ListView异常：System.ArgumentOutOfRangeException：参数超出范围

Question

I'm trying to create a program to run a specific application, which was selected in a ListView. I have a ListView named SoftView in my application and the code for DoubleClick event is the following:

private void SoftView_DoubleClick(object sender, EventArgs e)

{

 ...
 if (SoftView.Items[SoftView.SelectedIndices[0]].SubItems[0].Text == "Application name")

 {

  ...
   -- Run selected application --
  Application.Exit();

 }

}

On execution I have the following exception:

System.ArgumentOutOfRangeException: Argument is out of range.

Parameter name: index

at System.Windows.Forms.ListView+SelectedIndexCollection.get_Item (Int32 index) [0x00000]

at Launcher.MainForm.SoftView_DoubleClick (System.Object sender, System.EventArgs e) [0x00000]

at System.Windows.Forms.Control.OnDoubleClick (System.EventArgs e) [0x00000]

at System.Windows.Forms.ListView+ItemControl.HandleClicks (System.Windows.Forms.MouseEventArgs me) [0x00000]

at System.Windows.Forms.ListView+ItemControl.ItemsMouseUp (System.Object sender, System.Windows.Forms.MouseEventArgs me) [0x00000]

at System.Windows.Forms.Control.OnMouseUp (System.Windows.Forms.MouseEventArgs e) [0x00000]

at System.Windows.Forms.Control.WmLButtonUp (System.Windows.Forms.Message& m) [0x00000]

at System.Windows.Forms.Control.WndProc (System.Windows.Forms.Message& m) [0x00000]

at System.Windows.Forms.ListView+ItemControl.WndProc (System.Windows.Forms.Message& m) [0x00000]

at System.Windows.Forms.Control+ControlWindowTarget.OnMessage (System.Windows.Forms.Message& m) [0x00000]

at System.Windows.Forms.Control+ControlNativeWindow.WndProc (System.Windows.Forms.Message& m) [0x00000]

at System.Windows.Forms.NativeWindow.WndProc (IntPtr hWnd, Msg msg, IntPtr wParam, IntPtr lParam) [0x00000]

Does anyone know how to solve this problem? Thanks in advance.

Answer 1

There are no selected indexes at the moment when you double click

SoftView.SelectedIndices is empty. So SoftView.SelectedIndices[0] throws the exception.

The fix could be like this:

if (SoftView.Items.Count == 0)
    return;
if (SoftView.SelectedIndices.Count == 0)
    return;
if (SoftView.Items[SoftView.SelectedIndices[0]].SubItems[0].Text == "Application name")
    ...