Jak mogę złapać 404?
Mam następujący kod:
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
request.Method = "HEAD";
request.Credentials = MyCredentialCache;
try
{
request.GetResponse();
}
catch
{
}
Jak mogę złapać konkretny błąd 404? WebExceptionStatus.ProtocolError może tylko wykryć, że wystąpił błąd, ale nie podać dokładnego kodu błędu.
Na przykład:
catch (WebException ex)
{
if (ex.Status != WebExceptionStatus.ProtocolError)
{
throw ex;
}
}
Nie jest wystarczająco przydatna... wyjątkiem protokołu może być 401, 503, 403, cokolwiek. 10 answers
Użyj HttpStatusCode Enumeration
, a konkretnie HttpStatusCode.NotFound
Coś w stylu:
HttpWebResponse errorResponse = we.Response as HttpWebResponse;
if (errorResponse.StatusCode == HttpStatusCode.NotFound) {
//
}
Gdziewe
jest WebException
.
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/doraprojects.net/template/agent.layouts/content.php on line 54
2009-12-22 22:32:32
try
{
var request = WebRequest.Create(uri);
using (var response = request.GetResponse())
{
using (var responseStream = response.GetResponseStream())
{
// Process the stream
}
}
}
catch (WebException ex)
{
if (ex.Status == WebExceptionStatus.ProtocolError &&
ex.Response != null)
{
var resp = (HttpWebResponse) ex.Response;
if (resp.StatusCode == HttpStatusCode.NotFound)
{
// Do something
}
else
{
// Do something else
}
}
else
{
// Do something else
}
}
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/doraprojects.net/template/agent.layouts/content.php on line 54
2010-01-28 17:34:55
Nie testowałem tego, ale powinno działać
try
{
// TODO: Make request.
}
catch (WebException ex)
{
if (ex.Status == WebExceptionStatus.ProtocolError) {
HttpWebResponse resp = ex.Response as HttpWebResponse;
if (resp != null && resp.StatusCode == HttpStatusCode.NotFound)
{
// TODO: Handle 404 error.
}
else
throw;
}
else
throw;
}
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/doraprojects.net/template/agent.layouts/content.php on line 54
2010-02-27 11:16:46
W C # 6 możesz używać filtrów WYJĄTKÓW .
try
{
var request = WebRequest.Create(uri);
using (var response = request.GetResponse())
using (var responseStream = response.GetResponseStream())
{
// Process the stream
}
}
catch(WebException ex) when ((ex.Response as HttpWebResponse)?.StatusCode == HttpStatusCode.NotFound)
{
// handle 404 exceptions
}
catch (WebException ex)
{
// handle other web exceptions
}
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/doraprojects.net/template/agent.layouts/content.php on line 54
2015-12-04 04:21:29
Myślę, że jeśli złapiesz WebException , znajdziesz tam pewne informacje, których możesz użyć, aby określić, czy to był 404. To jedyny sposób, jaki znam w tej chwili...Chciałbym znać innych...
catch(WebException e) {
if(e.Status == WebExceptionStatus.ProtocolError) {
var statusCode = (HttpWebResponse)e.Response).StatusCode);
var description = (HttpWebResponse)e.Response).StatusDescription);
}
}
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/doraprojects.net/template/agent.layouts/content.php on line 54
2009-12-22 22:55:26
Zobacz też GetResponse rzuci WebRequestException. Złap to, a otrzymasz kod statusu z odpowiedzi.
try {
// Create a web request for an invalid site. Substitute the "invalid site" strong in the Create call with a invalid name.
HttpWebRequest myHttpWebRequest = (HttpWebRequest) WebRequest.Create("invalid site");
// Get the associated response for the above request.
HttpWebResponse myHttpWebResponse = (HttpWebResponse) myHttpWebRequest.GetResponse();
myHttpWebResponse.Close();
}
catch(WebException e) {
Console.WriteLine("This program is expected to throw WebException on successful run."+
"\n\nException Message :" + e.Message);
if(e.Status == WebExceptionStatus.ProtocolError) {
Console.WriteLine("Status Code : {0}", ((HttpWebResponse)e.Response).StatusCode);
Console.WriteLine("Status Description : {0}", ((HttpWebResponse)e.Response).StatusDescription);
}
}
catch(Exception e) {
Console.WriteLine(e.Message);
}
To pochodzi z http://msdn.microsoft.com/en-us/library/system.net.webexception.status.aspx
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/doraprojects.net/template/agent.layouts/content.php on line 54
2009-12-22 22:34:10
Zobacz w MSDN o statusie odpowiedzi:
...
catch(WebException e) {
Console.WriteLine("The following error occured : {0}",e.Status);
}
...
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/doraprojects.net/template/agent.layouts/content.php on line 54
2010-01-28 16:07:01
Dla VB.NET ludzie, którzy to przeglądają, wierzę, że możemy złapać wyjątek tylko wtedy, gdy naprawdę jest to 404. Coś w stylu:
Try
httpWebrequest.GetResponse()
Catch we As WebException When we.Response IsNot Nothing _
AndAlso TypeOf we.Response Is HttpWebResponse _
AndAlso (DirectCast(we.Response, HttpWebResponse).StatusCode = HttpStatusCode.NotFound)
' ...
End Try
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/doraprojects.net/template/agent.layouts/content.php on line 54
2014-05-16 21:16:32
Złapać właściwy typ wyjątku WebException
:
try
{
var request = (HttpWebRequest) WebRequest.Create(String.Format("http://www.gravatar.com/avatar/{0}?d=404", hashe));
using(var response = (HttpWebResponse)request.GetResponse())
Response.Write("has avatar");
}
catch(WebException e)
{
if(e.Response.StatusCode == 404)
Response.Write("No avatar");
}
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/doraprojects.net/template/agent.layouts/content.php on line 54
2010-01-27 18:57:49
Gdy POST lub GET dane do serwera za pomocą klasy WebRequest, typ wyjątku będzie WebException.Poniżej znajduje się kod wyjątku file not found
//Create a web request with the specified URL
string path = @"http://localhost/test.xml1";
WebRequest myWebRequest = WebRequest.Create(path);
//Senda a web request and wait for response.
try
{
WebResponse objwebResponse = myWebRequest.GetResponse();
Stream stream= objwebResponse.GetResponseStream();
}
catch (WebException ex) {
if (((HttpWebResponse)(ex.Response)).StatusCode == HttpStatusCode.NotFound) {
throw new FileNotFoundException(ex.Message);
}
}
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/doraprojects.net/template/agent.layouts/content.php on line 54
2016-08-19 18:25:04