[英]How to set MaxLength in PasswordBox when input is Button.Content instead of keyboard? (WPF)
I have a simple keypad with 0-9, a Clear button, and an Enter Button. 我有一个带有0-9的简单键盘,一个清除按钮和一个输入按钮。 Clicking the numbers places the content into a PasswordBox.
单击数字将内容放入PasswordBox。 Clicking the Clear button simulates a backspace, and the Enter Button acts as a submit for predefined 4 digit codes.
单击“清除”按钮将模拟退格,并且“输入”按钮充当预定义4位数字代码的提交。 If the correct code is entered, it appends to a textbox showing that access was granted, else, access denied.
如果输入正确的代码,它将附加到一个文本框,显示已授予访问权限,否则,访问被拒绝。
I am having no problems except when trying to set a MaxLength on the PasswordBox. 除了尝试在PasswordBox上设置MaxLength之外,我没有任何问题。 I have tried it in my XAML with:
我已经在XAML中使用以下方法进行了尝试:
<PasswordBox PasswordChanged="securityCodeTextBox_PasswordChanged" MaxLength="4" KeyDown="securityCodeTextBox_KeyDown" x:Name="securityCodeTextBox" PasswordChar="•" HorizontalAlignment="Left" Margin="117,20,0,0" VerticalAlignment="Top" Height="23" Width="213"/>
I've also tried it programmatically with: 我还通过以下方式通过程序进行了尝试:
securityCodeTextBox.MaxLength = 4;
This is the only code in my function for the numeric buttons: 这是我的函数中数字按钮的唯一代码:
private void ButtonClickNum(object sender, RoutedEventArgs e)
{
Button button = (Button)sender;
securityCodeTextBox.Password += button.Content.ToString();
}
I don't have to implement this, since if the code is wrong, it will just log "Access Denied" in the textbox below it. 我不必执行此操作,因为如果代码错误,它将仅在其下面的文本框中记录“访问被拒绝”。 However, I am really curious on how to do this after realizing the MaxLength is for keyboard input , not button clicks.
但是,我对实现MaxLength是用于键盘输入而不是按钮单击之后的操作感到非常好奇。 I currently have the keyboard completely disabled with:
我目前使用以下命令完全禁用了键盘:
//Prevent keyboard input
private void securityCodeTextBox_KeyDown(object sender, KeyEventArgs e)
{
e.Handled = true;
}
Next attempt 下次尝试
I created a very sloppy way to disable all but the Clear and Enter buttons if the length reaches >=4 with these code snippets in the Num and Clear Button Click functions: 我创建了一个非常草率的方法,如果长度达到> = 4,则禁用除“清除”和“输入”按钮之外的所有按钮,并在Num和“清除按钮的单击”功能中使用以下代码段:
private void ButtonClickNum(object sender, RoutedEventArgs e)
{
Button button = (Button)sender;
securityCodeTextBox.Password += button.Content.ToString();
//Disable all buttons if MaxLength is reached
if(securityCodeTextBox.Password.Length >= 4)
{
button0.IsEnabled = false;
button1.IsEnabled = false;
button2.IsEnabled = false;
button3.IsEnabled = false;
button4.IsEnabled = false;
button5.IsEnabled = false;
button6.IsEnabled = false;
button7.IsEnabled = false;
button8.IsEnabled = false;
button9.IsEnabled = false;
}
}
Clear Button 清除按钮
/**
* Remove(int startIndex, int count) startIndex = position, count = num of chars to delete
*/
private void ButtonClickClear(object sender, RoutedEventArgs e)
{
if (securityCodeTextBox.Password.Length > 0)
{
securityCodeTextBox.Password = securityCodeTextBox.Password.Remove(securityCodeTextBox.Password.Length - 1, 1);
}
//Enable all the buttons again once password is less than MaxLength
if (securityCodeTextBox.Password.Length < 4)
{
button0.IsEnabled = true;
button1.IsEnabled = true;
button2.IsEnabled = true;
button3.IsEnabled = true;
button4.IsEnabled = true;
button5.IsEnabled = true;
button6.IsEnabled = true;
button7.IsEnabled = true;
button8.IsEnabled = true;
button9.IsEnabled = true;
}
}
Is there a cleaner way to implement the MaxLength method when the input is the content of a button? 当输入是按钮的内容时,是否存在一种更干净的方法来实现MaxLength方法?
I never worked with WPF or password input Controls before, but I would try it like this, it just wont add up the password if the length is reached. 我以前从未使用过WPF或密码输入控件,但我会这样尝试,如果达到长度,它将不会添加密码。
private void ButtonClickNum(object sender, RoutedEventArgs e)
{
Button button = (Button)sender;
if(securityCodeTextBox.Password.Length < 4)
securityCodeTextBox.Password += button.Content.ToString();
}
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.