How can I list colors in WPF with XAML?

问题:

How can I get list of all colors I can pick in Visual Studio Designer (which is System.Windows.Media.Colors, but that isn't a collection) and put them into my own ComboBox using WPF and XAML markup?

回答1:

Here is the pure XAML solution.

In your resources section, you would use this:

<!-- Make sure this namespace is declared so that it's in scope below -->
.. xmlns:sys="clr-namespace:System;assembly=mscorlib" ..

<ObjectDataProvider MethodName="GetType" 
    ObjectType="{x:Type sys:Type}" x:Key="colorsTypeOdp">
    <ObjectDataProvider.MethodParameters>
        <sys:String>System.Windows.Media.Colors, PresentationCore,
            Version=3.0.0.0, Culture=neutral, 
            PublicKeyToken=31bf3856ad364e35</sys:String>
    </ObjectDataProvider.MethodParameters>
</ObjectDataProvider>
<ObjectDataProvider ObjectInstance="{StaticResource colorsTypeOdp}"  
    MethodName="GetProperties" x:Key="colorPropertiesOdp">
</ObjectDataProvider>

Or, as CodeNaked points out, it can be reduced to one tag:

<ObjectDataProvider 
    ObjectInstance="{x:Type Colors}" 
    MethodName="GetProperties" 
    x:Key="colorPropertiesOdp" />

And then the combobox would look like this:

<ComboBox Name="comboBox1" 
    ItemsSource="{Binding Source={StaticResource colorPropertiesOdp}}"
    DisplayMemberPath="Name"
    SelectedValuePath="Name" />

回答2:

Here is a great ItemTemplate to use for a combobox using casperOne's code:

<ComboBox Name="cboColors"
          ItemsSource="{Binding Source={StaticResource colorPropertiesOdp}}"
          SelectedValuePath="Name">
     <ComboBox.ItemTemplate>
        <DataTemplate>
           <StackPanel Orientation="Horizontal" Height="18" Margin="0,0,0,2">
              <Border BorderThickness="1" CornerRadius="2" 
                  BorderBrush="Black" Width="50" VerticalAlignment="Stretch"
                  Background="{Binding Name}"/>
              <TextBlock Text="{Binding Name}" Margin="8,0,0,0"/>
           </StackPanel>
         </DataTemplate>
     </ComboBox.ItemTemplate>
</ComboBox>

回答3:

Here is what I have done in a past ASP.net app:

// populate colors drop down (will work with other kinds of list controls)
Type colors = typeof(System.Drawing.Color);
PropertyInfo[] colorInfo = colors.GetProperties(BindingFlags.Public |
    BindingFlags.Static);
foreach ( PropertyInfo info in colorInfo)
{
    ddlColor.Items.Add(info.Name);                
}

// Get the selected color
System.Drawing.Color selectedColor = 
    System.Drawing.Color.FromName(ddlColor.SelectedValue);

回答4:

Here's how to do it in code using reflection. The following will dump all predefined WPF color names to Output:

using System.Reflection;

void ListAllColors()
{
    Type colorsType = typeof(System.Windows.Media.Colors);
    PropertyInfo[] colorsTypePropertyInfos = colorsType.GetProperties(BindingFlags.Public | BindingFlags.Static);

    foreach (PropertyInfo colorsTypePropertyInfo in colorsTypePropertyInfos)
        Debug.WriteLine(colorsTypePropertyInfo.Name);
}

And to put them in a combobox, you could simply change the last line to:

_comboBox.Items.Add(colorsTypePropertyInfo.Name);