ListViewItem.Checked-Eigenschaft
Ruft einen Wert ab, der angibt, ob das Element aktiviert ist, oder legt diesen fest.
Namespace: System.Windows.Forms
Assembly: System.Windows.Forms (in system.windows.forms.dll)
Syntax
'Declaration
Public Property Checked As Boolean
'Usage
Dim instance As ListViewItem
Dim value As Boolean
value = instance.Checked
instance.Checked = value
public bool Checked { get; set; }
public:
property bool Checked {
bool get ();
void set (bool value);
}
/** @property */
public boolean get_Checked ()
/** @property */
public void set_Checked (boolean value)
public function get Checked () : boolean
public function set Checked (value : boolean)
Eigenschaftenwert
true, wenn das Element aktiviert ist, andernfalls false. Der Standardwert ist false.
Hinweise
Diese Eigenschaft ist nur dann sinnvoll, wenn die CheckBoxes-Eigenschaft des ListView-Steuerelements, in dem sich das Element befindet, auf true festgelegt ist. Mithilfe dieser Eigenschaft kann bestimmt werden, ob das Element vom Benutzer oder durch Code zur Laufzeit aktiviert wurde. Mit der CheckedItems-Eigenschaft können alle aktivierten Elemente in einem ListView-Steuerelement bestimmt werden. Wenn bei einem aktivierten Element eine bestimmte Aktion durchgeführt werden soll, können sie einen Eventhandler für die ItemCheck-Eigenschaft des ListView-Steuerelements erstellen.
Beispiel
Im folgenden Codebeispiel wird ein ListView-Steuerelement mit drei angegebenen ListViewItem-Objekten erstellt, und für jedes Element werden drei ListViewItem.ListViewSubItem-Objekte angegeben. Außerdem werden ColumnHeader-Objekte zum Anzeigen der Unterelemente in der Detailansicht erstellt. Darüber hinaus werden in dem Codebeispiel zwei ImageList-Objekte erstellt, um Bilder für die ListViewItem-Objekte bereitzustellen. Diese ImageList-Objekte werden der LargeImageList-Eigenschaft und der SmallImageList-Eigenschaft hinzugefügt. In diesem Beispiel werden die folgenden Eigenschaften zum Erstellen des ListView-Steuerelements verwendet:
CheckBoxes
Der Code muss einem Form hinzugefügt werden, und die im Beispiel erstellte Methode muss vom Konstruktor oder einer anderen Methode im Formular aufgerufen werden. Des Weiteren müssen für das Beispiel die Bilder MySmallImage1, MySmallImage2, MyLargeImage1 und MyLargeImage2 im Stammverzeichnis von Laufwerk C vorhanden sein.
Private Sub CreateMyListView()
' Create a new ListView control.
Dim listView1 As New ListView()
listView1.Bounds = New Rectangle(New Point(10, 10), New Size(300, 200))
' Set the view to show details.
listView1.View = View.Details
' Allow the user to edit item text.
listView1.LabelEdit = True
' Allow the user to rearrange columns.
listView1.AllowColumnReorder = True
' Display check boxes.
listView1.CheckBoxes = True
' Select the item and subitems when selection is made.
listView1.FullRowSelect = True
' Display grid lines.
listView1.GridLines = True
' Sort the items in the list in ascending order.
listView1.Sorting = SortOrder.Ascending
' Create three items and three sets of subitems for each item.
Dim item1 As New ListViewItem("item1", 0)
' Place a check mark next to the item.
item1.Checked = True
item1.SubItems.Add("1")
item1.SubItems.Add("2")
item1.SubItems.Add("3")
Dim item2 As New ListViewItem("item2", 1)
item2.SubItems.Add("4")
item2.SubItems.Add("5")
item2.SubItems.Add("6")
Dim item3 As New ListViewItem("item3", 0)
' Place a check mark next to the item.
item3.Checked = True
item3.SubItems.Add("7")
item3.SubItems.Add("8")
item3.SubItems.Add("9")
' Create columns for the items and subitems.
listView1.Columns.Add("Item Column", -2, HorizontalAlignment.Left)
listView1.Columns.Add("Column 2", -2, HorizontalAlignment.Left)
listView1.Columns.Add("Column 3", -2, HorizontalAlignment.Left)
listView1.Columns.Add("Column 4", -2, HorizontalAlignment.Center)
'Add the items to the ListView.
listView1.Items.AddRange(New ListViewItem() {item1, item2, item3})
' Create two ImageList objects.
