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This article is about what Linq query expressions are like. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

Linq query expression

As a result, the language design team designed a syntax more similar to SQL, called Linq query expressions. For example, the Linq query expression for our example could look like this:

Var locals = from c in customers where c.ZipCode = = 91822 select new {FullName = c.FirstName + "" + c.LastName, HomeAddress = c.Address}

Linq query expressions are built on the basis of the above language functions. In terms of syntax, they are completely transformed into the basic syntax that we have seen. For example, the above query can be converted directly to:

Var locals = customers.Where (c = > c.ZipCode = = 91822) .Select (c = > new {FullName = c.FirstName + "" + c.LastName, HomeAddress = c.Address})

Linq query expressions support many different "clauses", such as from, where, select, orderby, group by, let, and join. These clauses are first converted to equivalent operator calls, which are then implemented by extension methods. If the query syntax does not support clauses of the necessary operators, the close relationship between the query clause and the extension method that implements the operator makes it easy to combine the two. For example:

Var locals = (from c in customers where c.ZipCode = = 91822 select new {

FullName = c.FirstName + "" + c.LastName, HomeAddress = c.Address}) .count ()

In this way, we have managed to achieve the initial goal at the end (I am always very satisfied with this).

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