ListBox.Sort Methode

Referenz

Definition

Namespace:: System.Windows.Forms

Assembly:: System.Windows.Forms.dll

Wichtig

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Sortiert die Elemente in der ListBox.

protected:
 virtual void Sort();

protected virtual void Sort ();

abstract member Sort : unit -> unit
override this.Sort : unit -> unit

Protected Overridable Sub Sort ()

Beispiele

Im folgenden Codebeispiel wird die Verwendung der Sort Methode veranschaulicht. Das Beispiel veranschaulicht das Erben von der ListBox Klasse und überschreiben die Sort Methode in der abgeleiteten Klasse, um eine benutzerdefinierte Sortierung auszuführen. Um dieses Beispiel auszuführen, fügen Sie den folgenden Code in ein leeres Formular ein.

// 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

Hinweise

Sort erzwingt die Auflistung, jedes Element wieder zu sich selbst hinzuzufügen, wenn die Sorted Eigenschaft ist true. Jedes Element wird dann an die richtige Position eingefügt.

Hinweise für Vererber

Sie können diese Methode in Ihrer abgeleiteten Klasse außer Kraft setzen, um Ihre eigene Sortierroutine bereitzustellen. Greifen Sie auf die Ergebnisse der überschriebenen Sort() Methode zu, indem Sie die Sorted Eigenschaft auf truefestlegen. Beim Hinzufügen von Elementen zu einem ListBox, ist es effizienter, die Elemente zuerst zu sortieren und dann neue Elemente hinzuzufügen.

Gilt für

Siehe auch

Sorted

Teilen über