C#

Check if Integer Exists at JSON Path

Demonstrates how to get an integer value at a JSON path, and how to check to see if it exists. C#

bool success = false;

Chilkat.JsonObject json = new Chilkat.JsonObject();

//  First build simple JSON..
json.UpdateInt("test.abc",100);

json.EmitCompact = false;
Debug.WriteLine(json.Emit());

//  This is our JSON:
//  {
//    "test": {
//      "abc": 100,
//    }
//  }

string path = "test.notHere";

//  The call to IntOf will return 0, because it's not present.
//  But how do we know if it really was present, and the value was truly 0?
int val = json.IntOf(path);
Debug.WriteLine("val = " + Convert.ToString(val));

//  We cannot use LastMethodSuccess because LastMethodSuccess only applies
//  to methods that:
//  - return a string
//  - return a new Chilkat object, binary bytes, or a date/time.
//  - returns a boolean status where true = success and false = failed.
//  - returns an integer where failure is defined by a return value less than zero.
//  The IntOf method fits none of these requirements, and therefore the LastMethodSuccess 
//  is not a valid indicator..
bool wasFound = json.LastMethodSuccess;
Debug.WriteLine("wasFound = " + Convert.ToString(wasFound) + " (not a valid indicator)");

//  Instead, if the returned value is 0, we can double-check to see if the member was truly there..
if (val == 0) {
    wasFound = json.HasMember(path);
    Debug.WriteLine("wasFound = " + Convert.ToString(wasFound));
    if (wasFound == true) {
        Debug.WriteLine("The value was present and is 0.");
    }
    else {
        Debug.WriteLine("no member is present at test.notHere");
    }

}
else {
    Debug.WriteLine("val = " + Convert.ToString(val));
}

//  Alternatively, you could check to see if the member exists beforehand..
if (json.HasMember(path) == true) {
    Debug.WriteLine("val = " + Convert.ToString(json.IntOf(path)));
}
else {
    Debug.WriteLine("no member at " + path);
}