Conversion of object to multiple dimensional array

Question

I am passing multidimensional array in web method as object type. I want to convert this object type to multiple array in the method.

The method, which does the conversion:

[WebMethod]
public static string Save(object arr)
{
  Dictionary<string, object> value = (Dictionary<string, object>)arr;
  return ""; 
}

The client-side code:

//ajax method
var arr=new Array();

 var table = document.getElementById('table');
    for (var r = 0, n = table.rows.length; r < n; r++) {
        arr[r] = new Array(10);
        for (var c = 0, m = table.rows[r].cells.length; c < m; c++) {
            arr[r][c]=table.rows[r].cells[c].innerHTML;
        }
    }
    console.log(arr);
  $.ajax({
    type: "POST",
    dataType: "json",
    contentType: "application/json",
    url: "salary.aspx/Save",
    data: JSON.stringify({ arr: arr }),
    success: function (response) {
        alert(response.d);            
    }
});

The error message is:

Unable to cast object of type 'System.Object[]' to type 'System.Collections.Generic.Dictionary`2[System.Object,System.Object]'.

You wont be able to directly cast it. Try looping and iterating over individual items. — Dhrumil
– Dhrumil, Commented Apr 28, 2015 at 10:50

jamespconnor · Accepted Answer · 2015-04-28 11:54:37Z

1

First of all you need to create your inner array differently:

//ajax method
var arr=new Array();

 var table = document.getElementById('table');
    for (var r = 0, n = table.rows.length; r < n; r++) {
        arr[r] = {};
        for (var c = 0, m = table.rows[r].cells.length; c < m; c++) {
            arr[r][c]=table.rows[r].cells[c].innerHTML;
        }
    }
    console.log(arr);
  $.ajax({
    type: "POST",
    dataType: "json",
    contentType: "application/json",
    url: "salary.aspx/Save",
    data: JSON.stringify({ arr: arr }),
    success: function (response) {
        alert(response.d);            
    }
});

Then you should be able to do something like this:

[WebMethod]
public static string Save(object arr)
{
    object[] table = (object[])arr;

    // now the the object contains all your row values as an object.

    return ""; 
}

answered Apr 28, 2015 at 11:54

jamespconnor

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1 Comment

jamespconnor Over a year ago

This code is untested, but the stringify should be putting a single dimensional array down with each row represented as an object.

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