更新数据库错误无法解析成员类型

Question

当我尝试在我的程序包管理器控制台上按下更新数据库时我得到这个错误

Type is not resolved for member 'Newtonsoft.Json.JsonSerializationException,Newtonsoft.Json, Version=8.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed'.

我该如何解决这个错误？我的代码是：

protected override void Seed(Gamer.DataLayer.GamerContext context)
        {
            // TODO:
            // Create a class GamerData to store a list of Games 
            // Deserialize the JSON string to a GamerData object (call this object gdata)

        var gdata = JsonConvert.DeserializeObject<GamerContext>(_json);
            Console.WriteLine(gdata.Games.Where(x => x.Language == "EN"));

            
            foreach (var game in gdata.Games)
            {

                foreach (var gameGenre in game.GameGenres)
                {
                    Genre myGenre = context.Genres.Where(g => g.GenreId == gameGenre.GenreId).FirstOrDefault();
                    if (myGenre != null)
                        gameGenre.GenreId = myGenre.GenreId;
                }
                foreach (var platformGame in game.PlatformGames)
                {
                    Platform myPlatform = context.Platforms.Where(p => p.PlatformId == platformGame.Platform.PlatformId).FirstOrDefault();
                    if (myPlatform != null)
                        platformGame.Platform = myPlatform;
                }
                context.Games.Add(game);
                context.SaveChanges();

                // Add the data to your database           
            }
        }

_json Json 是一个充满了 JSON 的字符串，其中包含我数据库的所有数据

JSON 字符串

private string _json = @"{""Games"":[
{
    ""EAN"":""2750026762618"",
    ""GameName"":""Uncharted 4"",
    ""Language"":""en|nl"",
    ""GameGenres"":
    [
        { 
            ""GameId"": ""2750026762618"",
            ""Genre"":{
                ""GenreId"":""1"",
                ""GenreName"":""Actie""}
        },
        {             
            ""GameId"": ""2750026762618"",
            ""Genre"":{
                ""GenreId"":""2"",
                ""GenreName"":""Avontuur""}
        },
        {             
            ""GameId"": ""2750026762618"",
            ""Genre"":{
                ""GenreId"":""9"",
                ""GenreName"":""Role Playing Game""}
        },
        { 
            
