Accessing Form public property with var

[rg0920]

I am new to c#, I am wondering why is it that if I use var type to create new Form instance I am able to access a public property, but cannot see the property if I use Form type?

var form = new Form1(); // I am able to access public property


Form form = new Form1(); // I cannot access public property

 

[Skydiver]

That's because Form is the base type of Form1. Form will not have any of the properties that Form1 has. Change your code to:

Form1 form = new Form1();

When you use var, the compiler knows to make the form the correct Form1 type.

 

[JohnH]

var means type is inferred, implicitly typed, from what is assigned.

Declaration statements - local variables and constants, var, local reference variables (ref locals) - C# reference

Declaration statements introduce a new local variable, local constant, or local reference variable (ref local). Local variables can be explicitly or implicitly typed. A declaration statement can also include initialization of a variable's value.

docs.microsoft.com

An implicitly typed local variable is strongly typed just as if you had declared the type yourself, but the compiler determines the type.

Implicitly typed local variables - C#

The var keyword in C# instructs the compiler to infer the type of the variable from the expression on the right side of the initialization statement.

docs.microsoft.com

The var keyword instructs the compiler to infer the type of the variable from the expression on the right side of the initialization statement.