What are the basics of LINQ query

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Basic knowledge of LINQ query

1. The pronunciation of LINQ: (1) lin k (2) lin Q

2. Key words of LINQ: from, select, in, where, group by, order by...

3. Note to LINQ: it must end with select or group by.

4. Semantics of LINQ:

◆ from temporary variable in collection object or database object

◆ where conditional expression [order by condition]

Queried value in ◆ select temporary variable [group by condition]

The type of value returned by a LINQ query is the type of temporary variable, which may be an object or a collection. And the LINQ query expression was compiled the last time the object was created. LINQ queries are usually used in conjunction with the var keyword (what is var? Anonymous object). The following two query expressions have the same effect:

Var Q = from name in methods where (name.Name.Length > 15) select name; IEnumerable p = from name in methods where (name.Name.Length > 15) select name

So we can nest LINQ query expressions in this way:

Var Q = from t in (from name in methods where (! name.IsVirtual) select name) where (t.Name.Length > 15) select t.Name

5. The full name of LINQ: Language-Integrated Query

6. Classification of LINQ: LINQ to Object, LINQ to XML, LINQ to SQL, LINQ to ADO.NET

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