Dark Horse programmer-set and Indexer

Indexer

Classes, structures, or interfaces are used as Arrays for convenience.

The indexer is used to encapsulate internal sets or arrays.

Definition syntax

[Access modifier] return type this [index type index name]

{

// Get or set method body

}

An index is an attribute.

The index can be used to obtain the item with the key or the serial number with the item.

 

Set has strong versatility (method names should be remembered)

Add

Add and AddRange

Remove

Remove, RemoveAt

Clear

Clear

Sort

Sort, Reverse

Search

IndexOf, LastIndexOf

Deposit Determination

Contains

Total number of sets

Count attribute

Light Replication

Clone

 

Index

The set can also be accessed through "subscript", called Index

 

Namespace Indexer

{

Class Program

{

Static void Main (string [] args)

{

MyCollection mc = new MyCollection ();

Int [] nums = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };

// Added features

Mc. Add (1, 100 );

Mc. AddRange (nums );

// Insert, add a 100

Mc. Insert (1, 3,100 );

// Remove

// Mc. Remove (100 );

Mc. RemoveAt (2 );

 

// Clear

// Mc. Clear ();

// Read data at 3

Console. WriteLine (mc [2]);

 

Console. ReadKey ();

}

}

 

// Manually write a set

Class MyCollection

{

// Int [] nums;

ArrayList al;

// Method used for testing

Private void Test ()

{

This. Clear ();

// This is inside the class, indicating the current instance

// This [3];

}

 

// Index

// The essence of the index is the attribute; the essence of the attribute is the method.

Public object this [int index]

{

Get {return al [index];}

Set {al [index] = value ;}

}

 

Public MyCollection ()

{

Al = new ArrayList ();

}

 

// Add Method

// The worst way

# Region bad Method

// Public int Add (int num)

//{

// If (nums = null)

//{

// Nums = new int [] {num };

//}

// Else

//{

// Int [] temp = new int [nums. Length + 1];

// For (int I = 0; I <nums. Length; I ++)

//{

// Temp [I] = nums [I];

//}

// Temp [temp. Length-1] = num;

// Nums = temp;

//}

// Return nums. Length + 1;

//}

# Endregion

 

Public int Add (object o)

{

Return al. Add (0 );

}

Public void AddRange (ICollection ic)

{

Al. AddRange (ic );

}

 

Public void Remove (object o)

{

Al. Remove (o );

}

Public void RemoveAt (int index)

{

Al. RemoveAt (index );

}

 

Public void Clear ()

{

Al. Clear ();

}

 

Public void Insert (int index, object o)

{

Al. Insert (index, o );

}

}

}