OfficeImage.DiscardCachedData() Method

Closes the current image stream and releases any resources associated with the current stream.

Namespace: DevExpress.Office.Utils

Assembly: DevExpress.Office.v23.2.Core.dll

NuGet Packages: DevExpress.Office.Core, DevExpress.Win.Navigation

Declaration

C#

public virtual void DiscardCachedData()

VB.NET

Public Overridable Sub DiscardCachedData

Remarks

Call the DiscardCachedData method before exporting a custom painted image to a PDF file to preserve your modifications. This method clears the current image stream containing no information about the modified image and creates a new one that is aware of the modifications performed. The example below demonstrates this approach:

C#

Document doc = richEditControl1.Document;
ReadOnlyDocumentImageCollection images = doc.Images.Get(doc.Range);
foreach (var img in images) {
using (Graphics gr = Graphics.FromImage(img.Image.NativeImage)) {
        // Perform custom painting... 
    }
    img.Image.DiscardCachedData();
}
richEditControl1.ExportToPdf(pdfStream);

VB.NET

Dim doc As Document = richEditControl1.Document
Dim images As ReadOnlyDocumentImageCollection = doc.Images.Get(doc.Range)
For Each img In images
Using gr As Graphics = Graphics.FromImage(img.Image.NativeImage)
        ' Perform custom painting... 
End Using
    img.Image.DiscardCachedData()
Next img
richEditControl1.ExportToPdf(pdfStream)