Null reference error if JSonData key does not exist

[shaitaaan]

Hi,

Please see the code below:

Code: Select all

public void OnExtensionResponse(object data, string type) 
{ 
    if (type == SmartFoxClient.XTMSG_TYPE_JSON) 
    { 
        JsonData responseObject = (JsonData)data; 
        if(responseObject[key] != null)
        {
             value = responseObject[key];
        }
    } 
}

If the key is not present, then a null reference exception is thrown. JSonData does not have a .Contains method either. How do I check if the object contains a certain key?

Thank you.

[ThomasLund]

Usually by convention.

E.g. I always have a "cmd" that I _always_ use in each object sent, so I know what I got in my hand. From there it is simply a matter of knowing that e.g. cmd == "move" has a "x" and "y" coordinate that contains ints.

LitJson is pretty bare bones - but fast and small. Tradeoffs when deciding what to use

/Thomas