Shulou(Shulou.com)06/02 Report--

In this issue, the editor will bring you about the purpose and means of LINQ query. The article is rich in content and analyzed and described from a professional point of view. I hope you can get something after reading this article.

The LINQ query finds the appropriate data elements from the data source, and then sorts, joins and so on the elements of these queries as needed. Query is a very important operation in the database and the basis of other operations.

The LINQ query contains the following main elements:

◆ data source: the data source represents where the LINQ query will look for data, which is usually one or more datasets, each containing a series of elements. A dataset is an object of type IEnumerable or IQueryable that can be enumerated to traverse each element. In addition, its elements can be of any data type, so it can represent any collection of data.

◆ target data: the elements in the data source are not necessarily the results required by the query. The target data is used to specify exactly what data the query wants. In LINQ, it defines the specific types of elements in the query result dataset.

◆ filter criteria: the filter criteria define the filter criteria for elements in the data source. Only elements that meet the criteria are returned as query results. Filter conditions can be expressed by simple logical expressions or by functions with complex logic.

◆ additional operations: additional operations indicate some other specific operations. For example, grouping query results and so on.

Among them, the data source and target database are the necessary elements of LINQ query, and the filter criteria and additional operations are optional elements.

The above is the purpose and implementation of the LINQ query shared by the editor. If you happen to have similar doubts, you might as well refer to the above analysis to understand. If you want to know more about it, you are welcome to follow the industry information channel.

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