Blogger C# API

Source: http://google-gdata.googlecode.com/svn/trunk/clients/cs/samples/blogger/ConsoleSample.cs

using System;
using System.Text;
using Google.GData.Client;
using System.Net;
using System.Xml;
using System.Text.RegularExpressions;

namespace BloggerDevSample
{
    class ConsoleSample
    {
        /** Lists the user's blogs. */
        static void ListUserBlogs(Service service)
        {
            Console.WriteLine("\nRetrieving a list of blogs");
            FeedQuery query = new FeedQuery();
            // Retrieving a list of blogs
            query.Uri = new Uri("http://www.blogger.com/feeds/default/blogs");
            AtomFeed feed = null;
            feed = service.Query(query);
            foreach (AtomEntry entry in feed.Entries)
            {
                Console.WriteLine("  Blog title: " + entry.Title.Text);
            }
        }

        /** Lists the user's blogs and returns the URI for posting new entries
         * to the blog which the user selected.
         */
        static Uri SelectUserBlog(Service service)
        {
            Console.WriteLine("\nPlease select a blog on which to post.");
            FeedQuery query = new FeedQuery();
            // Retrieving a list of blogs
            query.Uri = new Uri("http://www.blogger.com/feeds/default/blogs");
            AtomFeed feed = service.Query(query);

            // Publishing a blog post
            Uri blogPostUri = null;
            if (feed != null)
            {
                foreach (AtomEntry entry in feed.Entries)
                {
                    // Print out the title of the Blog
                    Console.WriteLine("  Blog name: " + entry.Title.Text);
                    Console.Write("  Post to this blog? (y/n): ");
                    if (Console.ReadLine().Equals("y"))
                    {
                        // find the href in the link with a rel pointing to the blog's feed
                        for (int i = 0; i < entry.Links.Count; i++)
                        {
                            if (entry.Links[i].Rel.Equals("http://schemas.google.com/g/2005#post"))
                            {
                                blogPostUri = new Uri(entry.Links[i].HRef.ToString());
                                Console.WriteLine("  Your new posts will be sent to " + blogPostUri.AbsoluteUri.ToString());
                            }
                        }
                        return blogPostUri;
                    }
                }
            }
            return blogPostUri;
        }

        /** Creates a new blog entry and sends it to the specified Uri */
        static AtomEntry PostNewEntry(Service service, Uri blogPostUri)
        {
            Console.WriteLine("\nPublishing a blog post");
            AtomEntry createdEntry = null;
            if (blogPostUri != null)
            {
                // construct the new entry
                AtomEntry newPost = new AtomEntry();
                newPost.Title.Text = "Marriage!";
                newPost.Content = new AtomContent();
                newPost.Content.Content = "
" +
                    "
Mr. Darcy has proposed marriage to me!
" +
                    "
He is the last man on earth I would ever desire to marry.
" +
                    "
Whatever shall I do?
" +
                    "
";
                newPost.Content.Type = "xhtml";
                newPost.Authors.Add(new AtomPerson());
                newPost.Authors[0].Name = "Elizabeth Bennet";
                newPost.Authors[0].Email = "liz@gmail.com";

                createdEntry = service.Insert(blogPostUri, newPost);
                if (createdEntry != null)
                {
                    Console.WriteLine("  New blog post created with title: " + createdEntry.Title.Text);
                }
            }
            return createdEntry;
        }

        /** Creates a new blog entry and sends it to the specified Uri */
        static void PostAndDeleteNewDraftEntry(Service service, Uri blogPostUri)
        {
            Console.WriteLine("\nCreating a draft blog post");
            AtomEntry draftEntry = null;
            if (blogPostUri != null)
            {
                // construct the new entry
                AtomEntry newPost = new AtomEntry();
                newPost.Title.Text = "Marriage! (Draft)";
                newPost.Content = new AtomContent();
                newPost.Content.Content = "
" +
                    "
Mr. Darcy has proposed marriage to me!
" +
                    "
He is the last man on earth I would ever desire to marry.
" +
                    "
Whatever shall I do?
" +
                    "
";
                newPost.Content.Type = "xhtml";
                newPost.Authors.Add(new AtomPerson());
                newPost.Authors[0].Name = "Elizabeth Bennet";
                newPost.Authors[0].Email = "liz@gmail.com";
                newPost.IsDraft = true;

                draftEntry = service.Insert(blogPostUri, newPost);
                if (draftEntry != null)
                {
                    Console.WriteLine("  New draft post created with title: " + draftEntry.Title.Text);
                    // Delete the newly created draft entry
                    Console.WriteLine("  Press enter to delete the draft blog post");
                    Console.ReadLine();
                    draftEntry.Delete();
                }
            }
        }

        /** Display the titles for all entries in the previously selected blog. */
        static void ListBlogEntries(Service service, Uri blogUri)
        {
            if (blogUri != null)
            {
                Console.WriteLine("\nRetrieving all blog posts");
                // Retrieve all posts in a blog
                FeedQuery query = new FeedQuery();
                Console.WriteLine("  Query URI: " + blogUri.ToString());
                query.Uri = blogUri;
                AtomFeed feed = service.Query(query);
                foreach (AtomEntry entry in feed.Entries)
                {
                    Console.WriteLine("  Entry Title: " + entry.Title.Text);
                }
            }
        }

