/// <summary>
/// 获取当前上下文,负责创建EF数据操作上下文实例，必须保证线程内唯一
/// </summary>
/// <returns></returns>
public static DbContext GetDbContext()
{
DbContext db = CallContext.GetData("HT_NewsEntities") as DbContext;
if (db == null)
{
db = new HT_NewsEntities();
CallContext.SetData("HT_NewsEntities", db);
}
return(db);
}