ListBox.Sort Método
Definición
Importante
Parte de la información hace referencia a la versión preliminar del producto, que puede haberse modificado sustancialmente antes de lanzar la versión definitiva. Microsoft no otorga ninguna garantía, explícita o implícita, con respecto a la información proporcionada aquí.
Ordena los elementos del ListBox.
protected:
virtual void Sort();protected virtual void Sort ();abstract member Sort : unit -> unit
override this.Sort : unit -> unitProtected Overridable Sub Sort ()Ejemplos
En el ejemplo de código siguiente se muestra el uso del Sort método . En el ejemplo se muestra cómo heredar de la ListBox clase y reemplazar el Sort método en la clase derivada para realizar una ordenación definida por el usuario. Para ejecutar este ejemplo, pegue el código siguiente en un formulario vacío.
// The following code example demonstrates using the ListBox.Sort method
// by inheriting from the ListBox class and overriding the Sort method.
using namespace System::Drawing;
using namespace System::Windows::Forms;
// This class inherits from ListBox and implements a different
// sorting method. Sort will be called by setting the class's Sorted
// property to True.
public ref class SortByLengthListBox: public ListBox
{
public:
SortByLengthListBox()
: ListBox()
{}
protected:
// Overrides the parent class Sort to perform a simple
// bubble sort on the length of the string contained in each item.
virtual void Sort() override
{
if ( Items->Count > 1 )
{
bool swapped;
do
{
int counter = Items->Count - 1;
swapped = false;
while ( counter > 0 )
{
// Compare the items' length.
if ( Items[ counter ]->ToString()->Length < Items[ counter - 1 ]->ToString()->Length )
{
// Swap the items.
Object^ temp = Items[ counter ];
Items[ counter ] = Items[ counter - 1 ];
Items[ counter - 1 ] = temp;
swapped = true;
}
// Decrement the counter.
counter -= 1;
}
}
while ( (swapped == true) );
}
}
};
public ref class Form1: public System::Windows::Forms::Form
{
internal:
System::Windows::Forms::Button^ Button1;
SortByLengthListBox^ sortingBox;
public:
Form1()
: Form()
{
this->Button1 = gcnew System::Windows::Forms::Button;
this->sortingBox = gcnew SortByLengthListBox;
this->SuspendLayout();
this->Button1->Location = System::Drawing::Point( 64, 16 );
this->Button1->Name = "Button1";
this->Button1->Size = System::Drawing::Size( 176, 23 );
this->Button1->TabIndex = 0;
this->Button1->Text = "Click me for list sorted by length";
this->Button1->Click += gcnew System::EventHandler( this, &Form1::Button1_Click );
array<Object^>^temp0 = {"System","System.Windows.Forms","System.Xml","System.Net","System.Drawing","System.IO"};
this->sortingBox->Items->AddRange( temp0 );
this->sortingBox->Location = System::Drawing::Point( 72, 48 );
this->sortingBox->Size = System::Drawing::Size( 120, 95 );
this->sortingBox->TabIndex = 1;
this->ClientSize = System::Drawing::Size( 292, 266 );
this->Controls->Add( this->sortingBox );
this->Controls->Add( this->Button1 );
this->Name = "Form1";
this->Text = "Sort Example";
this->ResumeLayout( false );
}
private:
void Button1_Click( System::Object^ /*sender*/, System::EventArgs^ /*e*/ )
{
// Set the Sorted property to True to raise the overridden Sort
// method.
sortingBox->Sorted = true;
}
};
int main()
{
Application::Run( gcnew Form1 );
}
// The following code example demonstrates using the ListBox.Sort method
// by inheriting from the ListBox class and overriding the Sort method.
using System.Drawing;
using System.Windows.Forms;
public class Form1:
System.Windows.Forms.Form
{
internal System.Windows.Forms.Button Button1;
internal SortByLengthListBox sortingBox;
public Form1() : base()
{
this.Button1 = new System.Windows.Forms.Button();
this.sortingBox =
new SortByLengthListBox();
this.SuspendLayout();
this.Button1.Location = new System.Drawing.Point(64, 16);
this.Button1.Name = "Button1";
this.Button1.Size = new System.Drawing.Size(176, 23);
this.Button1.TabIndex = 0;
this.Button1.Text = "Click me for list sorted by length";
this.Button1.Click += new System.EventHandler(Button1_Click);
this.sortingBox.Items.AddRange(new object[]{"System",
"System.Windows.Forms", "System.Xml", "System.Net",
"System.Drawing", "System.IO"});
this.sortingBox.Location =
new System.Drawing.Point(72, 48);
this.sortingBox.Size =
new System.Drawing.Size(120, 95);
this.sortingBox.TabIndex = 1;
this.ClientSize = new System.Drawing.Size(292, 266);
this.Controls.Add(this.sortingBox);
this.Controls.Add(this.Button1);
this.Name = "Form1";
this.Text = "Sort Example";
this.ResumeLayout(false);
}
public static void Main()
{
Application.Run(new Form1());
}
private void Button1_Click(System.Object sender, System.EventArgs e)
{
// Set the Sorted property to True to raise the overridden Sort
// method.
