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1.lin语句
int[] nums = { 5, 4, 1, 3, 9, 8, 6, 7, 2, 0, 3 };
DataTable table = new DataTable("Numbers");
table.Columns.Add("number", typeof(int));
foreach (int n in nums)
{
table.Rows.Add(new object[] { n });
}
var numbers = table.AsEnumerable();
var numberGroups =
from n in numbers
group n by n.Field<int>("number") into g
select new { Remainder = g.Key, Numbers = g };
foreach (var g in numberGroups)
{
Console.WriteLine("Numbers with a remainder of {0} when divided by 5:", g.Remainder);
foreach (var n in g.Numbers)
{
Console.WriteLine(n.Field<int>("number") + ",count:" + g.Numbers.Count());
}
}
2.比较器
public void Method{ var anagrams = testDS.Tables["Anagrams"].AsEnumerable(); var orderGroups = anagrams.GroupBy(w => w.Field<string>("anagram").Trim(), new AnagramEqualityComparer()); foreach (var g in orderGroups) { Console.WriteLine("Key: {0}", g.Key); foreach (var w in g) { Console.WriteLine("\t" + w.Field<string>("anagram")); } } } //创建一个比较器 private class AnagramEqualityComparer : IEqualityComparer<string> { public bool Equals(string x, string y) { return getCanonicalString(x) == getCanonicalString(y); } public int GetHashCode(string obj) { return getCanonicalString(obj).GetHashCode(); } private string getCanonicalString(string word) { char[] wordChars = word.ToCharArray(); Array.Sort<char>(wordChars); return new string(wordChars); } }
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原文地址：http://www.cnblogs.com/mawenzhu/p/4940743.html
