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If you are allowed to use LINQ, take a look at the following example. It creates two DataTables with integer columns, fills them with some records, join them using LINQ query and outputs them to Console.
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.
Example to Understand LINQ Join Method: The following example code demonstrates how to perform an inner join between two collections, customers and orders, based on a common key (CustomerId in orders matching Id in customers). The aim is to pair each order with the name of the customer who made it.
The basic syntax of a LINQ join is as follows: c. var result = from left in leftTable. join right in rightTable on left.Id equals right.Id. select new { left.Name, right.Value }; In this example, we are joining the `leftTable` and `rightTable` tables on the `Id` column.
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 · Joining Tables using the Join() Extension Method. With Entity Framework Core we can use the Join() extension method from the System.Linq library. What the Join method does is to correlate (or join) elements of two sequences using based on matching keys. Let us look at an example on how to join two tables using Entity Framework Core and the Join ...
7 wrz 2023 · LINQ Inner Join With Where Condition. Performing a join with a where clause is quite easy. In this example, we’ll perform an inner join, filtering only the products whose id are equal to or greater than 3:
