初始化 monorepo: Go后端(7微服务) + Unity客户端(9模块) + 启动器 HTML5原型: Three.js 3D体素世界, Perlin噪声地形, 原版材质, 22种方块 Minecraft创造模式背包: 双栏布局, 拖拽移动物品, 方向性元件引脚 AI助搭策划文档 + 客户端/服务端骨架 + Docker Compose + CI
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using System.Collections.Concurrent;
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using System.IO;
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using System.Net;
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using System.Net.Http;
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using System.Windows;
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using System.Windows.Controls;
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using System.Windows.Media;
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using PCL.Core.Utils;
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using PCL.Core.IO.Net.Http;
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namespace PCL;
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public class MyImage : Image
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{
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public MyImage()
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{
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Initialized += (_, _) => Load();
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SizeChanged += (_, _) => UpdateClip();
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}
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/// <summary>
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/// 实际被呈现的图片地址。
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/// </summary>
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public string ActualSource
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{
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get => field;
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set
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{
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if (string.IsNullOrEmpty(value))
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value = null;
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if ((field ?? "") == (value ?? ""))
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return;
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field = value;
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Dispatcher.BeginInvoke(new Func<Task>(async () =>
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{
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try
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{
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ImageSource bitmap = value is null ? null : await Task.Run(() => new MyBitmap(value));
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base.Source = bitmap;
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}
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catch (Exception ex)
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{
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ModBase.Log(ex, $"加载图片失败（{value}）");
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try
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{
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if (value.StartsWithF(ModBase.pathTemp) && File.Exists(value)) File.Delete(value);
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}
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catch
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{
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}
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}
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})); // 在这里先触发可能的文件读取，尽量避免在 UI 线程中读取文件
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// ignored
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}
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}
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private void Load() // 属性读取顺序修正：在完成 XAML 属性读取后再触发图片加载（#4868）
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{
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if (Source is null)
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{
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ActualSource = null;
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return;
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}
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if (!Source.StartsWithF("http"))
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{
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ActualSource = Source;
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return;
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}
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var url = Source;
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var tempPath = GetTempPath(url);
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var tempFile = new FileInfo(tempPath);
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var enableCache = this.EnableCache;
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if (enableCache && tempFile.Exists)
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{
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ActualSource = tempPath;
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if (DateTime.Now - tempFile.LastWriteTime < fileCacheExpiredTime)
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return; // 无需刷新缓存
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}
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Dispatcher.BeginInvoke(new Func<Task>(async () =>
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{
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try
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{
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// 下载
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ActualSource = LoadingSource;
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var resp = await DownloadImageAsync(url);
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if (!string.IsNullOrEmpty(resp))
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{
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ActualSource = resp;
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return;
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}
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resp = await DownloadImageAsync(FallbackSource);
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if (!string.IsNullOrEmpty(resp))
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{
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ActualSource = resp;
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return;
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}
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}
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catch (Exception ex)
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{
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// 更换备用地址
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ModBase.Log(ex, $"Online image get fail（source = {url}, fallback = {FallbackSource}）", ModBase.LogLevel.Developer);
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tempPath = GetTempPath(url);
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tempFile = new FileInfo(tempPath);
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if (enableCache && tempFile.Exists)
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{
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ActualSource = tempPath;
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if (DateTime.Now - tempFile.LastWriteTime < fileCacheExpiredTime)
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return;
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}
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}
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}));
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}
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public static Task<string> DownloadImageAsync(string url)
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{
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return _downloadTasks.GetOrAdd(url, key =>
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{
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var t = DownloadImageInternalAsync(key);
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t.ContinueWith(_ => _downloadTasks.TryRemove(url, out _));
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return t;
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});
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}
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public static string GetTempPath(string url)
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{
