Question

首先使用Entity Framework 5，数据库。

是否可以（在运行时）获取实体属性所代表的数据库列的数据类型？如果更容易，.net类型也可以正常工作。

IEnumerable<DbEntityEntry> entities =
    context.ChangeTracker.Entries()
            .Where(
                e =>
                e.State == EntityState.Added || e.State == EntityState.Modified);

foreach (DbEntityEntry entity in entities)
{
   foreach (string propertyName in entity.CurrentValues.PropertyNames)
   {
     //so I know the entity and the property name.  Can I get the data type?
   }
}

Answer 1

在实体上使用反射来获取属性信息。

foreach (DbEntityEntry entity in entities)
{
    foreach (string propertyName in entity.CurrentValues.PropertyNames)
    {
        var propertyInfo = entity.Entity.GetType().GetProperty(propertyName);
        var propertyType = propertyInfo.PropertyType;

    }
}

Answer 2

获取表格特定列的数据类型：

[假设：实体道具类名称：供应商和列名称=＆＃34; VendorID＆＃34;]

string columnTypName =   (context.Vendors.EntitySet.ElementType.Members["VendorID"].TypeUsage.EdmType).Name;

动态获取列的所有列名称和类型：

[Param：tableName]

var columns = from meta in ctx.MetadataWorkspace.GetItems(DataSpace.CSpace)
                                       .Where(m => m.BuiltInTypeKind == BuiltInTypeKind.EntityType)
                       from p in (meta as EntityType).Properties
                       .Where(p => p.DeclaringType.Name == tableName)
                       select new
                       {
                           colName = p.Name,
                           colType = p.TypeUsage.EdmType.Name
                       };

从实体框架实体获取列DataType

2 个答案: