LINQ(Language Integrated Query)是一种用于查询和操作各种数据源的统一编程模型。它提供了一种简洁、直观的方式来查询和操作数据,无论是集合、数据库、XML文档还是其他数据源。 在LINQ中使用AND连接可以通过以下两种方式实现: 查询表达式方式: 代码语言:txt 复制 var result = from item in collection where item.Pro...
现在我们使用linq来实现上边的代码: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 publicvoidTest(string a,string b,string c,string d){QueryContext query=newQueryContext();varq=from uinquery.Users select u;if(!string.IsNullOrEmpty(a)){q=q.Where(p=>p.name==a);}if(!string.IsNullOrEmpty...
sql语句的想要实现的内容如下,重点关注where后面的条件部分:select...from...where(Test.id =3and Test.name ="N3") or (Test.id =4and Test.name ="N4") linq方式的动态实现如下:varpredicate = PredicateBuilder.False<Test>();foreach(varkeywordinsearchKeywords) {intnTemp =keyword.id;stringsTemp =...
现在我们使用linq来实现上边的代码: publicvoid Test(string a,string b,string c,string d) { QueryContext query =new QueryContext(); var q = from uin query.Users select u; if (!string.IsNullOrEmpty(a)) { q = q.Where(p => p.name == a); } if (!string.IsNullOrEmpty(b)) { q = ...
I have a sql data source that is populating a dropdown. I am trying to do it with linq. Here is the query SELECT sUserFullName, MIN(nUserID) AS nUserID FROM UserMaster WHERE nssiCorpID = 6036 AND (nDatabaseID <> 0) AND (nStatusMasterID = 200) ...
This series of examples shows you Language Integrated Query (LINQ) techniques to use with collections and arrays.
C# LinQ query to pull top 3 records from data table C# List vs IList C# List<>: How to read the data? C# List<struct> vs List<class> memory usage C# LITHUANIAN ENCODING c# logic to login to a website, enter value and scrap the data. C# Login Interface with Streamreader and S...
To execute a LINQ query against an Oracle database, you will add a reference to an Entity Framework assembly. You will then create the code to execute a LINQ query and return the results to the console window. 1. In the Solution Explorer window, right-click References and select Add ...
Queries using DateOnly and TimeOnly work in the expected manner. For example, the following LINQ query finds schools that are currently open: Copy openSchools = await context.Schools .Where( s => s.Terms.Any( t => t.FirstDay <= today && t.LastDay >= today) && s.OpeningHours.Any(...
A sample LINQ query in the upcoming "Orcas" version of C# might look like: 複製 var overdrawnQuery = from account in db.Accounts where account.Balance < 0 select new { account.Name, account.Address }; When the results of this query are iterated over using for...