System.InvalidCastException：無法在MySqlConnector.Core.Row.GetInt32（Int32序數）將VarChar轉換為Int32-有解無憂

我有一個 API，帶有一個名為 Token Controller 的控制器，它驗證用戶并提供令牌。

問題是直到現在它作業得很好，我沒有改變任何東西，所以我不知道發生了什么。請幫忙。

這是我的令牌控制器的代碼

    public TokenController(IConfiguration configuration, ICrUserInfoService crUserInfoService, IPasswordService passwordService)
    {
        _configuration = configuration;
        _crUserInfoService = crUserInfoService;
        _passwordService = passwordService;
    }

    [HttpPost]
    public async Task<IActionResult> Authentication(UserLogin login)
    {
        //if it is a valid user 
        var validation = await IsValidUser(login);
        if (validation.Item1)
        {
            var token = GenerateToken(validation.Item2);
            return Ok(new { token });
        }

        return NotFound("Unvalid User");
    }
    private async Task<(bool, CrUserInfo)> IsValidUser(UserLogin login)
    {
        var user = await _crUserInfoService.GetLoginByCredentials(login);
        bool isValid;

        if (user == null)
        {
            isValid = false;
        }
        else
        {
            isValid = _passwordService.Check(user.Password, login.Password);
        }

        return (isValid, user);

    }

    private string GenerateToken(CrUserInfo user)
    {
        //Header
        var symmetricSecurityKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(_configuration["Authentication:SecretKey"]));
        var signingCredentials = new SigningCredentials(symmetricSecurityKey, SecurityAlgorithms.HmacSha256);
        var header = new JwtHeader(signingCredentials);

        //Claims
        var claims = new[]
        {
            new Claim(ClaimTypes.Name, user.Username),
            new Claim("User", user.Displayname),
            new Claim(ClaimTypes.Role, user.Role.ToString()),
        };

        //Payload
        var payload = new JwtPayload
        (
            _configuration["Authentication:Issuer"],
            _configuration["Authentication:Audience"],
            claims,
            DateTime.Now,
            DateTime.Now.AddMinutes(30)
        );

        var token = new JwtSecurityToken(header, payload);

        return new JwtSecurityTokenHandler().WriteToken(token);
    }
}

正如我所說，到目前為止它作業得很好，這是錯誤

System.InvalidCastException: Can't convert VarChar to Int32
   at MySqlConnector.Core.Row.GetInt32(Int32 ordinal) in /_/src/MySqlConnector/Core/Row.cs:line 223
   at MySqlConnector.MySqlDataReader.GetInt32(Int32 ordinal) in /_/src/MySqlConnector/MySqlDataReader.cs:line 242
   at lambda_method23(Closure , QueryContext , DbDataReader , ResultContext , SingleQueryResultCoordinator )
   at Microsoft.EntityFrameworkCore.Query.Internal.SingleQueryingEnumerable`1.AsyncEnumerator.MoveNextAsync()
   at Microsoft.EntityFrameworkCore.Query.ShapedQueryCompilingExpressionVisitor.SingleOrDefaultAsync[TSource](IAsyncEnumerable`1 asyncEnumerable, CancellationToken cancellationToken)
   at Microsoft.EntityFrameworkCore.Query.ShapedQueryCompilingExpressionVisitor.SingleOrDefaultAsync[TSource](IAsyncEnumerable`1 asyncEnumerable, CancellationToken cancellationToken)
   at Crijoya.Infrastructure.Repositories.CrUserInfoRepository.GetLoginByCredentials(UserLogin login) in C:\Users\USER\source\repos\Api Crijoya\Crijoya.Data\Repositories\CrUserInfoRepository.cs:line 15
   at Crijoya.Core.Services.CrUserInfoService.GetLoginByCredentials(UserLogin userLogin) in C:\Users\USER\source\repos\Api Crijoya\Crijoya.Model\Services\CrUserInfoService.cs:line 20
   at Api_Crijoya.Controllers.TokenController.IsValidUser(UserLogin login) in C:\Users\USER\source\repos\Api Crijoya\Api Crijoya\Controllers\TokenController.cs:line 51
   at Api_Crijoya.Controllers.TokenController.Authentication(UserLogin login) in C:\Users\USER\source\repos\Api Crijoya\Api Crijoya\Controllers\TokenController.cs:line 40
   at Microsoft.AspNetCore.Mvc.Infrastructure.ActionMethodExecutor.TaskOfIActionResultExecutor.Execute(IActionResultTypeMapper mapper, ObjectMethodExecutor executor, Object controller, Object[] arguments)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeActionMethodAsync>g__Awaited|12_0(ControllerActionInvoker invoker, ValueTask`1 actionResultValueTask)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeNextActionFilterAsync>g__Awaited|10_0(ControllerActionInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Rethrow(ActionExecutedContextSealed context)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeInnerFilterAsync>g__Awaited|13_0(ControllerActionInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeNextExceptionFilterAsync>g__Awaited|25_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Rethrow(ExceptionContextSealed context)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeNextResourceFilter>g__Awaited|24_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Rethrow(ResourceExecutedContextSealed context)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeFilterPipelineAsync>g__Awaited|19_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope)
   at Microsoft.AspNetCore.Routing.EndpointMiddleware.<Invoke>g__AwaitRequestTask|6_0(Endpoint endpoint, Task requestTask, ILogger logger)
   at Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context)
   at Swashbuckle.AspNetCore.SwaggerUI.SwaggerUIMiddleware.Invoke(HttpContext httpContext)
   at Swashbuckle.AspNetCore.Swagger.SwaggerMiddleware.Invoke(HttpContext httpContext, ISwaggerProvider swaggerProvider)
   at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)

