如何使用.net core和neo4j进行Post操作

Question

我是.Net Core和Neo4j的新手。我想使用Neo4jClient为CRUD操作制作Wep Api。我有一个Book类及其控制器。我还有Author和它的控制器类。我想制作Post操作，但我不能。邮差返回BadRequest（）。那我怎么解决这个问题呢？问题是什么？

以下是Book.cs的源代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace NEO4j.Models
{
    public class Book
    {

        public int Id { get; set; }
        public string Title { get; set; }
        public List<string> CategoryCodes { get; set; }
    }
}

BookController.cs

using Microsoft.AspNetCore.Mvc;
using NEO4j.Models;
using NEO4j.Services;
using Neo4jClient;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Threading.Tasks;

namespace NEO4j.Conrollers
{
    [Route("api/book")]
    public class BookController : Controller
    {
        private static int uniqueId=1;
        public string title { get; set; }
        public List<string> category { get; set; }

        private static BookService bookService;
        private static CategoryService categoryService;

        static BookController()
        {
            bookService = new BookService();
            categoryService = new CategoryService();
        }

        [HttpGet]
        public ActionResult Get()
        {
            var graphClient = new GraphClient(new Uri("http://localhost:7474/db/data"), "neo4j", "1234");
            graphClient.Connect();

            var data = graphClient.Cypher
               .Match("(m:Book)")
               .Return<Book>("m")
               .Results.ToList();

            return Ok(data.Select(c => new { book = c }));
        }


        [HttpPost]
        public ActionResult Post([FromBody] Book book) {

            var client = new GraphClient(new Uri("http://localhost:7474/db/data"), "neo4j", "1234");
            client.Connect();


            if (book == null)
                return BadRequest();

            if (!ModelState.IsValid)
                return BadRequest(ModelState);

            var newBook = new Book { Id = uniqueId, Title = title, CategoryCodes = category };
            client.Cypher
                .Merge("(book:Book { Id: {uniqueId} ,Title:{title},CategoryCodes:{category}})")
                .OnCreate()
                .Set("book = {newBook}")
                .WithParams(new
                {
                    uniqueId =newBook.Id,
                    title = newBook.Title,
                    category = newBook.CategoryCodes,
                    newBook
                })
                .ExecuteWithoutResults();

             uniqueId++;
             return Ok(newBook);
        }

    }
}

Answer 1

仅适用于ASP.Net核心部分：

  

localhost：63654 / api / book {“Title”：“Deep Learning”，“CategoryCodes”：“5”}

     

book为空

1. 如何提出您的请求（在您的情况下，Postman）很重要 - 这就是我要求您提供的原因。所以Headers等等很重要。

   通过邮递员发送JSON：

   POST /api/test HTTP/1.1
   Host: localhost:63654
   Content-Type: application/json       
   Cache-Control: no-cache
   Postman-Token: 51081616-c62d-c677-b5ab-37d428018db5
   
   {"Title":"Deep Learning", "CategoryCodes": ["1","2","3"]}
   

   请注意Content-Type标题

我们的CategoryCodes模型中的

2. Book为List，因此您必须为其值设置“列表”（数组），如上所示"CategoryCodes": ["1","2","3"]

H个..