Catch block didn't caught exception when fail postasjsonasync api failed due to internetdisconnected

Question

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whenever PostAsJsonAsync api failed due to internet disconnect at the time catch block didn't catch the exception. I want to catch the exception if internet disconnected

C#

try
{
Data cus = new Data { Searchterm = searchterm };                    
  response = await  httpclient.PostAsJsonAsync(request.RequestUri,cus);               
  If(response.IsSuccessStatusCode)
   {                   
 var customerresult = await response.Content.ReadFromJsonAsync<customerresponse>();
 customers= customerresult.BaseObjects.ToList();
    }
}
catch (HttpRequestException ex)
{
         navigationmanager.NavigateTo("\page");
 }

I want to catch the exception if internet disconnectedplese help me
thanks

What I have tried:

I want to catch the exception if internet disconnected

Posted 24-Jan-23 6:04am

Ramesh p

Updated 24-Jan-23 14:23pm

PIEBALDconsult

v3

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Comments

Richard MacCutchan 24-Jan-23 12:15pm

Maybe the call is not throwing an exception. You can check by removing the try/catch and checking what happens.

Ramesh p 24-Jan-23 12:27pm

ERR_INTERNET_DISCONNECTED shows on browser console. we need to handle. previsuly I had handle for external external api failed due to internetdiconnected. I had used try and catch for handle

Richard MacCutchan 24-Jan-23 12:31pm

That is an error response, not an exception. So you need to add an else clause to your if block to handle unsuccessful return values.

Ramesh p 24-Jan-23 13:01pm

initally i had handle for external api same like required web api

Richard MacCutchan 24-Jan-23 14:15pm

I have no idea what that means. But look at your code:

  If(response.IsSuccessStatusCode)
   {                   
 var customerresult = await response.Content.ReadFromJsonAsync<customerresponse>();
 customers= customerresult.BaseObjects.ToList();
    }

Just add below it:

else
{
    // handle non-success return codes here
    var status = response.StatusCode;
    // display its value
}

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Pete O'Hanlon · Answer 1 · 2023-01-24T08:53:00

Solution 1

Rather than checking response.IsStatusCode, use response.EnsureSuccessStatusCode();. What this does is throw an exception if the status code indicates that the response was not successful. The good news about this is it validates far more than whether or not the network connection was disconnected during the call.

Posted 24-Jan-23 8:53am

Pete O'Hanlon

Comments

Ramesh p 25-Jan-23 4:59am

Actually while call the api at this below line when the internet disconnected at the time needs to catch the exception on catch block but how response.isstatscode excuted

response = await httpclient.PostAsJsonAsync(request.RequestUri,cus);

Pete O'Hanlon 25-Jan-23 8:17am

A disconnect does not trigger an exception - it's just an error code. What you need to wait for, is for the async call to time out. Once you get the timeout, EnsureSuccessStatusCode() will trigger an exception. If you want to reduce the timeout on your HttpClient, you can specify that as an option. I believe the default is 100 seconds.