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TreeView::NodeMouseDoubleClick Event

Occurs when the user double-clicks a TreeNode with the mouse.

Namespace:  System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)

public:
 event TreeNodeMouseClickEventHandler^ NodeMouseDoubleClick {
	void add (TreeNodeMouseClickEventHandler^ value);
	void remove (TreeNodeMouseClickEventHandler^ value);
}

This event occurs when the user double-clicks any part of a tree node with the mouse, including the plus sign (+) or minus sign (-) that indicates whether the node is collapsed or expanded.

For more information about handling events, see Handling and Raising Events.

The following code example demonstrates how to handle the NodeMouseDoubleClick event and how to use the TreeNodeMouseClickEventArgs. To run this example, paste the code into a Windows Form that contains a TreeView named treeView1. Populate treeView1 with the names of files located in the c:\ directory of the system the sample is running on, and associate the NodeMouseDoubleClick event of treeView1 with the treeView1_NodeMouseDoubleClick method in this example. This example requires that the user has administrator privileges on the machine running the example.

    // If a node is double-clicked, open the file indicated by the TreeNode. 
private:
    void InitialTreeView_NodeMouseDoubleClick(Object^ sender,
        TreeNodeMouseClickEventArgs^ e)
    {
        try
        {
            // Look for a file extension. 
            if (e->Node->Text->Contains("."))
            {
                System::Diagnostics::Process::Start("c:\\" + e->Node->Text);
            }
        }
        // If the file is not found, handle the exception and inform the user. 
        catch (System::ComponentModel::Win32Exception^)
        {
            MessageBox::Show("File not found.");
        }
    }

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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