CheckState (Enumeración)
Actualización: noviembre 2007
Especifica el estado de un control, como una casilla de verificación, que puede activarse, desactivarse o establecerse en un estado indeterminado.
Ensamblado: System.Windows.Forms (en System.Windows.Forms.dll)
Varios métodos de CheckBox, CheckedListBox y ItemCheckEventArgs utilizan esta enumeración.
Nota:
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Utilice un control con activación indeterminada cuando no desee establecer un valor predeterminado. |
En el siguiente código de ejemplo se muestra el uso de la enumeración CheckState.
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 ; } } }
import System.*;
import System.Drawing.*;
import System.Collections.*;
import System.ComponentModel.*;
import System.Windows.Forms.*;
import System.Data.*;
import System.IO.*;
public class Form1 extends 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.get_Items().AddRange(myFruit);
// Changes the selection mode from double-click to single click.
checkedListBox1.set_CheckOnClick(true);
} //Form1
protected void Dispose(boolean disposing)
{
if (disposing) {
if (components != null) {
components.Dispose();
}
}
super.Dispose(disposing);
} //Dispose
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.set_Location(new System.Drawing.Point(144, 64));
this.textBox1.set_Size(new System.Drawing.Size(128, 20));
this.textBox1.set_TabIndex(1);
this.textBox1.add_TextChanged(new System.EventHandler(
this.textBox1_TextChanged));
this.checkedListBox1.set_Location(new System.Drawing.Point(16, 64));
this.checkedListBox1.set_Size(new System.Drawing.Size(120, 184));
this.checkedListBox1.set_TabIndex(0);
this.checkedListBox1.add_ItemCheck(
new System.Windows.Forms.ItemCheckEventHandler(
this.checkedListBox1_ItemCheck));
this.listBox1.set_Location(new System.Drawing.Point(408, 64));
this.listBox1.set_Size(new System.Drawing.Size(128, 186));
this.listBox1.set_TabIndex(3);
this.button1.set_Enabled(false);
this.button1.set_Location(new System.Drawing.Point(144, 104));
this.button1.set_Size(new System.Drawing.Size(104, 32));
this.button1.set_TabIndex(2);
this.button1.set_Text("Add Fruit");
this.button1.add_Click(new System.EventHandler(this.button1_Click));
this.button2.set_Enabled(false);
this.button2.set_Location(new System.Drawing.Point(288, 64));
this.button2.set_Size(new System.Drawing.Size(104, 32));
this.button2.set_TabIndex(2);
this.button2.set_Text("Show Order");
this.button2.add_Click(new System.EventHandler(this.button2_Click));
this.button3.set_Enabled(false);
this.button3.set_Location(new System.Drawing.Point(288, 104));
this.button3.set_Size(new System.Drawing.Size(104, 32));
this.button3.set_TabIndex(2);
this.button3.set_Text("Save Order");
this.button3.add_Click(new System.EventHandler(this.button3_Click));
this.set_ClientSize(new System.Drawing.Size(563, 273));
this.get_Controls().AddRange(new System.Windows.Forms.Control[] {
this.listBox1, this.button3, this.button2, this.button1,
this.textBox1, this.checkedListBox1});
this.set_Text("Fruit Order");
} //InitializeComponent
/** @attribute STAThread()
*/
public static void main(String[] args)
{
Application.Run(new Form1());
} //main
// Adds the string if the text box has data in it.
private void button1_Click(Object sender, System.EventArgs e)
{
if (!textBox1.get_Text().Equals("")) {
if (checkedListBox1.get_CheckedItems().Contains(textBox1.get_Text())
== false) {
checkedListBox1.get_Items().Add(textBox1.get_Text(),
CheckState.Checked);
}
textBox1.set_Text("");
}
} //button1_Click
// Activates or deactivates the Add button.
private void textBox1_TextChanged(Object sender, System.EventArgs e)
{
if (textBox1.get_Text().Equals("")) {
button1.set_Enabled(false);
}
else {
button1.set_Enabled(true);
}
} //textBox1_TextChanged
// Moves the checked items from the CheckedListBox to the listBox.
private void button2_Click(Object sender, System.EventArgs e)
{
listBox1.get_Items().Clear();
button3.set_Enabled(false);
for (int i = 0; i < checkedListBox1.get_CheckedItems().get_Count();
i++) {
listBox1.get_Items().Add(
checkedListBox1.get_CheckedItems().get_Item(i));
}
if (listBox1.get_Items().get_Count() > 0) {
button3.set_Enabled(true);
}
} //button2_Click
// Activates the move button if there are checked items.
private void checkedListBox1_ItemCheck(Object sender, ItemCheckEventArgs e)
{
if (e.get_NewValue().Equals(CheckState.Unchecked)) {
if (checkedListBox1.get_CheckedItems().get_Count() == 1) {
button2.set_Enabled(false);
}
}
else {
button2.set_Enabled(true);
}
} //checkedListBox1_ItemCheck
// Saves the items to a file.
private void button3_Click(Object sender, System.EventArgs e)
{
// Insert code to save a file.
listBox1.get_Items().Clear();
IEnumerator myEnumerator;
myEnumerator = checkedListBox1.get_CheckedIndices().GetEnumerator();
int y;
while ((myEnumerator.MoveNext() != false)) {
y = (int)(System.Convert.ToInt32(myEnumerator.get_Current()));
checkedListBox1.SetItemChecked(y, false);
}
button3.set_Enabled(false);
} //button3_Click
} //Form1
Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile para Smartphone, Windows Mobile para Pocket PC
.NET Framework y .NET Compact Framework no admiten todas las versiones de cada plataforma. Para obtener una lista de las versiones compatibles, vea Requisitos de sistema de .NET Framework.
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