我曾经遇到过类似的情况，我想使用ASMX(ASP.NET Web服务)将数据从后端发送到前端，但多次失败，因为前端无法达到我打算发送的文件格式。即使在后端添加了断点，也没有用。因此，我没有将后端数据转换为HTTP请求，而是将其转换为JSON。这是我的代码，我想它可能会对你有帮助。
这是我在索引顶部的视图，您可以看到使用Anularjs创建的服务，它将json加载到我们的模型中，当我们使用Angular 模型和控制器时，我们将看到这一点
这是位于本答案末尾的ASP.NET MVC控制器的视图，它应该位于视图/Shared/_Layout中

@model string

@{
    ViewBag.Title = "employee_data";
    Layout = "~/Views/Shared/_Layout.cshtml";
}

<h2>employee_data</h2>

@section javascriptInHead{
    <script src="~/Scripts/SinglePageApplication.js"></script>
    <script type="text/javascript">
        myModel.factory('bootstrapeddataemployee', function () {
            return {
                employee:@Html.Raw(Model)
        };
        }
            );
    </script>
}

<div ng-controller="employeeController">
    @*{{employees}}*@
    <table>
        <thead>
            <tr>
                <th>EmployeeId</th>
                <th>
                    EmployeeName
                </th>
                <th>
                    EmployeeGender
                </th>
                <th>
                    EmployeeSalary
                </th>
            </tr>
        </thead>
        <tbody>
            <tr ng-repeat="employee in employees">
                <td>
                    {{employee.id}}
                </td>
                <td>
                    {{employee.name}}
                </td>
                <td>
                    {{employee.gender}}
                </td>
                <td>
                    {{employee.salary}}
                </td>
            </tr>
        </tbody>
    </table>
    <div class="buttonstyler">
    <input type="button" value="GoToEmployees" class="custom-btn btn-1"  onclick="location.href='@Url.Action("Index", "Home")'" />
</div>
   </div>

以下是用于此操作的angularjs模型和控制器

var myModel = angular.module("myModel", []);
myModel.controller("employeeController", function ($scope, bootstrapeddataemployee) {
    $scope.employees = bootstrapeddataemployee.employee;
}
);

不要忘记在配置文件中添加连接字符串。
下面是我的asmx Web服务，我用它将服务转换为一个字符串，该字符串位于MVC的Models部分，因此为了访问这个int控制器，我们需要在控制器的顶部引用这个模型的名称空间，如下所示

using CoursesMVC.Models;

/*this is referencing and public down can be added just above the controller for more details look to the controller seciton of the answer.*/

  public CoursesMVC.Models.courses data = new CoursesMVC.Models.courses();/

using CoursesMVC.Controllers;
using System.Web.Script.Serialization;
using System.Configuration;
using Newtonsoft.Json;
using Newtonsoft.Json.Serialization;

namespace CoursesMVC.Models
{
    /// <summary>
    /// Summary description for courses
    /// </summary>
    [WebService(Namespace = "http://tempuri.org/")]
    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
    [System.ComponentModel.ToolboxItem(false)]
    // To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line. 
     [System.Web.Script.Services.ScriptService]
    public class courses : System.Web.Services.WebService
    {

        [WebMethod]
                public string GetAllEmployees()
        {
            List<Employee> listEmployees = new List<Employee>();

            string cs = ConfigurationManager.ConnectionStrings["DBCS"].ConnectionString;
            using (SqlConnection con = new SqlConnection(cs))
            {
                SqlCommand cmd = new SqlCommand("Select * from tblEmployees", con);
                con.Open();
                SqlDataReader rdr = cmd.ExecuteReader();
                while (rdr.Read())
                {
                    Employee employee = new Employee();
                    employee.id = Convert.ToInt32(rdr["Id"]);
                    employee.name = rdr["Name"].ToString();
                    employee.gender = rdr["Gender"].ToString();
                    employee.salary = Convert.ToInt32(rdr["Salary"]);
                    listEmployees.Add(employee);
                }
            }

            JavaScriptSerializer js = new JavaScriptSerializer();
            var settings = new JsonSerializerSettings { ContractResolver = new CamelCasePropertyNamesContractResolver() };
            //return Context.Response.Write(js.Serialize(listEmployees));
            return JsonConvert.SerializeObject(listEmployees, Formatting.None, settings);

        }

    }
}

最后，我使用的MVC控制器使用view(“view name”，“”，返回STRING_DATA的函数)将转换为STING的json注入到视图中；

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using Newtonsoft.Json;
using Newtonsoft.Json.Serialization;
using CoursesMVC.Models;

namespace CoursesMVC.Controllers
{

    public class HomeController : Controller
    {

     public CoursesMVC.Models.courses data = new CoursesMVC.Models.courses();

      public ActionResult employee_data()
            {
            string emp_data = data.GetAllEmployees();
            return View("employee_data","",emp_data);
            }
    }
}

希望你能得到你想要的答案。如果这让我感到困惑，我会更容易用文字，而不是写在这里。

1.请始终创建新连接。.NET正在进行连接池。
1.数据读取后关闭Connection、Reader和Dispose命令。
1.为什么不使用实体框架来处理SQL注入之类的安全问题？