Pass array values from JavaScript to my MVC C# application

Question

I would like to pass array values from javascript to my C#.

Currently I am getting GUID null in C#. Not sure where I am doing wrong.

When I check developer tool, I have values

http://localhost/mvc/CheckData?GUID[]=C71F952E-ED74-4138-8061-4B50B9EF6463&ColumnVal=1&RowVal=1

I would like to receive this GUID value in my C# code.

JavaScript

function CheckData(obj) {
    $.ajax({
        data: {GUID:eArray, ColumnVal: $('#DisColumn').val(), RowVal: $('#DisRow').val()},
        url: "/mvc/CheckData",
                cache: false,
        success: function (result) {
         ....
        }
    });
}

C# backend code to receive values from front-end.

        public ActionResult CheckData()
        {
             var GUID = HttpContext.Request["GUID"];
            int columnVal = Convert.ToInt32(HttpContext.Request["ColumnVal"]);
            int rowVal = Convert.ToInt32(HttpContext.Request["RowVal"]);
    
            string result = (Services.CheckDataRecords(rowVal, columnVal,GUID)) ? "true" : "false";

            return Content(result);
        }

Currently, I am getting null when it hits to C# method var GUID = HttpContext.Request["GUID"];. I can see array value in front-end. But it is somehow not passing that value.

Charles Han · Accepted Answer · 2023-01-23 07:45:56Z

1

HttpContext.Request represents the request, and to access query data, you will need to do something like this: HttpContext.Request.Query["GUID"].

A more straightforward approach is to let ASP.NET do the work for you is just turn your C# backend to this:

[HttpGet("CheckData")] //change the route based on your code
public ActionResult CheckData([FromQuery] Guid[] guid, int columnVal, int rowVal)
{
    var GUIDs = guid;
    int column = columnVal;
    int row = rowVal;

    .....//your code
}

edited Jan 23, 2023 at 7:45

answered Jan 23, 2023 at 2:23

Charles Han

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