Working with worksheet backgrounds Leave feedback
The API allows you to extract information about all the worksheet backgrounds in an Excel document as shown in the following code sample.
AdvancedUsage.AddingWatermarks.AddWatermarksToSpreadsheets.SpreadsheetGetInformationOfWorksheetBackgrounds
SpreadsheetLoadOptions loadOptions = new SpreadsheetLoadOptions();
// Specify an absolute or relative path to your document. Ex: @"C:\Docs\spreadsheet.xlsx"
using (Watermarker watermarker = new Watermarker("spreadsheet.xlsx", loadOptions))
{
SpreadsheetContent content = watermarker.GetContent<SpreadsheetContent>();
foreach (SpreadsheetWorksheet worksheet in content.Worksheets)
{
if (worksheet.BackgroundImage != null)
{
Console.WriteLine(worksheet.BackgroundImage.Width);
Console.WriteLine(worksheet.BackgroundImage.Height);
Console.WriteLine(worksheet.BackgroundImage.GetBytes().Length);
}
}
}
Following code sample can be used to remove the background of a particular worksheet.
AdvancedUsage.AddingWatermarks.AddWatermarksToSpreadsheets.SpreadsheetRemoveWorksheetBackground
SpreadsheetLoadOptions loadOptions = new SpreadsheetLoadOptions();
// Specify an absolute or relative path to your document. Ex: @"C:\Docs\spreadsheet.xlsx"
using (Watermarker watermarker = new Watermarker("spreadsheet.xlsx", loadOptions))
{
SpreadsheetContent content = watermarker.GetContent<SpreadsheetContent>();
content.Worksheets[0].BackgroundImage = null;
watermarker.Save("spreadsheet.xlsx");
}
You can add watermark to the background images that belong to an Excel document as shown in the below code sample.
AdvancedUsage.AddingWatermarks.AddWatermarksToSpreadsheets.SpreadsheetAddWatermarkToBackgroundImages
SpreadsheetLoadOptions loadOptions = new SpreadsheetLoadOptions();
// Specify an absolute or relative path to your document. Ex: @"C:\Docs\spreadsheet.xlsx"
using (Watermarker watermarker = new Watermarker("spreadsheet.xlsx", loadOptions))
{
// Initialize image or text watermark
TextWatermark watermark = new TextWatermark("Protected image", new Font("Arial", 8));
watermark.HorizontalAlignment = HorizontalAlignment.Center;
watermark.VerticalAlignment = VerticalAlignment.Center;
watermark.RotateAngle = 45;
watermark.SizingType = SizingType.ScaleToParentDimensions;
watermark.ScaleFactor = 1;
SpreadsheetContent content = watermarker.GetContent<SpreadsheetContent>();
foreach (SpreadsheetWorksheet worksheet in content.Worksheets)
{
if (worksheet.BackgroundImage != null)
{
// Add watermark to the image
worksheet.BackgroundImage.Add(watermark);
}
}
watermarker.Save("spreadsheet.xlsx");
}
GroupDocs.Watermark for .NET also allows you to set the background image for a chart inside an Excel document. Following code sample shows how to achieve this functionality.
AdvancedUsage.AddingWatermarks.AddWatermarksToSpreadsheets.SpreadsheetSetBackgroundImageForChart
SpreadsheetLoadOptions loadOptions = new SpreadsheetLoadOptions();
// Specify an absolute or relative path to your document. Ex: @"C:\Docs\spreadsheet.xlsx"
using (Watermarker watermarker = new Watermarker("spreadsheet.xlsx", loadOptions))
{
SpreadsheetContent content = watermarker.GetContent<SpreadsheetContent>();
content.Worksheets[0].Charts[0].ImageFillFormat.BackgroundImage =
new SpreadsheetWatermarkableImage(File.ReadAllBytes("test.png"));
content.Worksheets[0].Charts[0].ImageFillFormat.Transparency = 0.5;
content.Worksheets[0].Charts[0].ImageFillFormat.TileAsTexture = true;
watermarker.Save("spreadsheet.xlsx");
}
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