VB 掩码文本框丢失数字

Question

I have a masked textbox in VB.NET to input a time value. I've tried the masks 90:00, 00:00, and ##:##. The first time a value is entered in the box, it inputs fine. I later clear the text with

mskTime.Text = ""

I've also tried

mskTime.Clear()
mskTime.ResetText()

The issue is after the text is cleared and a new time is entered, the first character typed is deleted. More precisely, when I add the time 12:34, I type the 1, it appears in the first character slot. I then press 2, and the 1 disappears and the 2 appears in the second character slot. The character does not disappear when you go to type it again to fix it.

Has anyone seen this issue or know why the first character disappears?

Answer 1

Problem found:

I had a KeyDown function to handle the user pressing enter in the time field:

    If e.KeyCode = Keys.Enter Then
        Schedule()
        e.SuppressKeyPress = True
    End If

Commenting out

e.SuppressKeyPress = True 

solves the issue. I originally used that to prevent Windows from making a ding sound each time enter was pressed.

Answer 2

I had the exact same problem in C#. The input worked fine until the MaskedTextBox was cleared programmatically. After that the first character entered in one of the MaskedTextBoxes was deleted after a second character has been entered. Turned out that the problem lied within the KeyDown event. I was waiting for the Enter -Key there, did some stuff and cleared the TextBoxes . After that, the problem occured.

I solved it now by replacing the KeyDown -Event with a KeyPress -Event.

Answer 3

Here is what I ended up using to catch the Enter Key and move to the next field and not screw up the masked textbox when I come back to it. Douglas

    private void TxtLocID_KeyPress(object sender, KeyPressEventArgs e)
    {
        if (e.KeyChar == (char)Keys.Enter)
        {
            e.Handled = true;
            SendKeys.Send("{Tab}");
        }
    }