CheckBoxList controls in WinForm similar to WebForm

web| control a few days ago, in the. NET Technology Forum saw a post, I seem to remember how to implement the WinForm in a similar webform in the CheckBoxList control, I simply implemented a control like that

First, you have to build a control project, if you say:

Next, you add a class: Checkboxcollection, which is the collection class for a checkbox

The specific code is as follows

CheckBoxCollection.cs

Using System;
Using System.Collections;
Using System.Windows.Forms;

Namespace Checklistcontrol
{
<summary>
Collection Class for CheckBox
</summary>
public class CheckBoxCollection:System.Collections.CollectionBase
{
Public Checkboxcollection ()
{
IList Pilist=base. List;
}

Public CheckBox This[int Index]
{
Get
{
Return (CheckBox) List[index];
}
}
Public checkbox Add (checkbox obj)
{
Base. List.add (obj);
return obj;
}

public void Remove (CheckBox obj)
{
Base. List.remove (obj);
}
}
}


Then, in the CheckBoxList.cs file, define the global variable

Private checkboxcollection objcbc=new checkboxcollection ();

public event System.EventHandler CheckedChanged;

Write a custom function, external interface



<summary>
Add a checkbox to a control
</summary>
<returns></returns>
Public CheckBox Newcheckbox ()
{
Lab. Visible=false;
CheckBox cb=new checkbox ();
Cb. Name=getname ();
Cb. TEXT=CB. Name;
Cb. Size=new Size (120,24);
Cb. Checked=false;
Cb. Visible=true;
Cb. Checkedchanged+=new EventHandler (checkbox_checkedchanged);//define CheckedChanged event to catch its event
int y=0;
Y=objcbc.count * + objcbc.count * 8 + 12;//to form the ordinate of the checkbox
Cb. Location=new Point (12,y);
Objcbc.add (CB);

This. Controls.Add (CB);//Add checkbox to control

int x=getmaxwidth ()///Get the maximum width of the checkbox that has been added

if (CB). Width >x)//If the maximum width of the checkbox added now is greater than the maximum width that has been added, replace the X
{
x = cb. Width + 24;
}

This. Size=new size (x, y +12+24);//change the size of the control based on the added checkbox

return CB;
}

<summary>
Automatically form the name of the newly added checkbox
</summary>
<returns></returns>
private String GetName ()
{
if (objcbc.count>0)
{
ArrayList list=new ArrayList ();
for (int i=0;i<objcbc.count;i++)
{
if (objcbc[i). Name.trim (). LENGTH==9)
{
String Str=objcbc[i]. Name.trim ();
if (str. Substring (0,8). ToLower () = = "checkbox" && isnumber (str. Substring (str. length-1,1)))
{
List. ADD (str. Substring (str. length-1,1));
}
}
}
if (list. COUNT&GT;0)
{
Return "CheckBox" + convert.tostring (int. Parse (list[list. COUNT-1]. ToString (). Trim ()) + 1);
}
}

return "CheckBox1";
}

<summary>
Judge whether it is an Arabic numeral
</summary>
<param name= "Strcompare" ></param>
<returns></returns>
private bool Isnumber (string strcompare)
{
String strword= "0123456789";
foreach (char chr in Strword)
{
if (STRCOMPARE==CHR. ToString ())
{
return true;
}
}
return false;
}

<summary>
Get the maximum width of the checkbox that has been added
</summary>
<returns></returns>
private int Getmaxwidth ()
{
int maxwidth=0;
if (objcbc.count>0)
{
for (int i=0;i<objcbc.count;i++)
{
CheckBox cb= (checkbox) objcbc[i];
if (CB). Width>maxwidth)
{
MAXWIDTH=CB. Width;
}
}
}
return maxwidth;
}

[Browsable (True), Description ("Get checkbox Set"), Category ("Checklist")]
Public Checkboxcollection Checklist
// {
Get
// {
return OBJCBC;
// }
// }

private void CheckBox_CheckedChanged (object sender, EventArgs e)
{
CheckedChanged (Sender,new EventArgs ());
}



After compiling, we can get CheckListControl.dll;

To add a new project to a test for a class



-> Add/Remove items in the toolbox, add Checklistcontrol, and drag Checklistcontrol to Form1

In Form1.cs

private void Form1_Load (object sender, System.EventArgs e)
{
CheckBox Cb=checkboxlist1.newcheckbox ();
Cb. Name= "Chkfirst";
Cb. text= "First checkbox";
Cb. Size=new Size (125,24);
Cb=checkboxlist1.newcheckbox ();
Cb. Name= "Chksecond";
Cb. text= "Second checkbox";
Cb. Size=new Size (125,24);
}

private void Checkboxlist1_checkedchanged (object sender, System.EventArgs e)
{
CheckBox cb= (checkbox) sender;
MessageBox.Show ("Name:" + cb). Name + "Text:" +CB. Text);
}

That's exactly what it is.

In fact, just made a simple checkboxlist, a lot of other functions did not add, I hope users to correct, add more features