Linq Select Top 1

Written By Kendrasaint Saturday, February 19, 2022 Add Comment Edit

So its better to avoid the select N1 problem in Entity Framework we need to make use of Include Method it helps to build a single query with required data using Join clause and this is the most resourceful way as compared to executing queries multiple times. In your case code sample given below will be useful to update many properties var persons from p in Contextperson_account_portfolio where pperson_name personName select p.

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TableA In method syntax with other operators.

. Essentially you already are selecting all columns the select then transforms that to the columns you care about so you can even do things like. LINQ queries return enumerable collections of strongly typed objects. TO update using foreach foreachvar person in persons update property values.

From row in TableA select row Or just. In LINQ you are allowed to sort the multiple fields of the collection in the single query and each field is separated by a comma. Lets see the sample program with the use of LINQ_Include.

TableAWhererow rowIsInteresting no Select returns the whole row. The entire source of the article in C and VBNET can be downloaded over here Github. Another powerful query clause is the Select clause which enables you to return only selected fields from the data source.

LINQ to DB has 15 repositories available. It removes the mismatch between programming languages and databases and the syntax used to create a query is the same no matter which type of data source is used. A query can return a collection of anonymous types or named types.

The VBNET code has been translated using a C to VBNET Converting tool. LINQ to XML is an amazing API and I hope this set of examples has demonstrated that. It gives the ability to NET languages to generate queries to retrieve data from the data source.

You can use the Select clause to return only a single field from the data source. LINQ is known as Language Integrated Query and it is introduced in NET 35. Follow their code on GitHub.

So no need to scare to use foreach for update the linq result. When you perform multiple sorting the collection first sort according to the first condition and then if the two fields in the given collection are similar then it would sort the second field and so on.

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