Control.DoubleClick Event
Assembly: System.Windows.Forms (in system.windows.forms.dll)
public: event EventHandler^ DoubleClick { void add (EventHandler^ value); void remove (EventHandler^ value); }
/** @event */ public void add_DoubleClick (EventHandler value) /** @event */ public void remove_DoubleClick (EventHandler value)
In JScript, you can handle the events defined by a class, but you cannot define your own.
Not applicable.
A double-click is determined by the mouse settings of the user's operating system. The user can set the time between clicks of a mouse button that should be considered a double-click rather than two clicks. The Click event is raised every time a control is double-clicked. For example, if you have event handlers for the Click and DoubleClick events of a Form, the Click and DoubleClick events are raised when the form is double-clicked and both methods are called. If a control is double-clicked and that control does not support the DoubleClick event, the Click event might be raised twice.
You must set the StandardDoubleClick and StandardClick values of ControlStyles to true for this event to be raised. These values might already be set to true if you are inheriting from existing Windows Forms controls.
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| The following events are not raised for the TabControl class unless there is at least one TabPage in the TabControl.TabPages collection: Click, DoubleClick, MouseDown, MouseUp, MouseHover, MouseEnter, MouseLeave and MouseMove. If there is at least one TabPage in the collection, and the user interacts with the tab control's header (where the TabPage names appear), the TabControl raises the appropriate event. However, if the user interaction is within the client area of the tab page, the TabPage raises the appropriate event. |
For more information about handling events, see Consuming Events.
Notes to Inheritors: Inheriting from a standard Windows Forms control and changing the StandardClick or StandardDoubleClick values of ControlStyles to true can cause unexpected behavior or have no effect at all if the control does not support the Click or DoubleClick events. The following table lists Windows Forms controls and which event (Click or DoubleClick) is raised in response to the mouse action specified.| Control | Left Mouse Click | Left Mouse Double Click | Right Mouse Click | Right Mouse Double Click | Middle Mouse Click | Middle Mouse Double Click | XButton1 Mouse Click | XButton1 Mouse Double-Click | XButton2 Mouse Click | XButton2 Mouse Double-Click |
|---|---|---|---|---|---|---|---|---|---|---|
| none | none | none | none | none | none | none | none | none | none | |
| Click | Click, Click | none | none | none | none | none | none | none | none | |
| Click | Click, DoubleClick | none | none | none | none | none | none | none | none | |
| Click | Click, DoubleClick | none | none | none | none | none | none | none | none | |
| * TreeView, * ListView | Click | Click, DoubleClick | Click | Click, DoubleClick | none | none | none | none | none | none |
| Click | Click, Click | Click | Click, Click | Click | Click, Click | Click | Click, Click | Click | Click, Click | |
| Form, TabPage, ** TabControl | Click | Click, DoubleClick | Click | Click, DoubleClick | Click | Click, DoubleClick | Click | Click, DoubleClick | Click | Click, DoubleClick |
The following code example uses the DoubleClick event of a ListBox to load text files listed in the ListBox into a TextBox control.
// This example uses the DoubleClick event of a ListBox to load text files // listed in the ListBox into a TextBox control. This example // assumes that the ListBox, named listBox1, contains a list of valid file // names with path and that this event handler method // is connected to the DoublClick event of a ListBox control named listBox1. // This example requires code access permission to access files. private: void listBox1_DoubleClick( Object^ /*sender*/, System::EventArgs^ /*e*/ ) { // Get the name of the file to open from the ListBox. String^ file = listBox1->SelectedItem->ToString(); try { // Determine if the file exists before loading. if ( System::IO::File::Exists( file ) ) { // Open the file and use a TextReader to read the contents into the TextBox. System::IO::FileInfo^ myFile = gcnew System::IO::FileInfo( listBox1->SelectedItem->ToString() ); System::IO::TextReader^ myData = myFile->OpenText(); ; textBox1->Text = myData->ReadToEnd(); myData->Close(); } } // Exception is thrown by the OpenText method of the FileInfo class. catch ( System::IO::FileNotFoundException^ ) { MessageBox::Show( "The file you specified does not exist." ); } // Exception is thrown by the ReadToEnd method of the TextReader class. catch ( System::IO::IOException^ ) { MessageBox::Show( "There was a problem loading the file into the TextBox. Ensure that the file is a valid text file." ); } }
// This example uses the DoubleClick event of a ListBox to load text files
// listed in the ListBox into a TextBox control. This example
// assumes that the ListBox, named listBox1, contains a list of valid file
// names with path and that this event handler method
// is connected to the DoublClick event of a ListBox control named listBox1.
// This example requires code access permission to access files.
private void listBox1_DoubleClick(Object sender, System.EventArgs e)
{
// Get the name of the file to open from the ListBox.
String file = listBox1.get_SelectedItem().ToString();
try {
// Determine if the file exists before loading.
if (System.IO.File.Exists(file)) {
// Open the file and use a TextReader to read the contents
// into the TextBox.
System.IO.FileInfo myFile = new System.IO.FileInfo(listBox1.
get_SelectedItem().ToString());
System.IO.TextReader myData = myFile.OpenText();
textBox1.set_Text(myData.ReadToEnd());
myData.Close();
}
}
// Exception is thrown by the OpenText method of the FileInfo class.
catch (System.IO.FileNotFoundException exp) {
MessageBox.Show("The file you specified does not exist.");
}
// Exception is thrown by the ReadToEnd method of the TextReader class.
catch (System.IO.IOException exp) {
MessageBox.Show("There was a problem loading the file into the "
+ "TextBox. Ensure that the file is a valid text file.");
}
} //listBox1_DoubleClick
Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.
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