Spire.Cloud.PowerPoint provides the SlidesApi interface to handle a specific slide inside a PowerPoint presentation. This article shows you how to add background color or image to a slide by using this API.

Example 1. Set background color

using Spire.Cloud.Powerpoint.Sdk.Client;
using Spire.Cloud.Powerpoint.Sdk.Api;

namespace SetBackgroundColor
{
    class Program
    {
        static string appId = "App ID";
        static string appKey = "App Key";
        static string baseUrl = "https://api.cloudxdocs.com";

        //Create a Configuration object based on App ID, App Key and base URL
        static Configuration configuration = new Configuration(appId, appKey, baseUrl);

        //Create a SlidesApi object
        static SlidesApi slidesApi = new SlidesApi(configuration);

        static void Main(string[] args)
        {
            //Specify the source document name
            string name = "sample.pptx";

            //Specify the slide index 
            int? slideIndex = 0;

            //Specify the color
            string color = "#BCD2EE";

            //Specify the original password, set to null if there is no password
            string password = null;

            //Specify the folder where the source document is stored
            string folder = "input";

            //Use the default storage, set to null
            string storage = null;

            //Call SetSlideBackgroundColor to set background color for the specified slide
            slidesApi.SetSlideBackgroundColor(name, slideIndex, color, folder, password, storage);
        }
    }
}

Example 2. Set background image

using Spire.Cloud.Powerpoint.Sdk.Client;
using Spire.Cloud.Powerpoint.Sdk.Api;
using Spire.Cloud.Powerpoint.Sdk.Model;

namespace SetBackgroundImage
{
    class Program
    {
        static string appId = "App ID";
        static string appKey = "App Key";
        static string baseUrl = "https://api.cloudxdocs.com";

        //Create a Configuration object based on App ID, App Key and base URL
        static Configuration configuration = new Configuration(appId, appKey, baseUrl);

        //Create a SlidesApi object
        static SlidesApi slidesApi = new SlidesApi(configuration);

        static void Main(string[] args)
        {
            //Specify the source document name
            string name = "sample.pptx";

            //Specify the slide index 
            int? slideIndex = 0;

            //Load an image from URL
            string fileName = "input/image.jpg";
            ResourceUriElement image = new ResourceUriElement(new ResourceUri(fileName));

            //Create a SlideBackground object 
            SlideBackground background = new SlideBackground("custom");

            //Fill the background with image
            background.FillFormat = new PictureFill(0, 0, 0, 0, 96, image, null, null, "Stretch");

            //Specify the original password, set to null if there is no password
            string password = null;

            //Specify the folder where the source document is stored
            string folder = "input";

            //Use the default storage, set to null
            string storage = null;
            var response = slidesApi.SetSlideBackground(name, slideIndex, background, folder, password, storage);
        }
    }
}