Dim imageListSmall As New ImageList()
Dim imageListLarge As New ImageList()
' Initialize the ImageList objects with bitmaps.
imageListSmall.Images.Add(Bitmap.FromFile("C:\MySmallImage1.bmp"))
imageListSmall.Images.Add(Bitmap.FromFile("C:\MySmallImage2.bmp"))
imageListLarge.Images.Add(Bitmap.FromFile("C:\MyLargeImage1.bmp"))
imageListLarge.Images.Add(Bitmap.FromFile("C:\MyLargeImage2.bmp"))
'Assign the ImageList objects to the ListView.
listView1.LargeImageList = imageListLarge
listView1.SmallImageList = imageListSmall
' Add the ListView to the control collection.
Me.Controls.Add(listView1)
End Sub 'CreateMyListView
private void CreateMyListView()
{
// Create a new ListView control.
ListView listView1 = new ListView();
listView1.Bounds = new Rectangle(new Point(10,10), new Size(300,200));
// Set the view to show details.
listView1.View = View.Details;
// Allow the user to edit item text.
listView1.LabelEdit = true;
// Allow the user to rearrange columns.
listView1.AllowColumnReorder = true;
// Display check boxes.
listView1.CheckBoxes = true;
// Select the item and subitems when selection is made.
listView1.FullRowSelect = true;
// Display grid lines.
listView1.GridLines = true;
// Sort the items in the list in ascending order.
listView1.Sorting = SortOrder.Ascending;
// Create three items and three sets of subitems for each item.
ListViewItem item1 = new ListViewItem("item1",0);
// Place a check mark next to the item.
item1.Checked = true;
item1.SubItems.Add("1");
item1.SubItems.Add("2");
item1.SubItems.Add("3");
ListViewItem item2 = new ListViewItem("item2",1);
item2.SubItems.Add("4");
item2.SubItems.Add("5");
item2.SubItems.Add("6");
ListViewItem item3 = new ListViewItem("item3",0);
// Place a check mark next to the item.
item3.Checked = true;
item3.SubItems.Add("7");
item3.SubItems.Add("8");
item3.SubItems.Add("9");
// Create columns for the items and subitems.
listView1.Columns.Add("Item Column", -2, HorizontalAlignment.Left);
listView1.Columns.Add("Column 2", -2, HorizontalAlignment.Left);
listView1.Columns.Add("Column 3", -2, HorizontalAlignment.Left);
listView1.Columns.Add("Column 4", -2, HorizontalAlignment.Center);
//Add the items to the ListView.
listView1.Items.AddRange(new ListViewItem[]{item1,item2,item3});
// Create two ImageList objects.
ImageList imageListSmall = new ImageList();
ImageList imageListLarge = new ImageList();
// Initialize the ImageList objects with bitmaps.
imageListSmall.Images.Add(Bitmap.FromFile("C:\\MySmallImage1.bmp"));
imageListSmall.Images.Add(Bitmap.FromFile("C:\\MySmallImage2.bmp"));
imageListLarge.Images.Add(Bitmap.FromFile("C:\\MyLargeImage1.bmp"));
imageListLarge.Images.Add(Bitmap.FromFile("C:\\MyLargeImage2.bmp"));
//Assign the ImageList objects to the ListView.
listView1.LargeImageList = imageListLarge;
listView1.SmallImageList = imageListSmall;
// Add the ListView to the control collection.
this.Controls.Add(listView1);
}
private:
void CreateMyListView()
{
// Create a new ListView control.
ListView^ listView1 = gcnew ListView;
listView1->Bounds = Rectangle(Point(10,10),System::Drawing::Size( 300, 200 ));
// Set the view to show details.
listView1->View = View::Details;
// Allow the user to edit item text.
listView1->LabelEdit = true;
// Allow the user to rearrange columns.
listView1->AllowColumnReorder = true;
// Display check boxes.
listView1->CheckBoxes = true;
// Select the item and subitems when selection is made.
listView1->FullRowSelect = true;
// Display grid lines.
listView1->GridLines = true;
// Sort the items in the list in ascending order.
listView1->Sorting = SortOrder::Ascending;
// Create three items and three sets of subitems for each item.
ListViewItem^ item1 = gcnew ListViewItem( "item1",0 );
// Place a check mark next to the item.
item1->Checked = true;
item1->SubItems->Add( "1" );
item1->SubItems->Add( "2" );
item1->SubItems->Add( "3" );
ListViewItem^ item2 = gcnew ListViewItem( "item2",1 );
item2->SubItems->Add( "4" );
item2->SubItems->Add( "5" );
item2->SubItems->Add( "6" );
ListViewItem^ item3 = gcnew ListViewItem( "item3",0 );
// Place a check mark next to the item.
item3->Checked = true;
item3->SubItems->Add( "7" );
item3->SubItems->Add( "8" );
item3->SubItems->Add( "9" );
// Create columns for the items and subitems.
listView1->Columns->Add( "Item Column", -2, HorizontalAlignment::Left );
listView1->Columns->Add( "Column 2", -2, HorizontalAlignment::Left );
listView1->Columns->Add( "Column 3", -2, HorizontalAlignment::Left );
listView1->Columns->Add( "Column 4", -2, HorizontalAlignment::Center );
//Add the items to the ListView.
array<ListViewItem^>^temp1 = {item1,item2,item3};
listView1->Items->AddRange( temp1 );
// Create two ImageList objects.
