Conditionally adding a new json.net JProperty

Question

Is it possible to create a new JProperty if an object contains a particular variable? For example:

string object = "var2";

var json = new JObject(
    new JProperty("var1", var1),
    if (object == "var2")
    {
        new JProperty("var2", var2)
    }
    );

Any help would be appreciated.

Answer 1

Yes it is. Instead of declaring the extra property in the constructor, you can optionally Add it afterwards.

string myStr = "var2";

var json = new JObject(
    new JProperty("var1", var1));
if (myStr == "var2")
{
    json.Add(new JProperty("var2", var2));
}

Answer 2

I usually do this using a Dictionary and then I allow json.net to stitch it together at the end:

var temp = new Dictionary<string,object>();
temp["var1"]=var;
if(mystr=="var2"){
   temp["var2"] = var2;
}
//serialize the dictionary using JsonConvert method once you're done