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I need to do a LINQ2DataSet query that does a join on more than one field (as. var result = from x in entity join y in entity2 on x.field1 = y.field1 and x.field2 = y.field2
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.
In this article, we’ll take a look at how to use LINQ to join multiple tables on multiple conditions. We’ll start by discussing the basics of LINQ joins, and then we’ll show you how to use LINQ to join tables on different columns, on the same column, and on multiple columns.
7 wrz 2023 · LINQ Inner Join With Multiple Conditions. If you want to use multiple conditions within your join, you can simply use more than one where clause. Let’s update our query once again:
4 wrz 2022 · With the LINQ to SQL approach, we can use our knowledge of basic LINQ queries to construct a query that joins data from two or more tables as shown below: var query = (from b in _db.Books join l in db.Loans on b.ID equals l.BookID);
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.
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.)
