Question

我有一个密码框，我想获取输入数据以检查验证。

我的密码箱c＃代码

  public void textBox2_TextInput(object sender, TextCompositionEventArgs e)
    {
        //pass = textBox2.ToString();
    }

和xaml代码

<PasswordBox Name="textBox2" 
             PasswordChar="*"  
             TextInput="textBox2_TextInput" />

这是我为捕获密码所写的内容

  private void loginbutton_Click(object sender, RoutedEventArgs e)
   {
       usr = textBox1.Text;
       SecureString passdat =textBox2.SecurePassword;
       pass = passdat.ToString();
   }

它返回null。这是一个虚拟演示，因此不需要加密。我之前使用的是文本框，验证工作正常。使用密码框只是复杂的事情。

Answer 1

SecureString class不允许您查看该值;这就是它的重点。如果您希望能够使用输入到PasswordBox中的值，请使用PasswordBox的密码成员而不是SecurePassword成员：

private void loginbutton_Click(object sender, RoutedEventArgs e)
{
    usr = textBox1.Text;
    String pass = textBox2.Password;
}

Answer 2

请注意，SecureString没有检查，比较或转换SecureString值的成员。缺少此类成员有助于保护实例的价值免受意外或恶意暴露。使用System.Runtime.InteropServices.Marshal类的适当成员（例如SecureStringToBSTR方法）来操作SecureString对象的值。

        private void loginbutton_Click(object sender, RoutedEventArgs e)
        {
            usr = textBox1.Text;
            txtPassword=textBox2.Text;

            SecureString objSecureString=new SecureString();
            char[] passwordChar = txtPassword.ToCharArray();
            foreach (char c in passwordChar)
                    objSecureString.AppendChar(c);
            objSecureString.MakeReadOnly();//Notice at the end that the MakeReadOnly command prevents the SecureString to be edited any further.


            //Reading a SecureString is more complicated. There is no simple ToString method, which is also intended to keep the data secure. To read the data C# developers must access the data in memory directly. Luckily the .NET Framework makes it fairly simple:
            IntPtr stringPointer = Marshal.SecureStringToBSTR(objSecureString);
            string normalString = Marshal.PtrToStringBSTR(stringPointer);//Original Password text

        }

使用passwordbox的值作为变量

2 个答案: