Postgres .NET core 3.1 web api, npgsql, 无法使用 POST 方法

Question

我运行遇到了问题。我有 .net core 3.1 web api 可以成功地使用 GET 方法从 postgres 本地主机获取参与者 table 数据，但我不能使用 POST 方法。 Postman 抛出错误““参数‘@FirstName’必须设置其值””，尽管给它非空输入。我不确定问题是我没有正确使用邮递员还是 C# 代码错误。我是 .NET core 3.1 的新手，所以非常欢迎任何帮助。

参加者table：

-- Table: public.Participant

-- DROP TABLE IF EXISTS public."Participant";

CREATE TABLE IF NOT EXISTS public."Participant"
(
    "Id" integer NOT NULL,
    "First Name" character varying COLLATE pg_catalog."default" NOT NULL,
    "Last Name" character varying COLLATE pg_catalog."default" NOT NULL,
    "Date Of Birth" date,
    "Sex" character varying COLLATE pg_catalog."default",
    CONSTRAINT "Participant_pkey" PRIMARY KEY ("First Name", "Last Name"),
    CONSTRAINT "Id" UNIQUE ("Id")
)

TABLESPACE pg_default;

ALTER TABLE IF EXISTS public."Participant"
    OWNER to postgres;

Post方法：


using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Configuration;
using Npgsql;
using Assignment.Models;
using System;
using System.Data;

namespace Assignment.Controllers
{
    [Route("api/[controller]")]
    [ApiController]
    public class ParticipantController : ControllerBase
    {
        private readonly IConfiguration _configuration;
        private readonly IWebHostEnvironment _env;
        public ParticipantController(IConfiguration configuration, IWebHostEnvironment env)
        {
            _configuration = configuration;
            _env = env;
        }

        [HttpGet]
        public JsonResult Get()
        {
            string query = @"
                select * from ""Participant""
            ";

            try
            {
                //create datatable and configuration stirng
                DataTable table = new DataTable();
                string sqlDataSource = _configuration.GetConnectionString("ParticipantConnectionString");

                //initialize npgsql reader
                NpgsqlDataReader myReader;
                using (NpgsqlConnection myCon = new NpgsqlConnection(sqlDataSource))
                {
                    myCon.Open();

                    //create command from given query and connection
                    using (NpgsqlCommand myCommand = new NpgsqlCommand(query, myCon))
                    {
                        myReader = myCommand.ExecuteReader();
                        table.Load(myReader);

                        myReader.Close();
                        myCon.Close();

                    }
                }

                return new JsonResult(table);
            }
            catch (Exception e)
            {
                return new JsonResult(e);
            }
            
        }


        [HttpPost]
        public JsonResult Post(Participant participant)
        {
            string query = @"
                insert into ""Participant"" 
                (""Id"", ""First Name"", ""Last Name"", ""Date Of Birth"", ""Sex"")
                values (@Id,@FirstName,@LastName,@DateOfBirth,@Sex) 
            ";

            //create datatable and configuration stirng
            DataTable table = new DataTable();
            string sqlDataSource = _configuration.GetConnectionString("ParticipantConnectionString");

            //initialize npgsql reader
            NpgsqlDataReader myReader;

            try
            {
                using (NpgsqlConnection myCon = new NpgsqlConnection(sqlDataSource))
                {
                    myCon.Open();
                    using (NpgsqlCommand myCommand = new NpgsqlCommand(query, myCon))
                    {

                        myCommand.Parameters.AddWithValue("@Id", participant.Id);
                        myCommand.Parameters.AddWithValue("@FirstName", participant.FirstName);
                        myCommand.Parameters.AddWithValue("@LastName", participant.LastName);
                        myCommand.Parameters.AddWithValue("@DateOfBirth", Convert.ToDateTime(participant.DateOfBirth));
                        myCommand.Parameters.AddWithValue("@Sex", participant.Sex);

                        //myCommand.Parameters.AddWithValue("@PhotoFileName", participant.PhotoFileName);

                        myReader = myCommand.ExecuteReader();
                        table.Load(myReader);

                        myReader.Close();
                        myCon.Close();

                    }
                }

                return new JsonResult("Added Successfully");
            }
            catch (Exception e)
            {

                return new JsonResult(e);
            }
            
        }
    }
}

参加者class：


public class Participant
{
    public int Id { get; set; }

    public string FirstName { get; set; }
    public string LastName { get; set; }

    public string DateOfBirth { get; set; }

    public string Sex { get; set; }

}

Answer 1

您正在发送 "First Name"（带有 space），但您的模型包含 "FirstName"（没有 space）

您可以修改您 post 的内容（删除 space），或者指示您的模型接受对包含 space 的参数的绑定（请参阅 doc)

[FromQuery(Name = "First Name")]
public string FirstName { get; set; }

Postgres .NET core 3.1 web api, npgsql, 无法使用 POST 方法

Postgres .NET core 3.1 web api, npgsql, cannot use POST method

postgresql

postman