improve:自动更新

Ink Canvas/Helpers/AutoUpdateHelper.cs

@@ -528,7 +528,9 @@ namespace Ink_Canvas.Helpers
         {
             LogHelper.WriteLogToFile($"AutoUpdate | 正在尝试多线程下载: {fileUrl}");
             int maxRetry = 3;
-            int threadCount = 32;
+            int[] threadOptions = new int[] { 32, 4 };
+            foreach (int threadCount in threadOptions)
+            {
                 long totalSize = await GetContentLength(fileUrl);
                 if (totalSize <= 0)
                 {
@@ -537,8 +539,6 @@ namespace Ink_Canvas.Helpers
                 }
                 int blockSize = (int)Math.Ceiling((double)totalSize / threadCount);
                 int blockCount = (int)Math.Ceiling((double)totalSize / blockSize);
-
-            // 这里不再定义BlockTask类，直接使用
                 var blockQueue = new System.Collections.Concurrent.ConcurrentQueue<BlockTask>();
                 var finishedBlocks = new System.Collections.Concurrent.ConcurrentDictionary<int, bool>();
                 long[] blockDownloaded = new long[blockCount];
@@ -581,7 +581,7 @@ namespace Ink_Canvas.Helpers
                                                     // 合并所有块进度
                                                     long totalDownloaded = blockDownloaded.Sum();
                                                     double percent = (double)totalDownloaded / totalSize * 100;
-                                                progressCallback?.Invoke(percent, $"多线程下载中: {percent:F1}%");
+                                                    progressCallback?.Invoke(percent, $"多线程下载中({threadCount}线程): {percent:F1}%");
                                                 }
                                             }
                                         }
@@ -617,15 +617,25 @@ namespace Ink_Canvas.Helpers
                 await Task.WhenAll(tasks);
                 if (cts.IsCancellationRequested || finishedBlocks.Count != blockCount)
                 {
-                progressCallback?.Invoke(0, "多线程下载失败");
+                    progressCallback?.Invoke(0, $"多线程下载失败({threadCount}线程)");
                     // 清理分块文件
                     for (int i = 0; i < blockCount; i++)
                     {
                         string tempPath = destinationPath + $".part{i}";
                         if (File.Exists(tempPath)) File.Delete(tempPath);
                     }
+                    if (threadCount == threadOptions.Last())
+                    {
+                        // 已经是最后一次尝试
                         return false;
                     }
+                    else
+                    {
+                        LogHelper.WriteLogToFile($"AutoUpdate | {threadCount}线程下载失败，尝试降级为{threadOptions.Last()}线程");
+                        progressCallback?.Invoke(0, $"{threadCount}线程下载失败，尝试降级为{threadOptions.Last()}线程");
+                        continue;
+                    }
+                }
                 // 合并所有块
                 using (var output = new FileStream(destinationPath, FileMode.Create, FileAccess.Write, FileShare.None))
                 {
@@ -639,9 +649,12 @@ namespace Ink_Canvas.Helpers
                         File.Delete(tempPath);
                     }
                 }
-            progressCallback?.Invoke(100, "多线程下载完成");
+                progressCallback?.Invoke(100, $"多线程下载完成({threadCount}线程)");
                 return true;
             }
+            // 理论上不会到这里
+            return false;
+        }
 
         // 获取文件总大小
         private static async Task<long> GetContentLength(string fileUrl)