drag n drop auto event handler for more textboxes

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i used listbox1,10 textBox1,textbox2...............textbox10.
i applied drag n drop from listbox1 to textbox1
it fired ok.

C#

private void listBox1_MouseDown(object sender, MouseEventArgs e)
{
    try
    {
        listBox1.DoDragDrop(listBox1.Items[listBox1.SelectedIndex].ToString(),
                            DragDropEffects.Move);
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message);
    }
}

private void textBox1_DragEnter(object sender, DragEventArgs e)
{
    try
    {
        if (e.Data.GetDataPresent(DataFormats.Text))
        {
            e.Effect = DragDropEffects.Move;
        }
        else
        {
            e.Effect = DragDropEffects.None;
        }
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message);
    }
}

private void txtwpAM1_DragDrop(object sender, DragEventArgs e)
{
    txtwpAM1.Text = System.Convert.ToString(e.Data.GetData(DataFormats.Text).ToString());
}

but i auto select an event handler to textbox2 from textbox1
but its not fired when drag n drop to textbox2 its fired textbox1 only not textbiox2
i have one solution if i write code manually everty textboxes.but it will take more time,
any soulution idea for all textboxes auto event handler using above one code it will fired for all textboxes

Posted 4-Sep-14 21:33pm

cadsolution

Updated 6-Sep-14 5:05am

George Jonsson

v3

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OriginalGriff · Answer 1 · 2014-09-06T05:13:00

Simple: every event handler is passed two parameters - sender and e
The sender parameter if the control (or other class) instance that raise the event.
So if you cast the parameter to a textbox:

C#

private void MyTextBox_DragEnter(object sender, DragEventArgs e)
   {
   TextBox source = sender as TextBox;
   if (source != null)
      {
      try

The source will then be textBox1 for it's event and textBox2 for it's events.
You can then use the same code to handle the drag / drop in all the boxes.

George Jonsson · Answer 2 · 2014-09-06T05:16:00

You can try this approach.
Use generic event handlers and connect to your various controls.

C#

listBox1.MosueDown += listBox_Generic_MouseDown;
listBox2.MosueDown += listBox_Generic_MouseDown;
etc.

textBox1.DragEnter += textBox_Generic_DragEnter;
textBox2.DragEnter += textBox_Generic_DragEnter;
etc

textBox1.DragDrop += textBox_Generic_DragDrop;
textBox2.DragDrop += textBox_Generic_DragDrop;
etc

Then use the sender argument to get the instance of the calling object.

C#

private void listBox_Generic_MouseDown(object sender, MouseEventArgs e)
{
    try
    {
        ListBox listBox = (sender as ListBox);
        if (listBox != null)
            listBox.DoDragDrop(listBox.Items[listBox1.SelectedIndex].ToString(),
                            DragDropEffects.Move);
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message);
    }
}
 
private void textBox_Generic_DragEnter(object sender, DragEventArgs e)
{
    try
    {
        if (e.Data.GetDataPresent(DataFormats.Text))
        {
            e.Effect = DragDropEffects.Move;
        }
        else
        {
            e.Effect = DragDropEffects.None;
        }
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message);
    }
}
 
private void textBox_Generic_DragDrop(object sender, DragEventArgs e)
{
    TextBox textBox = (sender as TextBox);
    if (textBox != null)
        textBox.Text = System.Convert.ToString(e.Data.GetData(DataFormats.Text).ToString());
}

In this fashion you only have one implementation of each event handler.

drag n drop auto event handler for more textboxes

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