[英]How to determine a 404 response status when using the HttpClient.GetAsync()
我正在尝试使用 C# 和 .NET 4.5 确定在出现 404 错误的情况下HttpClient
的GetAsync
方法返回的response
。
目前我只能判断发生了错误,而不能判断错误的状态,例如 404 或超时。
目前我的代码我的代码如下所示:
static void Main(string[] args)
{
dotest("http://error.123");
Console.ReadLine();
}
static async void dotest(string url)
{
HttpClient client = new HttpClient();
HttpResponseMessage response = new HttpResponseMessage();
try
{
response = await client.GetAsync(url);
if (response.IsSuccessStatusCode)
{
Console.WriteLine(response.StatusCode.ToString());
}
else
{
// problems handling here
string msg = response.IsSuccessStatusCode.ToString();
throw new Exception(msg);
}
}
catch (Exception e)
{
// .. and understanding the error here
Console.WriteLine( e.ToString() );
}
}
我的问题是我无法处理异常并确定其状态和其他出错细节。
我将如何正确处理异常并解释发生了什么错误?
您可以简单地检查响应的StatusCode
属性:
static async void dotest(string url)
{
using (HttpClient client = new HttpClient())
{
HttpResponseMessage response = await client.GetAsync(url);
if (response.IsSuccessStatusCode)
{
Console.WriteLine(response.StatusCode.ToString());
}
else
{
// problems handling here
Console.WriteLine(
"Error occurred, the status code is: {0}",
response.StatusCode
);
}
}
}
属性response.StatusCode
是一个HttpStatusCode枚举。
这是我用来获得油炸名称的代码
if (response != null)
{
int numericStatusCode = (int)response.StatusCode;
// like: 503 (ServiceUnavailable)
string friendlyStatusCode = $"{ numericStatusCode } ({ response.StatusCode })";
// ...
}
或者只报告错误时
if (response != null)
{
int statusCode = (int)response.StatusCode;
// 1xx-3xx are no real errors, while 3xx may indicate a miss configuration;
// 9xx are not common but sometimes used for internal purposes
// so probably it is not wanted to show them to the user
bool errorOccured = (statusCode >= 400);
string friendlyStatusCode = "";
if(errorOccured == true)
{
friendlyStatusCode = $"{ statusCode } ({ response.StatusCode })";
}
// ....
}
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