sortingBox.Sorted = true;
}
}
// This class inherits from ListBox and implements a different
// sorting method. Sort will be called by setting the class's Sorted
// property to True.
public class SortByLengthListBox:
ListBox
{
public SortByLengthListBox() : base()
{
}
// Overrides the parent class Sort to perform a simple
// bubble sort on the length of the string contained in each item.
protected override void Sort()
{
if (Items.Count > 1)
{
bool swapped;
do
{
int counter = Items.Count - 1;
swapped = false;
while (counter > 0)
{
// Compare the items' length.
if (Items[counter].ToString().Length
< Items[counter-1].ToString().Length)
{
// Swap the items.
object temp = Items[counter];
Items[counter] = Items[counter-1];
Items[counter-1] = temp;
swapped = true;
}
// Decrement the counter.
counter -= 1;
}
}
while((swapped==true));
}
}
}
Imports System.Drawing
Imports System.Windows.Forms
Public Class Form1
Inherits System.Windows.Forms.Form
Public Sub New()
MyBase.New()
Me.Button1 = New System.Windows.Forms.Button
Me.SortByLengthListBox1 = New SortByLengthListBox
Me.SuspendLayout()
Me.Button1.Location = New System.Drawing.Point(64, 16)
Me.Button1.Name = "Button1"
Me.Button1.Size = New System.Drawing.Size(176, 23)
Me.Button1.TabIndex = 0
Me.Button1.Text = "Click me for list sorted by length"
Me.SortByLengthListBox1.Items.AddRange(New Object() {"System", _
"System.Windows.Forms", "System.Xml", _
"System.Net", "System.Drawing", "System.IO"})
Me.SortByLengthListBox1.Location = New System.Drawing.Point(72, 48)
Me.SortByLengthListBox1.Name = "SortByLengthListBox1"
Me.SortByLengthListBox1.Size = New System.Drawing.Size(120, 95)
Me.SortByLengthListBox1.TabIndex = 1
Me.ClientSize = New System.Drawing.Size(292, 266)
Me.Controls.Add(Me.SortByLengthListBox1)
Me.Controls.Add(Me.Button1)
Me.Name = "Form1"
Me.Text = "Sort Example"
Me.ResumeLayout(False)
End Sub
Friend WithEvents Button1 As System.Windows.Forms.Button
Friend WithEvents SortByLengthListBox1 As SortByLengthListBox
Public Shared Sub Main()
Application.Run(New Form1)
End Sub
Private Sub Button1_Click(ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles Button1.Click
' Set the Sorted property to True to raise the overridden Sort
' method.
SortByLengthListBox1.Sorted = True
End Sub
End Class
' This class inherits from ListBox and implements a different
' sorting method. Sort will be called by setting the class's Sorted
' property to True.
Public Class SortByLengthListBox
Inherits ListBox
Public Sub New()
MyBase.New()
End Sub
' Overrides the parent class Sort to perform a simple
' bubble sort on the length of the string contained in each item.
Protected Overrides Sub Sort()
If (Items.Count > 1) Then
Dim swapped As Boolean
Do
Dim counter As Integer = Items.Count - 1
swapped = False
While (counter > 0)
' Compare the items' length.
If Items(counter).ToString.Length < _
Items(counter - 1).ToString.Length Then
' If true, swap the items.
Dim temp As Object = Items(counter)
Items(counter) = Items(counter - 1)
Items(counter - 1) = temp
swapped = True
End If
' Decrement the counter.
counter -= 1
End While
Loop While (swapped = True)
End If
End Sub
End Class
Comentarios
Sort obliga a la colección a agregar cada elemento a sí mismo si la Sorted propiedad es true. A continuación, cada elemento se inserta en la posición correcta.
Notas a los desarrolladores de herederos
Puede invalidar este método en la clase derivada para proporcionar su propia rutina de ordenación. Obtenga acceso a los resultados del método invalidado Sort() estableciendo la Sorted propiedad en true. Al agregar elementos a , ListBoxes más eficaz ordenar los elementos primero y, a continuación, agregar nuevos elementos.