我的數據庫中有兩個表。第一個是MyStudent,另一個是MyCourse。我使用.net的entityframework,並在Visual Studio中創建了一個名爲「BestModel」的模型。這是我的課程;在asp.net中創建新記錄時出現錯誤Razor引擎
MyStudent.cs
namespace tt.Models
{
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations.Schema;
public partial class MyStudent
{
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")]
public MyStudent()
{
this.MyCourse = new HashSet<MyCourse>();
}
public int Id { get; set; }
public string Name { get; set; }
[ForeignKey("MyCourse")]
public Nullable<int> CourseId { get; set; }
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
public virtual ICollection<MyCourse> MyCourse { get; set; }
}
}
MyCourse.cs
namespace tt.Models
{
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations.Schema;
public partial class MyCourse
{
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")]
public MyCourse()
{
this.MyStudent = new HashSet<MyStudent>();
}
public int Id { get; set; }
public string Title { get; set; }
[ForeignKey("MyStudent")]
public Nullable<int> StudentId { get; set; }
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
public virtual ICollection<MyStudent> MyStudent { get; set; }
}
}
這裏是我的表定義;
CREATE TABLE [dbo].[MyStudent] (
[Id] INT NOT NULL,
[Name] NVARCHAR (50) NULL,
[CourseId] INT NULL,
FOREIGN KEY (CourseId) REFERENCES MyCourse(Id),
PRIMARY KEY CLUSTERED ([Id] ASC)
);
CREATE TABLE [dbo].[MyCourse] (
[Id] INT NOT NULL,
[Title] NVARCHAR (50) NULL,
[StudentId] INT NULL,
FOREIGN KEY (StudentId) REFERENCES MyStudent(Id),
PRIMARY KEY CLUSTERED ([Id] ASC),
);
CREATE TABLE [dbo].[MyStudentCourses] (
[CourseId] INT NOT NULL,
[StudentId] INT NOT NULL,
FOREIGN KEY (CourseId) REFERENCES MyCourse(Id),
FOREIGN KEY (StudentId) REFERENCES MyStudent(Id)
);
這是我的創建函數;
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Create([Bind(Include = "Id,Title")] MyCourse myCourse)
{
if (ModelState.IsValid)
{
MyStudent st = new MyStudent();
st.Id = 10;
st.CourseId = 1;
st.Name = "sadasd".ToString();
myCourse.MyStudent.Add(st); // when this line commented everything is fine.. .
db.MyCourse.Add(myCourse);
db.SaveChanges();
return RedirectToAction("Index");
}
return View(myCourse);
}
我指定了上述問題的關注點。當我想創建一條新記錄時,它會給我「更新條目時發生錯誤,請參閱內部例外以瞭解詳細信息。」但是,當我禁用該行「myCourse.MyStudent.Add(st);」一切安好。我認爲問題是關於這兩個表和外鍵之間的關係。請幫幫我 。 ..
EDIT
類之間的關係是多對多。 。 。
EDIT2
的InnerException就是這樣;
System.Data.Entity.Core.UpdateException:更新條目時發生錯誤。詳情請參閱內部例外。 ---> System.Data.SqlClient.SqlException:INSERT語句與FOREIGN KEY約束「FK__MyStudent__Cours__35BCFE0A」衝突。衝突發生在數據庫「MyDB」,表「dbo.MyCourse」,列'Id'。該語句已終止。 System.Data.SqlClient.SqlConnection.OnError(SqlException異常,布爾breakConnection,動作1 wrapCloseInAction) at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection, Action
1 wrapCloseInAction)在System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj,布爾callerHasConnectionLock,布爾asyncClose)在System.Data.SqlClient.TdsParser .TryRun(runBehavior runBehavior,SqlCommand的cmdHandler,SqlDataReader的數據流,BulkCopySimpleResultSet bulkCopyHandler,TdsParserStateObject stateObj,布爾& dataReady)在System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader的DS,runBehavior runBehavior,字符串resetOptionsString,布爾isInternal,布爾forDescribeParameterEncryption)在系統.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior,RunBehavior runBehavior,布爾returnStream,布爾異步,Int32超時,任務&任務,布爾asyncWrite,布爾inRetry,SqlDataReader ds,布爾describeP ()方法返回一個字符串,這個字符串表示一個字符串,這個字符串表示一個字符串,這個字符串表示一個字符串,這個字符串表示一個字符串,這個字符串表示這個字符串的位置。 System.Data.SqlClient.SqlCommand.ExecuteNonQuery()在System.Data.Entity.Infrastructure.Interception.DbCommandDispatcher.b__0(的DbCommand噸,DbCommandInterceptionContext 1 c) at System.Data.Entity.Infrastructure.Interception.InternalDispatcher
1.Dispatch [t目標,TInterceptionContext,TResult](t目標靶,函數功能3 operation, TInterceptionContext interceptionContext, Action
3執行, Action 3 executed) at System.Data.Entity.Infrastructure.Interception.DbCommandDispatcher.NonQuery(DbCommand command, DbCommandInterceptionContext interceptionContext) at System.Data.Entity.Internal.InterceptableDbCommand.ExecuteNonQuery() at System.Data.Entity.Core.Mapping.Update.Internal.DynamicUpdateCommand.Execute(Dictionary
2 identifierValues,List 1 generatedValues) at System.Data.Entity.Core.Mapping.Update.Internal.UpdateTranslator.Update() --- End of inner exception stack trace --- at System.Data.Entity.Core.Mapping.Update.Internal.UpdateTranslator.Update() at System.Data.Entity.Core.EntityClient.Internal.EntityAdapter.b__2(UpdateTranslator ut) at System.Data.Entity.Core.EntityClient.Internal.EntityAdapter.Update[T](T noChangesResult, Func
2 updateFunction)at System.Data.Entity.Core.EntityClient.Internal.EntityAdapter.Update()at System.Data.Entity.Core.Objects.ObjectContext.b__35()at System.Data.Entity .Core.Objects.ObjectContext。ExecuteInTransaction [T](Func 1 func, IDbExecutionStrategy executionStrategy, Boolean startLocalTransaction, Boolean releaseConnectionOnSuccess) at System.Data.Entity.Core.Objects.ObjectContext.SaveChangesToStore(SaveOptions options, IDbExecutionStrategy executionStrategy, Boolean startLocalTransaction) at System.Data.Entity.Core.Objects.ObjectContext.<>c__DisplayClass2a.b__27() at System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.Execute[TResult](Func
1 operation)at System.Data.Entity.Core.Objects.ObjectContext.SaveChangesInternal(SaveOptions options,Boolean executeInExistingTransaction)at System.Data.Entity.Core.Objects.ObjectContext.SaveChanges(SaveOptions options)at System.Data.Entity.Internal.InternalContext.SaveChanges()
問題仍在進行中。請幫幫我 。 。 。 –
你有沒有進入InnerException?嘗試了一個try-catch塊? [此](http://stackoverflow.com/questions/11531769/saving-many-to-many-relationship-data-on-mvc-create-view)有幫助嗎? –
我編輯並添加了內部消息。 –