            ""GameId"": ""2750026762618"",
            ""Genre"":{
                ""GenreId"":""10"",
                ""GenreName"":""Shooter""}
        }
    ],
    ""PlatformGames"":
    [
        {
            ""GameId"":""2750026762618"",
            ""Platform"":{
                ""PlatformId"":""2"",
                ""PlatformName"":""Playstation 4""},                            
            ""Price"":""59.99""
        }   
    ]
},
{
    ""EAN"":""5030944112878"",
    ""GameName"":""Fifa 16"",
    ""Language"":""en"",
    ""GameGenres"":
    [
        { 
            ""GameId"": ""5030944112878"",
            ""Genre"":{
                ""GenreId"":""1"",
                ""GenreName"":""Actie""}
        },
        {             
            ""GameId"": ""5030944112878"",
            ""Genre"":{
                ""GenreId"":""12"",
                ""GenreName"":""Sport""}
        }
    ],
    ""PlatformGames"":
    [
        {
            ""GameId"":""5030944112878"",
            ""Platform"":{
                ""PlatformId"":""1"",
                ""PlatformName"":""PC""},                            
            ""Price"":""34.99""
        },
        {
            ""GameId"":""5030944112878"",
            ""Platform"":{
                ""PlatformId"":""2"",
                ""PlatformName"":""Playstation 4""},                            
            ""Price"":""39.99""
        },
        {
            ""GameId"":""5030944112878"",
            ""Platform"":{
                ""PlatformId"":""3"",
                ""PlatformName"":""Xbox One""},                            
            ""Price"":""39.99""
        } 
    ]
},
{
    ""EAN"":""5030948112294"",
    ""GameName"":""De Sims 4"",
    ""Language"":""nl"",
    ""GameGenres"":
    [
        { 
            ""GameId"": ""5030948112294"",
            ""Genre"":{
                ""GenreId"":""11"",
                ""GenreName"":""Simulatie""}
        }
    ],
    ""PlatformGames"":
    [
        {
            ""GameId"":""5030948112294"",
            ""Platform"":{
                ""PlatformId"":""1"",
                ""PlatformName"":""PC""},                            
            ""Price"":""71.08""
        }
    ]
},
{
    ""EAN"":""5030949112576"",
    ""GameName"":""Star Wars Battlefront"",
    ""Language"":""en"",
    ""GameGenres"":
    [
        { 
            ""GameId"": ""5030949112576"",
            ""Genre"":{
                ""GenreId"":""2"",
                ""GenreName"":""Avontuur""}
        },
        { 
            ""GameId"": ""5030949112576"",
            ""Genre"":{
                ""GenreId"":""10"",
                ""GenreName"":""Shooter""}
        }
    ],
    ""PlatformGames"":
    [
        {
            ""GameId"":""5030949112576"",
            ""Platform"":{
                ""PlatformId"":""1"",
                ""PlatformName"":""PC""},                            
            ""Price"":""24.99""
        },  
        {
            ""GameId"":""5030949112576"",
            ""Platform"":{
                ""PlatformId"":""2"",
                ""PlatformName"":""Playstation 4""},                            
            ""Price"":""24.99""
        },
        {
            ""GameId"":""5030949112576"",
            ""Platform"":{
                ""PlatformId"":""3"",
                ""PlatformName"":""Xbox One""},                            
            ""Price"":""34.99""
        }     
    ]
},
{
    ""EAN"":""5055856403357"",
    ""GameName"":""Doom"",
    ""Language"":""en"",
    ""GameGenres"":
    [
        { 
            ""GameId"": ""5055856403357"",
            ""Genre"":{
                ""GenreId"":""1"",
                ""GenreName"":""Actie""}
        }
    ],
    ""PlatformGames"":
    [
        {
            ""GameId"":""5055856403357"",
            ""Platform"":{
                ""PlatformId"":""1"",
                ""PlatformName"":""PC""},                            
            ""Price"":""49.99""
        },  
        {
            ""GameId"":""5055856403357"",
            ""Platform"":{
                ""PlatformId"":""2"",
                ""PlatformName"":""Playstation 4""},                            
            ""Price"":""59.99""
        },
        {
            ""GameId"":""5055856403357"",
            ""Platform"":{
                ""PlatformId"":""3"",
                ""PlatformName"":""Xbox One""},                            
            ""Price"":""59.99""
        }     
    ]
},
{
    ""EAN"":""5060146463188"",
    ""GameName"":""Minecraft Story Mode"",
    ""Language"":""nl"",
    ""GameGenres"":
    [
        { 
            ""GameId"": ""5060146463188"",
            ""Genre"":{
                ""GenreId"":""2"",
                ""GenreName"":""Avontuur""}
        }
    ],
    ""PlatformGames"":
    [
        {
            ""GameId"":""5060146463188"",
            ""Platform"":{
                ""PlatformId"":""2"",
                ""PlatformName"":""Playstation 4""},                            
            ""Price"":""30.99""
        },  
        {
            ""GameId"":""5060146463188"",
            ""Platform"":{
                ""PlatformId"":""3"",
                ""PlatformName"":""Xbox One""},                            
            ""Price"":""31.99""
        },
        {
            ""GameId"":""5060146463188"",
            ""Platform"":{
                ""PlatformId"":""4"",
                ""PlatformName"":""Wii U""},                            
            ""Price"":""39.99""
        }     
    ]
},
{
    ""EAN"":""5055856406136"",
    ""GameName"":""Fallout 4"",
    ""Language"":""en"",
    ""GameGenres"":
    [
        { 
            ""GameId"": ""5055856406136"",
            ""Genre"":{
                ""GenreId"":""1"",
                ""GenreName"":""Actie""}
        },
        { 
            ""GameId"": ""5055856406136"",
            ""Genre"":{
                ""GenreId"":""2"",
                ""GenreName"":""Avontuur""}
        },
        { 
            ""GameId"": ""5055856406136"",
            ""Genre"":{
                ""GenreId"":""5"",
                ""GenreName"":""Open wereld""}
        },
        { 
            ""GameId"": ""5055856406136"",
            ""Genre"":{
                ""GenreId"":""9"",
                ""GenreName"":""Role Playing Game""}
        },
        { 
            ""GameId"": ""5055856406136"",
            ""Genre"":{
                ""GenreId"":""10"",
                ""GenreName"":""Shooter""}
        }
    ],
    ""PlatformGames"":
    [
        {
            ""GameId"":""5055856406136"",
            ""Platform"":{
                ""PlatformId"":""1"",
                ""PlatformName"":""PC""},                            
            ""Price"":""114.4""
        },  
        {
            ""GameId"":""5055856406136"",
            ""Platform"":{
                ""PlatformId"":""2"",
                ""PlatformName"":""Playstation 4""},                            
            ""Price"":""264.99""
        },
        {
            ""GameId"":""5055856406136"",
            ""Platform"":{
                ""PlatformId"":""3"",
                ""PlatformName"":""Xbox One""},                            
            ""Price"":""114.99""
        }     
    ]
}
]
}";

有人知道我做错了什么吗？

GamerContext

using Gamer.DomainClasses.Models;
using System;
using System.Collections.Generic;
using System.Data.Entity;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

    namespace Gamer.DataLayer
    {
        public class GamerContext : DbContext
        {
            public GamerContext() : base("Gamer")
            { }
            public DbSet<Game> Games { get; set; }
            public DbSet<Genre> Genres { get; set; }
            public DbSet<PlatformGames> PlatformGames { get; set; }
            public DbSet<Platform> Platforms { get; set; }
            public DbSet<GameGenres> GameGenres { get; set; }
    
        }
    }

Answer 1

您的 JSON 可能有一些与您的 class 不同的属性（不同的名称、类型等...）。

提示：如果您想调试 Seed，您需要通过代码启动调试器：

protected override void Seed(dbEmployeePortal context)
{
    try
    {
        if(!Debugger.IsAttached)
            Debugger.Launch()
    }
    catch(Exception e)
    { // breakpoint here. This breakpoint needs to be set on the new visual studio that will open for the debug session.

    }
}

更新数据库错误无法解析成员类型

Error on update-database Can't resolve Type for member

c#

json

entity-framework-migrations