ListView.SelectedIndices 属性
定义
重要
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获取控件中选定项的索引。
public:
property System::Windows::Forms::ListView::SelectedIndexCollection ^ SelectedIndices { System::Windows::Forms::ListView::SelectedIndexCollection ^ get(); };[System.ComponentModel.Browsable(false)]
public System.Windows.Forms.ListView.SelectedIndexCollection SelectedIndices { get; }[<System.ComponentModel.Browsable(false)>]
member this.SelectedIndices : System.Windows.Forms.ListView.SelectedIndexCollectionPublic ReadOnly Property SelectedIndices As ListView.SelectedIndexCollection属性值
ListView.SelectedIndexCollection，包含选定的项的索引。 如果当前没有选定的项，则返回空 ListView.SelectedIndexCollection。
- 属性
示例
下面的代码示例演示如何使用 SelectedIndices、 SelectedIndexChanged和 HeaderStyle 成员和 ListView.SelectedIndexCollection 类。 若要运行此示例，请将以下代码粘贴到包含 ListView 名为 ListView1 的对象和名为 的 TextBoxTextBox1窗体中。
InitializeListView从窗体的构造函数或 Load 方法调用 方法。 此示例要求事件处理程序与 事件正确关联 SelectedIndexChanged 。
// This method adds two columns to the ListView, setting the Text
// and TextAlign, and Width properties of each ColumnHeader. The
// HeaderStyle property is set to NonClickable since the ColumnClick
// event is not handled. Finally the method adds ListViewItems and
// SubItems to each column.
void InitializeListView()
{
this->ListView1 = gcnew System::Windows::Forms::ListView;
this->ListView1->BackColor = System::Drawing::SystemColors::Control;
this->ListView1->Dock = System::Windows::Forms::DockStyle::Top;
this->ListView1->Location = System::Drawing::Point( 0, 0 );
this->ListView1->Name = "ListView1";
this->ListView1->Size = System::Drawing::Size( 292, 130 );
this->ListView1->TabIndex = 0;
this->ListView1->View = System::Windows::Forms::View::Details;
this->ListView1->MultiSelect = true;
this->ListView1->HideSelection = false;
this->ListView1->HeaderStyle = ColumnHeaderStyle::Nonclickable;
ColumnHeader^ columnHeader1 = gcnew ColumnHeader;
columnHeader1->Text = "Breakfast Item";
columnHeader1->TextAlign = HorizontalAlignment::Left;
columnHeader1->Width = 146;
ColumnHeader^ columnHeader2 = gcnew ColumnHeader;
columnHeader2->Text = "Price Each";
columnHeader2->TextAlign = HorizontalAlignment::Center;
columnHeader2->Width = 142;
this->ListView1->Columns->Add( columnHeader1 );
this->ListView1->Columns->Add( columnHeader2 );
array<String^>^foodList = {"Juice","Coffee","Cereal & Milk","Fruit Plate","Toast & Jelly","Bagel & Cream Cheese"};
array<String^>^foodPrice = {"1.09","1.09","2.19","2.49","1.49","1.49"};
for ( int count = 0; count < foodList->Length; count++ )
{
ListViewItem^ listItem = gcnew ListViewItem( foodList[ count ] );
listItem->SubItems->Add( foodPrice[ count ] );
ListView1->Items->Add( listItem );
}
this->Controls->Add( ListView1 );
}
// This method adds two columns to the ListView, setting the Text
// and TextAlign, and Width properties of each ColumnHeader. The
// HeaderStyle property is set to NonClickable since the ColumnClick
// event is not handled. Finally the method adds ListViewItems and
// SubItems to each column.
private void InitializeListView()
{
this.ListView1 = new System.Windows.Forms.ListView();
this.ListView1.BackColor = System.Drawing.SystemColors.Control;
this.ListView1.Dock = System.Windows.Forms.DockStyle.Top;
this.ListView1.Location = new System.Drawing.Point(0, 0);
this.ListView1.Name = "ListView1";
this.ListView1.Size = new System.Drawing.Size(292, 130);
this.ListView1.TabIndex = 0;
this.ListView1.View = System.Windows.Forms.View.Details;
this.ListView1.MultiSelect = true;
this.ListView1.HideSelection = false;
this.ListView1.HeaderStyle = ColumnHeaderStyle.Nonclickable;
ColumnHeader columnHeader1 = new ColumnHeader();
columnHeader1.Text = "Breakfast Item";
columnHeader1.TextAlign = HorizontalAlignment.Left;
columnHeader1.Width = 146;
ColumnHeader columnHeader2 = new ColumnHeader();
columnHeader2.Text = "Price Each";
columnHeader2.TextAlign = HorizontalAlignment.Center;
columnHeader2.Width = 142;
this.ListView1.Columns.Add(columnHeader1);
this.ListView1.Columns.Add(columnHeader2);
string[] foodList = new string[]{"Juice", "Coffee",
"Cereal & Milk", "Fruit Plate", "Toast & Jelly",
"Bagel & Cream Cheese"};
string[] foodPrice = new string[]{"1.09", "1.09", "2.19",
"2.49", "1.49", "1.49"};
for(int count=0; count < foodList.Length; count++)
{
ListViewItem listItem = new ListViewItem(foodList[count]);
listItem.SubItems.Add(foodPrice[count]);
ListView1.Items.Add(listItem);
}
this.Controls.Add(ListView1);
}
' This method adds two columns to the ListView, setting the Text
' and TextAlign, and Width properties of each ColumnHeader. The
' HeaderStyle property is set to NonClickable since the ColumnClick
' event is not handled. Finally the method adds ListViewItems and
' SubItems to each column.
Private Sub InitializeListView()
Me.ListView1 = New System.Windows.Forms.ListView
Me.ListView1.BackColor = System.Drawing.SystemColors.Control
Me.ListView1.Dock = System.Windows.Forms.DockStyle.Top
Me.ListView1.Location = New System.Drawing.Point(0, 0)
Me.ListView1.Name = "ListView1"
Me.ListView1.Size = New System.Drawing.Size(292, 130)
Me.ListView1.TabIndex = 0
Me.ListView1.View = System.Windows.Forms.View.Details
Me.ListView1.MultiSelect = True
Me.ListView1.HideSelection = False
ListView1.HeaderStyle = ColumnHeaderStyle.Nonclickable
Dim columnHeader1 As New ColumnHeader
With columnHeader1
.Text = "Breakfast Item"
.TextAlign = HorizontalAlignment.Left
.Width = 146
End With
Dim columnHeader2 As New ColumnHeader
With columnHeader2
.Text = "Price Each"
.TextAlign = HorizontalAlignment.Center
.Width = 142
End With
Me.ListView1.Columns.Add(columnHeader1)
Me.ListView1.Columns.Add(columnHeader2)
Dim foodList() As String = New String() {"Juice", "Coffee", _
"Cereal & Milk", "Fruit Plate", "Toast & Jelly", _
"Bagel & Cream Cheese"}
Dim foodPrice() As String = New String() {"1.09", "1.09", _
"2.19", "2.49", "1.49", "1.49"}
Dim count As Integer
For count = 0 To foodList.Length - 1
Dim listItem As New ListViewItem(foodList(count))
listItem.SubItems.Add(foodPrice(count))
ListView1.Items.Add(listItem)
Next
Me.Controls.Add(Me.ListView1)
End Sub
// Uses the SelectedIndices property to retrieve and tally the
// price of the selected menu items.
void ListView1_SelectedIndexChanged_UsingIndices( Object^ /*sender*/, System::EventArgs^ /*e*/ )
{
ListView::SelectedIndexCollection^ indexes = this->ListView1->SelectedIndices;
double price = 0.0;
System::Collections::IEnumerator^ myEnum1 = indexes->GetEnumerator();
while ( myEnum1->MoveNext() )
{
int index = safe_cast<int>(myEnum1->Current);
price += Double::Parse( this->ListView1->Items[ index ]->SubItems[ 1 ]->Text );
}
// Output the price to TextBox1.
TextBox1->Text = price.ToString();
}
// Uses the SelectedIndices property to retrieve and tally the
// price of the selected menu items.
private void ListView1_SelectedIndexChanged_UsingIndices(
object sender, System.EventArgs e)
{
ListView.SelectedIndexCollection indexes =
this.ListView1.SelectedIndices;
double price = 0.0;
foreach ( int index in indexes )
{
price += Double.Parse(
this.ListView1.Items[index].SubItems[1].Text);
}
// Output the price to TextBox1.
TextBox1.Text = price.ToString();
}
' Uses the SelectedIndices property to retrieve and tally the price of
' the selected menu items.
Private Sub ListView1_SelectedIndexChanged_UsingIndices _
(ByVal sender As Object, ByVal e As System.EventArgs) _
Handles ListView1.SelectedIndexChanged
Dim indexes As ListView.SelectedIndexCollection = _
Me.ListView1.SelectedIndices
Dim index As Integer
Dim price As Double = 0.0
For Each index In indexes
price += Double.Parse(Me.ListView1.Items(index).SubItems(1).Text)
Next
' Output the price to TextBox1.
TextBox1.Text = CType(price, String)
End Sub
注解
如果在创建句柄之前ListView访问属性，则SelectedIndices属性将不包含任何索引，这通常在最初加载 以在窗体中显示时ListView发生。 可以检查以查看是否使用 IsHandleCreated 属性创建了句柄。 当 属性 MultiSelect 设置为 true时，此属性返回一个集合，其中包含 在 中选择的所有项的 ListView索引。 对于单选， ListView此属性返回包含单个元素的集合，该元素包含 中唯一选定项的 ListView索引。 有关可以使用集合中的项执行的任务的详细信息，请参阅 ListView.SelectedIndexCollection。
如果要获取控件中选择 ListView 的项的集合，而不是所选项的索引位置，请使用 SelectedItems 属性。
