How to return a JavaScript 'native' array from a C# method?

StackOverflow https://stackoverflow.com/questions/647696

Question

I'm trying to call a C# method from JavaScript by using ActiveXObject:

var myobj = new ActiveXObject('myobject');
var arr = myobj.GetArray();

Eventually, arr will contain a SAFEARRAY object, but not JScript array. Is there any way to return native JavaScript object from a C# method?

Was it helpful?

Solution 2

I found the solution by myself, but no documentation exists for this part. The solution is to use JScript.ArrayObject in the following way:

ArrayObject _lastField;
byte[] byteArray = new byte[]{2,1,2,3};
object[] array = new object[byteArray.Length];
byteArray.CopyTo(array, 0);
_lastField = Microsoft.JScript.GlobalObject.Array.ConstructArray(array);

After that you will be able to use the _lastField array in JavaScript like a native array:

var myobj = new ActiveXObject('myobject');
var arr = myobj.LastField;
alert(arr[1]);

OTHER TIPS

You can return a JSON string and then parse into a JavaScript object. There are a number of .NET libraries available to serialize .NET objects into JSON and vice-versa-

to name a few.

This question and answer may be of use to you

You may return delimited Joined String in C# and can split into JavaScript 

//C#
public string getArryString()
{
string[] arrstring = new string[]{"1","2","3"};
return string.Join(",", arrstring);
}

//Javascript
var arrstring = objActiveX.getArryString().split(',');

Via VBArray it can work like this:

  1. Return object[] from C# (declare so in the dispinterface).

  2. To get a native JS array in JScript use VBArray: 

    var jsArray = new VBArray(myobj.GetArray()).toArray();
for (i = 0; i < jsArray.length; i++) 
{
   // use jsArray[i]
}

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