// 程序目的为了实现多关键字查询
            SourceDataContext s = new SourceDataContext();
            IQueryable<vw_source_list> result = s.vw_source_list;//vw_source_list 为一个表

            //方式一 关键字在数组keys数组里面，采用遍历的方法，不成功，只能把最后的b传过去
            string[] keys = { "a", "b" };
            foreach (string key in keys)
            {
                result = result.Where(t => t.source_subject.Contains(key));
            }
            //方式二 关键字在数组keys2数组里面，采用直接传值的方法，成功
            string[] keys2 = { "c", "d" };
            result = result.Where(t => t.source_subject.Contains(keys2[0]));
            result = result.Where(t => t.source_subject.Contains(keys2[1]));

            //输出
            var sql = s.GetCommand(result.Select(t => t.id)).CommandText;
                //sql内容为：
                //SELECT [t0].[id]
                //FROM [dbo].[WCMS_vw_source_list] AS [t0]
                //WHERE ([t0].[source_subject] LIKE @p0)
                //  AND ([t0].[source_subject] LIKE @p1)
                //  AND ([t0].[source_subject] LIKE @p2)
                //  AND ([t0].[source_subject] LIKE @p3)
            var exp =  result.Select(t => t.id).Expression;
                //exp内容为：
                //{Table(vw_source_list)
                //.Where(t => t.source_subject.Contains(value(WMVC.Controllers.SourceBrowserController+<>c__DisplayClassb).key))
                //.Where(t => t.source_subject.Contains(value(WMVC.Controllers.SourceBrowserController+<>c__DisplayClassb).key))
                //.Where(t => t.source_subject.Contains(value(WMVC.Controllers.SourceBrowserController+<>c__DisplayClass7).keys2[0]))
                //.Where(t => t.source_subject.Contains(value(WMVC.Controllers.SourceBrowserController+<>c__DisplayClass7).keys2[1]))
                //.Select(t => t.id)}
            //触发Linq查询数据库
            foreach (var item in result)
            {
                Console.WriteLine(item.id);
            }
            //MSSQL里面监控结果如下：
                //sql语句
                //SELECT [t0].[id],[t0].[source_subject]
                //FROM [dbo].[WCMS_vw_source_list] AS [t0]
                //WHERE ([t0].[source_subject] LIKE @p0)
                //  AND ([t0].[source_subject] LIKE @p1)
                //  AND ([t0].[source_subject] LIKE @p2)
                //  AND ([t0].[source_subject] LIKE @p3)
                
                //参数
                //@p0=N'%d%',
                //@p1=N'%c%',
                //@p2=N'%b%',
                //@p3=N'%b%'    ！！！！ "a" 没传过来！！！！

            //请问：如何用方式一把关键字传过来，也就是关键字数未定的情况下，怎么写where Contains ？