小编Ash*_*ran的帖子

我通过在ApplicationUser派生自的类中添加几个字段来扩展ASP NET标识架构IdentityUser.我添加的领域之一是FullName.

现在,当我写的时候User.Identity.Name,它给了我用户名,我正在寻找类似的东西User.Identity.FullName应该返回我添加的FullName.

不确定,如何实现这一点,我们将非常感谢任何指导.

谢谢.

这是我的模特.我有一对一的车辆和司机映射.我将首先创建车辆,然后将驾驶员映射到车辆.

public class Driver
{
    public int Id { get; set; }
    public String Name { get; set; }
    public int VehicleId { get; set; }
    public virtual Vehicle Vehicle  { get; set; }
}

public class Vehicle
{  
    public int Id { get; set; }
    public String Name { get; set; }

    public virtual Driver Driver { get; set; }

    public int VehicleGroupId { get; set; }
    public virtual VehicleGroup Vehicles { get; set; }
}

我想在Driver类中使用VehicleId属性来保持驱动程序正在驱动的车辆ID.

我编写了以下Fluent API代码: …

我首先使用EF6代码来创建我的数据库.昨晚一切都运行良好,现在当我运行update-database命令时,我得到以下异常:

PM> update-database
Specify the '-Verbose' flag to view the SQL statements being applied to the target database.
System.ArgumentNullException: Value cannot be null.
Parameter name: extent
   at System.Data.Entity.Utilities.Check.NotNull[T](T value, String parameterName)
   at System.Data.Entity.Core.Mapping.StorageEntitySetMapping..ctor(EntitySet extent, StorageEntityContainerMapping entityContainerMapping)
   at System.Data.Entity.ModelConfiguration.Edm.DbDatabaseMappingExtensions.AddEntitySetMapping(DbDatabaseMapping databaseMapping, EntitySet entitySet)
   at System.Data.Entity.ModelConfiguration.Edm.Services.TableMappingGenerator.Generate(EntityType entityType, DbDatabaseMapping databaseMapping)
   at System.Data.Entity.ModelConfiguration.Edm.Services.DatabaseMappingGenerator.GenerateEntityTypes(DbDatabaseMapping databaseMapping)
   at System.Data.Entity.ModelConfiguration.Edm.Services.DatabaseMappingGenerator.Generate(EdmModel conceptualModel)
   at System.Data.Entity.DbModelBuilder.Build(DbProviderManifest providerManifest, DbProviderInfo providerInfo)
   at System.Data.Entity.DbModelBuilder.Build(DbConnection providerConnection)
   at System.Data.Entity.Internal.LazyInternalContext.CreateModel(LazyInternalContext internalContext)
   at System.Data.Entity.Internal.RetryLazy`2.GetValue(TInput input)
   at System.Data.Entity.Internal.LazyInternalContext.InitializeContext()
   at System.Data.Entity.Internal.LazyInternalContext.get_CodeFirstModel()
   at System.Data.Entity.Infrastructure.EdmxWriter.WriteEdmx(DbContext context, XmlWriter writer)
   at System.Data.Entity.Utilities.DbContextExtensions.<>c__DisplayClass1.<GetModel>b__0(XmlWriter w)
   at System.Data.Entity.Utilities.DbContextExtensions.GetModel(Action`1 …

我正在尝试在两个数据表上使用LINQ应用左外连接.当我尝试调试并查看结果变量中包含的数据时,我收到下面列出的异常:

System.ArgumentException:值不能为null.参数名称:行

码:

private DataTable DataTable1()
{
    DataRow dataRow = null;
    DataTable dt1 = new DataTable();
    dt1.Columns.Add("EmpId");
    dt1.Columns.Add("EmpName");
    dataRow = dt1.NewRow();
    dataRow["EmpId"] = "EMP001";
    dataRow["EmpName"] = "Ajaj Kumar";
    dt1.Rows.Add(dataRow);
    dataRow = dt1.NewRow();
    dataRow["EmpId"] = "EMP002";
    dataRow["EmpName"] = "Sanjay Gupta";
    dt1.Rows.Add(dataRow);
    dataRow = dt1.NewRow();
    dataRow["EmpId"] = "EMP003";
    dataRow["EmpName"] = "Ashish Charan";
    dt1.Rows.Add(dataRow);
    dt1.AcceptChanges();
    return dt1;
}

private DataTable DataTable2()
{
    DataRow dr = null;
    DataTable dt2 = new DataTable();
    dt2.Columns.Add("EmpId");
    dt2.Columns.Add("Salary");
    dr = dt2.NewRow();
    dr["EmpId"] = "EMP001";
    dr["Salary"] = "50000";
    dt2.Rows.Add(dr); …