List Collection Contains exact string

Question

I have a List Collection and say that i am adding 3 items to them.

list.Add(new ContentDomain() {  Id = "1" , Content = "aaa,bbb,ccc,ddd"});
list.Add(new ContentDomain() {  Id = "2" , Content = "aa,bb,cc,dd"});
list.Add(new ContentDomain() {  Id = "3" , Content = "a,b,c,d"});

Now what i want is to fetch the rows that have just 'a' in the Content attribute.

Like i tried something like

list = list.Where(x => x.Content.ToLower().Contains("a")).ToList();

but that would give me all the three rows.

i want to search in a string for the exact string only.

Answer 1

list.Where(x => x.ToString().ToLower().Split(',').Where(a => a.Trim() == "a").Any()).ToList();

编辑：将Count（）> 0更改为Any（）以获得更好的性能

Answer 2

将其转换为字符串数组，并在数组中查找字符串。

list = list.Where(x => x.Content.ToLower().Split(',').IndexOf("a")>= 0).ToList();

Answer 3

Try this:

        IList<ContentDomain> returned = new List<ContentDomain>();
        foreach(ContentDomain myList in list)
        {
            var ret = myList.Content.Split(',');
            bool exists = (from val in ret
                          where val.Contains('a')
                          select true).FirstOrDefault();
            if (exists)
                returned.Add(myList);
        }