(1)精准查询；
list_Subject_at =list_Subject_at.Where(p => p.WareID == WareID_set).ToList();
(2)模糊查询；
list_Subject_at = list_Subject_at.Where(p => p.ProjTmName.Contains(srchtext)).ToList();
(3)多项模糊查询
list_Subject_at = list_Subject_at.Where(p => p.ProjTmName.Contains(srchtext) || p.SubjectSource.Contains(srchtext)).ToList();
原文：https://www.cnblogs.com/lysouko/p/13201921.html