我已经使用带有MVC模式的ASP.Net Core 3.1创建了一个全新的Visual Studio 2019 Web应用程序。
我的控制器有一个HttpPost方法,该方法应该有一个传入的Json对象(我将[FromBody]用作传入的参数)。
无论我尝试什么,传入的参数始终为Null。我尝试将参数更改为字符串,并将Model修改为一个简单的3字段类,但它仍为null。
我使用Chrome的开发人员工具来确保我的页面从JavaScript Post回调正确发送了Json对象(并且还使用Postman进行了相同操作),结果相同:我的参数仍然为Null。
我需要怎么做才能使参数作为实际值输入?
我的控制器:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using microsoft.AspNetCore.Mvc;
using Newtonsoft.Json;
using canvasApiLib.API;
using CanvasGrades.Models.AuxiliaryModels;
namespace CanvasGrades.Controllers
{
public class FinalGradeController : Controller
{
public async Task<IactionResult> Index()
{
// Course Name
dynamic courseDetails = await clsCoursesApi.getcourseDetails(accessToken,apiUrl,canvasCourseId);
ViewData["CourseName"] = courseDetails.name;
// Course Term
dynamic courseTerm = await clsEnrollmentTermsApi.getEnrollmentTerm(accessToken,canvasaccountID,termNum);
ViewData["CourseTerm"] = courseTerm.name;
return View();
}
[HttpPost]
public async Task<IactionResult> LoadTable([FromBody]DTParameters dtParameters)
{
//DTParameters dtParameters = new DTParameters();
if (dtParameters == null)
{
dtParameters = new DTParameters();
}
}
}
}
我的DTParameters模型:
public class DTParameters
{
public int Draw { get; set; }
public DTColumn[] Columns { get; set; }
public DTOrder[] Order { get; set; }
public int Start { get; set; }
public int Length { get; set; }
public DTSearch Search { get; set; }
public IEnumerable<string> AdditionalValues { get; set; }
}
我看到的大多数示例都说明要对应用程序进行调整。在Startup.cs文件的Configure调用中使用UseMVC实例化,但是我的实例却没有:
// This method gets called by the runtime. Use this method to add services to the container.
public void ConfigureServices(IServiceCollection services)
{
services.AddDistributedMemoryCache();
services.AddControllersWithViews();
}
// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
public void Configure(IApplicationBuilder app,IWebHostEnvironment env)
{
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
}
else
{
app.UseExceptionHandler("/Home/Error");
// The default HSTS value is 30 days. You may want to change this for production scenarios,see https://aka.ms/aspnetcore-hsts.
app.UseHsts();
}
app.UseHttpsRedirection();
app.UseStaticfiles();
app.UseRouting();
app.UseAuthorization();
app.UseEndpoints(endpoints =>
{
endpoints.MapControllerRoute(
name: "default",pattern: "{controller=Home}/{action=Index}/{id?}");
});
}
(添加)
{"draw":1,"columns":[{"data":"studentName","name":"","searchable":true,"orderable":true,"search":{"value":"","regex":false}},{"data":"studentEMail",{"data":null,{"data":"finalGrade",{"data":"lastAttendDate",{"data":"bannerID",{"data":"crn","regex":false}}],"order":[{"column":0,"dir":"asc"}],"start":0,"length":10,"regex":false}}
我再次重试了我的简单参数,注意到我发送的原始ID字段是一个整数,但是当我将其设为字符串(如模型所示)时,它没有问题。
public class SimpleParam
{
public string Id { get; set; }
public string Name { get; set; }
public string Foo { get; set; }
}
{"id": "1","name": "fred","foo": "bob"}
所以,这意味着我将不得不弄清楚DTParameters模型出了什么问题。