为什么在 ASP.NET Core 中将带 Ajax 的参数传递给控制器始终为 NULL？

Question

它有效，但传递的参数始终为空，此代码在 ASP.NET Framework（.Net Framework）上的我的其他项目中有效，但在 ASP.NET Core 中无效。

var inputParams = "{namex: '" + 'testdata' + "'}";

var xhr = $.ajax({
    url: "/Test/MyFunction",
    type: 'POST',
    dataType: 'json',
    data: inputParams,
    contentType: 'application/json; charset=utf-8',
    success: function (msg) {

    },
    error: function (xhr) {

    }
});

测试控制器包含：

   [HttpPost]
   public JsonResult MyFunction(string namex) <--- namex is always NULL
    {
        return Json(false);
    }

Answer 1

将 FromBodyAttribute 添加到参数

MyFunction([FromBody] 字符串名称 x)

Answer 2

数据未以正确的格式发送，内容无法正确绑定到操作

先正确构造要发布的payload

var inputParams = { namex: "testdata" }; //<-- NOTE JavaScript

var xhr = $.ajax({
    url: "/Test/MyFunction",
    type: 'POST',
    dataType: 'json',
    data: JSON.stringify(inputParams), //<-- NOTE CONVERSION TO JSON
    contentType: 'application/json; charset=utf-8',
    success: function (msg) {

    },
    error: function (xhr) {

    }
});

接下来创建一个模型来保存服务器端的数据

public class MyModel {
    public string namex { get; set;}
}

最后重构操作以绑定到请求正文中的预期数据

[HttpPost]
public IActionResult MyFunction([FromBody]MyModel model) {
    if(ModelState.IsValid) {
        string namex = model.namex;
        return Ok();
    }
    return BadRequest(ModelState);
}

引用Model Binding in ASP.NET Core

Answer 3

刚刚发送，没有对象

var inputParams = 'testdata';

var xhr = $.ajax({
    url: "/Test/MyFunction",
    type: 'POST',
    dataType: 'json',
    data: inputParams,
    contentType: 'application/json; charset=utf-8',
    success: function (msg) {

    },
    error: function (xhr) {

    }
});

或


var xhr = $.ajax({
    url: "/Test/MyFunction?namex=testdata", // <------ here
    type: 'POST',
    dataType: 'json',
    contentType: 'application/json; charset=utf-8',
    success: function (msg) {

    },
    error: function (xhr) {

    }
});

为什么在 ASP.NET Core 中将带 Ajax 的参数传递给控制器始终为 NULL？

Why passed param with Ajax to controller in ASP.NET Core is always NULL?

c#

asp.net-ajax

parameter-passing

asp.net-core

为什么在 ASP.NET Core 中将带 Ajax 的参数传递给控制器​​始终为 NULL？

Why passed param with Ajax to controller in ASP.NET Core is always NULL?

c#

asp.net-ajax

parameter-passing

asp.net-core

为什么在 ASP.NET Core 中将带 Ajax 的参数传递给控制器始终为 NULL？