有什么办法绑定字典 <enum, bool> 切换到Xamarin.Forms？

Question

I have a Dictionary which comes from an API with enumeration as a key and bool as a value eg:

Dictionary = new Dictionary<Permissions, bool>();
Dictionary.Add(Permissions.Create, true);
Dictionary.Add(Permissions.Delete, false);
...

I need to show a bunch of Switches on UI accordingly to permissions eg:

<Switch
  IsToggled="{Binding Dictionary[Create]}"/>
<Switch
  IsToggled="{Binding Dictionary[Delete]}"/>

But this doesn't work. It could work only if key was a string.

So is there any way to use Dictionary with enum key as a bindable property?

Answer 1

You can try to use a intermediate variable. Here is the code for your reference.

Page1.xaml

<StackLayout Orientation="Horizontal">
        <Label Text="Create:Ture" VerticalOptions="Start"></Label>
        <Switch x:Name="SWitch" VerticalOptions="Start"  IsToggled="{Binding IsToggled}"></Switch>
    </StackLayout>

Page1.xaml.cs

public partial class Page1 : ContentPage
{

    public static Dictionary<string, bool> keyValuePairs = new Dictionary<string, bool>();
    public Page1()
    {
        InitializeComponent();
        keyValuePairs.Add("Create", true);
        SWitch.BindingContext = new SwitchModel(); 
    }
}

SwitchModel.cs

class SwitchModel : INotifyPropertyChanged
{

    bool isToggle;
    public SwitchModel()
    {
        IsToggled = Page1.keyValuePairs["Create"];
    }
    public bool IsToggled
    {
        set { SetProperty(ref isToggle, value); }
        get { return isToggle; }
    }
    bool SetProperty<T>(ref T storage, T value, [CallerMemberName] string propertyName = null)
    {
        if (Object.Equals(storage, value))
            return false;
        storage = value;
        OnPropertyChanged(propertyName);
        return true;
    }
    protected void OnPropertyChanged([CallerMemberName] string propertyName = null)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }
    public event PropertyChangedEventHandler PropertyChanged;
 }

The result: enter image description here

Answer 2

IsToggled与bool值绑定，然后必须将其与bool属性绑定