文本框的textChanged事件的正则表达式

Question

In my project, There are many TextBoxes inside TabControl to which I am giving same event something like this: ( working )

In my form constructor:

    SetProperty(this);

---

private void SetProperty(Control ctr)
{
    foreach (Control control in ctr.Controls)
    {
        if (control is TextBox)  
        {
            control.TextChanged += new EventHandler(ValidateText);
        }
        else
        {
           if (control.HasChildren) 
           {
               SetProperty(control);  //Recursive function if the control is nested
           }
        }
    }
}

Now I am trying to give TextChanged event to all the TextBoxes. something like this:

    private void ValidateText(object sender,EventArgs e)
    {
        String strpattern = @"^[a-zA-Z][a-zA-Z0-9\'\' ']{1,20}$"; //Pattern is Ok
        Regex regex = new Regex(strpattern);  
        //What should I write here?             
    }

I dont know what to write in the above method because there is not one textbox to consider. Please suggest.

EDIT: The pattern I mentioned shouldn't be allowed into the TextBoxes ie the Text should be converted in to matching string automatically. (should disallow the characters I mentioned in the pattern).

Answer 1

You should first grab the reference of the calling TextBox and then you can match the regular expression for validation to take any decision you want.

private void ValidateText(object sender, EventArgs e)
{
    TextBox txtBox = sender as TextBox;
    String strpattern = @"^[a-zA-Z][a-zA-Z0-9\'\' ']{1,20}$"; //Pattern is Ok
    Regex regex = new Regex(strpattern);
    if (!regex.Match(txtBox.Text).Success)
    {
        // passed
    }
}

ADDED , Better is to hook Validating event, you can call this event anytime you wish to perform Validation for all the TextBoxes at once.

private void SetProperty(Control ctr)
{
    foreach (Control control in ctr.Controls)
    {
        if (control is TextBox)
        {
            control.Validating += ValidateText;
        }
        else
        {
            if (control.HasChildren)
            {
                SetProperty(control);  //Recursive function if the control is nested
            }
        }
    }
}

private void ValidateText(object sender, CancelEventArgs e)
{
    TextBox txtBox = sender as TextBox;
    String strpattern = @"^[a-zA-Z][a-zA-Z0-9\'\' ']{1,20}$"; //Pattern is Ok
    Regex regex = new Regex(strpattern);
    //What should I write here?
    if (!regex.Match(txtBox.Text).Success)
    {
        e.Cancel = true;
    }
    e.Cancel = false;
}

To perform the validation, call this method:

bool isValid = !this.ValidateChildren(ValidationConstraints.Enabled);

References:

1. Extend the Textbox Control to Validate Against Regular Expressions
2. Validation in Windows Forms

Answer 2

您还可以将文本框控件this.textbox1发送到事件处理程序方法，并在事件处理程序中使用正则表达式检查该控件的输入文本。