A:调整网卡激活逻辑

src/NetVizor.Backend/Shell/App.xaml.cs

@@ -924,19 +924,19 @@ public partial class App : System.Windows.Application
                             id = guid,
                             name = networkInfo.NetConnectionID ?? networkInfo.Name,
                             displayName = networkInfo.Description ?? networkInfo.Name,
-                            isActive = networkInfo.Status == "OK",
+                            isActive = true, // 因为在数据库中有流量数据，所以认为是可用的
                             macAddress = networkInfo.MACAddress
                         });
                     }
                     else
                     {
-                        // 如果无法获取网卡信息，使用基本信息
+                        // 如果无法获取网卡信息，但数据库中有流量数据，仍然认为是有效的
                         interfaces.Add(new
                         {
                             id = guid,
                             name = $"Network Interface {guid.Substring(0, 8)}",
                             displayName = $"Network Adapter {guid.Substring(0, 8)}",
-                            isActive = true,
+                            isActive = true, // 有流量数据就认为是可用的
                             macAddress = ""
                         });
                     }

src/NetVizor.Backend/Shell/Services/AppSpeedInfoService.cs

@@ -0,0 +1,168 @@
+using System.Text;
+using Common.Utils;
+using Shell.Models;
+using Utils.ETW.Etw;
+using Infrastructure.Models;
+
+namespace Shell.Services;
+
+/// <summary>
+/// 应用网速信息服务
+/// </summary>
+public class AppSpeedInfoService
+{
+    private static readonly Lazy<AppSpeedInfoService> _instance = new(() => new AppSpeedInfoService());
+    public static AppSpeedInfoService Instance => _instance.Value;
+
+    /// <summary>
+    /// 获取网速占用最高的应用程序列表
+    /// </summary>
+    /// <param name="count">返回的应用程序数量 (1-5)</param>
+    /// <returns>按总网速降序排列的应用程序列表</returns>
+    public List<AppSpeedInfo> GetTopSpeedApps(int count = 3)
+    {
+        count = Math.Max(1, Math.Min(5, count));
+        
+        try
+        {
+            // 从GlobalNetworkMonitor获取快照
+            var snapshot = GlobalNetworkMonitor.Instance.GetSnapshot();
+            
+            if (snapshot?.Applications == null || !snapshot.Applications.Any())
+            {
+                return new List<AppSpeedInfo>();
+            }
+
+            // 计算每个应用的网速，并按总速度排序
+            var topApps = snapshot.Applications
+                .Where(app => app.TotalSendSpeed > 0 || app.TotalReceiveSpeed > 0) // 只包含有网络活动的应用
+                .OrderByDescending(app => app.TotalSendSpeed + app.TotalReceiveSpeed) // 按总速度排序
+                .Take(count)
+                .Select(app => new AppSpeedInfo
+                {
+                    ProcessId = app.ProcessId,
+                    AppName = GetDisplayAppName(app),
+                    UploadSpeedBytes = app.TotalSendSpeed,
+                    DownloadSpeedBytes = app.TotalReceiveSpeed,
+                    UploadSpeed = FormatSpeed(app.TotalSendSpeed),
+                    DownloadSpeed = FormatSpeed(app.TotalReceiveSpeed),
+                    IconPath = GetAppIconPath(app)
+                })
+                .ToList();
+
+            return topApps;
+        }
+        catch (Exception ex)
+        {
+            // 记录错误但不抛出异常，返回空列表
+            Common.Logger.Log.Error4Ctx($"获取Top应用网速时出错: {ex.Message}");
+            return new List<AppSpeedInfo>();
+        }
+    }
+
+    /// <summary>
+    /// 获取应用程序的显示名称
+    /// </summary>
+    private string GetDisplayAppName(ApplicationSnapshot app)
+    {
+        // 优先使用程序信息中的产品名称
+        if (app.ProgramInfo?.ProductName != null && !string.IsNullOrEmpty(app.ProgramInfo.ProductName))
+        {
+            return app.ProgramInfo.ProductName;
+        }
+
+        // 如果没有产品名称，使用文件描述
+        if (app.ProgramInfo?.FileDescription != null && !string.IsNullOrEmpty(app.ProgramInfo.FileDescription))
+        {
+            return app.ProgramInfo.FileDescription;
+        }
+
+        // 如果没有程序信息，尝试从进程ID获取进程名
+        try
+        {
+            var process = System.Diagnostics.Process.GetProcessById(app.ProcessId);
+            return process.ProcessName;
+        }
+        catch
+        {
+            return $"Process {app.ProcessId}";
+        }
+    }
+
+    /// <summary>
+    /// 获取应用程序图标路径
+    /// </summary>
+    private string GetAppIconPath(ApplicationSnapshot app)
+    {
+        // 尝试从程序信息中获取图标Base64数据
+        if (app.ProgramInfo?.IconBase64 != null && !string.IsNullOrEmpty(app.ProgramInfo.IconBase64))
+        {
+            return app.ProgramInfo.IconBase64;
+        }
+
+        // 如果没有图标信息，返回null
+        return null;
+    }
+
+    /// <summary>
+    /// 格式化网速显示文本
+    /// </summary>
+    /// <param name="bytesPerSecond">字节/秒</param>
+    /// <returns>格式化的速度字符串</returns>
+    private string FormatSpeed(double bytesPerSecond)
+    {
+        if (bytesPerSecond <= 0)
+            return "0 B/s";
+
+        // 根据NetViewSettings中的单位设置来格式化
+        var settings = NetViewSettings.Instance;
+        
+        return settings.SpeedUnit switch
+        {
+            SpeedUnit.Bytes => $"{bytesPerSecond:F2} B/s",
+            SpeedUnit.KB => $"{bytesPerSecond / 1024:F2} KB/s",
+            SpeedUnit.MB => $"{bytesPerSecond / 1024 / 1024:F2} MB/s",
+            SpeedUnit.Auto => FormatSpeedAuto(bytesPerSecond),
+            _ => FormatSpeedAuto(bytesPerSecond)
+        };
+    }
+
+    /// <summary>
+    /// 自动选择最适合的单位格式化速度
+    /// </summary>
+    private string FormatSpeedAuto(double bytesPerSecond)
+    {
+        if (bytesPerSecond < 1024)
+            return $"{bytesPerSecond:F0} B/s";
+        
+        if (bytesPerSecond < 1024 * 1024)
+            return $"{bytesPerSecond / 1024:F2} KB/s";
+        
+        return $"{bytesPerSecond / 1024 / 1024:F2} MB/s";
+    }
+
+    /// <summary>
+    /// 获取格式化的速度信息摘要（用于调试）
+    /// </summary>
+    public string GetSpeedSummary(int count = 3)
+    {
+        var topApps = GetTopSpeedApps(count);
+        
+        if (!topApps.Any())
+        {
+            return "当前没有检测到网络活动的应用程序";
+        }
+
+        var sb = new StringBuilder();
+        sb.AppendLine($"Top {topApps.Count} 网速占用应用:");
+        
+        for (int i = 0; i < topApps.Count; i++)
+        {
+            var app = topApps[i];
+            sb.AppendLine($"{i + 1}. {app.AppName}");
+            sb.AppendLine($"   ↑ {app.UploadSpeed}  ↓ {app.DownloadSpeed}");
+        }
+
+        return sb.ToString();
+    }
+}