验证文本框文本并增加选项卡索引一次

问题描述

我知道我的代码出了问题，但不知道如何解决...

hi i know where my code is going wrong, but don't know how to fix it...

在TextChanged事件上，我调用了验证函数，该函数可以(应该这样做)进行以下操作:

on the TextChanged event, i call my validation function which does (is supposed to do) the following:

• 删除任何非字母字符
• 将输入的字母转换为大写字母
• 在文本框中只允许一个字符
• 使用SendKeys增加标签索引(转到下一个文本框)

问题是因为它处于textchanged事件中，所以我正在努力与它进行战斗，以防止它两次切换(它正在执行).因为如果我逐步执行，则输入的首字母是第一个textchanged事件，然后，如果它是一个不允许的字符，则再次调用该函数，但是如果是字母，则ToUpper可能会再次对其进行更改，因此制表符被发送两次.有任何想法吗?我知道有一种方法可以在不设置一些复杂的布尔值的情况下....

problem is since it is in the textchanged event, i'm trying to fight it to prevent it from tabbing twice (which it is doing). because the if i step through, the initial letter entered is the first textchanged event, then if it is a notallowedcharacter, the function is called again, but if it is a letter, the ToUpper may be changing it again so tab is getting sent twice. any ideas? i know there's a way to do this without setting up some complex bools....

private void validateTextInteger(object sender, EventArgs e)
        {
            TextBox T = (TextBox)sender;
            try
            {
                //Not Allowing Numbers, Underscore or Hash
                char[] UnallowedCharacters = { '0', '1','2', '3', '4', '5','6', '7','8', '9','_','#','%','$','@','!','&',
                                           '(',')','{','}','[',']',':','<','>','?','/','=','-','+','\\','|','`','~',';'};

                if (textContainsUnallowedCharacter(T.Text, UnallowedCharacters))
                {
                    int CursorIndex = T.SelectionStart - 1;
                    T.Text = T.Text.Remove(CursorIndex, 1);
                    //Align Cursor to same index
                    T.SelectionStart = CursorIndex;
                    T.SelectionLength = 0;
                }
            }
            catch (Exception) { }
            T.Text = T.Text.ToUpper();
            if (T.Text.Length > 0)
            {
                 //how do i prevent this (or this function) from getting called twice???
                 SendKeys.Send("{TAB}");
            }
        }

推荐答案

您可以使用选项卡顺序查找下一个可见控件，然后在其上调用Focus，而不是使用SendKeys模拟TAB按键.像这样:

Instead of using SendKeys to simulate a TAB keypress, you can find the next visible control in the tab order and call Focus on it. Something like this:

private void FocusOnNextVisibleControl(Control currentControl)
{
    Form form = currentControl.FindForm();
    Control nextControl = form.GetNextControl(currentControl, true);
    while (nextControl != null && !nextControl.Visible && nextControl != currentControl)
    {
        nextControl = form.GetNextControl(nextControl, true);
    }
    if (nextControl != null && nextControl.Visible)
    {
        nextControl.Focus();
    }
}

要调用此方法，请将SendKeys.Send("{TAB}");替换为FocusOnNextVisibleControl(T);

To call this method, replace SendKeys.Send("{TAB}"); with FocusOnNextVisibleControl(T);

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