gistfile1.cs

using System;
using MonoTouch.AssetsLibrary;
using MonoTouch.Foundation;

namespace BigTed
{
    public class ImageLibraryUtils
    {
        private ALAssetsLibrary assetsLibrary;
        public ImageLibraryUtils()
        {
            assetsLibrary = new ALAssetsLibrary();

        }
        public void SaveImageToLibrary(NSData image, string albumName, Action<bool, string> complete)
        {

            assetsLibrary.WriteImageToSavedPhotosAlbum(image, new NSDictionary(), delegate(NSUrl assetURL, NSError error) {
                    if (error != null)
                    {
                        complete(false, error.Description);
                        return;
                    }

                    AddAssetUrlToAlbum(assetURL, albumName, complete);

               });


        }

        public void AddAssetUrlToAlbum(NSUrl assetUrl, string albumName, Action<bool, string> complete)
        {
            bool wasFound = false;
            assetsLibrary.Enumerate(ALAssetsGroupType.Album, delegate(ALAssetsGroup @group, ref bool stop) {
                try
                {
                    if (group != null && albumName == @group.Name)
                    {
                        wasFound = true;
                        assetsLibrary.AssetForUrl(assetUrl, delegate(ALAsset asset) {
                           @group.AddAsset(asset);
                            complete(true, "Image was added to the album");

                       }, delegate(NSError error) {
                            complete(false, error.Description);
                       });

                       return;
                    }

                    if (!wasFound && @group == null)
                    {
                        assetsLibrary.AddAssetsGroupAlbum(albumName, delegate(ALAssetsGroup @group2) {
                            assetsLibrary.AssetForUrl(assetUrl, delegate(ALAsset asset) {
                                @group2.AddAsset(asset);
                                complete(true, "Image was added to the album");
                                
                            }, delegate(NSError error) {
                                complete(false, error.Description);
                            });
                        }, delegate(NSError error) {
                            complete(false, error.Description);
                        });
                    }
                } catch (Exception ex)
                {
                    complete(false, "Error saving to the library");
                }

            }, delegate(NSError error) {
                complete(false, error.Description);
            });
        }
    }
}