block

AIStudio.Wpf.DiagramDesigner/Helpers/BitmapHelper.cs

@@ -192,5 +192,46 @@ namespace AIStudio.Wpf.DiagramDesigner
             }
         }
 
+        public static string ToBase64String(this BitmapImage bitmap)
+        {
+            byte[] bytearray = null;
+            Stream smarket = bitmap.StreamSource;
+            if (smarket != null && smarket.Length > 0)
+            {
+                //设置当前位置
+                smarket.Position = 0;
+                using (BinaryReader br = new BinaryReader(smarket))
+                {
+                    bytearray = br.ReadBytes((int)smarket.Length);
+                }
+            }
+            return Convert.ToBase64String(bytearray);
+        }
+
+        public static BitmapImage ToBitmapImage(this string base64String, int width = 0, int height =0)
+        {
+            if (string.IsNullOrEmpty(base64String))
+                return null;
+
+            try
+            {
+                var byteArray = Convert.FromBase64String(base64String);
+                BitmapImage bitmapImage = null;
+                bitmapImage = new BitmapImage();
+                bitmapImage.BeginInit();
+                bitmapImage.CreateOptions = BitmapCreateOptions.IgnoreColorProfile;
+                bitmapImage.CacheOption = BitmapCacheOption.OnLoad;
+                bitmapImage.DecodePixelWidth = width;//需要缩略图的解码宽度
+                bitmapImage.DecodePixelHeight = height;//缩略图的解码高度
+                bitmapImage.StreamSource = new MemoryStream(byteArray);
+                bitmapImage.EndInit();
+
+                return bitmapImage;
+            }
+            catch
+            {
+                return null;
+            }
+        }
     }
 }