ListView.SelectedListViewItemCollection 类

定义

表示在列表视图控件中选定项的集合。Represents the collection of selected items in a list view control.

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

示例

下面的代码示例演示如何使用 SelectedItemsSelectedIndexChanged 事件和 HeaderStyle 成员以及 ListView.SelectedListViewItemCollection 类。The following code example demonstrates using the SelectedItems, SelectedIndexChanged event, and HeaderStyle members and the ListView.SelectedListViewItemCollection class. 若要运行此示例,请将以下代码粘贴到一个窗体中,其中包含一个名为 ListView1ListView 对象和一个名为 TextBox1TextBoxTo run this example, paste the following code in 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 InitializeListView 方法。Call the InitializeListView method from the form's constructor or the Load event handler. 此示例要求事件处理程序与 SelectedIndexChanged 事件正确关联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 SelectedItems property to retrieve and tally the price 
// of the selected menu items.
void ListView1_SelectedIndexChanged_UsingItems( Object^ /*sender*/, System::EventArgs^ /*e*/ )
{
   ListView::SelectedListViewItemCollection^ breakfast = this->ListView1->SelectedItems;
   double price = 0.0;
   System::Collections::IEnumerator^ myEnum = breakfast->GetEnumerator();
   while ( myEnum->MoveNext() )
   {
      ListViewItem^ item = safe_cast<ListViewItem^>(myEnum->Current);
      price += Double::Parse( item->SubItems[ 1 ]->Text );
   }

   // Output the price to TextBox1.
   TextBox1->Text = price.ToString();
}
// Uses the SelectedItems property to retrieve and tally the price 
// of the selected menu items.
private void ListView1_SelectedIndexChanged_UsingItems(
    object sender, System.EventArgs e)
{

    ListView.SelectedListViewItemCollection breakfast = 
        this.ListView1.SelectedItems;
    
    double price = 0.0;
    foreach ( ListViewItem item in breakfast )
    {
        price += Double.Parse(item.SubItems[1].Text);
    }

    // Output the price to TextBox1.
    TextBox1.Text = price.ToString();
}
' Uses the SelectedItems property to retrieve and tally the price 
' of the selected menu items.
Private Sub ListView1_SelectedIndexChanged_UsingItems _
    (ByVal sender As Object, ByVal e As System.EventArgs) _
    Handles ListView1.SelectedIndexChanged

    Dim breakfast As ListView.SelectedListViewItemCollection = _
        Me.ListView1.SelectedItems
    Dim item As ListViewItem
    Dim price As Double = 0.0
    For Each item In breakfast
        price += Double.Parse(item.SubItems(1).Text)
    Next

    ' Output the price to TextBox1.
    TextBox1.Text = CType(price, String)
End Sub

注解

ListView.SelectedListViewItemCollectionListView 控件中存储选定项。A ListView.SelectedListViewItemCollection stores the selected items in a ListView control. 存储在 ListView.SelectedListViewItemCollection 中的项是包含在 ListView.ListViewItemCollection中的项。The items stored in the ListView.SelectedListViewItemCollection are items contained in the ListView.ListViewItemCollection. ListView.ListViewItemCollection 存储 ListView中显示的所有项目。The ListView.ListViewItemCollection stores all items displayed in the ListView.

下表显示了一个示例,说明了 ListView.ListViewItemCollection 如何在示例 ListView 控件中存储 ListView 的项以及这些项的选择状态。The following table shows an example of how the ListView.ListViewItemCollection stores the items of the ListView as well as their selection states in an example ListView control.

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

根据上表中的 ListView.ListViewItemCollection 示例,下表演示了 ListView.SelectedListViewItemCollection 的显示方式。Based on the ListView.ListViewItemCollection example in the previous table, the following table demonstrates how the ListView.SelectedListViewItemCollection would appear.

IndexIndex ListViewItemCollection 中的选定项Selected item in the ListViewItemCollection
00 Item2Item2
11 Tuple.item4Item4
22 Tuple.item5Item5

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. 利用 Contains 方法,您可以确定 ListView.ListViewItemCollection 类中的项是否为 ListView.SelectedListViewItemCollection的成员。The Contains method enables you to determine whether an item from the ListView.ListViewItemCollection class is a member of the ListView.SelectedListViewItemCollection. 一旦您知道该项位于集合中,就可以使用 IndexOf 方法来确定项在 ListView.SelectedListViewItemCollection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 item in the ListView.SelectedListViewItemCollection.

构造函数

ListView.SelectedListViewItemCollection(ListView)

初始化 ListView.SelectedListViewItemCollection 类的新实例。Initializes a new instance of the ListView.SelectedListViewItemCollection 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,该值指示集合是否是只读的。Gets a value indicating whether the collection is read-only.

Item[Int32]

获取集合中指定索引处的项。Gets the item at the specified index within the collection.

Item[String]

获取集合中具有指定键的项。Gets an item with the specified key from the collection.

方法

Clear()

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

Contains(ListViewItem)

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

ContainsKey(String)

确定集合中是否包含具有指定键的项。Determines whether an item with the specified key is contained 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项集合的枚举数。Returns an enumerator that can be used to iterate through the selected item 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(ListViewItem)

返回指定的项在集合中的索引。Returns the index within the collection of the specified item.

IndexOfKey(String)

返回具有指定键的项的第一个匹配项的索引。Returns the index of the first occurrence of the item with the specified key.

MemberwiseClone()

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

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

ICollection.SyncRoot

获取可用于同步对控件集合的访问的对象。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.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)

返回指定的项在集合中的索引。Returns the index, within the collection, of the specified item.

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,该值指示集合是否具有固定大小。Gets a value indicating whether the collection has a fixed size.

IList.Item[Int32]

从集合中获取或设置对象。Gets or sets an object from 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