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return Path.Combine(ModBase.pathTemp, "Cache", "Images", $"{ModBase.GetStringMD5(url)}.png");
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}
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private static readonly ConcurrentDictionary<string, Task<string>> _downloadTasks = new();
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private static async Task<string> DownloadImageInternalAsync(string url)
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{
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var tempPath = GetTempPath(url);
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var tempDownloadingPath = tempPath + RandomUtils.NextInt(0, 1000000);
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try
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{
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Directory.CreateDirectory(ModBase.GetPathFromFullPath(tempPath)); // 重新实现下载，以避免携带 Header（#5072）
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using (var fs = new FileStream(tempDownloadingPath, FileMode.Create, FileAccess.ReadWrite, FileShare.Read))
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{
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using (var response = await HttpRequest.Create(url)
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.SendAsync(addMetedata: false))
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{
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response.EnsureSuccessStatusCode();
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using (var nfs = await response.AsStreamAsync())
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{
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fs.SetLength(0L);
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await nfs.CopyToAsync(fs);
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}
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}
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}
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File.Move(tempDownloadingPath, tempPath, true);
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return tempPath;
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}
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catch (Exception ex)
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{
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if (File.Exists(tempPath)) File.Delete(tempPath);
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if (File.Exists(tempDownloadingPath)) File.Delete(tempDownloadingPath);
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ModBase.Log(ex, $"Try to get online image fail (url = {url}, dest = {tempPath})");
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return string.Empty;
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}
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}
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#region 公开属性
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public TimeSpan fileCacheExpiredTime = TimeSpan.FromDays(14d);
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public bool EnableCache
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{
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get => (bool)GetValue(EnableCacheProperty);
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set => SetValue(EnableCacheProperty, value);
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}
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public new static readonly DependencyProperty EnableCacheProperty =
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DependencyProperty.Register("EnableCache", typeof(bool), typeof(MyImage), new PropertyMetadata(true));
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/// <summary>
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/// 与 Image 的 Source 类似。
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/// 若输入以 http 开头的字符串，则会尝试下载图片然后显示，图片会保存为本地缓存。
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/// 支持 WebP 格式的图片。
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/// </summary>
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public new string Source // 覆写 Image 的 Source 属性
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{
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get => field;
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set
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{
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if (string.IsNullOrEmpty(value))
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value = null;
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if ((field ?? "") == (value ?? ""))
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return;
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field = value;
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if (!IsInitialized)
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return; // 属性读取顺序修正：在完成 XAML 属性读取后再触发图片加载（#4868）
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Load();
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}
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} = "";
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public new static readonly DependencyProperty SourceProperty = DependencyProperty.Register("Source", typeof(string),
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typeof(MyImage), new PropertyMetadata((sender, e) =>
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{
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if (sender is not null) ((MyImage)sender).Source = e.NewValue.ToString();
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}));
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/// <summary>
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/// 当 Source 首次下载失败时，会从该备用地址加载图片。
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/// </summary>
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public string FallbackSource { get; set; }
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/// <summary>
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/// 正在下载网络图片时显示的本地图片。
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/// </summary>
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public string LoadingSource { get; set; } = "pack://application:,,,/images/Icons/NoIcon.png";
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public CornerRadius CornerRadius
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{
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get => (CornerRadius)GetValue(CornerRadiusProperty);
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set => SetValue(CornerRadiusProperty, value);
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}
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private static readonly DependencyProperty CornerRadiusProperty =
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DependencyProperty.Register(
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"CornerRadius",
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typeof(CornerRadius),
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typeof(MyImage),
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new FrameworkPropertyMetadata(
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new CornerRadius(-1),
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OnCornerRadiusChanged)
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);
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private static void OnCornerRadiusChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
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{
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((MyImage)d).UpdateClip();
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}
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private void UpdateClip() // Handles Me.SizeChanged will be added separately
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{
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if (ActualWidth > 0 && ActualHeight > 0 &&
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CornerRadius.TopLeft >= 0 && CornerRadius.TopRight >= 0)
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{
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Clip = new RectangleGeometry(
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new Rect(0, 0, ActualWidth, ActualHeight),
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CornerRadius.TopLeft,
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CornerRadius.TopRight);
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}
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}
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#endregion
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}
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