I have a scenario I need to set ApplicationProperties to a Azure Service Bus message. I have dictionary of key, value type <string,object>. I also use System.Text.Json for deserializing the payload from request.
I tried to recreate issue. I have a method which gives me the body payload. here I named it GetParams. It gives a nullable Dictionary of <string,object>
IDictionary<string, object>? GetParams()
{
bool shouldReturnParameters = true;
if (shouldReturnParameters)
{
string jsonString = "{\"Parameter1\": 123, \"Parameter2\": \"Some value\"}";
var parameters = JsonSerializer.Deserialize<Dictionary<string, object>>(jsonString);
return parameters;
}
else
{
return null;
}
}
Now in main method I try to send the message
var data = Encoding.UTF8.GetBytes(json);
var message = new ServiceBusMessage(data);
IDictionary<string, object>? params = GetParams();
if (params != null)
{
foreach (var param in params)
{
message.ApplicationProperties[param.Key] = param.Value;
}
}
await sender.SendMessageAsync(message); //ERROR!
Now I get unhandled exception System.Runtime.Serialization.SerializationException: Serialization failed due to an unsupported type, System.Text.Json.JsonElement.
When I debug the code param.Value had a property called ValueKind apart from the value. When I just hardode the values when assigning values like ApplicationProperties["Parameter1"] = 123 then it worked.
So is there a general solution for this problem. Do I have to do .toString() and do if checks to check each type like string, number, boolean etc and then parse the value to that type.
ApplicationProperties is of Dictionary<string, object> type. Individual values can only be made up of simple types Azure Service Bus allows as documentated.
If you need to assign an unsupported type, you'll need to serialize and store it as a string