我不確定問題出在代碼中，因為我在幾分鐘前說過它正在作業并提供正確的令牌。請幫助我不知道如何解決這個問題。

編輯：

我的物體 CrUserInfo 的存盤庫，其中包含用戶和密碼

public CrUserInfoRepository(db_crijoyaContext context) : base(context) { }

        public async Task<CrUserInfo> GetLoginByCredentials(UserLogin login)
        {
            return await _entities.FirstOrDefaultAsync(x => x.Username == login.User);
        }

這是我的物體 CrUserInfo

public partial class CrUserInfo : BaseEntity
    {
       // public int IdUserInfo { get; set; }
        public int IdUser { get; set; }
        public string Displayname { get; set; }
        public string Username { get; set; }
        public string Password { get; set; }
        public RoleType Role { get; set; }

        public virtual CrUser IdUserNavigation { get; set; }
    }

我的 Dto 物體

public class CrUserInfoDto
    {
        public int Id { get; set; }
        public int IdUser { get; set; }
        public string Displayname { get; set; }
        public string Username { get; set; }
        public string Password { get; set; }
        public RoleType Role { get; set; }
    }

我的資料庫

System.InvalidCastException：無法在 MySqlConnector.Core.Row.GetInt32（Int32 序數）將 VarChar 轉換為 Int32

這是腳本

CREATE TABLE `cr_userInfo` (
  `id_userInfo` int(6) unsigned NOT NULL AUTO_INCREMENT,
  `id_user` int(6) unsigned NOT NULL,
  `displayname` varchar(50) NOT NULL,
  `username` varchar(50) NOT NULL,
  `password` varchar(255) NOT NULL,
  `role` varchar(30) NOT NULL,
  PRIMARY KEY (`id_userInfo`) USING BTREE,
  UNIQUE KEY `id_user` (`id_user`) USING BTREE,
  CONSTRAINT `cr_userInfo_ibfk_1` FOREIGN KEY (`id_user`) REFERENCES `cr_user` (`id_user`) ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB AUTO_INCREMENT=16 DEFAULT CHARSET=utf8

這是它停止作業之前所做的

System.InvalidCastException：無法在 MySqlConnector.Core.Row.GetInt32（Int32 序數）將 VarChar 轉換為 Int32

ONMODEL創建代碼：

modelBuilder.Entity<CrUser>(entity =>
            {
                entity.HasKey(e => e.Id)
                    .HasName("PRIMARY");

                entity.ToTable("cr_user");

                entity.HasIndex(e => e.IdCompany, "company");

                entity.Property(e => e.Id)
                    .HasColumnType("uint(6) unsigned")
                    .HasColumnName("id_user");

                entity.Property(e => e.Active)
                    .HasColumnType("tinyint(1) unsigned")
                    .HasColumnName("active")
                    .HasDefaultValueSql("'1'");

                entity.Property(e => e.IdCompany)
                    .HasColumnType("int(6) unsigned")
                    .HasColumnName("id_company");

                entity.Property(e => e.Warehouse)
                    .HasColumnType("int(6)")
                    .HasColumnName("warehouse")
                    .HasDefaultValueSql("'NULL'");

                entity.HasOne(d => d.IdCompanyNavigation)
                    .WithMany(p => p.CrUsers)
                    .HasForeignKey(d => d.IdCompany)
                    .OnDelete(DeleteBehavior.ClientSetNull)
                    .HasConstraintName("cr_user_ibfk_1");
            });

            modelBuilder.Entity<CrUserInfo>(entity =>
            {
                entity.HasKey(e => e.Id)
                    .HasName("PRIMARY");

                entity.ToTable("cr_userInfo");

                entity.HasIndex(e => e.IdUser, "id_user")
                    .IsUnique();

                entity.Property(e => e.Id)
                    .HasColumnType("uint(6) unsigned")
                    .HasColumnName("id_userInfo");

                entity.Property(e => e.Displayname)
                    .IsRequired()
                    .HasMaxLength(50)
                    .HasColumnName("displayname");

                entity.Property(e => e.IdUser)
                    .HasColumnType("int(6) unsigned")
                    .HasColumnName("id_user");

                entity.Property(e => e.Password)
                    .IsRequired()
                    .HasMaxLength(255)
                    .HasColumnName("password");

                entity.Property(e => e.Role)
                    .IsRequired()
                    .HasMaxLength(30)
                    .HasColumnName("role");

                entity.Property(e => e.Username)
                    .IsRequired()
                    .HasMaxLength(50)
                    .HasColumnName("username");

                entity.HasOne(d => d.IdUserNavigation)
                    .WithOne(p => p.CrUserInfo)
                    .HasForeignKey<CrUserInfo>(d => d.IdUser)
                    .HasConstraintName("cr_userInfo_ibfk_1");
            });

uj5u.com熱心網友回復：

您將不得不OnModelCreating從這里更新您的代碼：

entity.Property(e => e.Role)
    .IsRequired()
    .HasMaxLength(30)
    .HasColumnName("role");

表明它應該是string：

entity.Property(e => e.Role)
    .IsRequired()
    .HasMaxLength(30)
    .HasColumnName("role")
    .HasConversion<string>();

根據檔案，這應該會在資料庫varchar型別和RoleTypeC# 中自動轉換：

例如，上面使用列舉到字串的轉換作為示例，但是當提供程式型別使用以下泛型型別配置為字串時，EF Core 實際上會自動執行此操作HasConversion：

轉載請註明出處，本文鏈接：https://www.uj5u.com/houduan/458699.html

標籤：C＃ mysql 例外 jwt 视觉工作室 2019

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