可能重复：
设置WPF UI权限的代码背后
我开始用WPF工作，并希望创建一个应用程序，将显示根据用户（AD）/隐藏控件和他的角色（S）（自定义）。
我设法通过使用类继承MarkupExpension及的IValueConverter得到这个工作。
public class RoleToVisibilityConverter : MarkupExtension,IValueConverter
{
public RoleToVisibilityConverter()
{
}
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
var principal = value as GenericPrincipal;
bool IsValidUser = false;
if (principal != null)
{
foreach (String role in parameter.ToString().Split(';'))
{
if (principal.IsInRole(role))
{
IsValidUser = true;
break;
}
}
return IsValidUser ? Visibility.Visible : Visibility.Collapsed;
}
return null;
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
throw new NotImplementedException();
}
public override object ProvideValue(IServiceProvider serviceProvider)
{
return this;
}
}
而在XAML我添加以下绑定的可见性：
能见度=“{绑定源= {X：静态systhread：} Thread.CurrentPrincipal中，ConverterParameter =管理员;编辑;只读的，转换器= {RV：RoleToVisibilityConverter}}
注：我还需要添加的xmlns：systhread = “CLR的命名空间：的System.Threading;装配= mscorlib程序” 的MainWindow.xaml。
我的问题是：
是上面的例子来做到这一点或（我想）动态动态加载的知名度绑定的最佳途径。
任何帮助，将不胜感激。
诺埃尔。
你可以尝试使用行为来代替。 我创建了一些简单的代码，你可以看看通过：
public class Permission
{
private List<string> roles = new List<string>();
public List<string> Roles
{
get { return roles; }
set { roles = value; }
}
}
public class PermissionBehavior
{
// Static behaviour parameters
public static readonly Dictionary<FrameworkElement, PermissionBehavior> Instances = new Dictionary<FrameworkElement, PermissionBehavior>();
public static readonly DependencyProperty PermissionProperty =
DependencyProperty.RegisterAttached("Permission", typeof(Permission), typeof(PermissionBehavior),
new PropertyMetadata(OnPermissionPropertyChanged));
public static readonly DependencyProperty RoleProperty =
DependencyProperty.RegisterAttached("Role", typeof(string), typeof(PermissionBehavior),
new PropertyMetadata(OnRolePropertyChanged));
private static void OnPermissionPropertyChanged(DependencyObject dependencyObject,
DependencyPropertyChangedEventArgs e)
{
SetPermission(dependencyObject, (Permission) e.NewValue);
}
public static void SetPermission(DependencyObject obj, Permission value)
{
var behavior = GetAttachedBehavior(obj as FrameworkElement);
behavior.AssociatedObject = obj as FrameworkElement;
obj.SetValue(PermissionProperty, value);
behavior.CurrentPermission = value;
behavior.UpdateVisibility();
}
public static object GetPermission(DependencyObject obj)
{
return obj.GetValue(PermissionProperty);
}
private static void OnRolePropertyChanged(DependencyObject dependencyObject,
DependencyPropertyChangedEventArgs e)
{
SetRole(dependencyObject, (string) e.NewValue);
}
public static void SetRole(DependencyObject obj, string value)
{
var behavior = GetAttachedBehavior(obj as FrameworkElement);
behavior.AssociatedObject = obj as FrameworkElement;
obj.SetValue(RoleProperty, value);
behavior.RoleList = value.Split(',').ToList();
behavior.UpdateVisibility();
}
public static object GetRole(DependencyObject obj)
{
return obj.GetValue(RoleProperty);
}
private static PermissionBehavior GetAttachedBehavior(FrameworkElement obj)
{
if (!Instances.ContainsKey(obj))
{
Instances[obj] = new PermissionBehavior { AssociatedObject = obj };
}
return Instances[obj];
}
static PermissionBehavior()
{
}
// Class instance parameters
private FrameworkElement AssociatedObject { get; set; }
private Permission CurrentPermission { get; set; }
private List<string> RoleList { get; set; }
private void UpdateVisibility()
{
if(RoleList == null || CurrentPermission == null)
return;
if (RoleList.Intersect(CurrentPermission.Roles).Any())
{
AssociatedObject.Visibility = Visibility.Visible;
AssociatedObject.IsEnabled = true;
}
else
{
AssociatedObject.Visibility = Visibility.Hidden;
AssociatedObject.IsEnabled = false;
}
}
}
XAML
<Window x:Class="WpfApplication2.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:my="clr-namespace:WpfApplication2"
Title="MainWindow" Height="350" Width="525">
<Grid>
<StackPanel Orientation="Horizontal" VerticalAlignment="Top">
<Button Content="Requires Admin" Margin="6" my:PermissionBehavior.Permission="{Binding UserPermission, Mode=TwoWay}" my:PermissionBehavior.Role="Admin"/>
<Button Content="Requires User" Margin="6" my:PermissionBehavior.Permission="{Binding UserPermission, Mode=TwoWay}" my:PermissionBehavior.Role="User"/>
</StackPanel>
<Button Content="Change user" HorizontalAlignment="Left" Margin="10,88,0,0" VerticalAlignment="Top" Width="75" Click="ButtonBase_OnClick"/>
</Grid>
</Window>
码
public partial class MainWindow : Window, INotifyPropertyChanged
{
private Permission userPermission;
public Permission UserPermission
{
get { return userPermission; }
set
{
userPermission = value;
OnPropertyChanged("UserPermission");
}
}
public MainWindow()
{
InitializeComponent();
DataContext = this;
UserPermission = new Permission {Roles = new List<string>{"Admin","DumbUser"}};
}
public event PropertyChangedEventHandler PropertyChanged;
protected virtual void OnPropertyChanged(string propertyName)
{
var handler = PropertyChanged;
if (handler != null) handler(this, new PropertyChangedEventArgs(propertyName));
}
private void ButtonBase_OnClick(object sender, RoutedEventArgs e)
{
var p = new Permission();
p.Roles = new List<string> {"User", "Supervisor"};
UserPermission = p;
}
}
这是微不足道的改变我的权限对象和逻辑与你用什么，我想。
