Updating the blog contents from within PublishNotificationHook

PublishingContextExtensions.cs

// based on an old blog post in Japanese: http://blog.sharplab.net/computer/cprograming/windowslivewriter/433/
// The field was moved to a base type in the latest version of Live Writer

using System.Reflection;
using WindowsLive.Writer.Api;
using WindowsLive.Writer.Extensibility.BlogClient;
using WindowsLive.Writer.PostEditor;

namespace WindowsLiveWriterPlugin.Extensions
{
    public static class PublishingContextExtensions
    {
        public static void ReplaceText(this IPublishingContext publishingContext, string newText)
        {
            FieldInfo fieldInfo = publishingContext.GetType().BaseType.GetField("_editingContext", BindingFlags.NonPublic | BindingFlags.Instance);
            BlogPostEditingManager manager = (BlogPostEditingManager)fieldInfo.GetValue(publishingContext);
            BlogPost blogPost = (BlogPost)publishingContext.PostInfo;

            blogPost.Contents = newText;

            manager.EditPost(new BlogPostEditingContext(manager.BlogId, blogPost));
        }
    }
}