ListView.ListViewItemSorter Propriedade

public:
 property System::Collections::IComparer ^ ListViewItemSorter { System::Collections::IComparer ^ get(); void set(System::Collections::IComparer ^ value); };

[System.ComponentModel.Browsable(false)]
public System.Collections.IComparer ListViewItemSorter { get; set; }

[System.ComponentModel.Browsable(false)]
public System.Collections.IComparer? ListViewItemSorter { get; set; }

[<System.ComponentModel.Browsable(false)>]
member this.ListViewItemSorter : System.Collections.IComparer with get, set

Public Property ListViewItemSorter As IComparer

Valor da propriedade

Um IComparer que representa o comparador de classificação para o controle.

Atributos

BrowsableAttribute

Exemplos

O exemplo de código a seguir cria um formulário que contém um ListView controle que classifica manualmente os itens quando uma coluna no ListView controle é clicada. O exemplo define uma classe chamada ListViewItemComparer que implementa a System.Collections.IComparer interface que executa a ListViewItem comparação. O exemplo cria uma instância de ListViewItemComparer e a usa para definir a ListViewItemSorter propriedade do ListView controle. A Sort chamada de método no ColumnClick manipulador de eventos usa os métodos definidos em ListViewItemComparer para executar o tipo de itens, com base na coluna clicada.

#using <System.dll>
#using <System.Drawing.dll>
#using <System.Windows.Forms.dll>

using namespace System;
using namespace System::Windows::Forms;
using namespace System::Drawing;
using namespace System::Collections;

// Implements the manual sorting of items by columns.
ref class ListViewItemComparer: public IComparer
{
private:
   int col;

public:
   ListViewItemComparer()
   {
      col = 0;
   }

   ListViewItemComparer( int column )
   {
      col = column;
   }

   virtual int Compare( Object^ x, Object^ y )
   {
      return String::Compare( (dynamic_cast<ListViewItem^>(x))->SubItems[ col ]->Text,
                              (dynamic_cast<ListViewItem^>(y))->SubItems[ col ]->Text );
   }
};

public ref class ListViewSortForm: public Form
{
private:
   ListView^ listView1;

public:
   ListViewSortForm()
   {
      // Create ListView items to add to the control.
      array<String^>^temp0 = {"Banana","a","b","c"};
      ListViewItem^ listViewItem1 = gcnew ListViewItem( temp0,-1,Color::Empty,Color::Yellow,nullptr );
      array<String^>^temp1 = {"Cherry","v","g","t"};
      ListViewItem^ listViewItem2 = gcnew ListViewItem( temp1,-1,Color::Empty,Color::Red,
                 gcnew System::Drawing::Font( "Microsoft Sans Serif",8.25F,FontStyle::Regular,GraphicsUnit::Point,0 ) );
      array<String^>^temp2 = {"Apple","h","j","n"};
      ListViewItem^ listViewItem3 = gcnew ListViewItem( temp2,-1,Color::Empty,Color::Lime,nullptr );
      array<String^>^temp3 = {"Pear","y","u","i"};
      ListViewItem^ listViewItem4 = gcnew ListViewItem( temp3,-1,Color::Empty,Color::FromArgb( 192, 128, 156 ),nullptr );

      //Initialize the ListView control and add columns to it.
      this->listView1 = gcnew ListView;

      // Set the initial sorting type for the ListView.
      this->listView1->Sorting = SortOrder::None;

      // Disable automatic sorting to enable manual sorting.
      this->listView1->View = View::Details;

      // Add columns and set their text.
      this->listView1->Columns->Add( gcnew ColumnHeader );
      this->listView1->Columns[ 0 ]->Text = "Column 1";
      this->listView1->Columns[ 0 ]->Width = 100;
      listView1->Columns->Add( gcnew ColumnHeader );
      listView1->Columns[ 1 ]->Text = "Column 2";
      listView1->Columns->Add( gcnew ColumnHeader );
      listView1->Columns[ 2 ]->Text = "Column 3";
      listView1->Columns->Add( gcnew ColumnHeader );
      listView1->Columns[ 3 ]->Text = "Column 4";

      // Suspend control logic until form is done configuring form.
      this->SuspendLayout();

      // Add Items to the ListView control.
      array<ListViewItem^>^temp4 = {listViewItem1,listViewItem2,listViewItem3,listViewItem4};
      this->listView1->Items->AddRange( temp4 );

      // Set the location and size of the ListView control.
      this->listView1->Location = Point(10,10);
      this->listView1->Name = "listView1";
      this->listView1->Size = System::Drawing::Size( 300, 100 );
      this->listView1->TabIndex = 0;

      // Enable editing of the items in the ListView.
      this->listView1->LabelEdit = true;

      // Connect the ListView::ColumnClick event to the ColumnClick event handler.
      this->listView1->ColumnClick += gcnew ColumnClickEventHandler( this, &ListViewSortForm::ColumnClick );

