API响应问题

问题描述 投票：0回答：1

我正在制作一个 GET API，但我在 API 中定义的路线没有触发我尝试了所有方法，但它无法工作。查看我在其中添加的以下代码文件。

我已经设置了一个 GET API 端点来从数据库中获取数据，但尽管我付出了努力，它仍然没有触发。下面是相关的代码文件。我在尝试从数据库获取数据时遇到配置问题。

API 控制器文件
using API_develop.Models;
using Microsoft.Ajax.Utilities;
using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using System.Linq;
using System.Net.Configuration;
using System.Web;
using System.Web.Mvc;

namespace API_develop.Controllers
{
    public class APIController : Controller
    {

        string congemp =        ConfigurationManager.ConnectionStrings["Empconectionstring"].ConnectionString;
        // GET: API
        [HttpGet]
        [Route("API/emodata")]
        public IList<EMPdatalist> EMPdatalist()
        { 
            IList<EMPdatalist> getdata = new List<EMPdatalist>();
            {
                using (SqlConnection conn = new SqlConnection(congemp))
                {
                    using (SqlCommand cmd = conn.CreateCommand())
                    {
                        cmd.CommandText = "SELECT id, firstname, lastname, email FROM Employees";

                        SqlDataAdapter da = new SqlDataAdapter(cmd); // Associate SqlCommand with   SqlDataAdapter
                        DataTable dt = new DataTable();
                        conn.Open();
                        da.Fill(dt);

                        try
                        {
                            if (dt != null)
                            {
                                foreach (DataRow row in dt.Rows)
                                {
                                    EMPdatalist emp = new EMPdatalist();
                                    emp.Id = Convert.ToInt32(row["id"].ToString());
                                    emp.FirstName = row["firstname"].ToString();
                                    emp.LastName = row["lastname"].ToString();
                                    emp.Email = row["email"].ToString();
                                    getdata.Add(emp);
                                }
                            }
                        }
                        catch (Exception ex)
                        {
                            // Handle the exception (e.g., log it)
                            Console.WriteLine(ex.Message);
                        }
                        finally
                        {
                            conn.Close();
                        }
                    }
                }
                return getdata;
            }
        }
    }
}
API模型类
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace API_develop.Models
{
    public class EMPdatalist
    {
        public int Id { get; set; }
        public string FirstName { get; set; }
        public string LastName { get; set; }
        public string Email { get; set; }
        public string Gender { get; set; }
    }
}
路线Confiq.cs
using System.Web.Mvc;
using System.Web.Routing;

namespace API_develop
{
    public class RouteConfig
    {
        public static void RegisterRoutes(RouteCollection routes)
        {
            routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

            routes.MapRoute(
                name: "Default",
                url: "{controller}/{action}/{id}",
                defaults: new { action = "Index", id = UrlParameter.Optional }
            );
        }
    }
}
WebAPIConfig.cs 文件
using System;
using System.Web.Http;

namespace API_develop
{
    public static class WebApiConfig
    {
        public static void Register(HttpConfiguration config)
        {
            // Web API routes
            config.MapHttpAttributeRoutes();

            config.Routes.MapHttpRoute(
                name: "DefaultApi",
                routeTemplate: "api/{controller}/{action}/{id}",
                defaults: new { id = RouteParameter.Optional }
            );

            GlobalConfiguration.Configuration.Formatters.JsonFormatter.MediaTypeMappings
                .Add(new System.Net.Http.Formatting.RequestHeaderMapping("Accept",
                                     "text/html",
                                     StringComparison.InvariantCultureIgnoreCase,
                                     true,
                                     "application/json"));
        }
    }
}

我遇到的错误 api/API/emodata

API/emodata

获取数据的数据库脚本
USE [TokenAuthDB]
GO
/****** Object:  Table [dbo].[Employees]    Script Date: 7/5/2024 11:36:19 AM ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[Employees](
    [Id] [int] IDENTITY(1,1) NOT NULL,
    [FirstName] [nvarchar](max) NULL,
    [LastName] [nvarchar](max) NULL,
    [Email] [nvarchar](max) NULL,
    [Gender] [nvarchar](max) NULL,
    [CreatedDate] [datetime] NOT NULL,
 CONSTRAINT [PK_dbo.Employees] PRIMARY KEY CLUSTERED 
(
    [Id] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON, OPTIMIZE_FOR_SEQUENTIAL_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]
GO
SET IDENTITY_INSERT [dbo].[Employees] ON 

