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I want to give the possibility to users to choose my Xamarin.Forms application UI theme. I should change the color values in my application static resources.

<Application.Resources>
    <ResourceDictionary x:Name="ColorResources">


        <Color x:Key="BgBar">#ffffff</Color>
        <Color x:Key="BgHeaderShellMenu">#b3e5fc</Color>
        <Color x:Key="BgMenu">#b3e5fc</Color>
        <Color x:Key="BgMainPage">#b3e5fc</Color>
        <Color x:Key="BgMainPageMenu">#b3e5fc</Color>
        <Color x:Key="ForeGroundBar">#82b3c9</Color>
        <Color x:Key="SelectedTabBar">#82b3c9</Color>
        <Color x:Key="DisabledTabBar">#575757</Color>
        <Color x:Key="TtileTabBar">#82b3c9</Color>
        <Color x:Key="UnselectedTabBar">#b3e5fc</Color>
        <Color x:Key="UnSelectedTabBarLable">#82b3c9</Color>
        <Color x:Key="MenuText">#82b3c9</Color>
        <Color x:Key="Border">#82b3c9</Color>
        <Color x:Key="SelectedTabBarLable">#b3e5fc</Color>
        <Color x:Key="MenuLabel">#82b3c9</Color>
        <Color x:Key="Primary">#2196F3</Color>
        <Color x:Key="Dark">#b3e5fc</Color>

        <Style TargetType="Button">
            <Setter Property="TextColor" Value="White"></Setter>
            <Setter Property="VisualStateManager.VisualStateGroups">
                <VisualStateGroupList>
                    <VisualStateGroup x:Name="CommonStates">
                        <VisualState x:Name="Normal">
                            <VisualState.Setters>
                                <Setter Property="BackgroundColor" Value="{StaticResource BgBar}" />
                            </VisualState.Setters>
                        </VisualState>
                        <VisualState x:Name="Disabled">
                            <VisualState.Setters>
                                <Setter Property="BackgroundColor" Value="#332196F3" />
                            </VisualState.Setters>
                        </VisualState>
                    </VisualStateGroup>
                </VisualStateGroupList>
            </Setter>
        </Style>
    </ResourceDictionary>
</Application.Resources>

this is my application static resources but, I can’t change the values of it because they’re all

readonly

So I tried this :

private List<Tuple<string, string>> DarkThemeKVs = new List<Tuple<string, string>>()
    {
     new Tuple<string, string>("BgBar","#121212"),
     new Tuple<string, string>("BgHeaderShellMenu","#121212"),
     new Tuple<string, string>("BgMainPage","#121212"),
     new Tuple<string, string>("BgMainPageMenu","#121212"),
     new Tuple<string, string>("BgMenu","#121212"),
     new Tuple<string, string>("ForeGroundBar","#cc2402"),
     new Tuple<string, string>("SelectedTabBar","#cc2402"),
     new Tuple<string, string>("DisabledTabBar","#575757"),
     new Tuple<string, string>("TtileTabBar","#cc2402"),
     new Tuple<string, string>("UnselectedTabBar","#121212"),
     new Tuple<string, string>("UnSelectedTabBarLable","#cc2402"),
     new Tuple<string, string>("MenuText","#cc2402"),
     new Tuple<string, string>("Border","#cc2402"),
     new Tuple<string, string>("SelectedTabBarLable","#121212"),
     new Tuple<string, string>("MenuLabel","#cc2402"),
    
    };

if (Theme == "darktheme")
            {
                ResourceDictionary Rd = new ResourceDictionary();
                foreach (var item in this.DarkThemeKVs)
                {
                    Rd.Add(item.Item1, item.Item2);
                }
                this.Resources = Rd;
            }

But I got an exception because values can’t be strings. The type of value should be like this : enter image description here

What should I do? What’s the name of this type in c#?

Anonymous Asked question May 14, 2021