How to force re-display of UpDown Boxes?

Question

How can I force re-display the value of the Updown window?

I have an application in which there are several UpDown blocks for setting the values ​​of the configuration file before downloading the file to the embedded device. I can download the configuration from the device and display the values ​​in the corresponding UpDown windows.

However, if I delete the contents of the UpDown window and then update it, the value of the updown field will not be redrawn unless I increase or decrease the value using the built-in buttons.

Playback Actions:

• Launch the application.
• Remove value from UpDown window so that it does not display anything
• Change the value of UpDownBox.Value until the value is displayed.
• Incrementing or decreasing the UpDown window by using the buttons displays the correctly changed value.

I tried the following without changes .:

            fenceNumberUpDown.Value = config.getFenceNumber();
            fenceNumberUpDown.Refresh();
            fenceNumberUpDown.Update();
            fenceNumberUpDown.ResetText();
            fenceNumberUpDown.Select();
            fenceNumberUpDown.Hide();
            fenceNumberUpDown.Show();
            fenceNumberUpDown.Invalidate();

Answer 1

Here are some workarounds that I could come up with or give you some other ideas for solving the problem.

Workaround # 1: Call UpButton () before setting the value.

this.numericUpDown1.UpButton();
this.numericUpDown1.Value = 20;

Workaround # 2: Extending NumericUpDown and overriding a property.

public class NumericUpDownNew : NumericUpDown
{
    public new decimal Value
    {
        get { return base.Value; }
        set 
        {
            string text = "";
            if(this.ThousandsSeparator)
                text = ((decimal)value).ToString("n" + this.DecimalPlaces);
            else
                text = ((decimal)value).ToString("g" + this.DecimalPlaces);

            Controls[1].Text = text;
            base.Value = value;
        }
    }
}

Answer 2

I just ran into the same problem, and I found another workaround that some users might prefer:

numUpDown.Text = " ";
numUpDown.Value = 12.34m;

Text ( , IntelliSense , ), ( ) . Value , , .