PasswordBox 助手 - C#

使用PasswordBox（密码框）是保护用户密码的一种有效方式。但是，开发人员又常常需要在代码中获取PasswordBox的值。为了在代码中使用PasswordBox，我们需要一个PasswordBox助手。

功能

• 获取PasswordBox的值
• 将PasswordBox字符串转换为SecureString
• 将SecureString转换为字符串

用法

获取PasswordBox的值

string password = passwordBox.Password;

将PasswordBox字符串转换为SecureString

SecureString securePassword = PasswordBoxHelper.ConvertToSecureString(passwordBox.Password);

将SecureString转换为字符串

string password = PasswordBoxHelper.ConvertToUnsecureString(securePassword);

示例代码

using System.Security;

public static class PasswordBoxHelper
{
    /// <summary>
    /// 将PasswordBox中的字符串转换为SecureString
    /// </summary>
    public static SecureString ConvertToSecureString(string password)
    {
        if (password == null)
        {
            throw new ArgumentNullException(nameof(password));
        }

        var securePassword = new SecureString();

        foreach (var c in password)
        {
            securePassword.AppendChar(c);
        }

        securePassword.MakeReadOnly();
        return securePassword;
    }

    /// <summary>
    /// 将SecureString转换为字符串
    /// </summary>
    public static string ConvertToUnsecureString(SecureString securePassword)
    {
        if (securePassword == null)
        {
            throw new ArgumentNullException(nameof(securePassword));
        }

        IntPtr passwordBSTR = IntPtr.Zero;

        try
        {
            passwordBSTR = Marshal.SecureStringToBSTR(securePassword);
            return Marshal.PtrToStringBSTR(passwordBSTR);
        }
        finally
        {
            Marshal.ZeroFreeBSTR(passwordBSTR);
        }
    }
}