LINQ小记
//LINQ 根据长度查询出来
string[] strs = new string[] { "1", "22", "333", "4444", "55555" };
var end = from str in strs where str.Length < 3 select str;
var i = "";
foreach (var item in end)
{
i = i + item + "|";
}
this.Label1.Text = i.Substring(0, i.Length - 1);
//LINQ 根据长度分组进行查询
string[] words = new string[] { "hello", "cup", "vagetable", "mouse", "telephone" };
var list =
from w in words
group w by w.Length into lists
orderby lists.Key ascending
select new { key = lists.Key, value = lists };
foreach (var item in list)
{
Label2.Text += string.Format("长度:{0},{1}</br>", item.key, string.Join(",", item.value));
}
//LINQ 根据同名进行查询
string[] ss = new string[]
{ "hello", "hello", "cup", "cup", "cup", "vagetable", "mouse", "telephone", "telephone" };
var l =
from s in ss
group s by s into lists
orderby lists.Key
select lists;
foreach (var item in l)
{
Label3.Text += string.Format("{0},数量:{1}<br/>",item.FirstOrDefault(),item.Count().ToString());
}