SampleCode\CS\GeneralProgramming\Queries\RetrieveMultipleConditionOperatorsLinq.cs 要求 有关运行此 SDK 中提供的示例代码的要求的详细信息,请参阅使用示例和帮助程序代码。 演示 此示例演示如何使用 .NET 语言集成查询 (LINQ) 检索多个条件运算符。 示例
在查询中对数据进行分组时,可以在 属性中包含Select聚合方法。 可以使用以下聚合方法: Count() Average(列) Sum(列) Max(列) Min(列) Where(condition) Any() All(condition) 有关详细信息,请参阅LinqDataSource Web 服务器控件概述和如何:使用 LinqDataSource 控件对数据进行分组和聚合...
var map = first.Parameters.Select((f, i) => new { f, s = second.Parameters[i] }).ToDictionary(p => p.s, p => p.f); // replace parameters in the second lambda expression with parameters from the first var secondBody = ParameterRebinder.ReplaceParameters(map, second.Body); // ...
Add new attribute on SelectListItem Add new item in list at view and return to controller in MVC Add question mark to tooltip Add text to validation field with jquery Add View ->scaffold template is disabled Add Windows Authentication to Mvc 5 project add/update/delete viewbag AddDefaultIdenti...
from [type] id in source [join [type] id in source on expr equals expr [into subGroup]] [from [type] id in source | let id = expr | where condition] [orderby ordering,ordering,ordering...] select expr | group expr by key [into id query] ...
var q = from p in db.Products select new { p.ProductID, HalfPrice = p.UnitPrice / 2 };上面语句描述:使用SELECT和匿名类型返回所有产品的ID以及HalfPrice(设置为产品单价除以2所得的值)的序列。 3.条件形式:说明:生成SQL语句为:case when condition then else。
select d;string[]items=itemName.Split(' ');foreach(string iteminitems){if(IsYear(item)){int year=Convert.ToInt32(item);data=data.Where(d=>d.Year==year);}elseif(IsLocation(item)){string location=item;data=data.Where(d=>d.Location==location);}else{string keyword=item;data=data.Wher...
Optional. AWhereclausespecifies a filtering condition for a query. For example: VB ' Returns all product names for which the Category of' the product is "Beverages".Dimnames =FromproductInproductsWhereproduct.Category ="Beverages"Selectproduct.Name ...
If you want rows with Code property value matching your condition:var rows = listOfRows.Where(r => r.Code.Split(",").Any(s => (---your condition---))); If you only want Code property values:var values = listOfRows.Select(r => r.Code.Split(",")).Where(s => (...
Most basic way - I am checking field from my Class, which can be null. When I just check it in that way it will return Null Reference Exception var soldOutProducts = from p in list where p.destinataire.StartsWith("D") select p; c#...