Stop comboBox's selectedIndexChanged event fro

问题:

I have a form with a ComboBox that provides a dropdownlist. On the comboBox's SelectedIndexChanged event, am running some code, but I don't want that code to run when the form loads. Unfortunately, when I load the form (before I make a selection in the combobox), SelectedIndexChanged of the combobox fires (I think when the combobox is databinding). Is there a way of avoiding such behaviour?

回答1:

If you want to react only when the user change the selected item in the combo box, then it is better to subscribe to SelectionChangeCommitted.

回答2:

You can simply unbind the SelectedIndexChanged event, call your fill function and bind the SelectedIndexChanged event again. Unfortunately, this doesn't work with a grid.

For example:

this.cmb.SelectionChanged -= new System.EventHandler(this.cmb_SelectionChanged);
cmb.fill(); //Your function
this.cmb.SelectionChanged += new System.EventHandler(this.cmb_SelectionChanged);

回答3:

Why not have a boolean flag that indicates when your Form has finished loading?

In your SelectionChanged event, check if the boolean flag is true. If it is true then handle the event, otherwise ignore it.

回答4:

Be sure to set the DataSource property in your onload() function after assigning the ValueMember and Datamember properties.

This will help you to solve your problem!

回答5:

VB

RemoveHandler lbxNomes.SelectedIndexChanged, AddressOf lbxNomes_SelectedIndexChanged
lbxNomes.DataSource = dst
Label1.Text = String.Format("Encontrados {0} Sócios nesta pesquisa", dst.Rows.Count)
Label1.Visible = True
AddHandler lbxNomes.SelectedIndexChanged, AddressOf lbxNomes_SelectedIndexChanged

回答6:

It worked for me in a way with the following code:

  private void ddlChapter_SelectionChangeCommitted(object sender, EventArgs e)
    {
        if (ddlChapter.SelectedValue != null)
        {
           // Do something here
        }
    }