      // Initialize the form.
      this->ClientSize = System::Drawing::Size( 400, 400 );
      array<Control^>^temp5 = {this->listView1};
      this->Controls->AddRange( temp5 );
      this->Name = "ListViewSortForm";
      this->Text = "Sorted ListView Control";

      // Resume lay[Out] of* the form.
      this->ResumeLayout( false );
   }

private:

   // ColumnClick event handler.
   void ColumnClick( Object^ /*o*/, ColumnClickEventArgs^ e )
   {
      // Set the ListViewItemSorter property to a new ListViewItemComparer 
      // object. Setting this property immediately sorts the 
      // ListView using the ListViewItemComparer object.
      this->listView1->ListViewItemSorter = gcnew ListViewItemComparer( e->Column );
   }
};

[System::STAThreadAttribute]
int main()
{
   Application::Run( gcnew ListViewSortForm );
}

using System;
using System.Windows.Forms;
using System.Drawing;
using System.Collections;

namespace ListViewSortFormNamespace
{

    public class ListViewSortForm : Form
    {
        private ListView listView1;
       
        public ListViewSortForm()
        {
            // Create ListView items to add to the control.
            ListViewItem listViewItem1 = new ListViewItem(new string[] {"Banana","a","b","c"}, -1, Color.Empty, Color.Yellow, null);
            ListViewItem listViewItem2 = new ListViewItem(new string[] {"Cherry","v","g","t"}, -1, Color.Empty, Color.Red, new Font("Microsoft Sans Serif", 8.25F, FontStyle.Regular, GraphicsUnit.Point, ((System.Byte)(0))));
            ListViewItem listViewItem3 = new ListViewItem(new string[] {"Apple","h","j","n"}, -1, Color.Empty, Color.Lime, null);
            ListViewItem listViewItem4 = new ListViewItem(new string[] {"Pear","y","u","i"}, -1, Color.Empty, Color.FromArgb(((System.Byte)(192)), ((System.Byte)(128)), ((System.Byte)(156))), null);
     
            //Initialize the ListView control and add columns to it.
            this.listView1 = new ListView();

            // Set the initial sorting type for the ListView.
            this.listView1.Sorting = SortOrder.None;
            // Disable automatic sorting to enable manual sorting.
            this.listView1.View = View.Details;
            // Add columns and set their text.
            this.listView1.Columns.Add(new ColumnHeader());
            this.listView1.Columns[0].Text = "Column 1";
            this.listView1.Columns[0].Width = 100;
            listView1.Columns.Add(new ColumnHeader());
            listView1.Columns[1].Text = "Column 2";
            listView1.Columns.Add(new ColumnHeader());
            listView1.Columns[2].Text = "Column 3";
            listView1.Columns.Add(new ColumnHeader());
            listView1.Columns[3].Text = "Column 4";
            // Suspend control logic until form is done configuring form.
            this.SuspendLayout();
            // Add Items to the ListView control.
            this.listView1.Items.AddRange(new ListViewItem[] {listViewItem1,
                listViewItem2,
                listViewItem3,
                listViewItem4});
            // Set the location and size of the ListView control.
            this.listView1.Location = new Point(10, 10);
            this.listView1.Name = "listView1";
            this.listView1.Size = new Size(300, 100);
            this.listView1.TabIndex = 0;
            // Enable editing of the items in the ListView.
            this.listView1.LabelEdit = true;
            // Connect the ListView.ColumnClick event to the ColumnClick event handler.
            this.listView1.ColumnClick += new ColumnClickEventHandler(ColumnClick);
            
            // Initialize the form.
            this.ClientSize = new Size(400, 400);
            this.Controls.AddRange(new Control[] {this.listView1});
            this.Name = "ListViewSortForm";
            this.Text = "Sorted ListView Control";
            // Resume layout of the form.
            this.ResumeLayout(false);
        }

        // ColumnClick event handler.
        private void ColumnClick(object o, ColumnClickEventArgs e)
        {
            // Set the ListViewItemSorter property to a new ListViewItemComparer 
            // object. Setting this property immediately sorts the 
            // ListView using the ListViewItemComparer object.
            this.listView1.ListViewItemSorter = new ListViewItemComparer(e.Column);
        }

        [System.STAThreadAttribute()]
        public static void Main()
        {
            Application.Run(new ListViewSortForm());
        }
    }

    // Implements the manual sorting of items by columns.
    class ListViewItemComparer : IComparer
    {
        private int col;
        public ListViewItemComparer()
        {
            col = 0;
        }
        public ListViewItemComparer(int column)
        {
            col = column;
        }
        public int Compare(object x, object y)
        {
            return String.Compare(((ListViewItem)x).SubItems[col].Text, ((ListViewItem)y).SubItems[col].Text);
        }
    }
}

