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The way you'd do a join on more than one criteria generally is to use an anonymous type: join pc in productcategory on new { Id = p.Id, Other = p.Other } equals new { Id = pc.ProdId, Other = pc.Other }. This works in Linq-to-Objects, and I presume the same will work with database queries as well.
1 kwi 2017 · var db1 = (from a in AccYearEntity.OBLHManifests select a).ToList(); var db2 = (from a in MasterEntity.UserMasters select a).ToList(); var query = (from a in db1. join b in db2 on a.EnteredBy equals b.UserId. where a.LHManifestNum == LHManifestNum.
Inner Join (Join): The Join method performs an inner join by correlating the elements of two collections based on matching keys. It returns a new collection that includes elements from both collections where the keys match.
29 maj 2024 · The join methods provided in the LINQ framework are Join and GroupJoin. These methods perform equijoins, or joins that match two data sources based on equality of their keys. (For comparison, Transact-SQL supports join operators other than equals, for example the less than operator.)
4 wrz 2022 · I will show two methods for executing joins between tables. The first method is with the LINQ to SQL method with the familiar join operator, and the second is with Entity Framework Core and the Join () extension method.
15 wrz 2021 · The examples in this topic demonstrate how to use the Join method to query a DataSet using the method query syntax. The FillDataSet method used in these examples is specified in Loading Data Into a DataSet. The examples in this topic use the Contact, Address, Product, SalesOrderHeader, and SalesOrderDetail tables in the AdventureWorks sample ...
7 wrz 2023 · Those of you who remember your databases will notice that the LINQ join we performed is the equivalent of an inner join in SQL. In other words, only items that have a match are returned. In SQL, the equivalent query would look like this: SELECT p.Id, p.Name, c.Name AS Category FROM products AS p JOIN categories AS c ON p.CategoryId = c.Id
