Asp.net相册管理代码

来源：互联网发布：复旦cpu卡密码算法编辑：程序博客网时间：2024/06/02 07:03
using System;
using System.Collections;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.IO;
using System.Web;
public class PhotoManager
{
    // 指定数据库连接串
    public static string ConnString = "server=****;database=****; uid=sa; pwd=****; pooling=true";
    //读取数据库中的照片
    public static Stream GetPhoto(int photoid, PhotoSize size)
    {
        using (SqlConnection connection = new SqlConnection(ConnString))
        {
            using (SqlCommand command = new SqlCommand("GetPhoto", connection))
            {
                command.CommandType = CommandType.StoredProcedure;
                command.Parameters.Add(new SqlParameter("@PhotoID", photoid));
                command.Parameters.Add(new SqlParameter("@Size", (int)size));
                bool filter =
!(HttpContext.Current.User.IsInRole("Friends") ||
HttpContext.Current.User.IsInRole("Administrators"));
                command.Parameters.Add(new SqlParameter("@IsPublic", filter));
                connection.Open();
                object result = command.ExecuteScalar();
                try
                {
                    return new MemoryStream((byte[])result);
                }
                catch
                {
                    return null;
                }
            }
        }
    }
    //获取默认图片
    public static Stream GetPhoto(PhotoSize size)
    {
        string path = HttpContext.Current.Server.MapPath("~/Images/");
        switch (size)
        {
            case PhotoSize.Small:
                path += "placeholder-100.jpg";
                break;
            case PhotoSize.Medium:
                path += "placeholder-200.jpg";
                break;
            case PhotoSize.Large:
                path += "placeholder-600.jpg";
                break;
            default:
                path += "placeholder-600.jpg";
                break;
        }
        return new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.Read);
    }
    //获取最新上传的一张图片,显示在主页中
    public static Stream GetFirstPhoto(int albumid, PhotoSize size)
    {
        using (SqlConnection connection = new SqlConnection(ConnString))
        {
            using (SqlCommand command = new SqlCommand("GetFirstPhoto", connection))
            {
                command.CommandType = CommandType.StoredProcedure;
                command.Parameters.Add(new SqlParameter("@AlbumID", albumid));
                command.Parameters.Add(new SqlParameter("@Size", (int)size));
                bool filter =
!(HttpContext.Current.User.IsInRole("Friends") ||
HttpContext.Current.User.IsInRole("Administrators"));
                command.Parameters.Add(new SqlParameter("@IsPublic", filter));
                connection.Open();
                object result = command.ExecuteScalar();
                try
                {
                    return new MemoryStream((byte[])result);
                }
                catch
                {
                    return null;
                }
            }
        }
    }
    //此方法用于获取一个相册里(根据AlbumID指定)的所有图片
    public static List<Photo> GetPhotos(int AlbumID)
    {
        using (SqlConnection connection = new SqlConnection(ConnString))
        {
            using (SqlCommand command = new SqlCommand("GetPhotos", connection))
            {
                command.CommandType = CommandType.StoredProcedure;
                command.Parameters.Add(new SqlParameter("@AlbumID", AlbumID));
                bool filter =
!(HttpContext.Current.User.IsInRole("Friends") ||
HttpContext.Current.User.IsInRole("Administrators"));
                command.Parameters.Add(new SqlParameter("@IsPublic", filter));  //是否公开
                connection.Open();
                List<Photo> list = new List<Photo>();
                using (SqlDataReader reader = command.ExecuteReader())
                {
                    while (reader.Read())
                    {
                        Photo temp = new Photo(
                            (int)reader["PhotoID"],
                            (int)reader["AlbumID"],
                            (string)reader["Caption"]);
                        list.Add(temp);
                    }
                }
                return list;
            }
        }
    }
    //随机指定一个相册中的图片
    public static List<Photo> GetPhotos()
    {
        return GetPhotos(GetRandomAlbumID());
    }
    //添加图片(指定相册号,标题,以及原始图片
    public static void AddPhoto(int AlbumID, string Caption, byte[] BytesOriginal)
    {
        using (SqlConnection connection = new SqlConnection(ConnString))
        {
            using (SqlCommand command = new SqlCommand("AddPhoto", connection))
            {
                command.CommandType = CommandType.StoredProcedure;
                command.Parameters.Add(new SqlParameter("@AlbumID", AlbumID));
                command.Parameters.Add(new SqlParameter("@Caption", Caption));
                command.Parameters.Add(new SqlParameter("@BytesOriginal", BytesOriginal));
                command.Parameters.Add(new SqlParameter("@BytesFull", ResizeImageFile(BytesOriginal, 600)));
                command.Parameters.Add(new SqlParameter("@BytesPoster", ResizeImageFile(BytesOriginal, 198)));
                command.Parameters.Add(new SqlParameter("@BytesThumb", ResizeImageFile(BytesOriginal, 100)));
                connection.Open();
                command.ExecuteNonQuery();
            }
        }
    }
    //移除一张图片(指定图片ID)
    public static void RemovePhoto(int PhotoID)
    {
        using (SqlConnection connection = new SqlConnection(ConnString))
        {
            using (SqlCommand command = new SqlCommand("RemovePhoto", connection))
            {
                command.CommandType = CommandType.StoredProcedure;
                command.Parameters.Add(new SqlParameter("@PhotoID", PhotoID));
                connection.Open();
                command.ExecuteNonQuery();
            }
        }
    }
    //编辑图片(编辑后的标题与所编辑的图片ID)
    public static void EditPhoto(string Caption, int PhotoID)
    {
        using (SqlConnection connection = new SqlConnection(ConnString))
        {
            using (SqlCommand command = new SqlCommand("EditPhoto", connection))
