ListBox.Sort 方法

定义

ListBox 中的项排序。Sorts the items in the ListBox.

protected:
 virtual void Sort();
protected virtual void Sort ();
abstract member Sort : unit -> unit
override this.Sort : unit -> unit
Protected Overridable Sub Sort ()

示例

下面的代码示例演示如何使用 Sort 方法。The following code example demonstrates using the Sort method. 该示例演示如何从 ListBox 类继承并重写派生类中的 Sort 方法,以执行用户定义的排序。The example demonstrates inheriting from the ListBox class and overriding the Sort method in the derived class to perform a user-defined sort. 若要运行此示例,请将以下代码粘贴到一个空窗体中。To run this example paste the following code in an empty form.

// 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

注解

如果 trueSorted 属性,Sort 强制集合将每个项重新添加到其自身。Sort forces the collection to add each item back to itself if the Sorted property is true. 然后,每个项都将插入到正确的位置。Each item is then inserted into the correct position.

继承者说明

您可以在派生类中重写此方法,以提供您自己的排序例程。You can override this method in your derived class to provide your own sorting routine. 通过将 Sorted 属性设置为 true,访问重写的 Sort() 方法的结果。Access the results of the overridden Sort() method by setting the Sorted property to true. ListBox添加项时,先对项进行排序并添加新项会更有效。When adding items to a ListBox, it is more efficient to sort the items first and then add new items.

适用于

另请参阅