微信商品图片无法显示/上传问题优化（30%）

AllBase/ImageBuild.cs

@@ -5,7 +5,9 @@ using System.Drawing.Drawing2D;
 using System.Drawing.Imaging;
 using System.IO;
 using System.Linq;
+using System.Net;
 using System.Runtime.InteropServices;
+using System.Windows.Media.Imaging;
 
 namespace AllBase
 {
@@ -587,6 +589,89 @@ namespace AllBase
             fs.Close();
             return imgBytes;
         }
+
+        public static Image LoadBitmapLoadBitmipImageFromUrl(string url, out string error)
+        {
+            try
+            {
+                BitmapImage bi = LoadBitmipImageFromUrl(url, out error);
+                return BitmapImageToSystemDrawingImage(bi);
+            }
+            catch (Exception e)
+            {
+                error = e.Message;
+                return null;
+            }
+        }
+
+        public static Image BitmapImageToSystemDrawingImage(BitmapImage bitmapImage)
+        {
+            // 方法1 会乱码花屏
+            //int width = bitmapImage.PixelWidth;
+            //int height = bitmapImage.PixelHeight;
+            //int stride = width * ((bitmapImage.Format.BitsPerPixel + 7) / 8);
+
+            //byte[] pixels = new byte[stride * height];
+            //bitmapImage.CopyPixels(pixels, stride, 0);
+
+            //Bitmap bitmap = new Bitmap(width, height, PixelFormat.Format32bppArgb);
+            //BitmapData bmpData = bitmap.LockBits(new Rectangle(0, 0, width, height), ImageLockMode.WriteOnly, bitmap.PixelFormat);
+
+            //Marshal.Copy(pixels, 0, bmpData.Scan0, pixels.Length);
+            //bitmap.UnlockBits(bmpData);
+
+            //return bitmap;
+
+            // 方法2
+            using (MemoryStream stream = new MemoryStream())
+            {
+                BitmapEncoder encoder = new BmpBitmapEncoder();
+                encoder.Frames.Add(BitmapFrame.Create(bitmapImage));
+                encoder.Save(stream);
+                stream.Position = 0;
+                Bitmap bitmap = new Bitmap(stream);
+                stream.Close();
+
+                //// 现在你可以将这个Bitmap对象用于Windows Forms的PictureBox或其他图像显示控件
+                //PictureBox pictureBox = new PictureBox();
+                //pictureBox.Image = bitmap; // 或者如果你已经有了一个PictureBox控件，直接设置其Image属性
+                return bitmap;
+            }
+        }
+
+        public static BitmapImage LoadBitmipImageFromUrl(string url, out string error)
+        {
+            BitmapImage bitmap = new BitmapImage();
+            error = "";
+
+            try
+            {
+                using (WebClient webClient = new WebClient())
+                {
+                    // 下载图片数据到内存流
+                    using (MemoryStream stream = new MemoryStream(webClient.DownloadData(url)))
+                    {
+                        stream.Position = 0; // 重置流的位置到开始处
+                        bitmap.BeginInit();
+                        bitmap.CreateOptions = BitmapCreateOptions.PreservePixelFormat;
+                        bitmap.CacheOption = BitmapCacheOption.OnLoad; // 或者使用 BitmapCacheOption.OnLoad 以减少内存使用
+                        bitmap.UriSource = null; // 清除可能的旧UriSource，防止缓存问题
+                        bitmap.StreamSource = stream;
+                        bitmap.EndInit();
+                        bitmap.Freeze(); // 防止后续更改，提高性能
+                    }
+                }
+            }
+            catch (Exception ex)
+            {
+                // 处理异常，例如打印错误信息或设置一个默认图片等
+                //Console.WriteLine("Error loading image: " + ex.Message);
+                error = ex.Message;
+                return null;
+            }
+
+            return bitmap;
+        }
     }
     public class ImagePiex
     {