INSERT [dbo].[Employees] ([Id], [FirstName], [LastName], [Email], [Gender], [CreatedDate]) VALUES (1, N'Benjamin', N'Jones', N'[email protected]', N'Male', CAST(N'2023-06-28T00:00:00.000' AS DateTime))
INSERT [dbo].[Employees] ([Id], [FirstName], [LastName], [Email], [Gender], [CreatedDate]) VALUES (2, N'David', N'Welch', N'[email protected]', N'Female', CAST(N'2020-04-07T00:00:00.000' AS DateTime))
INSERT [dbo].[Employees] ([Id], [FirstName], [LastName], [Email], [Gender], [CreatedDate]) VALUES (3, N'Jason', N'Young', N'[email protected]', N'Male', CAST(N'2019-06-19T00:00:00.000' AS DateTime))
INSERT [dbo].[Employees] ([Id], [FirstName], [LastName], [Email], [Gender], [CreatedDate]) VALUES (4, N'Brandon', N'Oneill', N'[email protected]', N'Male', CAST(N'2021-07-21T00:00:00.000' AS DateTime))

GO
INSERT [dbo].[Employees] ([Id], [FirstName], [LastName], [Email], [Gender], [CreatedDate]) VALUES (100, N'Mark', N'Figueroa', N'[email protected]', N'Male', CAST(N'2022-11-12T00:00:00.000' AS DateTime))
SET IDENTITY_INSERT [dbo].[Employees] OFF
GO
**

我更改了路线设置，但它不起作用。请帮助我解决这个问题，以便我能理解为什么我面临这个问题。

c# asp.net runtime-error
1个回答
0
投票

我解决了这个错误，因为在 WebConfig.cs 文件中定义的路由我对代码做了一些更改，并在此处删除了一些汇编，这是此 API 的更新代码。

**APIController.cs**

using API_develop.Models;
using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using System.Web.Http;

namespace API_develop.Controllers
{
    public class APIController : ApiController
    {
        string congemp = ConfigurationManager.ConnectionStrings["Empconectionstring"].ConnectionString;

        [HttpGet]
        [Route("api/API/emodata")]
        public IList<EMPdatalist> GetEMPdatalist()
        {
            IList<EMPdatalist> getdata = new List<EMPdatalist>();
            using (SqlConnection conn = new SqlConnection(congemp))
            {
                using (SqlCommand cmd = new SqlCommand())
                {
                    cmd.Connection = conn;;
                    cmd.CommandText = "SELECT id, firstname, lastname, email FROM Employees";

                    SqlDataAdapter da = new SqlDataAdapter(cmd);
                    DataTable dt = new DataTable();
                    conn.Open();
                    da.Fill(dt);

                    try
                    {
                        if (dt != null)
                        {
                            foreach (DataRow row in dt.Rows)
                            {
                                EMPdatalist emp = new EMPdatalist
                                {
                                    Id = Convert.ToInt32(row["id"].ToString()),
                                    FirstName = row["firstname"].ToString(),
                                    LastName = row["lastname"].ToString(),
                                    Email = row["email"].ToString()
                                };
                                getdata.Add(emp);
                            }
                        }
                    }
                    catch (Exception ex)
                    {
                        // Handle the exception (e.g., log it)
                        Console.WriteLine(ex.Message);
                    }
                    finally
                    {
                        conn.Close();
                    }
                }
            }
            return getdata;
        }

}

}

**WebAPIConfig.cs**

using System;
using System.Web.Http;

namespace API_develop
{
    public static class WebApiConfig
    {
        public static void Register(HttpConfiguration config)
        {
            // Web API routes
            config.MapHttpAttributeRoutes();

            config.Routes.MapHttpRoute(
                name: "DefaultApi",
                routeTemplate: "api/{controller}/{id}",
                defaults: new { id = RouteParameter.Optional }
            );

           
        }
    }
}

通过执行此操作，API 会给出响应，现在可以正常工作了。

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