C # typical generic example

 

Function parameters are called polymorphism. Can the parameter types of a function be determined?

Can a function return only one value? Is the return value of the function uncertain?

Generic is a special type that delays the work of a specified type until the client Code declares and instantiates a class or method.

The following are two classic examples:

 

1. Enter a string and convert it to the desired type.

With the wildcard feature, the returned value can be of the specified type.

2. Compare two objects and return a large value.

Using System;

Using System. Collections. Generic;

Using System. Text;

 

Namespace FamilyManage

{

Class CGeneric

{

// Data Conversion

Static public T Convert <T> (string s) where T: IConvertible

{

Return (T) System. Convert. ChangeType (s, typeof (T ));

}

// Take one of the two large numbers

Static public T Max <T> (T first, T second) where T: IComparable <T>

{

If (first. CompareTo (second)> 0)

Return first;

 

Return second;

}

// Use

Static public void test ()

{

//

Int iMax = Max (123,456 );

Double dMax = Max <double> (1.23, 4.56); // you can specify the return type.

//

Int iConvert = Convert <int> ("123456 ");

Float fConvert = Convert <float> ("123.456 ");

//

System. Windows. Forms. MessageBox. Show (iMax + "|" + dMax + "|" + iConvert + "|" + fConvert );

}

}

}