C＃VSTO Winform Control访问来自动态创建的Form的控件

Question

I have an Excel Addin that call a Windows Form that has a List Box. Before I show the form, I want to populate the ListBox dynamically based on values from Excel .

Winform Looks like below:

Button click within Ribbon looks like below:

private void button1_Click(object sender, RibbonControlEventArgs e)
{
    Form1 fm = new Form1();
    System.Windows.Forms.ListBox lbx = fm.Controls.Find("listBox1", true).FirstOrDefault() as System.Windows.Forms.ListBox;
    lbx.Items.AddRange(new object[] { 1, 2, 3, 4, 5 });
    fm.Show();
}

Is

System.Windows.Forms.ListBox lbx = fm.Controls.Find("listBox1", true).FirstOrDefault() as System.Windows.Forms.ListBox;

the best way of accessing the ListBox and adding Item s to it?
Or is there any other way?

Answer 1

In your scenario, since you create a new Form1 instance each time you wish to show it, and since it is a custom form, I would simply modify the form's constructor to accept the input data.

public Form1(object[] ListBoxData)
{
   ...
   listBox1.Items.AddRange(ListBoxData);
}

You can then simply just pass in the values when you click the button;

Form1 fm = new Form1(new object[] { 1, 2, 3, 4, 5 });
fm.Show();

Answer 2

Per Chetan's suggestion: Property :

 public object[] ListBoxData
        {
            set
            {
                listBox1.Items.AddRange(value);
            }
        }

Change in Button Click:

 Form1 fm = new Form1();
            fm.ListBoxData = new object[] { 1, 2, 3, 4, 5 };
            fm.Show();