This topic showcases the implementation of a simple themes application which includes a C1Ribbon and ComboBox with a list of all the inbuilt themes.

To create a simple WinForms application in .NET for Themes control, complete the following steps:

1. Initialize the C1Themes object.

   • C#

   // Initialize C1Theme object
           C1Theme theme;   
   

2. Initialize the C1Themes class.

   • C#

   // Initialize C1Themes class
               theme = new C1Theme();
   

3. Add the following code to the form load event:

   • C#

   theme = null; 
    // Add C11ThemeController
    cmb_list.Items.Clear();
    string[] themes = C1ThemeController.GetThemes();
    cmb_list.Items.Add("(No Theme)");
    foreach (string theme in themes)
        cmb_list.Items.Add(theme);
    cmb_list.SelectedIndex = 0;
   

4. Add a combobox with name cmb_list and button with name btn_apply.

5. Add the following code to the SelectedIndexChanged event of the ComboBox.

   • C#

   private void cmb_list_SelectedIndexChanged(object sender, EventArgs e)
   {
       C1Theme theme = null;
       try
       {
           theme = C1ThemeController.GetThemeByName(cmb_list.Text, false);
       }
       catch
       {
   
       }
       if (theme != null)
       {
           C1ThemeController.ApplyThemeToControlTree(c1Ribbon1, theme);
       }
   }
   

   The GetThemeByName method in C1ThemeController class retrieves a theme registered with the application, while the ApplyThemeToControlTree method recursively applies a theme to a control.

6. Run the code and observe the output.

    

   Also, you can directly apply the specific theme using the following code:

   C#	Copy Code
   var theme = C1ThemeController.GetThemeByName("Office2016Green", false); // Apply theme to all controls on the form C1ThemeController.ApplyThemeToControlTree(this, theme);

   Note that in the above code, in place of C1Ribbon, you can use a control name specific to your requirement.

   You can also check the product sample specific to the Ribbon implementation with the Themes control, at Documents\ComponentOne Samples\WinForms\C1Themes\C1RibbonBasedApp.