ListView.SelectedIndexCollection 类

定义

表示包含 ListView 控件中选定项的索引的集合。Represents the collection that contains the indexes to the selected items in a ListView control.

public: ref 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
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SelectedIndices使用、 SelectedIndexChanged ListView.SelectedIndexCollection 、和HeaderStyle成员以及类。The following code example demonstrates how to use the SelectedIndices, SelectedIndexChanged, and HeaderStyle members and the ListView.SelectedIndexCollection class. 若要运行此示例, 请将以下代码ListView粘贴到包含名为ListView1的对象和名TextBoxTextBox1的的窗体中。To run this example, paste the following code into a form that contains a ListView object named ListView1 and a TextBox named TextBox1. 从窗体的构造函数或Load事件处理程序调用方法。InitializeListViewCall the InitializeListView method from the form's constructor or Load event handler. 此示例要求正确与SelectedIndexChanged事件关联的事件处理程序。This example requires that the event handler is correctly associated with the SelectedIndexChanged event.

// 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ListView控件中的选定项。A ListView.SelectedIndexCollection stores the indexes to the selected items in a ListView control. 存储在中ListView.SelectedIndexCollection的索引是ListView.ListViewItemCollection内的索引位置。The indexes stored in the ListView.SelectedIndexCollection are index positions within the ListView.ListViewItemCollection. ListView.ListViewItemCollection存储显示ListView在控件中的所有项。The ListView.ListViewItemCollection stores all items displayed in the ListView control.

下表显示了如何ListView.ListViewItemCollection存储的项ListView的示例, 以及如何在示例ListView中显示其选择状态。The following table shows an example of how the ListView.ListViewItemCollection stores the items of the ListView and shows their selection states in an example ListView.

IndexIndex Item ListView 中的选择状态Selection state in the ListView
00 Item1Item1 未选定Unselected
11 Item2Item2 已选定Selected
22 Item3Item3 未选定Unselected
33 Tuple.item4Item4 已选定Selected
44 Tuple.item5Item5 已选定Selected

根据上表ListView.ListViewItemCollection中的示例, 下表演示了ListView.SelectedIndexCollection将如何显示。Based on the ListView.ListViewItemCollection example in the previous table, the following table demonstrates how the ListView.SelectedIndexCollection would appear.

IndexIndex ListViewItemCollection 中选定项的索引Index of selected item in the ListViewItemCollection
00 11
11 33
22 44

您可以使用此类的属性和方法来使用集合执行各种任务。You can use the properties and methods of this class to perform a variety of tasks with the collection. 使用Contains方法可以确定ListView.ListViewItemCollection中的索引位置是否为中ListView.SelectedIndexCollection存储的索引之一。The Contains method enables you to determine whether an index position from the ListView.ListViewItemCollection is one of the indexes stored in the ListView.SelectedIndexCollection. 一旦您知道该项位于集合中, 就可以使用IndexOf方法确定索引ListView.SelectedIndexCollection在中的位置。Once you know that the item is in the collection, you can use the IndexOf method to determine the position of the index in the ListView.SelectedIndexCollection.

构造函数

ListView.SelectedIndexCollection(ListView)

初始化 ListView.SelectedIndexCollection 类的新实例。Initializes a new instance of the ListView.SelectedIndexCollection class.

属性

Count

获取集合中的项数。Gets the number of items in the collection.

IsReadOnly

获取一个值,该值指示集合是否为只读。Gets a value indicating whether the collection is read-only.

Item[Int32]

获取集合中指定索引处的索引值。Gets the index value at the specified index within the collection.

方法

Add(Int32)

Items 数组中指定索引处的项添加到集合。Adds the item at the specified index in the Items array to the collection.

Clear()

清除集合中的项。Clears the items in the collection.

Contains(Int32)

确定指定索引是否位于集合中。Determines whether the specified index is located in the collection.

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。Copies the entire collection into an existing array at a specified location within the array.

Equals(Object)

确定指定的对象是否等于当前对象。Determines whether the specified object is equal to the current object.

(继承自 Object)
GetEnumerator()

返回可用于循环访问选定索引集合的枚举数。Returns an enumerator that can be used to iterate through the selected index collection.

GetHashCode()

用作默认哈希函数。Serves as the default hash function.

(继承自 Object)
GetType()

获取当前实例的 TypeGets the Type of the current instance.

(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。Returns the index within the ListView.SelectedIndexCollection of the specified index from the ListView.ListViewItemCollection of the ListView control.

MemberwiseClone()

创建当前 Object 的浅表副本。Creates a shallow copy of the current Object.

(继承自 Object)
Remove(Int32)

Items 中移除 ListView.SelectedIndexCollection 集合中指定索引处的项。Removes the item at the specified index in the Items collection from the ListView.SelectedIndexCollection.

ToString()

返回一个表示当前对象的 string。Returns a string that represents the current object.

(继承自 Object)

显式界面实现

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)。Gets a value indicating whether access to the collection is synchronized (thread safe).

ICollection.SyncRoot

获取可用于同步控件集合访问的对象。Gets an object that can be used to synchronize access to the collection of controls.

IList.Add(Object)

向集合中添加一项。Adds an item to the collection.

IList.Clear()

从集合中移除所有项。Removes all items from the collection.

IList.Contains(Object)

确定指定项是否位于集合内。Determines whether the specified item is located in the collection.

IList.IndexOf(Object)

返回 ListView.SelectedIndexCollection 中的索引。Returns the index in the ListView.SelectedIndexCollection. ListView.SelectedIndexCollection 包含 ListView.ListViewItemCollection 控件的 ListView 中的选定项的索引。The ListView.SelectedIndexCollection contains the indexes of selected items in the ListView.ListViewItemCollection of the ListView control.

IList.Insert(Int32, Object)

将某个项插入到集合中的指定索引处。Inserts an item into the collection at a specified index.

IList.IsFixedSize

获取一个值,该值指示 ListView.SelectedIndexCollection 是否具有固定大小。Gets a value indicating whether the ListView.SelectedIndexCollection has a fixed size.

IList.Item[Int32]

获取或设置集合中的对象。Gets or sets an object in the collection.

IList.Remove(Object)

从集合中移除指定项的第一个匹配项。Removes the first occurrence of a specified item from the collection.

IList.RemoveAt(Int32)

移除集合中指定索引处的项。Removes an item from the collection at a specified index.

扩展方法

Cast<TResult>(IEnumerable)

IEnumerable 的元素强制转换为指定的类型。Casts the elements of an IEnumerable to the specified type.

OfType<TResult>(IEnumerable)

根据指定类型筛选 IEnumerable 的元素。Filters the elements of an IEnumerable based on a specified type.

AsParallel(IEnumerable)

启用查询的并行化。Enables parallelization of a query.

AsQueryable(IEnumerable)

IEnumerable 转换为 IQueryableConverts an IEnumerable to an IQueryable.

适用于