Comment

This article demonstrates adding, reading, removing, and replying to modern comments using Aspose.Slides for .NET.

Download and run

Download the complete project, extract it, and open Example.sln or run:

dotnet restore Example.sln
dotnet run --project Example.csproj -- --mode evaluation

The download includes every case below, its fixture helpers and inputs. Program.cs runs all cases; use --action block-001 to run one independently. Outputs and an action report are written to the printed output directory. No previous example or working-directory setup is required. Evaluation adds a watermark and can truncate read-back text; the short fixtures still have explicit structural checks. For full text and no watermark, use --mode licensed --license PATH with your own valid license. See the setup guide for supported SDKs and native prerequisites.

Each printed CaseNN.cs file is compiled verbatim with the included Program.cs and bootstrap. Checks run before saving and after reopening the result.

Add a Modern Comment

Create a comment authored by a user and save the presentation.

using System;
using System.IO;
using System.Linq;
using Aspose.Slides;
using Aspose.Slides.Export;
using System.Drawing;

internal static partial class Program
{
    static void Case01()
    {
        using var presentation = new Presentation();
        var slide = presentation.Slides[0];

        var author = presentation.CommentAuthors.AddAuthor("User", "U1");
        author.Comments.AddModernComment("Note", slide, null, new PointF(100, 100), new DateTime(2026, 1, 1));

        presentation.Save("modern_comment.pptx", SaveFormat.Pptx);

        // Validate the in-memory operation and its persisted result independently.
        RoundTrip(presentation, "block-001", p =>
        {
            Context.Require(p.CommentAuthors.Count == 1 && p.CommentAuthors[0].Comments.Count == 1 && p.CommentAuthors[0].Comments[0].Text == "Note", "AddModernComment: semantic check 1 failed.");
        });
        Context.Pass("elements/comment/block-001", "AddModernComment", "save-reopen-structure");
    }
}

Access a Modern Comment

Read a modern comment from an existing presentation.

using System;
using System.IO;
using System.Linq;
using Aspose.Slides;
using Aspose.Slides.Export;

internal static partial class Program
{
    static void Case02()
    {
        using var presentation = new Presentation(Seed("comment"));
        var author = presentation.CommentAuthors[0];

        var comment = (IModernComment)author.Comments[0];
        Console.WriteLine($"Author: {author.Name}, Comment: {comment.Text}, Position: {comment.Position}");

        // Validate the in-memory operation and its persisted result independently.
        RoundTrip(presentation, "block-002", p =>
        {
            Context.Require(p.CommentAuthors[0].Comments[0] is IModernComment && p.CommentAuthors[0].Comments[0].Text == "Note", "AccessModernComment: semantic check 1 failed.");
        });
        Context.Pass("elements/comment/block-002", "AccessModernComment", "save-reopen-structure");
    }
}

Remove a Modern Comment

Remove a comment and save the updated file.

using System;
using System.IO;
using System.Linq;
using Aspose.Slides;
using Aspose.Slides.Export;

internal static partial class Program
{
    static void Case03()
    {
        using var presentation = new Presentation(Seed("comment"));
        var author = presentation.CommentAuthors[0];

        var comment = author.Comments[0];
        comment.Remove();

        presentation.Save("modern_comment_removed.pptx", SaveFormat.Pptx);

        // Validate the in-memory operation and its persisted result independently.
        RoundTrip(presentation, "block-003", p =>
        {
            Context.Require(p.CommentAuthors[0].Comments.Count == 0, "RemoveModernComment: semantic check 1 failed.");
        });
        Context.Pass("elements/comment/block-003", "RemoveModernComment", "save-reopen-structure");
    }
}

Reply to a Modern Comment

Add replies to a parent modern comment.

using System;
using System.IO;
using System.Linq;
using Aspose.Slides;
using Aspose.Slides.Export;
using System.Drawing;

internal static partial class Program
{
    static void Case04()
    {
        using var presentation = new Presentation();
        var slide = presentation.Slides[0];

        var author = presentation.CommentAuthors.AddAuthor("User", "U1");

        var parentComment = author.Comments.AddModernComment("Root", slide, null, new PointF(100, 100), new DateTime(2026, 1, 1));
        var reply1 = author.Comments.AddModernComment("One", slide, null, new PointF(110, 100), new DateTime(2026, 1, 1));
        var reply2 = author.Comments.AddModernComment("Two", slide, null, new PointF(120, 100), new DateTime(2026, 1, 1));

        reply1.ParentComment = parentComment;
        reply2.ParentComment = parentComment;

        presentation.Save("modern_comment_replies.pptx", SaveFormat.Pptx);

        // Validate the in-memory operation and its persisted result independently.
        RoundTrip(presentation, "block-004", p =>
        {
            Context.Require(p.CommentAuthors[0].Comments.Count == 3 && p.CommentAuthors[0].Comments[1].ParentComment == p.CommentAuthors[0].Comments[0] && p.CommentAuthors[0].Comments[2].ParentComment == p.CommentAuthors[0].Comments[0], "ReplyToModernComment: semantic check 1 failed.");
        });
        Context.Pass("elements/comment/block-004", "ReplyToModernComment", "save-reopen-structure");
    }
}
Header Footer Note