How to Correctly Pass an Array of Objects to an MVC Controller using jQuery Ajax?

Use jQuery Ajax to process object arrays in MVC (PassThing() method)

In an MVC application, passing an array of objects to a controller method using jQuery's ajax() function can be challenging. The PassThing() method expects an array of Thing objects, but the array is passed in as null.

The problem

The provided code initializes an array of Thing objects and attempts to pass it to the PassThing() method using JSON.stringify(). The error occurs because the format of the data sent to the server does not match the format expected by the PassThing() method.

Solution

To solve this problem, use JSON.stringify({ 'things': things }) to convert the array into an object with the "things" property. This object structure matches the parameters expected by the PassThing() method. The following is the modified jQuery code:

<code class="language-javascript">$(document).ready(function () {
    var things = [
        { id: 1, color: 'yellow' },
        { id: 2, color: 'blue' },
        { id: 3, color: 'red' }
    ];

    things = JSON.stringify({ 'things': things });

    $.ajax({
        contentType: 'application/json; charset=utf-8',
        dataType: 'json',
        type: 'POST',
        url: '/Xhr/ThingController/PassThing',
        data: things
    });
});</code>

Other notes

To ensure successful data delivery:

• Include contentType and dataType settings in the ajax() function.
• Correctly define the Thing class and its properties in the C# controller.
• Use the List type as the parameter of the PassThing() method.

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