Linq to sql 实现多条件的动态查询(方法一)

/// <summary>
/// Linq to sql 多字段动态查询
/// </summary>
/// <returns></returns>
private List<TVacant> ViewBinding(ModelDataContext db,string fyno,string brd,string area,string city,string pos)
{
Expression<Func<TVacant, bool>> expr = n => GetCondition(n,fyno,brd,area,city,pos);
var xQuery = db.TVacant.Where<TVacant>(expr.Compile());
return xQuery.ToList<TVacant>();
}
private bool GetCondition(TVacant tb,string fyno,string brd,string area,string city,string pos)
{
bool boolResult = true;
if (!String.IsNullOrEmpty(fyno))
{
boolResult &= tb.fy_no == fyno;
}
if (!String.IsNullOrEmpty(brd))
{
boolResult &= tb.brd_no == brd;
}
if (!String.IsNullOrEmpty(area))
{
boolResult &= tb.area_no == area;
}
if (!String.IsNullOrEmpty(city))
{
boolResult &= tb.city_no == city;
}
if (!String.IsNullOrEmpty(pos))
{
boolResult &= tb.pos_no == pos;
}
return boolResult;
}