最近要研究winform(2.0)的控件和vc++ 2008的控件,先做的是winform控件.
随便找了个CheckedListBox来看看,本来预计20分钟搞定一个自定义List的绑定,然后捉出勾选的内容,结果用了25分钟完成.
后来想了解多点CheckedListBox的属性和功能,就上了MSDN查CheckedListBox类,查到了一个"示例",使用方法比较全面,可是没有自定义List的绑定和捉出勾选内容的部分,郁闷.
现在把两部分都贴出来,供日后使用哪个和参考.
一.网上找到的
１．checkedlistbox的绑定
CheckedListBox应该是由ListBox扩展而来的？但在使用的时候，可能会发现——它不支持DataSource属性，不能像ListBox那样指定其数据源为一个DataTable。
事实上，CheckedListBox像ListBox一样有DataSource属性，DisplayMember和ValueMemeber属性也都是有的，只是IntelliSense不能将其智能感知出来。
因此，我们可以通过代码将CheckedListBox绑定．
eg：
this.checklbUser.DataSource = ds.Tables["table１"];
this.checklbUser.DisplayMember = "UserName";
this.checklbUser.ValueMember = "UserID";
２．如何获取checkedlistbox的DisplayMember和ValueMember
for(int i=0; i < checklbUser.Items.Count; i )
{
if(checklbUser.GetItemChecked(i)==true)
{
MessageBox.Show(checklbUser.GetItemText(checklbUser.Items[i]));//获取DisplayMember
MessageBox.Show( ds.Tables["table１"].Rows[i]["UserID"].ToString() );//获取ValueMember
//其实上面用ds捉出数据,未免太牵强了.
}
}
二.微软找到的示例.开一个winformApplication,把program.cs的内容清空,贴上下面的代码,自己看咯.
namespace WindowsApplication1
{
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.IO ;
public class Form1 : System.Windows.Forms.Form
{
private System.Windows.Forms.CheckedListBox checkedListBox1;
private System.Windows.Forms.TextBox textBox1;
private System.Windows.Forms.Button button1;
private System.Windows.Forms.Button button2;
private System.Windows.Forms.ListBox listBox1;
private System.Windows.Forms.Button button3;
private System.ComponentModel.Container components;
public Form1()
{
InitializeComponent();
// Sets up the initial objects in the CheckedListBox.
string[] myFruit = {"Apples", "Oranges","Tomato"};
checkedListBox1.Items.AddRange(myFruit);
// Changes the selection mode from double-click to single click.
checkedListBox1.CheckOnClick = true;
}
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}
private void InitializeComponent()
{
this.components = new System.ComponentModel.Container();
this.textBox1 = new System.Windows.Forms.TextBox();
this.checkedListBox1 = new System.Windows.Forms.CheckedListBox();
this.listBox1 = new System.Windows.Forms.ListBox();
this.button1 = new System.Windows.Forms.Button();
this.button2 = new System.Windows.Forms.Button();
this.button3 = new System.Windows.Forms.Button();
this.textBox1.Location = new System.Drawing.Point(144, 64);
this.textBox1.Size = new System.Drawing.Size(128, 20);
this.textBox1.TabIndex = 1;
this.textBox1.TextChanged += new System.EventHandler(this.textBox1_TextChanged);
this.checkedListBox1.Location = new System.Drawing.Point(16, 64);
this.checkedListBox1.Size = new System.Drawing.Size(120, 184);
this.checkedListBox1.TabIndex = 0;
this.checkedListBox1.ItemCheck += new System.Windows.Forms.ItemCheckEventHandler(this.checkedListBox1_ItemCheck);
this.listBox1.Location = new System.Drawing.Point(408, 64);
this.listBox1.Size = new System.Drawing.Size(128, 186);
this.listBox1.TabIndex = 3;
this.button1.Enabled = false;
this.button1.Location = new System.Drawing.Point(144, 104);
this.button1.Size = new System.Drawing.Size(104, 32);
this.button1.TabIndex = 2;
this.button1.Text = "Add Fruit";
this.button1.Click += new System.EventHandler(this.button1_Click);
this.button2.Enabled = false;
this.button2.Location = new System.Drawing.Point(288, 64);
this.button2.Size = new System.Drawing.Size(104, 32);
this.button2.TabIndex = 2;
this.button2.Text = "Show Order";
this.button2.Click += new System.EventHandler(this.button2_Click);
this.button3.Enabled = false;
this.button3.Location = new System.Drawing.Point(288, 104);
this.button3.Size = new System.Drawing.Size(104, 32);
this.button3.TabIndex = 2;
this.button3.Text = "Save Order";
this.button3.Click += new System.EventHandler(this.button3_Click);
this.ClientSize = new System.Drawing.Size(563, 273);
this.Controls.AddRange(new System.Windows.Forms.Control[] {this.listBox1,
this.button3,
this.button2,
this.button1,
this.textBox1,
this.checkedListBox1});
this.Text = "Fruit Order";
}
[STAThread]
public static void Main(string[] args)
{
Application.Run(new Form1());
}
// Adds the string if the text box has data in it.
private void button1_Click(object sender, System.EventArgs e)
{
if(textBox1.Text != "")
{
if(checkedListBox1.CheckedItems.Contains(textBox1.Text)== false)
checkedListBox1.Items.Add(textBox1.Text,CheckState.Checked);
textBox1.Text = "";
}
}
// Activates or deactivates the Add button.
private void textBox1_TextChanged(object sender, System.EventArgs e)
{
if (textBox1.Text == "")
{
button1.Enabled = false;
}
else
{
button1.Enabled = true;
}
}
// Moves the checked items from the CheckedListBox to the listBox.
private void button2_Click(object sender, System.EventArgs e)
{
listBox1.Items.Clear();
button3.Enabled=false;
for (int i=0; i< checkedListBox1.CheckedItems.Count;i++)
{
listBox1.Items.Add(checkedListBox1.CheckedItems[i]);
}
if (listBox1.Items.Count>0)
button3.Enabled=true;
}
// Activates the move button if there are checked items.
private void checkedListBox1_ItemCheck(object sender, ItemCheckEventArgs e)
{
if(e.NewValue==CheckState.Unchecked)
{
if(checkedListBox1.CheckedItems.Count==1)
{
button2.Enabled = false;
}
}
else
{
button2.Enabled = true;
}
}
// Saves the items to a file.
private void button3_Click(object sender, System.EventArgs e)
{
// Insert code to save a file.
listBox1.Items.Clear();
IEnumerator myEnumerator;
myEnumerator = checkedListBox1.CheckedIndices.GetEnumerator();
int y;
while (myEnumerator.MoveNext() != false)
{
y =(int) myEnumerator.Current;
checkedListBox1.SetItemChecked(y, false);
}
button3.Enabled = false ;
}
}
}