下载任务数并发控制（有一点点bug）

App.xaml.cs

@@ -25,9 +25,11 @@ namespace HeBianGu.App.Disk
     {
         public new static ComponentResourceKey Custom
         {
-            get => new ComponentResourceKey(typeof (LinkWindowBase), (object) "S.Window.Link.Custom");
+            get => new ComponentResourceKey(typeof(LinkWindowBase), (object)"S.Window.Link.Custom");
         }
-        public static ComponentResourceKey WaitingPercent => new ComponentResourceKey(typeof(ProgressBarKeys), "S.ProgressBar.Custom");
+
+        public static ComponentResourceKey WaitingPercent =>
+            new ComponentResourceKey(typeof(ProgressBarKeys), "S.ProgressBar.Custom");
 
         protected override MainWindowBase CreateMainWindow(StartupEventArgs e)
         {
@@ -137,11 +139,12 @@ namespace HeBianGu.App.Disk
             {
                 var tempSetting = new SystemSetting();
                 tempSetting.TaskCount = 3;
-                tempSetting.SyncDir = Path.Combine(SelectDrive(),"HopetryBoxData");
+                tempSetting.SyncDir = Path.Combine(SelectDrive(), "HopetryBoxData");
                 if (!Directory.Exists(tempSetting.SyncDir))
                 {
                     Directory.CreateDirectory(tempSetting.SyncDir);
                 }
+
                 xmlSerializerService.Save("./settings.xml", tempSetting);
             }
 
@@ -298,10 +301,24 @@ namespace HeBianGu.App.Disk
     }
 
 
-    
     [Displayer(Name = "下载设置", GroupName = "通用设置")]
     public class DownloadSetting : LazySettingInstance<DownloadSetting>
     {
+        private int _maxConcurrent;
+
+        [DefaultValue(3)]
+        [Display(Name = "下载并行任务数")]
+        public int MaxConcurrent
+        {
+            get => _maxConcurrent;
+            set
+            {
+                if (_maxConcurrent == value) return;
+                _maxConcurrent = value;
+                RaisePropertyChanged();
+            }
+        }
+
         private string _downDir;
 
         [Display(Name = "下载目录")]
@@ -315,6 +332,7 @@ namespace HeBianGu.App.Disk
                 RaisePropertyChanged();
             }
         }
+
         private bool _isSelect;
 
         [DefaultValue(false)]

Services/MinioService.cs

@@ -433,7 +433,7 @@ namespace Hopetry.Services
             //var localPath = Path.Combine(filePath, objectKey.Replace('/', Path.DirectorySeparatorChar));
             var localPath = Path.Combine(filePath,
                 objectKey[(objectKey.LastIndexOf('/') + 1)..]);
-            GetObjectArgs getObjectArgs = new GetObjectArgs()
+            var getObjectArgs = new GetObjectArgs()
                 .WithBucket(string.IsNullOrEmpty(bucketName) ? _bucketName : bucketName)
                 .WithObject(objectKey)
                 .WithOffsetAndLength(offset, totalBytes - offset)
@@ -477,7 +477,6 @@ namespace Hopetry.Services
                                 }
                             }
 
-
                             fileStream.Close();
                         }
 

ViewModel/Send/DownViewModel.cs

@@ -6,6 +6,7 @@ using System.IO;
 using System.Windows;
 using System.Windows.Data;
 using System.Windows.Input;
+using HeBianGu.App.Disk;
 using HeBianGu.Base.WpfBase;
 using HeBianGu.Service.Mvc;
 using Hopetry.Models;
@@ -155,7 +156,7 @@ public class DownViewModel : MvcViewModelBase
         }
     }
 
