I have a generic list of int List<int>()
and I want to know Count of a item of it. How can I do it?
使用扩展方法是最简单的方法
int count = list.Count(i => i > 10);// get the count of those which is bigger than 10
如果要计算列表中项目数的计数,可以使用表达式执行此操作:
int count = myList.Count(i => i.Equals(5));
Count of A Generic List (generated from stored procedure)
List<GetDivisionsForGroup> GroupDivision = new List<GetDivisionsForGroup>();
String storedProcedures = "Sp_GetDivisionsForGroup " + grpid;
GroupDivision = db.ExecuteStoreQuery<GetDivisionsForGroup>("exec " + storedProcedures).ToList();
if (GroupDivision.Count > 0)
{
}
http://code.msdn.microsoft.com/LINQ-Aggregate-Operators-c51b3869
public void Linq73()
{
int[] factorsOf300 = { 2, 2, 3, 5, 5 };
int uniqueFactors = factorsOf300.Distinct().Count();
Console.WriteLine("There are {0} unique factors of 300.", uniqueFactors);
}
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