Imports System.Windows.Forms
Imports System.Drawing
Imports System.Collections


Namespace ListViewSortFormNamespace

    Public Class ListViewSortForm
        Inherits Form

        Private listView1 As ListView

        Public Sub New()
            ' Create ListView items to add to the control.
            Dim listViewItem1 As New ListViewItem(New String() {"Banana", "a", "b", "c"}, -1, Color.Empty, Color.Yellow, Nothing)
            Dim listViewItem2 As New ListViewItem(New String() {"Cherry", "v", "g", "t"}, -1, Color.Empty, Color.Red, New Font("Microsoft Sans Serif", 8.25F, FontStyle.Regular, GraphicsUnit.Point, CType(0, System.Byte)))
            Dim listViewItem3 As New ListViewItem(New String() {"Apple", "h", "j", "n"}, -1, Color.Empty, Color.Lime, Nothing)
            Dim listViewItem4 As New ListViewItem(New String() {"Pear", "y", "u", "i"}, -1, Color.Empty, Color.FromArgb(CType(192, System.Byte), CType(128, System.Byte), CType(156, System.Byte)), Nothing)

            'Initialize the ListView control and add columns to it.
            Me.listView1 = New ListView

            ' Set the initial sorting type for the ListView.
            Me.listView1.Sorting = SortOrder.None
            ' Disable automatic sorting to enable manual sorting.
            Me.listView1.View = View.Details
            ' Add columns and set their text.
            Me.listView1.Columns.Add(New ColumnHeader)
            Me.listView1.Columns(0).Text = "Column 1"
            Me.listView1.Columns(0).Width = 100
            listView1.Columns.Add(New ColumnHeader)
            listView1.Columns(1).Text = "Column 2"
            listView1.Columns.Add(New ColumnHeader)
            listView1.Columns(2).Text = "Column 3"
            listView1.Columns.Add(New ColumnHeader)
            listView1.Columns(3).Text = "Column 4"
            ' Suspend control logic until form is done configuring form.
            Me.SuspendLayout()
            ' Add Items to the ListView control.
            Me.listView1.Items.AddRange(New ListViewItem() {listViewItem1, listViewItem2, listViewItem3, listViewItem4})
            ' Set the location and size of the ListView control.
            Me.listView1.Location = New Point(10, 10)
            Me.listView1.Name = "listView1"
            Me.listView1.Size = New Size(300, 100)
            Me.listView1.TabIndex = 0
            ' Enable editing of the items in the ListView.
            Me.listView1.LabelEdit = True
            ' Connect the ListView.ColumnClick event to the ColumnClick event handler.
            AddHandler Me.listView1.ColumnClick, AddressOf ColumnClick

            ' Initialize the form.
            Me.ClientSize = New Size(400, 400)
            Me.Controls.AddRange(New Control() {Me.listView1})
            Me.Name = "ListViewSortForm"
            Me.Text = "Sorted ListView Control"
            ' Resume layout of the form.
            Me.ResumeLayout(False)
        End Sub


        ' ColumnClick event handler.
        Private Sub ColumnClick(ByVal o As Object, ByVal e As ColumnClickEventArgs)
            ' Set the ListViewItemSorter property to a new ListViewItemComparer 
            ' object. Setting this property immediately sorts the 
            ' ListView using the ListViewItemComparer object.
            Me.listView1.ListViewItemSorter = New ListViewItemComparer(e.Column)
        End Sub

    End Class

    ' Implements the manual sorting of items by columns.
    Class ListViewItemComparer
        Implements IComparer

        Private col As Integer

        Public Sub New()
            col = 0
        End Sub

        Public Sub New(ByVal column As Integer)
            col = column
        End Sub

        Public Function Compare(ByVal x As Object, ByVal y As Object) As Integer _
           Implements IComparer.Compare
            Return [String].Compare(CType(x, ListViewItem).SubItems(col).Text, CType(y, ListViewItem).SubItems(col).Text)
        End Function
    End Class
End Namespace

Comentários

A ListViewItemSorter propriedade permite especificar o objeto que executa a classificação de itens em um ListView controle quando o Sort método é chamado ou quando os itens são adicionados à lista. Observe que os itens não são classificados automaticamente quando o texto do rótulo é alterado.

O objeto especificado deve ser uma instância de uma classe que implementa a IComparer interface , que tem um único método chamado Comparer.Compare.

Você pode usar essa propriedade para fornecer classificação personalizada, por exemplo, quando um cabeçalho de coluna é clicado na exibição de detalhes. Para fazer isso, crie uma classe que implemente a IComparer interface e forneça um construtor que aceite o índice de uma coluna para classificar. Em seguida, você pode implementar um manipulador para o ColumnClick evento que cria uma instância dessa classe usando o índice da coluna clicada. Quando você define a ListViewItemSorter propriedade como a nova instância, o ListView controle é classificado automaticamente usando o objeto especificado. Chamadas subsequentes para o Sort método usam o mesmo objeto.

Aplica-se a

Confira também

• IComparer
• ColumnClick