初始化版本

tongxin/NetWorkHelper/Helper/ImageHelper.cs

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+using System.Drawing;
+using System.Drawing.Imaging;
+using System.IO;
+
+namespace NetWorkHelper
+{
+    public static class ImageHelper
+    {
+        /// <summary>
+        /// Convert Image to Byte[]
+        /// </summary>
+        /// <param name="image"></param>
+        /// <returns></returns>
+        public static byte[] ImageToBytes(Image image)
+        {
+            ImageFormat format = image.RawFormat;
+            using (MemoryStream ms = new MemoryStream())
+            {
+                if (format.Equals(ImageFormat.Jpeg))
+                {
+                    image.Save(ms, ImageFormat.Jpeg);
+                }
+                else if (format.Equals(ImageFormat.Png))
+                {
+                    image.Save(ms, ImageFormat.Png);
+                }
+                else if (format.Equals(ImageFormat.Bmp))
+                {
+                    image.Save(ms, ImageFormat.Bmp);
+                }
+                else if (format.Equals(ImageFormat.Gif))
+                {
+                    image.Save(ms, ImageFormat.Gif);
+                }
+                else if (format.Equals(ImageFormat.Icon))
+                {
+                    image.Save(ms, ImageFormat.Icon);
+                }
+                byte[] buffer = new byte[ms.Length];
+                //Image.Save()会改变MemoryStream的Position，需要重新Seek到Begin
+                ms.Seek(0, SeekOrigin.Begin);
+                ms.Read(buffer, 0, buffer.Length);
+                return buffer;
+            }
+        }
+
+        /// <summary>
+        /// Convert Byte[] to Image
+        /// </summary>
+        /// <param name="buffer"></param>
+        /// <returns></returns>
+        public static Image BytesToImage(byte[] buffer)
+        {
+            MemoryStream ms = new MemoryStream(buffer);
+            Image image = System.Drawing.Image.FromStream(ms);
+            return image;
+        }
+
+        /// <summary>
+        /// Convert Byte[] to a picture and Store it in file
+        /// </summary>
+        /// <param name="fileName"></param>
+        /// <param name="buffer"></param>
+        /// <returns></returns>
+        public static string CreateImageFromBytes(string fileName, byte[] buffer)
+        {
+            string file = fileName;
+            Image image = BytesToImage(buffer);
+            ImageFormat format = image.RawFormat;
+            if (format.Equals(ImageFormat.Jpeg))
+            {
+                file += ".jpeg";
+            }
+            else if (format.Equals(ImageFormat.Png))
+            {
+                file += ".png";
+            }
+            else if (format.Equals(ImageFormat.Bmp))
+            {
+                file += ".bmp";
+            }
+            else if (format.Equals(ImageFormat.Gif))
+            {
+                file += ".gif";
+            }
+            else if (format.Equals(ImageFormat.Icon))
+            {
+                file += ".icon";
+            }
+            System.IO.FileInfo info = new System.IO.FileInfo(file);
+            System.IO.Directory.CreateDirectory(info.Directory.FullName);
+            File.WriteAllBytes(file, buffer);
+            return file;
+        }
+    }
+
+}