        /** Display title for entries in the blog in the hard coded date range. */
        static void ListBlogEntriesInDateRange(Service service, Uri blogUri)
        {
            Console.WriteLine("\nRetrieving posts using query parameters");
            // Retrieve all posts in a blog between Jan 1, 2006 and Apr 12, 2007
            FeedQuery query = new FeedQuery();
            query.Uri = blogUri;
            query.MinPublication = new DateTime(2006, 1, 1);
            query.MaxPublication = new DateTime(2007, 4, 12);
            AtomFeed feed = service.Query(query);
            foreach (AtomEntry entry in feed.Entries)
            {
                Console.WriteLine("  Entry Title: " + entry.Title.Text);
            }
        }

        /** Change the contents of the newly created blog entry. */
        static AtomEntry EditEntry(AtomEntry toEdit)
        {
            Console.WriteLine("\nUpdating post");
            // Edit the new entry
            if (toEdit != null)
            {
                toEdit.Title.Text = "Marriage Woes!";
                Console.WriteLine("  Press enter to update");
                Console.ReadLine();
                toEdit = toEdit.Update();
            }
            return toEdit;
        }

        /** Delete the specified blog entry. */
        static void DeleteEntry(AtomEntry toDelete)
        {
            Console.WriteLine("\nDeleting post");
            // Delete the edited entry
            if (toDelete != null)
            {
                Console.WriteLine("  Press enter to delete the new blog post");
                Console.ReadLine();
                toDelete.Delete();
            }
        }

        /** Get the comments feed URI for the desired blog entry. */
        static Uri SelectBlogEntry(Service service, Uri blogPostUri)
        {
            Console.WriteLine("\nPlease select a blog entry on which to comment.");
            FeedQuery query = new FeedQuery();
            query.Uri = blogPostUri;
            AtomFeed feed = service.Query(query);
            Uri commentPostUri = null;

            if (feed != null)
            {
                foreach (AtomEntry entry in feed.Entries)
                {
                    // Print out the title of the Blog
                    Console.WriteLine("  Blog entry title: " + entry.Title.Text);
                    Console.Write("  Post a comment on this entry? (y/n): ");

                    if (Console.ReadLine().Equals("y"))
                    {
                        // Create the Post URL for adding a comment by finding this entry's id number.

                        // Find the href in the link with a rel pointing to the blog's feed.
                        for (int i = 0; i < entry.Links.Count; i++)
                        {
                            
                            if (entry.Links[i].Rel == "edit")
                            {
                                string commentUriStart = Regex.Replace(blogPostUri.ToString(), "/posts/default", "");
                                string selfLink = entry.Links[i].HRef.ToString();
                                string entryId = Regex.Replace(selfLink, blogPostUri.ToString() + "/", "");
                                // Build the comment URI from the blog id in and the entry id.
                                commentPostUri = new Uri(commentUriStart + "/" + entryId + "/comments/default");
                                Console.WriteLine("  Your new comments will be sent to " + commentPostUri.ToString());
                                return commentPostUri;
                            }
                        }
                    }
                }
            }

            return commentPostUri;
        }

        static AtomEntry PostNewComment(Service service, Uri commentPostUri)
        {
            Console.WriteLine("\nCommenting on a blog post");
            AtomEntry postedComment = null;
            if (commentPostUri != null)
            {
                // Add a comment.
                AtomEntry comment;
                comment = new AtomEntry();
                comment.Title.Text = "This is my first comment";
                comment.Content.Content = "This is my first comment";
                comment.Authors.Add(new AtomPerson());
                comment.Authors[0].Name = "Blog Author Name";
                postedComment = service.Insert(commentPostUri, comment);
                Console.WriteLine("  Result's title: " + postedComment.Title.Text);
            }
            return postedComment;
        }

        static void ListEntryComments(Service service, Uri commentUri)
        {
            if (commentUri != null)
            {
                Console.WriteLine("\nRetrieving all blog post comments");
                // Retrieve all comments on a blog entry
                FeedQuery query = new FeedQuery();
                Console.WriteLine("  Query URI: " + commentUri.ToString());
                query.Uri = commentUri;
                AtomFeed feed = service.Query(query);
                foreach (AtomEntry entry in feed.Entries)
                {
                    Console.WriteLine("  Comment Title: " + entry.Title.Text);
                }
            }
        }

        static void DeleteComment(AtomEntry commentEntry)
        {
            Console.WriteLine("\nDeleting the comment");
            if (commentEntry != null)
            {
                // Delete the comment.
                Console.WriteLine("  Press enter to delete the new comment post");
                Console.ReadLine();
                commentEntry.Delete();
            }
        }

        static void Main(string[] args)
        {
            Service service = new Service("blogger", "blogger-example");

            // ClientLogin using username/password authentication
            string username;
            string password;
            if (args.Length != 2)
            {
                Console.WriteLine("Usage: BloggerDevSample.exe <username> <password>");
                return;
            }
            else
            {
                username = args[0];
                password = args[1];
            }

            service.Credentials = new GDataCredentials(username, password);

            ListUserBlogs(service);
            Uri blogPostUri = SelectUserBlog(service);
            AtomEntry createdEntry = PostNewEntry(service, blogPostUri);
            PostAndDeleteNewDraftEntry(service, blogPostUri);
            ListBlogEntries(service, blogPostUri);
            ListBlogEntriesInDateRange(service, blogPostUri);
            AtomEntry editedEntry = EditEntry(createdEntry);
            DeleteEntry(editedEntry);
            Uri commentPostUri = SelectBlogEntry(service, blogPostUri);
            AtomEntry commentEntry = PostNewComment(service, commentPostUri);
            ListEntryComments(service, commentPostUri);
            DeleteComment(commentEntry);

            Console.WriteLine("Press enter to quit");
            Console.ReadLine();
        }
    }
}