实时返回速度测试

IRaCIS.Core.API/Controllers/UploadDownLoadController.cs

@@ -916,12 +916,29 @@ namespace IRaCIS.Core.API.Controllers
             var notifyInterval = TimeSpan.FromSeconds(1);
             var lastNotify = DateTime.UtcNow;
 
+            // 用于计算下载速度
+            long lastReceivedSize = 0;
+            DateTime lastSpeedCheck = DateTime.UtcNow;
 
             async Task NotifyProgressAsync(bool force = false)
             {
-                if (!force && DateTime.UtcNow - lastNotify < notifyInterval)
+
+                var now = DateTime.UtcNow;
+                var elapsedSeconds = (now - lastSpeedCheck).TotalSeconds;
+
+                // 如果没有强制推送，并且未到推送间隔，则返回
+                if (!force && elapsedSeconds < notifyInterval.TotalSeconds)
                     return;
 
+                // 计算下载速度（字节/秒）
+                double speedBps = 0;
+                if (elapsedSeconds > 0)
+                {
+                    speedBps = (receivedSize - lastReceivedSize) / elapsedSeconds;
+                }
+
+                lastSpeedCheck = now;
+                lastReceivedSize = receivedSize;
                 lastNotify = DateTime.UtcNow;
 
                 var progress = new
@@ -932,7 +949,11 @@ namespace IRaCIS.Core.API.Controllers
 
                       SizePercent = totalSize > 0
                         ? Math.Round(receivedSize * 100m / totalSize, 2).ToString() + "%"
-                        : "0%"
+                        : "0%",
+
+                    Speed = (speedBps / 1024 >= 1024
+                        ? (speedBps / 1024 / 1024).ToString("0.00") + " MB/s"
+                        : (speedBps / 1024).ToString("0.00") + " KB/s")
                 };
 
                 // 不阻塞下载流程