Find and Replace in Presentation

Following are the steps to follow:

1. Open a presentation.
2. Search the text.
3. Replace the text.
4. Write the presentation.

using Aspose.Slides;
using Aspose.Slides.Export;
using Aspose.Slides.Util;

string filePath = @"..\..\..\Sample Files\";
string strToFind = "old text";
string strToReplaceWith = "new text";

//Open the presentation
using (Presentation pres = new Presentation(filePath + "Find and Replace.pptx"))
{
    //Get all text boxes in the first slide
    ITextFrame[] textFrames = SlideUtil.GetAllTextBoxes(pres.Slides[0]);

    foreach (ITextFrame textFrame in textFrames)
        foreach (IParagraph para in textFrame.Paragraphs)
            foreach (IPortion port in para.Portions)
            {
                //Find the text to be replaced
                int idx = port.Text.IndexOf(strToFind);
                if (idx < 0)
                    continue;

                //Replace the existing text with the new text
                string str = port.Text;
                string strStartText = str.Substring(0, idx);
                string strEndText = str.Substring(idx + strToFind.Length);

                port.Text = strStartText + strToReplaceWith + strEndText;
            }

    pres.Save(filePath + "Find and Replace.pptx", SaveFormat.Pptx);
}

Download Sample Code

• Github
• Bitbucket