你好我怎么做动态选择列查询?
例如
CrewEntities _DbEntities = new CrewEntities(); // I'm using object context
public class CrewItem
{
public string Name { get; set; }
public string LastName { get; set; }
}
//我想只列出名称列
var NameList = GetDynamicColumn("Name");
或
I want to list only LastName column
var LastNameList = GetDynamicColumn("Name");
publict List<CrewItem> GetDynamicColumn(string Columm)
{
var query = from p in _DbEntities.t_Crew
select p.??? ;
}
和怎么做,我做动态选择表查询?
例如
我的sql表&gt;&gt; t_Crew,t_Person
var crewTable = GetDynamicTable("t_Crew");
var personTable = GetDynamicTable("t_Person");
publict List<CrewItem> GetDynamicTable(string tableName)
{
var query = from p in _DbEntities.???
select p;
}
谢谢
答案 0 :(得分:0)
对于问题的第二部分,如果您使用Linq2SQL获取动态表数据,则可以使用此查询
public IQueryable<TEntity> GetDynamicTable<TEntity>()
{
return _DbEntities.GetTable<TEntity>().Select(i => i);
}
或者有过滤器(在哪里)你可以写:
public IQueryable<TEntity> GetDynamicTable<TEntity>(Expression<Func<TEntity, bool>> expression)
{
return _DbEntities.GetTable<TEntity>().Select(i => i).Where(expression).AsQueryable();
}