auf ein environment zugreifen und dann in der angular.json
"production": {
"fileReplacements": [
{
"replace": "/src/environments/environment.ts",
"with": "/src/environments/environment.prod.ts"
}
],
durch mehrere catch- blocks können (zuerst) speziellere Exceptions behandelt werden , eine geauere auswahl kann durch when erzielt werden.
WebClient wc = null;
try
{
wc = new WebClient(); //downloading a web page
var resultData = wc.DownloadString("http://google.com");
}
catch (WebException ex) when (ex.Status == WebExceptionStatus.ProtocolError)
{
//code specifically for a WebException ProtocolError
}
catch (WebException ex) when ((ex.Response as HttpWebResponse)?.StatusCode == HttpStatusCode.NotFound)
{
//code specifically for a WebException NotFound
}
catch (WebException ex) when ((ex.Response as HttpWebResponse)?.StatusCode == HttpStatusCode.InternalServerError)
{
//code specifically for a WebException InternalServerError
}
finally
{
//call this if exception occurs or not
wc?.Dispose();
}