81 lines
3.0 KiB
C#
81 lines
3.0 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Globalization;
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using System.IO;
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using System.Linq;
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using System.Net;
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using System.Text;
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using System.Threading.Tasks;
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using System.Windows.Data;
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using System.Windows.Media.Imaging;
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using Work;
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namespace _29WxOrderWpf.Converters
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{
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public class ImageUrlToBitmapImageConverter : IValueConverter
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{
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public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
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{
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if (value is string url && Uri.IsWellFormedUriString(url, UriKind.Absolute))
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{
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try
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{
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// 直接加载绑定如果遇到有问题的网络图片会直接崩溃。
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//var bitMap = new BitmapImage(new Uri(url));
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BitmapImage bitMap = null;
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//bitMap = LoadImageFromUrl(url + "?imageView2/1/w/100/format/webp|imageMogr2/auto-orient=");
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bitMap = LoadImageFromUrl(url);
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return bitMap;
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//string errStr = "";
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//var bitmapImg = GetUrlImg(url, out errStr);
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//return bitmapImg;
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}
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catch
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{
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}
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//return Task.Run(() => new BitmapImage(new Uri(url))); // 使用 Task.Run 来异步加载图片。
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}
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return null;
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}
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public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
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{
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throw new NotImplementedException(); // 不需要反向转换，所以不实现。
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}
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public static BitmapImage LoadImageFromUrl(string url)
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{
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BitmapImage bitmap = new BitmapImage();
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try
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{
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using (WebClient webClient = new WebClient())
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{
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// 下载图片数据到内存流
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using (MemoryStream stream = new MemoryStream(webClient.DownloadData(url)))
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{
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stream.Position = 0; // 重置流的位置到开始处
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bitmap.BeginInit();
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bitmap.CreateOptions = BitmapCreateOptions.PreservePixelFormat;
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bitmap.CacheOption = BitmapCacheOption.OnLoad; // 或者使用 BitmapCacheOption.OnLoad 以减少内存使用
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bitmap.UriSource = null; // 清除可能的旧UriSource，防止缓存问题
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bitmap.StreamSource = stream;
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bitmap.EndInit();
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bitmap.Freeze(); // 防止后续更改，提高性能
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}
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}
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}
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catch (Exception ex)
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{
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// 处理异常，例如打印错误信息或设置一个默认图片等
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//Console.WriteLine("Error loading image: " + ex.Message);
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return null;
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}
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return bitmap;
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}
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}
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}
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