var filteredOrders = orders.Order.Where(order => new[] {"A", "B", "C"}.Any(s => s == order.StatusCode)); Here we again see one of the LINQ surprises (like Joda-speech which puts select at the end). However it is quite logical in this sense that it checks if at least o...
要使用LINQ将List<Object>转换为List<List<int>>,可以使用LINQ的Select方法和类型转换操作符来实现。下面是一个示例代码: 代码语言:csharp 复制 using System; using System.Collections.Generic; using System.Linq; class Program { static void Main(string[] args) { List<Object> objectList = new List<...
};//在clist中查找Age大于20的客户,//在clist2中查找Age小于30的客户varquery =fromcustomerinclistwherecustomer.Age >20fromcustomer2inclist2wherecustomer2.Age <30selectnew{ customer, customer2 };foreach(varciinquery) { Console.WriteLine("{0} {1}", ci.customer.Name,ci.customer2.Name); } }...
//方式一//分成key-value的数组string[] id = list.Select(a =>a.id.ToString()).ToArray();//dt是datatable类型的,执行LINQ语句,这里的.AsEnumerable()是延迟发生,不会立即执行,实际上什么都没有发生string[] id = dt.AsEnumerable().Select(a => a.Field<int>("id").ToString()).ToArray();/...
select:用于选择返回的结果集。 示例: var numbers = new List<int> { 1, 2, 3, 4, 5 }; var result = from num in numbers select $"Number: {num}"; // 执行结果:result = { "Number: 1", "Number: 2", "Number: 3", "Number: 4", "Number: 5" } ...
IF you want to select object with minimum or maximum property value. another way is to use Implementing IComparable. public struct Money : IComparable<Money> { public Money(decimal value) : this() { Value = value; } public decimal Value { get; private set; } public int...
// Return the FileInfo object for the largest file// by sorting and selecting from beginning of listFileInfo longestFile = (fromfileinfileListletfileInfo =newFileInfo(file)wherefileInfo.Length >0orderbyfileInfo.LengthdescendingselectfileInfo ).First(); Console.WriteLine($"The largest file under...
要使用LINQ来获得不同的多个列,可以使用匿名类型和选择操作符(select)来实现。以下是一个示例代码: 代码语言:txt 复制 var result = from item in collection select new { Column1 = item.Property1, Column2 = item.Property2 }; 在上述代码中,collection是要查询的数据源,item是数据源中的每个元...
// Return the FileInfo object for the largest file// by sorting and selecting from beginning of listFileInfo longestFile = (fromfileinfileListletfileInfo =newFileInfo(file)wherefileInfo.Length >0orderbyfileInfo.LengthdescendingselectfileInfo ).First(); Console.WriteLine($"The large...