Question

我有一个REST API控制器配置如下。在按钮上单击“PlayersRegistration”，javascript中的更新功能称为prorperly。但问题是DefaultController类中的PostPlayers方法永远不会使用success：function（data）语句在update函数中调用。相反，当我通过检查元素检查浏览器中的控制台时，我看到内部服务器错误500.我不知道什么是错的。

using System;
using System.Collections.Generic;
using System.Linq;   
using System.Net;
using System.Net.Http;  
using System.Web.Http;

namespace WebApplication2.Models
{
  public class Default : ApiController
  {
    public string regID { get; set; }
    public string firstName { get; set; }
    public string lastName { get; set; }
    public string teamName { get; set; }
    public DateTime dateOfBirth { get; set; }

  }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Web.Http;
using WebApplication2.Models;
using System.IO;
using System.Globalization;
using System.Windows.Forms;
namespace WebApplication2.Controllers
{
 public class DefaultController : ApiController
 {
    List<Default>players = new List<Default>();
    string path = Path.Combine(Directory.GetCurrentDirectory(), "\\players.txt");

    public void readFile() 
    {
        string line;
        StreamReader file = new StreamReader(path);
        string[] data;
        players.Clear();

        while ((line = file.ReadLine()) != null)
        {
            data = line.Split(',');
            Default player = new Default();
            player.regID = data[0];
            player.firstName = data[1];
            player.lastName = data[2];
            player.teamName = data[3];
            player.dateOfBirth = DateTime.ParseExact(data[4],
                "yyyy-mm-dd", CultureInfo.InvariantCulture);
            players.Add(player);
        }
        file.Close();
    }

    public IHttpActionResult PostPlayers(Default playerInfo)
    {
        readFile();
        MessageBox.Show("5");
        var player = players.FirstOrDefault((p) => p.regID == playerInfo.regID);
        if (player != null)
        {
            players.Remove(player);
            players.Add(playerInfo);
        }

        else
        {
            players.Add(playerInfo);
        }

        using (StreamWriter sw = File.CreateText(path))
        {
            for (int i = 0; i < players.Count(); i++)
                sw.WriteLine(Players_Display(players[i]), Environment.NewLine);
            sw.Close();
        }

        return Ok(players);
    }

    public string Players_Display(Default player)
    {
        string data = player.regID + "," + player.firstName + "," + player.lastName + "," + player.teamName + "," + player.dateOfBirth.ToString("yyyy-mm-dd").Substring(0,10);
        return data;
    }

   }
}

HTML代码如下

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
  <title></title>
</head>
<body>
 <div>
    <h2> All Players</h2>
    <ul id="players"></ul>

 </div>

 <div>
    <br />
    <h2> Search or Delete </h2>
    <select id="options_for_search_delete">
        <option value="id">ID</option>
        <option value="name">Name</option>
    </select>
    <input type="text" id="data" size="5" />
    <input type="button" value="Search" onclick="search()" />
    <input type="button" value="Delete" onclick="delet()" />
    <br />
    <p id="result_players" /><br>
    <h2>Player Registration</h2>
    <br />
    <form>
        <label for="id"> RegistrationID:</label><br>
        <input type="text" id="regID" name="regID">
        <br />
        <label for="firstName">First Name:</label><br>
        <input type="text" id="firstName" name="firstName">
        <br />
        <label for="lastName">Last Name:</label><br>
        <input type="text" id="lastName" name="lastName">
        <br />
        <label for="teamName">Team Name:</label><br>
        <input type="text" id="teamName" name="teamName">
        <br />
        <label for="dateofbirth">Date Of Birth:</label><br>
        <input type="text" id="dateOfBirth" name="dateOfBirth">
        <br />
        <input type="button" id="post" value="Player Registration" onclick="update();" />
        <p id="data_validation"></p>
    </form>

 </div>

 <script src="http://ajax.aspnetcdn.com/ajax/jQuery/jquery-2.0.3.min.js"></script>
 <script>

    var uri = 'api/Default';

    $(document).ready(function () {

        $.ajax({
            type: 'GET',
            url: uri,
            success: function (data) {
                displayData(data);
            }
        })
    })

    function format(item) {
        return item.regID + "," + item.firstName + " " + item.lastName + "," + item.teamName + "," + item.dateOfBirth.toString().substring(0, 10);
    }

    function displayData(data) {
        $('ul').empty(); 
        $.each(data, function (key, item) {
            $('<li>', { text: format(item) }).appendTo($('#players'));
        });
    }



    function update() {

        $('#result_players').text("");
        $('#data_validation').text("");
        if ($('#regID').val() == "" || $('#firstName').val() == "" || $('#lastName').val() == "" || $('#teamName').val() == "" || $('#dateofbirth').val() == "") {
            $('#data_validation').text("Input Boxes Cannot be Empty");
        }
        else {
            $.ajax({
                type: 'POST',
                url: uri,
                data: String($('form').serialize()),
                success: function (data) {
                    displayData(data);
                },
                error: function (jqXHR, textStatus, err) {
                    alert(err);
                }
            })
        }
    }
  </script>
 </body>
</html>

Answer 1

“500内部服务器错误”表示“服务器遇到意外情况，导致无法完成请求。”

所以，你的javascript可能很好，但服务器端无法执行请求，并且永远不会调用成功回调。

您必须检查服务器的日志，以获取有关根本原因的线索。

AJAX查询不调用REST API控制器方法

1 个答案: