When to use the var keyword and the var keyword

When to use the var keyword and the var keyword

C # keywords come along with. NET 3.5 and later, along with anonymous functions and LINQ. the compiler will help us deduce the specific types. In general, when a variable is a local variable (excluding Class-level variables) and initialized during declaration, it is the premise to use the var keyword. When to use it and when not to use it.

 

1. Use the var keyword when declaring an anonymous Function

Var temp = new {Name = "", Category = ""};

 

2. The var keyword is used when the result of the anonymous function is projected by LINQ.

Var temp = from p in products
Where p. Name = "something"
Select new {p. Name, p. Category };

 

3. Use the var keyword when the type is clear

Var string = "";
Var result = new List <Product> ();

We can infer the type from the right of the equal sign. You can use the var keyword.

 

4. Use the var keyword with caution when the type is not clear

Var result = ProductRepository. GetProducts ();

If the var keyword is used, the readability is a little worse.