ImageList^ imageListSmall = gcnew ImageList;
ImageList^ imageListLarge = gcnew ImageList;
// Initialize the ImageList objects with bitmaps.
imageListSmall->Images->Add( Bitmap::FromFile( "C:\\MySmallImage1.bmp" ) );
imageListSmall->Images->Add( Bitmap::FromFile( "C:\\MySmallImage2.bmp" ) );
imageListLarge->Images->Add( Bitmap::FromFile( "C:\\MyLargeImage1.bmp" ) );
imageListLarge->Images->Add( Bitmap::FromFile( "C:\\MyLargeImage2.bmp" ) );
//Assign the ImageList objects to the ListView.
listView1->LargeImageList = imageListLarge;
listView1->SmallImageList = imageListSmall;
// Add the ListView to the control collection.
this->Controls->Add( listView1 );
}
private void CreateMyListView()
{
// Create a new ListView control.
ListView listView1 = new ListView();
listView1.set_Bounds(new Rectangle(new Point(10, 10),
new Size(300, 200)));
// Set the view to show details.
listView1.set_View(View.Details);
// Allow the user to edit item text.
listView1.set_LabelEdit(true);
// Allow the user to rearrange columns.
listView1.set_AllowColumnReorder(true);
// Display check boxes.
listView1.set_CheckBoxes(true);
// Select the item and subitems when selection is made.
listView1.set_FullRowSelect(true);
// Display grid lines.
listView1.set_GridLines(true);
// Sort the items in the list in ascending order.
listView1.set_Sorting(SortOrder.Ascending);
// Create three items and three sets of subitems for each item.
ListViewItem item1 = new ListViewItem("item1", 0);
// Place a check mark next to the item.
item1.set_Checked(true);
item1.get_SubItems().Add("1");
item1.get_SubItems().Add("2");
item1.get_SubItems().Add("3");
ListViewItem item2 = new ListViewItem("item2", 1);
item2.get_SubItems().Add("4");
item2.get_SubItems().Add("5");
item2.get_SubItems().Add("6");
ListViewItem item3 = new ListViewItem("item3", 0);
// Place a check mark next to the item.
item3.set_Checked(true);
item3.get_SubItems().Add("7");
item3.get_SubItems().Add("8");
item3.get_SubItems().Add("9");
// Create columns for the items and subitems.
listView1.get_Columns().Add("Item Column", -2,
HorizontalAlignment.Left);
listView1.get_Columns().Add("Column 2", -2, HorizontalAlignment.Left);
listView1.get_Columns().Add("Column 3", -2, HorizontalAlignment.Left);
listView1.get_Columns().Add("Column 4", -2, HorizontalAlignment.Center);
//Add the items to the ListView.
listView1.get_Items().AddRange(new ListViewItem[] { item1, item2,
item3 });
// Create two ImageList objects.
ImageList imageListSmall = new ImageList();
ImageList imageListLarge = new ImageList();
// Initialize the ImageList objects with bitmaps.
imageListSmall.get_Images().Add(Bitmap.FromFile(
"C:\\MySmallImage1.bmp"));
imageListSmall.get_Images().Add(Bitmap.FromFile(
"C:\\MySmallImage2.bmp"));
imageListLarge.get_Images().Add(Bitmap.FromFile(
"C:\\MyLargeImage1.bmp"));
imageListLarge.get_Images().Add(Bitmap.FromFile(
"C:\\MyLargeImage2.bmp"));
//Assign the ImageList objects to the ListView.
listView1.set_LargeImageList(imageListLarge);
listView1.set_SmallImageList(imageListSmall);
// Add the ListView to the control collection.
this.get_Controls().Add(listView1);
} //CreateMyListView
Plattformen
Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile für Pocket PC, Windows Mobile für Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
.NET Framework unterstützt nicht alle Versionen sämtlicher Plattformen. Eine Liste der unterstützten Versionen finden Sie unter Systemanforderungen.
Versionsinformationen
.NET Framework
Unterstützt in: 2.0, 1.1, 1.0
.NET Compact Framework
Unterstützt in: 2.0, 1.0
Siehe auch
Referenz
ListViewItem-Klasse
ListViewItem-Member
System.Windows.Forms-Namespace
ListView.CheckBoxes-Eigenschaft
ListView.ItemCheck-Ereignis
ListView.CheckedItems-Eigenschaft