ItemCheckEventArgs Class
Provides data for the ItemCheck event of the CheckedListBox and ListView controls.
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
The ItemCheckEventArgs type exposes the following members.
| Name | Description | |
|---|---|---|
![]() | CurrentValue | Gets a value indicating the current state of the item's check box. |
![]() | Index | Gets the zero-based index of the item to change. |
![]() | NewValue | Gets or sets a value indicating whether to set the check box for the item to be checked, unchecked, or indeterminate. |
| Name | Description | |
|---|---|---|
![]() | Equals(Object) | Determines whether the specified Object is equal to the current Object. (Inherited from Object.) |
![]() | Finalize | Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.) |
![]() | GetHashCode | Serves as a hash function for a particular type. (Inherited from Object.) |
![]() | GetType | Gets the Type of the current instance. (Inherited from Object.) |
![]() | MemberwiseClone | Creates a shallow copy of the current Object. (Inherited from Object.) |
![]() | ToString | Returns a string that represents the current object. (Inherited from Object.) |
The ItemCheck event occurs when the checked state of an item in a checked list box changes. The ItemCheckEventArgs class specifies the index of the item to change, the current value of the check box for the item, and the new value to set for the check box.
For more information about handling events, see Consuming Events.
The following code example demonstrates a checked ListView control that handles the ListView::ItemCheck event. The method uses the CurrentValue and Index properties of the ItemCheckEventArgs object to retrieve and tally the price of the menu items selected. To run this example paste the following code in a form containing a ListView named ListView1 and a TextBox named Textbox1. Call the InititalizeListView method from the form's constructor or Load method. Ensure all events are associated with their event-handling methods.
void InitializeListView() { this->ListView1 = gcnew System::Windows::Forms::ListView; // Set properties such as BackColor and DockStyle and Location. 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->Size = System::Drawing::Size( 292, 130 ); this->ListView1->View = System::Windows::Forms::View::Details; this->ListView1->HideSelection = false; // Allow the user to select multiple items. this->ListView1->MultiSelect = true; // Show CheckBoxes in the ListView. this->ListView1->CheckBoxes = true; //Set the column headers and populate the columns. ListView1->HeaderStyle = ColumnHeaderStyle::Nonclickable; ColumnHeader^ columnHeader1 = gcnew ColumnHeader; columnHeader1->Text = "Breakfast Choices"; 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","2.79","2.09","2.69"}; int count; // Members are added one at a time, so call BeginUpdate to ensure // the list is painted only once, rather than as each list item is added. ListView1->BeginUpdate(); for ( count = 0; count < foodList->Length; count++ ) { ListViewItem^ listItem = gcnew ListViewItem( foodList[ count ] ); listItem->SubItems->Add( foodPrice[ count ] ); ListView1->Items->Add( listItem ); } //Call EndUpdate when you finish adding items to the ListView. ListView1->EndUpdate(); this->Controls->Add( this->ListView1 ); } ... double price; // Handles the ItemCheck event. The method uses the CurrentValue // property of the ItemCheckEventArgs to retrieve and tally the // price of the menu items selected. void ListView1_ItemCheck1( Object^ /*sender*/, System::Windows::Forms::ItemCheckEventArgs^ e ) { if ( e->CurrentValue == CheckState::Unchecked ) { price += Double::Parse( this->ListView1->Items[ e->Index ]->SubItems[ 1 ]->Text ); } else if ( (e->CurrentValue == CheckState::Checked) ) { price -= Double::Parse( this->ListView1->Items[ e->Index ]->SubItems[ 1 ]->Text ); } // Output the price to TextBox1. TextBox1->Text = price.ToString(); }
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
