Sets the background to the current slide master.
| Name | Type | Description |
| oApiFill | ApiFill | The color or pattern used to fill the presentation slide master background. |
builder.CreateFile("pptx");
var oPresentation = Api.GetPresentation();
var oSlide = oPresentation.GetSlideByIndex(0);
var oMaster = oPresentation.GetMaster(0);
var oRGBColor = Api.CreateRGBColor(255, 213, 191);
var oGs1 = Api.CreateGradientStop(oRGBColor, 0);
var oGs2 = Api.CreateGradientStop(Api.CreateRGBColor(255, 111, 61), 100000);
var oFill = Api.CreateRadialGradientFill([oGs1, oGs2]);
oMaster.SetBackground(oFill);
oFill = Api.CreateSolidFill(Api.CreateRGBColor(51, 51, 51));
var oStroke = Api.CreateStroke(0, Api.CreateNoFill());
var oShape = Api.CreateShape("flowChartMagneticTape", 200 * 36000, 130 * 36000, oFill, oStroke);
oShape.SetPosition(608400, 1267200);
oShape.SetSize(300 * 36000, 130 * 36000);
oMaster.AddObject(oShape);
builder.SaveFile("pptx", "SetBackground.pptx");
builder.CloseFile();