The model fails to bind when JSON is sent to the MVC controller

Question

The model fails to bind when JSON is sent to the MVC controller

I've been facing an issue with my JSON payload not getting binded in my controller. I attempted creating a class with

List<Models.UpdateChatRequestModel> Chats

, but that didn't work for me. I also tried using an array name, but that approach seemed to fail as well.

Controller:

[HttpPost]
public IActionResult UpdateChatRequest(IList<Models.UpdateChatRequestModel> request)
{
    var model = new Models.ChatModel();

    return Json(model);
}

Model:

public class UpdateChatRequestModel
{
    public int UserID
    {
        get; set;
    }

    public int LastID
    {
        get; set;
    }
}

JavaScript:

class Chat {
    constructor(UserID, LastID) {
        this.UserID = UserID;
        this.LastID = LastID;
    }
}
var chats = [new Chat(0, 1), new Chat(1, 4)];

function RequestChatUpdate() {
    $.ajax({
        type: "POST",
        url: '/Chat/UpdateChatRequest',
        data: JSON.stringify(chats),
        contentType: "application/json",
        success: function (data) {
            alert("got response from chat update");
        }
    });
}

JSON sent from RequestChatUpdate():

[{"UserID":0,"LastID":1},{"UserID":1,"LastID":4}]

javascript c#json asp.net-mvc .net-core

Answer 1

Answer №1

I've come across the solution.

To successfully update the chat request, make sure to include [FromBody] before the model parameter in the following manner:

[HttpPost]
public IActionResult ModifyChatRequest([FromBody] IList<Models.UpdateChatRequestModel> request)
{
    var d = ModelState;
    var model = new Models.ChatModel();

    return Json(model);
}

Answer 2

I've come across the solution.

To successfully update the chat request, make sure to include [FromBody] before the model parameter in the following manner:

[HttpPost]
public IActionResult ModifyChatRequest([FromBody] IList<Models.UpdateChatRequestModel> request)
{
    var d = ModelState;
    var model = new Models.ChatModel();

    return Json(model);
}

Answer 3

Answer №2

To properly structure your JSON, you must include the name as shown below:

var request = JSON.stringify({ 'request': chats });

Once this is done, your ajax request should look like this:

function RequestChatUpdate() {
    $.ajax({
        type: "POST",
        url: '/Chat/UpdateChatRequest',
        data: request,
        contentType: 'application/json; charset=utf-8',
        dataType: 'json',
        success: function (data) {
            alert("got response from chat update");
        }
    });
}

Updated

As per this resource, it is mentioned that

To bind JSON correctly in ASP.NET Core, you need to use the [FromBody] attribute on your action parameter. This instructs the framework to utilize the content-type header of the request for determining which IInputFormatters to use for model binding.

This is why adding [FromBody] is necessary.

Answer 4

To properly structure your JSON, you must include the name as shown below:

var request = JSON.stringify({ 'request': chats });

Once this is done, your ajax request should look like this:

function RequestChatUpdate() {
    $.ajax({
        type: "POST",
        url: '/Chat/UpdateChatRequest',
        data: request,
        contentType: 'application/json; charset=utf-8',
        dataType: 'json',
        success: function (data) {
            alert("got response from chat update");
        }
    });
}

Updated

As per this resource, it is mentioned that

To bind JSON correctly in ASP.NET Core, you need to use the [FromBody] attribute on your action parameter. This instructs the framework to utilize the content-type header of the request for determining which IInputFormatters to use for model binding.

This is why adding [FromBody] is necessary.

The model fails to bind when JSON is sent to the MVC controller

Answer №1

Answer №2

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