            {
                command.CommandType = CommandType.StoredProcedure;
                command.Parameters.Add(new SqlParameter("@Caption", Caption));
                command.Parameters.Add(new SqlParameter("@PhotoID", PhotoID));
                connection.Open();
                command.ExecuteNonQuery();
            }
        }
    }
    // 获取相册(在相册页面中调用)
    public static List<Album> GetAlbums()
    {
        using (SqlConnection connection = new SqlConnection(ConnString))
        {
            using (SqlCommand command = new SqlCommand("GetAlbums", connection))
            {
                command.CommandType = CommandType.StoredProcedure;
                bool filter =
!(HttpContext.Current.User.IsInRole("Friends") ||
HttpContext.Current.User.IsInRole("Administrators"));
                command.Parameters.Add(new SqlParameter("@IsPublic", filter));
                connection.Open();
                List<Album> list = new List<Album>();
                using (SqlDataReader reader = command.ExecuteReader())
                {
                    while (reader.Read())
                    {
                        Album temp = new Album(
                            (int)reader["AlbumID"],
                            (int)reader["NumberOfPhotos"],
                            (string)reader["Caption"],
                            (bool)reader["IsPublic"]);
                        list.Add(temp);
                    }
                }
                return list;
            }
        }
    }
    //添加新相册(相册名与是否公开属性)
    public static void AddAlbum(string Caption, bool IsPublic)
    {
        using (SqlConnection connection = new SqlConnection(ConnString))
        {
            using (SqlCommand command = new SqlCommand("AddAlbum", connection))
            {
                command.CommandType = CommandType.StoredProcedure;
                command.Parameters.Add(new SqlParameter("@Caption", Caption));
                command.Parameters.Add(new SqlParameter("@IsPublic", IsPublic));
                connection.Open();
                command.ExecuteNonQuery();
            }
        }
    }
    //删除一个相册(删除一个相册时里面的所有照片也同时删除)
    public static void RemoveAlbum(int AlbumID)
    {
        using (SqlConnection connection = new SqlConnection(ConnString))
        {
            using (SqlCommand command = new SqlCommand("RemoveAlbum", connection))
            {
                command.CommandType = CommandType.StoredProcedure;
                command.Parameters.Add(new SqlParameter("@AlbumID", AlbumID));
                connection.Open();
                command.ExecuteNonQuery();
            }
        }
    }
    //编辑相册(编辑标量与公开属性,指定相册ID号)
    public static void EditAlbum(string Caption, bool IsPublic, int AlbumID)
    {
        using (SqlConnection connection = new SqlConnection(ConnString))
        {
            using (SqlCommand command = new SqlCommand("EditAlbum", connection))
            {
                command.CommandType = CommandType.StoredProcedure;
                command.Parameters.Add(new SqlParameter("@Caption", Caption));
                command.Parameters.Add(new SqlParameter("@IsPublic", IsPublic));
                command.Parameters.Add(new SqlParameter("@AlbumID", AlbumID));
                connection.Open();
                command.ExecuteNonQuery();
            }
        }
    }
    //获取随机相册号(1-最大相册号之间)
    public static int GetRandomAlbumID()
    {
        using (SqlConnection connection = new SqlConnection(ConnString))
        {
            using (SqlCommand command = new SqlCommand("GetNonEmptyAlbums", connection))
            {
                command.CommandType = CommandType.StoredProcedure;
                connection.Open();
                List<Album> list = new List<Album>();
                using (SqlDataReader reader = command.ExecuteReader())
                {
                    while (reader.Read())
                    {
                        Album temp = new Album((int)reader["AlbumID"], 0, "", false);
                        list.Add(temp);
                    }
                }
                try
                {
                    Random r = new Random();
                    return list[r.Next(list.Count)].AlbumID;
                }
                catch
                {
                    return -1;
                }
            }
        }
    }
    //指定图片大小,根据自定义而缩放图片
    private static byte[] ResizeImageFile(byte[] imageFile, int targetSize)
    {
        using (System.Drawing.Image oldImage = System.Drawing.Image.FromStream(new MemoryStream(imageFile)))
        {
            Size newSize = CalculateDimensions(oldImage.Size, targetSize);
            using (Bitmap newnewImage = new Bitmap(newSize.Width, newSize.Height, PixelFormat.Format24bppRgb))
            {
                using (Graphics canvas = Graphics.FromImage(newImage))
                {
                    canvas.SmoothingMode = SmoothingMode.AntiAlias;
                    canvas.InterpolationMode = InterpolationMode.HighQualityBicubic;
                    canvas.PixelOffsetMode = PixelOffsetMode.HighQuality;
                    canvas.DrawImage(oldImage, new Rectangle(new Point(0, 0), newSize));
                    MemoryStream m = new MemoryStream();
                    newImage.Save(m, ImageFormat.Jpeg);
                    return m.GetBuffer();
                }
            }
        }
    }
    private static Size CalculateDimensions(Size oldSize, int targetSize)
    {
        Size newnewSize = new Size();
        if (oldSize.Height > oldSize.Width)
        {
            newSize.Width = (int)(oldSize.Width * ((float)targetSize / (float)oldSize.Height));
            newSize.Height = targetSize;
        }
        else
        {
            newSize.Width = targetSize;
            newSize.Height = (int)(oldSize.Height * ((float)targetSize / (float)oldSize.Width));
        }
        return newSize;
    }
    //批量上传时给出upload文件夹中的所有图片,以列表的形式显示
    public static ICollection ListUploadDirectory()
    {
        DirectoryInfo d = new DirectoryInfo(System.Web.HttpContext.Current.Server.MapPath("~/Upload"));
        return d.GetFileSystemInfos("*.jpg");
    }
}