使用“FromSqlRaw”命令調用存儲過程返回錯誤

Question

我在類似的問題中看到了這個錯誤，但這是我第一次嘗試.Net Core，我想確保我的 c# 代碼不是罪魁禍首。 通過FromSqlRaw命令調用存儲過程時出現錯誤。 我確認我正在向FromSqlRaw命令發送正確的值，但錯誤是在抱怨一個鍵？

請看下面的代碼：

Controller

public class HomeController : Controller
{
    private IStudent _info;

    private readonly StudentInformation _studentInformation;

    public HomeController(IStudent info)
    {
        _info = info;
    }

    //public async Task<IActionResult> Index([FromQuery] Student student)
    public IActionResult Index([FromQuery] Student student)
    {
        int id = student.Id;

        if (id == 0) 
        {
            return NotFound(); 
        }

        var model = _info.GetById(id);

        return View(model);
    }
}

學生 Class

public class Student
{
    public int Id_Num { get; set; }

    public string StudentName { get; set; }
    public string PreferredName { get; set; }
    public string Gender { get; set; }

    public string DOB { get; set; }
    public string Resident { get; set; }

    public string F1Visa { get; set; }
    public string Division { get; set; }
    public string Tuition { get; set; }
    public string cohort { get; set; }
    public string Ferpa { get; set; }
} 

public class StudentInformationService : IStudent
{
    private StudentInfo _info;

    public StudentInformationService(StudentInfo info)
    {
        _info = info;
    }

    public IEnumerable<Student> GetAll()
    {
        throw new NotImplementedException();
    }

    public Student GetById(int id)
    {
        return _info.StudentRow
                   .FromSqlRaw("StudentRegistrationInfo @IdNum, @OldIdNum", 
                               new SqlParameter("IdNum", id),
                               new SqlParameter("OldIdNum", id))
                   .AsEnumerable().FirstOrDefault();
    }
}

這是錯誤：

InvalidOperationException：實體類型“學生”需要定義主鍵。 如果您打算使用無密鑰實體類型，請調用“HasNoKey()”。

Microsoft.EntityFrameworkCore.Infrastructure.ModelValidator.ValidateNonNullPrimaryKeys（IModel model，IDiagnosticsLogger 記錄器）

Microsoft.EntityFrameworkCore.Infrastructure.ModelValidator.Validate（IModel model，IDiagnosticsLogger 記錄器）

Microsoft.EntityFrameworkCore.Infrastructure.RelationalModelValidator.Validate（IModel model，IDiagnosticsLogger 記錄器）

Microsoft.EntityFrameworkCore.SqlServer.Internal.SqlServerModelValidator.Validate（IModel model，IDiagnosticsLogger 記錄器）

Microsoft.EntityFrameworkCore.Metadata.Conventions.Internal.ConventionDispatcher+ImmediateConventionScope.OnModelFinalized(IConventionModelBuilder modelBuilder)

Microsoft.EntityFrameworkCore.Metadata.Internal.Model.FinalizeModel()

Microsoft.EntityFrameworkCore.Infrastructure.ModelSource.GetModel（DbContext 上下文，IConventionSetBuilder 約定SetBuilder）

Microsoft.EntityFrameworkCore.Internal.DbContextServices.CreateModel()

Microsoft.EntityFrameworkCore.Internal.DbContextServices.get_Model()

Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitFactory（FactoryCallSite factoryCallSite，RuntimeResolverContext 上下文）

Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor.VisitCallSiteMain（ServiceCallSite callSite，TArgument 參數）

Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitCache（ServiceCallSite callSite，RuntimeResolverContext 上下文，ServiceProviderEngineScope serviceProviderEngine，RuntimeResolverLock lockType）

Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitScopeCache（ServiceCallSite singletonCallSite，RuntimeResolverContext 上下文）

Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor.VisitCallSite（ServiceCallSite callSite，TArgument 參數）

Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitConstructor（ConstructorCallSite constructorCallSite，RuntimeResolverContext 上下文）

Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor.VisitCallSiteMain（ServiceCallSite callSite，TArgument 參數）

Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitCache（ServiceCallSite callSite，RuntimeResolverContext 上下文，ServiceProviderEngineScope serviceProviderEngine，RuntimeResolverLock lockType）

Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitScopeCache（ServiceCallSite singletonCallSite，RuntimeResolverContext 上下文）

Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor.VisitCallSite（ServiceCallSite callSite，TArgument 參數）

Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.Resolve（ServiceCallSite callSite，ServiceProviderEngineScope 范圍）

Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService（IServiceProvider 提供程序，類型 serviceType）

Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService（IServiceProvider 提供程序）

Microsoft.EntityFrameworkCore.DbContext.get_DbContextDependencies()

Microsoft.EntityFrameworkCore.DbContext.get_InternalServiceProvider()

Microsoft.EntityFrameworkCore.DbContext.get_DbContextDependencies()

Microsoft.EntityFrameworkCore.DbContext.get_Model()

Microsoft.EntityFrameworkCore.Internal.InternalDbSet.get_EntityType()

Microsoft.EntityFrameworkCore.Internal.InternalDbSet.get_EntityQueryable()

Microsoft.EntityFrameworkCore.Internal.InternalDbSet.System.Linq.IQueryable.get_Provider()

Microsoft.EntityFrameworkCore.RelationalQueryableExtensions.FromSqlRaw（DbSet 源，字符串 sql，Object[] 參數）

StudentServices.StudentInformationService.GetById(int id) 在 StudentInformationService.cs +

40. return _info.StudentRow.FromSqlRaw("StudentRegistrationInfo @IdNum, @OldIdNum",

HomeController.cs 中的 StudentChecklist.Controllers.HomeController.Index(Student student) +

37. var model = _info.GetById(id);

lambda_method（閉包，object，對象[]）

Microsoft.Extensions.Internal.ObjectMethodExecutor.Execute（對象目標，Object[] 參數）

Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker+d__12.MoveNext()

System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()

System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification（任務任務）

Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker+d__10.MoveNext()

System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()

Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Rethrow（ActionExecutedContext 上下文）

Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Next(ref State next, ref Scope scope, ref object state, ref bool isCompleted)

Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker+d__14.MoveNext()

System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()

System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification（任務任務）

Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker+d__22.MoveNext()

System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()

Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Rethrow（ResourceExecutedContext 上下文）

Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Next(ref State next, ref Scope scope, ref object state, ref bool isCompleted)

Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker+d__17.MoveNext()

System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()

System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification（任務任務）

Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker+d__15.MoveNext()

System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()

System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification（任務任務）

Microsoft.AspNetCore.Builder.RouterMiddleware+d__4.MoveNext()

System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()

System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification（任務任務）

Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware+d__7.MoveNext()

Answer 1

錯誤非常清楚 - 您的Student model class沒有定義實體的主鍵（它應該 - 總是）。

按照慣例， Id或(classname)Id （這里： StudentId ）將自動被視為主鍵 - 因為您沒有這些，您需要顯式注釋要用作主鍵的列 - 很可能是Id_Num列 - 與一個[Key]注釋 - 像這樣：

public class Student
{
    [Key]
    public int Id_Num { get; set; }

    // remainder of your properties
}