在where子句中使用变量的LINQ查询

Question

我已经在这几个小时，倾注了几个相似的问题。如何使此代码生效？

public void DoSomething(List<TheObj> objs, string lnameStr)
    {
        var pQuery = (from o in objs
                      where o.Lname.Contains(lnameStr)
                      select o).ToList();

        foreach (var theObj in pQuery)
        {
            Trace.WriteLine(theObj.Fname);
        }
    }

由于

Answer 1

public void DoSomething(List<TheObj> objs, string lnameStr)
    {
      if(objs != null && !string.IsNullOrEmpty(lnameStr))   
       {
        var pQuery = (from o in objs
                      where !string.IsNullOrEmpty(p.Lname) && 
                            o.Lname.Contains(lnameStr)
                      select o).ToList();

        foreach (var theObj in pQuery)
        {
            Trace.WriteLine(theObj.Fname);
        }
      }
    }