优化图片显示

29WxOrderWpf/Ctrls/OrderCtrls/OrderListRowItemCtrl.xaml.cs

@@ -769,7 +769,7 @@ namespace _29WxOrderWpf.Ctrls.OrderCtrls
 			}
 		}
 
-		private void UserControl_DataContextChanged(object sender, DependencyPropertyChangedEventArgs e)
+		private async void UserControl_DataContextChanged(object sender, DependencyPropertyChangedEventArgs e)
 		{
 			if (this.DataContext is oms_wei_order_item_info order_item)
 			{
@@ -782,19 +782,22 @@ namespace _29WxOrderWpf.Ctrls.OrderCtrls
 				// 绑定时即刻生效，无需再次手动调用
 				//order_item.UpdateOrderItemBuyButton();
 
-				Task.Run(() =>
-				{
-					// 异步加载图片防止卡顿
-					// 缩略图在有的电脑上无法显示
-					//BitmapImage bImg = ImageUrlToBitmapImageConverter.LoadImageFromUrl(order_item.thumb_img + "?imageView2/1/w/100/format/webp|imageMogr2/auto-orient=");
-					BitmapImage bImg = AllBase.ImageBuild.LoadBitmipImageFromUrl(order_item.thumb_img, 100, 100);
-					//BitmapImage bImg = AllBase.ImageBuild.LoadBitmipImageFromUrl(order_item.thumb_img);
-					Thread.Sleep(Randomx.GetId(1000));
-					Dispatcher.Invoke(new Action(() =>
-					{
-						imgOrderItem.Source = bImg;
-					}));
-				});
+				//Task.Run(() =>
+				//{
+				//	// 异步加载图片防止卡顿
+				//	// 缩略图在有的电脑上无法显示
+				//	//BitmapImage bImg = ImageUrlToBitmapImageConverter.LoadImageFromUrl(order_item.thumb_img + "?imageView2/1/w/100/format/webp|imageMogr2/auto-orient=");
+				//	BitmapImage bImg = AllBase.ImageBuild.LoadBitmipImageFromUrl(order_item.thumb_img, 100, 100);
+				//	//BitmapImage bImg = AllBase.ImageBuild.LoadBitmipImageFromUrl(order_item.thumb_img);
+				//	Thread.Sleep(Randomx.GetId(1000));
+				//	Dispatcher.Invoke(new Action(() =>
+				//	{
+				//		imgOrderItem.Source = bImg;
+				//	}));
+				//});
+
+				var bImg = await AllBase.ImageBuild.LoadBitmipImageFromUrlAsync(order_item.thumb_img + "?imageView2/1/w/100/format/webp|imageMogr2/auto-orient=");
+				imgOrderItem.Source = bImg;
 
 
 				// 待采购不显示所有采购信息状态（否则会显示作废订单状态）

AllBase/29WxOrderAllBase.csproj

@@ -46,6 +46,7 @@
 		<!-- Framework assemblies not already implied by UseWindowsForms/UseWPF -->
 		<Reference Include="System.Data" />
 		<Reference Include="System.Management" />
+		<Reference Include="System.Net.Http" />
 		<Reference Include="System.Web.Services" />
 	</ItemGroup>
 

AllBase/ImageBuild.cs

@@ -1,11 +1,14 @@
-using System;
+using CefSharp.DevTools.IO;
+using System;
 using System.Drawing;
 using System.Drawing.Drawing2D;
 using System.Drawing.Imaging;
 using System.IO;
 using System.Net;
+using System.Net.Http;
 using System.Runtime.InteropServices;
 using System.Threading;
+using System.Threading.Tasks;
 using System.Windows.Forms;
 using System.Windows.Media.Imaging;
 
@@ -423,6 +426,85 @@ namespace AllBase
             return bitmap;
         }
 
+		public static async Task<BitmapImage> LoadBitmipImageFromUrlAsync(string url, int? width = null, int? height = null)
+		{
+			BitmapImage bitmap = new BitmapImage();
+
+			try
+			{
+				//using (WebClient webClient = new WebClient())
+				//{
+					//webClient.DownloadDataCompleted += (sender, e) =>
+					//{
+					//	if (e.Cancelled)
+					//	{
+					//		//Console.WriteLine("下载已取消");
+					//		bitmap = null;
+					//	}
+					//	else if (e.Error != null)
+					//	{
+					//		//Console.WriteLine("下载出错: " + e.Error.Message);
+					//		bitmap = null;
+					//	}
+					//	else
+					//	{
+					//		byte[] data = (byte[])e.Result;
+					//		//string text = System.Text.Encoding.UTF8.GetString(data);
+					//		//Console.WriteLine(text);
+
+					//		// 下载图片数据到内存流
+					//		using (MemoryStream stream = new MemoryStream(data))
+					//		{
+					//			stream.Position = 0; // 重置流的位置到开始处
+					//			bitmap.BeginInit();
+					//			if (width != null && height != null)
+					//			{
+					//				bitmap.DecodePixelWidth = width.Value;
+					//				bitmap.DecodePixelHeight = height.Value;
+					//			}
+					//			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
+					//		}
+					//	}
+					//};
+					//await webClient.DownloadDataAsync(new Uri(url));
+				//}
+
+				using (HttpClient client = new HttpClient())
+				{
+					// 下载图片数据到内存流
+					using (MemoryStream stream = new MemoryStream(await client.GetByteArrayAsync(url)))
+					{
+						stream.Position = 0; // 重置流的位置到开始处
+						bitmap.BeginInit();
+						if (width != null && height != null)
+						{
+							bitmap.DecodePixelWidth = width.Value;
+							bitmap.DecodePixelHeight = height.Value;
+						}
+						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);
+                return null;
+            }
+
+            return bitmap;
+        }
+
 
         //public string BitmapImageToBase64(BitmapImage bitmapImage)
         //{