response和Status属性确定服务器响应的异常。

使您的代码看起来像：

HttpWebRequest request = WebRequest.Create(stringBuilder.ToString()) as HttpWebRequest; 
request.ContentType = "application/json; charset=utf-8"; 
request.Credentials = CredentialCache.DefaultCredentials; 
try
{
    response = (HttpWebResponse)request.GetResponse(); 

    // perform normal processing
}
catch(WebException ex)
{
    // are you sure you just want to swallow the exception like this?
    continue;
}

HttpWebRequest避免错误（500）

1 个答案: