ListView.SelectedIndexCollection 类

定义

表示包含 ListView 控件中选定项的索引的集合。

public: ref class ListView::SelectedIndexCollection : System::Collections::IList
public class ListView.SelectedIndexCollection : System.Collections.IList
[System.ComponentModel.ListBindable(false)]
public class ListView.SelectedIndexCollection : System.Collections.IList
type ListView.SelectedIndexCollection = class
    interface IList
    interface ICollection
    interface IEnumerable
[<System.ComponentModel.ListBindable(false)>]
type ListView.SelectedIndexCollection = class
    interface IList
    interface ICollection
    interface IEnumerable
Public Class ListView.SelectedIndexCollection
Implements IList
继承
ListView.SelectedIndexCollection
属性
实现

示例

下面的代码示例演示如何使用 SelectedIndicesSelectedIndexChangedHeaderStyle 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事件处理程序调用 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

ListView.SelectedIndexCollection 索引存储到控件中的 ListView 选定项。 中存储的 ListView.SelectedIndexCollection 索引是 中的 ListView.ListViewItemCollection索引位置。 存储 ListView.ListViewItemCollection 控件中显示的 ListView 所有项。

下表显示了 如何 ListView.ListViewItemCollection 存储 的项 ListView 并在示例 中显示其选择状态的示例 ListView

索引 Item ListView 中的选择状态
0 Item1 未选定
1 Item2 选定
2 Item3 未选定
3 Item4 选定
4 Item5 选定

根据上 ListView.ListViewItemCollection 表中的示例,下表演示了 的显示方式 ListView.SelectedIndexCollection

索引 ListViewItemCollection 中选定项的索引
0 1
1 3
2 4

可以使用此类的属性和方法对集合执行各种任务。 使用 Contains 方法可以确定 中的 ListView.ListViewItemCollection 索引位置是否是 中存储 ListView.SelectedIndexCollection的索引之一。 知道项在集合中后,可以使用 IndexOf 方法确定索引在 中 ListView.SelectedIndexCollection的位置。

构造函数

ListView.SelectedIndexCollection(ListView)

初始化 ListView.SelectedIndexCollection 类的新实例。

属性

Count

获取集合中的项数。

IsReadOnly

获取一个值,该值指示集合是否为只读。

Item[Int32]

获取集合中指定索引处的索引值。

方法

Add(Int32)

Items 数组中指定索引处的项添加到集合。

Clear()

清除集合中的项。

Contains(Int32)

确定指定索引是否位于集合中。

CopyTo(Array, Int32)

将整个集合复制到现有数组中,从该数组内的指定位置开始复制。

Equals(Object)

确定指定对象是否等于当前对象。

(继承自 Object)
GetEnumerator()

返回可用于循环访问选定索引集合的枚举数。

GetHashCode()

作为默认哈希函数。

(继承自 Object)
GetType()

获取当前实例的 Type

(继承自 Object)
IndexOf(Int32)

ListView.SelectedIndexCollection 控件的 ListView.ListViewItemCollection 中返回指定索引的 ListView 内的索引。

MemberwiseClone()

创建当前 Object 的浅表副本。

(继承自 Object)
Remove(Int32)

Items 中移除 ListView.SelectedIndexCollection 集合中指定索引处的项。

ToString()

返回表示当前对象的字符串。

(继承自 Object)

显式接口实现

ICollection.IsSynchronized

获取一个值,该值指示对集合的访问是否为同步的(线程安全)。

ICollection.SyncRoot

获取可用于同步控件集合访问的对象。

IList.Add(Object)

向集合中添加一项。

IList.Clear()

从集合中移除所有项。

IList.Contains(Object)

确定指定项是否位于集合内。

IList.IndexOf(Object)

此 API 支持产品基础结构,不能在代码中直接使用。

返回 ListView.SelectedIndexCollection 中的索引。 ListView.SelectedIndexCollection 包含 ListView.ListViewItemCollection 控件的 ListView 中的选定项的索引。

IList.Insert(Int32, Object)

将某个项插入到集合中的指定索引处。

IList.IsFixedSize

获取一个值,该值指示 ListView.SelectedIndexCollection 是否具有固定大小。

IList.Item[Int32]

获取或设置集合中的对象。

IList.Remove(Object)

从集合中移除指定项的第一个匹配项。

IList.RemoveAt(Int32)

移除集合中指定索引处的项。

扩展方法

Cast<TResult>(IEnumerable)

IEnumerable 的元素强制转换为指定的类型。

OfType<TResult>(IEnumerable)

根据指定类型筛选 IEnumerable 的元素。

AsParallel(IEnumerable)

启用查询的并行化。

AsQueryable(IEnumerable)

IEnumerable 转换为 IQueryable

适用于