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我新的EF代碼首先，當我嘗試實施同一所面臨的誤差跟蹤，EF代碼優先 - System.InvalidOperationException
操作 - 當運行應用程序：
1。在遷移表格後，第一次成功地將新記錄插入'GroupPrivileges'。
2.更新'GroupPrivileges'的相同記錄時會拋出錯誤。
3.類似地，當我嘗試在'GroupPrivileges'上插入新的第二條記錄時，同樣的錯誤彈出。
錯誤：
'System.InvalidOperationException' 類型的異常出現在EntityFramework.dll但在用戶代碼中沒有處理
其他信息： 類型「的System.Collections中的對象。 Generic.List`1 [[Dsms.Model.User.GroupModel， Dsms.Model，Version = 1.0.0.0，Culture = neutral，PublicKeyToken = null]]' 無法設置或從EntityReference的Value屬性中移除 類型'Dsms.Model.User.GroupModel'。
請幫我解決這個問題，我不能採取更進一步:-(
有了這個，請找到下面的模型和對DBConfig類。
public abstract class BaseModel
{
public int DrivingSchoolId { get; set; }
public int UserId { get; set; }
public string ExternalId { get; set; }
[Display(Name = "Active")]
public bool IsActive { get; set; }
public int CreatedBy { get; set; }
public DateTime CreatedOn { get; set; }
public int ModifiedBy { get; set; }
public DateTime ModifiedOn { get; set; }
public BaseModel()
{
IsActive = true;
CreatedOn = DateTime.Now;
ModifiedOn = DateTime.Now;
ExternalId = Guid.NewGuid().ToString("N");
}
}
public class GroupModel : BaseModel
{
[Key]
public int GroupId { get; set; }
[Display(Name = "Name")]
[DataType(DataType.Text)]
[Required(ErrorMessage = "Please fill the 'Name'")]
[MaxLength(100, ErrorMessage = "Maximum character lenght of 'Name' is 100.")]
public string Name { get; set; }
[Display(Name = "Code")]
[DataType(DataType.Text)]
[Required(ErrorMessage = "Please fill the 'Code'")]
[MaxLength(15, ErrorMessage = "Maximum character lenght of 'Code' is 15.")]
public string Code { get; set; }
[Display(Name = "Description")]
[DataType(DataType.MultilineText)]
[MaxLength(500, ErrorMessage = "Maximum character lenght of 'Description' is 500.")]
public string Description { get; set; }
//EF Navigation properties starts
public virtual ICollection<DrivingSchoolModel> DrivingSchools { get; set; }
public virtual UserGroupModel UserGroup { get; set; }
public virtual GroupPrivilegeModel GroupPrivilege { get; set; }
}
public class RoleModel : BaseModel
{
[Key]
public int RoleId { get; set; }
[Display(Name = "Name")]
[DataType(DataType.Text)]
[Required(ErrorMessage = "Please fill the 'Name'")]
[MaxLength(100, ErrorMessage = "Maximum character lenght of 'Name' is 100.")]
public string Name { get; set; }
[Display(Name = "Code")]
[DataType(DataType.Text)]
[Required(ErrorMessage = "Please fill the 'Code'")]
[MaxLength(15, ErrorMessage = "Maximum character lenght of 'Code' is 15.")]
public string Code { get; set; }
[Display(Name = "Description")]
[DataType(DataType.MultilineText)]
[MaxLength(500, ErrorMessage = "Maximum character lenght of 'Description' is 500.")]
public string Description { get; set; }
//EF Navigation properties starts
public virtual GroupPrivilegeModel GroupPrivilege { get; set; }
public virtual UserRoleModel UserRole { get; set; }
}
public class GroupPrivilegeModel : BaseModel
{
[Key]
public int GroupPrivilegeId { get; set; }
[Display(Name = "Group")]
[DataType(DataType.Text)]
[Required(ErrorMessage = "Please select the 'Group'")]
public int GroupId { get; set; }
[Display(Name = "Role")]
[DataType(DataType.Text)]
[Required(ErrorMessage = "Please select the 'Role'")]
public int RoleId { get; set; }
//EF Navigation properties starts
public virtual ICollection<GroupModel> Groups { get; set; }
public virtual ICollection<RoleModel> Roles { get; set; }
}
public GroupConfiguration()
{
this.ToTable("Groups", DsmsContext.DEFAULT_DB_SCHEMA);
this.HasKey(g => g.GroupId);
this.HasRequired(g => g.DrivingSchools).WithMany().HasForeignKey(g => g.DrivingSchoolId);
this.Property(g => g.ExternalId).HasColumnName("ExternalGroupId").HasMaxLength(50).IsRequired();
this.Property(g => g.Name).HasMaxLength(100).IsRequired();
this.Property(g => g.Code).HasMaxLength(15).IsRequired();
this.Property(g => g.Description).HasMaxLength(500).IsOptional();
this.Property(g => g.DrivingSchoolId).IsRequired();
this.Property(g => g.IsActive).IsRequired();
this.Property(g => g.CreatedBy).IsRequired();
this.Property(g => g.CreatedOn).IsRequired();
this.Property(g => g.ModifiedBy).IsOptional();
this.Property(g => g.ModifiedOn).IsOptional();
this.Ignore(g => g.UserId);
this.Ignore(g => g.UserGroup);
this.Ignore(g => g.GroupPrivilege);
}
public RoleConfiguration()
{
this.ToTable("Roles", DsmsContext.DEFAULT_DB_SCHEMA);
this.HasKey(r => r.RoleId);
this.Property(r => r.ExternalId).HasColumnName("ExternalRoleId").HasMaxLength(50).IsRequired();
this.Property(r => r.Name).HasMaxLength(100).IsRequired();
this.Property(r => r.Code).HasMaxLength(15).IsRequired();
this.Property(r => r.Description).HasMaxLength(500).IsOptional();
this.Property(r => r.IsActive).IsRequired();
this.Property(r => r.CreatedBy).IsRequired();
this.Property(r => r.CreatedOn).IsRequired();
this.Property(r => r.ModifiedBy).IsOptional();
this.Property(r => r.ModifiedOn).IsOptional();
this.Ignore(r => r.DrivingSchoolId);
this.Ignore(r => r.UserId);
this.Ignore(r => r.GroupPrivilege);
this.Ignore(r => r.UserRole);
}
public GroupPrivilegeConfiguration()
{
this.ToTable("GroupPrivileges", DsmsContext.DEFAULT_DB_SCHEMA);
this.HasKey(gp => gp.GroupPrivilegeId);
this.HasRequired(gp => gp.Groups).WithMany().HasForeignKey(gp => gp.GroupId);
this.HasRequired(gp => gp.Roles).WithMany().HasForeignKey(gp => gp.RoleId);
this.Property(gp => gp.IsActive).IsRequired();
this.Property(gp => gp.CreatedBy).IsRequired();
this.Property(gp => gp.CreatedOn).IsRequired();
this.Property(gp => gp.ModifiedBy).IsOptional();
this.Property(gp => gp.ModifiedOn).IsOptional();
this.Ignore(gp => gp.DrivingSchoolId);
this.Ignore(gp => gp.UserId);
this.Ignore(gp => gp.ExternalId);
}