Document ArgumentNull (#2091)

Azure · Jul 12, 2021 · 2fce30b · 2fce30b
1 parent e329559
commit 2fce30b
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/iothub/service/src/Common/Exceptions/ErrorCode.cs b/iothub/service/src/Common/Exceptions/ErrorCode.cs
@@ -50,7 +50,12 @@ public enum ErrorCode
         // Note: one example found in logs is for invalid characters in a twin property name.
         ArgumentInvalid = 400004,
 
+        /// <summary>
+        /// Something in the payload is unexpectedly null. Check the error message for more information about what is invalid.
+        /// </summary>
+        // Note: an example suggested is null method payloads, but our client converts null to a JSON null, which is allowed.
         ArgumentNull = 400005,
+
         IotHubFormatError = 400006,
 
         /// <summary>