HashSet -LinQ - Query - Select in a new object HashSet of "Lists of Strings" Hashtable of lists Have C# check what version of Excel is installed Have ListBox an event when addid or removing Items? Having an error "Cannot find table 0" C# Having trouble with DBNull.Value and string...
在LINQ语句中,可以通过重用select关键字来创建新的对象。 LINQ(Language Integrated Query)是一种用于.NET平台的查询技术,它允许开发人员使用类似于SQL的查询语法来查询各种数据源,包括集合、数据库、XML等。在LINQ查询中,select关键字用于指定查询结果的投影,即选择需要返回的数据。
关于LINQ中SELECTNEW的问题 关于LINQ中SELECTNEW的问题 public static object SelectAnyInfo(){ DataAccessContext context = new DataAccessContext();var query = from c in context.VideoNetServers from cc in context.Areas from ver in context.VersionItems where c.Areas.AreaID == cc.AreaID && c.Video...
关于LINQ中SELECT NEW 的问题 public static object SelectAnyInfo() { DataAccessContext context = new DataAccessContext(); var query = from c in context.VideoNetServers from cc in context.Areas from ver in context.VersionItems where c.Areas.AreaID == cc.AreaID && c.VideoNetServerRowID == v...
int[] fibonacci = new int[] { 1, 1, 2, 3, 5, 8, 13, 21 }; var result = fibonacci.Select(f => f); foreach (var item in result) { Console.WriteLine(item); } Object[] arr = new Object[] { "String", 12, true, 10.0m, 'a' }; ...
vary=db.FuelBenefits.Where(f=>f.Active==true).Select(f=>newFuelAmountEmployeeCycle{CycleId=1,...
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...
List<object> results = students.Select(p => new { p.Class, p.Name }).ToList(); 简单运算操作 Linq 里有几个需要注意的简单运算操作,这部分在使用中很常见。 Max 选取最大的一个 Max获取数据源中最大的一个,不过只能是数字类型的,其他类型因为不能直接比较大小所以可以有替代方法,就是先排序取第一...
string[] words = ["the","quick","brown","fox","jumps"]; IEnumerable<string> query =fromwordinwordswhereword.Length ==3selectword;foreach(stringstrinquery) { Console.WriteLine(str); }/* This code produces the following output: the fox */ ...