WPF登录界面记住密码及代码

WPF登录界面记住密码可以通过设置本地配置文件实现。以下是一份实现代码示例：

在App.xaml.cs中添加以下代码：

public static void SaveSetting(string key, string value)
{
    Properties.Settings.Default[key] = value;
    Properties.Settings.Default.Save();
}

public static string GetSetting(string key)
{
    return Properties.Settings.Default[key].ToString();
}

在登录窗口的构造函数中添加以下代码：

// 读取本地配置文件
if (App.GetSetting("rememberMe") == "true")
{
    this.tbUsername.Text = App.GetSetting("username");
    this.tbPassword.Password = App.GetSetting("password");
    this.chkRememberMe.IsChecked = true;
}
else
{
    this.tbUsername.Text = "";
    this.tbPassword.Password = "";
    this.chkRememberMe.IsChecked = false;
}

在登录事件中添加以下代码：

// 保存本地配置文件
if (this.chkRememberMe.IsChecked == true)
{
    App.SaveSetting("rememberMe", "true");
    App.SaveSetting("username", this.tbUsername.Text);
    App.SaveSetting("password", this.tbPassword.Password);
}
else
{
    App.SaveSetting("rememberMe", "false");
    App.SaveSetting("username", "");
    App.SaveSetting("password", "");
}

在XAML中添加以下代码：

<CheckBox x:Name="chkRememberMe" Content="记住密码" Margin="10" IsChecked="{Binding RememberMe, Mode=TwoWay}" />

<TextBox x:Name="tbUsername" Text="{Binding Username, Mode=TwoWay}" Margin="10" />

<PasswordBox x:Name="tbPassword" Password="{Binding Password, Mode=TwoWay}" Margin="10" />

其中，ViewModel需要实现INotifyPropertyChanged接口，以便在数据绑定时更新UI。代码示例：

public class LoginViewModel : INotifyPropertyChanged
{
    private string _username;
    public string Username
    {
        get { return _username; }
        set
        {
            _username = value;
            OnPropertyChanged("Username");
        }
    }

    private string _password;
    public string Password
    {
        get { return _password; }
        set
        {
            _password = value;
            OnPropertyChanged("Password");
        }
    }

    private bool _rememberMe;
    public bool RememberMe
    {
        get { return _rememberMe; }
        set
        {
            _rememberMe = value;
            OnPropertyChanged("RememberMe");
        }
    }

    public event PropertyChangedEventHandler PropertyChanged;

    protected virtual void OnPropertyChanged(string propertyName)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }
}