-    private int _maxConcurrent = 3;
+    private int _maxConcurrent;
 
     public int MaxConcurrent
     {
@@ -164,9 +165,9 @@ public class DownViewModel : MvcViewModelBase
         {
             if (value < 1) value = 1;
             if (_maxConcurrent == value) return;
-
+            var delta = value - _maxConcurrent;
             _maxConcurrent = value;
-            //AdjustConcurrency();
+            AdjustConcurrency(delta);
             RaisePropertyChanged();
         }
     }
@@ -204,8 +205,16 @@ public class DownViewModel : MvcViewModelBase
         // 加载未完成任务
         LoadRunningTasks();
         ClearFinishedCommand = new CustomCommand(DoClearFinishedCommand);
+
+        Console.WriteLine($"初始下载任务并发数：{DownloadSetting.Instance.MaxConcurrent}");
         // 启动任务处理线程
-        _semaphore = new SemaphoreSlim(MaxConcurrent);
+        _maxConcurrent = DownloadSetting.Instance.MaxConcurrent;
+        _semaphore = new SemaphoreSlim(DownloadSetting.Instance.MaxConcurrent);
+        DownloadSetting.Instance.PropertyChanged += (sender, args) =>
+        {
+            Console.WriteLine($"当前下载任务并发数：{DownloadSetting.Instance.MaxConcurrent}");
+            MaxConcurrent = DownloadSetting.Instance.MaxConcurrent;
+        };
         new Thread(ProcessTasksLoop) { IsBackground = true }.Start();
     }
 
@@ -291,7 +300,7 @@ public class DownViewModel : MvcViewModelBase
     public void RefreshHeader()
     {
         RunningTaskHeader = $"下载中（{RunningTasks.Count}）";
-        ViewModelLocator.SendViewModel.DownLinkAction.DisplayName = $"下载 {RunningTasks.Count}" ;
+        ViewModelLocator.SendViewModel.DownLinkAction.DisplayName = $"下载 {RunningTasks.Count}";
         FinishedTaskHeader = $"已完成（{FinishedTasks.Count}）";
     }
 
@@ -428,22 +437,43 @@ public class DownViewModel : MvcViewModelBase
         }
     }
 
-    private void AdjustConcurrency()
+    private void AdjustConcurrency(int delta)
     {
+        Console.WriteLine("AdjustConcurrency 被调用了");
         lock (_semaphore)
         {
             // 调整信号量容量
-            var delta = _maxConcurrent - _semaphore.CurrentCount;
             if (delta > 0)
             {
-                for (int i = 0; i < delta; i++)
+                _semaphore.Release(delta);
+            }
+            else
+            {
+                // todo 
+                var runTask = _runningTasks.Where(task => task is { Status: "下载中", StopDownTs: not null });
+                var num = -delta;
+                foreach (var item in runTask)
                 {
-                    _semaphore.Release();
+
+                    _semaphore.WaitAsync();
+                    item.StopDownTs.Cancel();
+                    item.Status = "等待中";
+                    // 速度及剩余时间（视图显示信息）
+                    item.Speed = "等待中";
+                    _taskQueue.Enqueue(item);
+                    if (num-- == 1)
+                    {
+                        break;
+                    }
                 }
             }
         }
     }
 
+    /// <summary>
+    ///  打开文件夹
+    /// </summary>
+    /// <param name="para"></param>
     public void DoOpenDownItemFolder(MinioDownloadTask para)
     {
         switch (para.Type)
@@ -473,6 +503,10 @@ public class DownViewModel : MvcViewModelBase
         }
     }
 
+    /// <summary>
+    /// 任务取消
+    /// </summary>
+    /// <param name="item"></param>
     public void DoCancelDownload(MinioDownloadTask item)
     {
         Console.WriteLine("取消下载");
@@ -484,6 +518,7 @@ public class DownViewModel : MvcViewModelBase
         }
 
         item.Status = "删除中";
+        item.Speed = "删除中";
         using var client = SqlSugarConfig.GetSqlSugarScope();
         client.Deleteable<MinioDownloadTask>().Where(x => x.TaskId == item.TaskId).ExecuteCommand();
         RunningTasks.Remove(item);