C # custom class libraries and Custom Controls

 

Differences between Class Library and Windows Form Control Library:

Both of them generate dll files, but the control library is a special class library. The control library can be compiled and run, while the class library can only be compiled. It must be referenced in other projects that can be used as "Start up project.

Method to reference the Class Library: In Solution Explorer, right-click the References of the project, select "Add reference", and select browse to find the corresponding DLL to Add

To use the custom control library, right-click the Toolbox and select "choose items". In the displayed dialog box, click "Browse" to add the control library. After the Toolbox is added, a custom control is displayed at the bottom of the Toolbox.

Create your own class library

See http://hi.baidu.com/hongyueer/blog/item/ce3b39a618133e92d143582d.html

1. Create a project and select the Class Library type.

2. Select the namespace name.

3. Create your own public classes. The Code is as follows:

Using System;

Using System. Collections. Generic;

Using System. Text;

 

Namespace Chapter09

{

Public class Box

{

Private string [] names = {"length", "width", "height "};

Private double [] dimensions = new double [3];

Public Box (double length, double width, double height)

{

Dimensions [0] = length;

Dimensions [1] = width;

Dimensions [2] = height;

}

Public double this [int index]

{

Get

{

If (index <0) | (index> = dimensions. Length ))

Return-1;

Else

Return dimensions [index];

}

Set

{

If (index> = 0 & index <dimensions. Length)

Dimensions [index] = value;

}

}

 

Public double this [string name]

{

Get

{

Int I = 0;

While (I <names. Length) & (name. ToLower ()! = Names [I])

I ++;

Return (I = names. Length )? -1: dimensions [I];

}

Set

{

Int I = 0;

While (I <names. Length) & (name. ToLower ()! = Names [I])

I ++;

If (I! = Names. Length)

Dimensions [I] = value;

}

}

}

}

5. Test your own class library

First, add a reference to your class library. (create a project, right-click the project and add a reference, select the "Browse" tab, find your dll file, and add it .)

Then, use using to include your namespace and you can use your class. The Code is as follows:

Using System;

Using System. Collections. Generic;

Using System. Text;

Using Chapter09;

 

Namespace Test_classLib

{

Class Program

{

Static void Main (string [] args)

{

Box box = new Box (20, 30, 40 );

 

Console. WriteLine ("Created a box :");

Console. WriteLine ("box [0] = {0}", box [0]);

Console. WriteLine ("box [1] = {0}", box [1]);

Console. WriteLine ("box [0] = {0}", box ["length"]);

Console. WriteLine ("box [\" width \ "] = {0}", box ["width"]);

}

}

}

Note: The use of the C # indexer is also demonstrated in this example.

 

From Shine's holy heaven-Min Chen 〃