提高代码质量

AppCard.cs

@@ -59,28 +59,53 @@ namespace AppStore
                 InitializeBorder();
             });
 
-            // 应用图标
-            iconBox = new PictureBox();
+            // 应用图标 - 添加null检查
+            if (iconBox != null && this != null && this.Controls != null)
+            {
                 iconBox.Size = new Size(80, 80);
                 iconBox.Location = new Point((Width - 80) / 2, 15);
                 iconBox.SizeMode = PictureBoxSizeMode.StretchImage;
                 this.Controls.Add(iconBox);
+            }
+            else
+            {
+                Logger.LogWarning("iconBox或Controls为null");
+            }
 
             // 应用名称 - 使用Panel包裹Label实现边框颜色
-            // namePanel已在构造函数中初始化
+            if (namePanel != null)
+            {
                 namePanel.Size = new Size(Width - 20, 40);
                 namePanel.Location = new Point(10, 100);
                 namePanel.Paint += (sender, e) => {
-                ControlPaint.DrawBorder(e.Graphics, namePanel.ClientRectangle, 
+                    try
+                    {
+                        if (e != null && e.Graphics != null && namePanel != null)
+                        {
+                            var rect = namePanel.ClientRectangle;
+                            if (rect.Width > 0 && rect.Height > 0)
+                            {
+                                ControlPaint.DrawBorder(e.Graphics, rect, 
                                     borderColor, ButtonBorderStyle.Solid);
+                            }
+                        }
+                    }
+                    catch (Exception ex)
+                    {
+                        Logger.LogWarning($"绘制namePanel边框失败: {ex.Message}");
+                    }
                 };
+            }
             
             nameLabel = new Label();
             nameLabel.Dock = DockStyle.Fill;
             nameLabel.Font = new Font("Microsoft YaHei", 10, FontStyle.Bold);
             nameLabel.TextAlign = ContentAlignment.MiddleCenter;
             
+            if (namePanel != null && nameLabel != null)
+            {
                 namePanel.Controls.Add(nameLabel);
+            }
             
             // 初始主题设置
             UpdateLabelTheme();
@@ -88,10 +113,14 @@ namespace AppStore
             // 订阅主题变化事件
             ThemeManager.ThemeChanged += (theme) => UpdateLabelTheme();
             
+            if (this != null && this.Controls != null && namePanel != null)
+            {
                 this.Controls.Add(namePanel);
+            }
 
-            // 下载按钮
-            downloadBtn = new Button();
+            // 下载按钮 - 添加null检查
+            if (downloadBtn != null)
+            {
                 downloadBtn.Text = "下载";
                 downloadBtn.Size = new Size(100, 32);
                 downloadBtn.Location = new Point((Width - 100) / 2, 150);
@@ -102,19 +131,26 @@ namespace AppStore
                 downloadBtn.Cursor = Cursors.Hand;
                 downloadBtn.Font = new Font("Microsoft YaHei", 9);
                 
-            // 按钮悬停效果
+                // 按钮悬停效果 - 添加null检查
                 downloadBtn.MouseEnter += (s, e) => {
+                    if (downloadBtn != null)
+                    {
                         downloadBtn.BackColor = Color.FromArgb(0, 150, 255);
+                    }
                 };
                 
                 downloadBtn.MouseLeave += (s, e) => {
+                    if (downloadBtn != null)
+                    {
                         downloadBtn.BackColor = Color.FromArgb(0, 120, 215);
+                    }
                 };
                 
                 downloadBtn.Click += DownloadBtn_Click;
                 this.Controls.Add(downloadBtn);
                 downloadBtn.Visible = ShowDownloadButton;
             }
+        }
 
         private void UpdateLabelTheme()
         {
@@ -132,8 +168,15 @@ namespace AppStore
                 namePanel.BackColor = Color.White;
                 borderColor = SystemColors.ControlDark;
             }
+            if (namePanel != null && !namePanel.IsDisposed)
+            {
                 namePanel.Invalidate(); // 触发重绘
             }
+            else
+            {
+                Logger.LogWarning("namePanel为null或已释放");
+            }
+        }
 
         /// <summary>
         /// 初始化卡片边框路径
@@ -262,11 +305,19 @@ namespace AppStore
                     };
 
                     // 启动C++程序计算路径
-                    using (var process = Process.Start(startInfo)) {
+                    if (startInfo != null)
+                    {
+                        using (var process = Process.Start(startInfo)) 
+                        {
+                            if (process != null)
+                            {
                                 process.WaitForExit();
                                 
                                 // 检查计算结果
-                        if (process.ExitCode == 0 && File.Exists(tempFile)) {
+                                if (process.ExitCode == 0 && File.Exists(tempFile)) 
+                                {
+                                    try
+                                    {
                                         // 读取生成的路径点
                                         var lines = File.ReadAllLines(tempFile);
                                         PointF[] points = lines.Select(line => {
@@ -279,6 +330,13 @@ namespace AppStore
                                         path.AddLines(points);
                                         PathCache.TryAdd(cacheKey, path);
                                     }
+                                    catch (Exception ex)
+                                    {
+                                        Logger.LogWarning($"读取路径点失败: {ex.Message}");
+                                    }
+                                }
+                            }
+                        }
                     }
                 } catch {
                     // C++程序失败时使用C#回退方案
@@ -353,10 +411,14 @@ namespace AppStore
 
         public void UpdateDisplay()
         {
-            if (nameLabel != null)
+            if (nameLabel != null && AppName != null)
             {
                 nameLabel.Text = AppName;
             }
+            else
+            {
+                Logger.LogWarning("nameLabel或AppName为null");
+            }
             if (iconBox != null && AppIcon != null)
             {
                 iconBox.Image = AppIcon;
@@ -370,14 +432,15 @@ namespace AppStore
                 // 更严格的null检查
                 // 更严格的null检查，包括DownloadManager.Instance和其方法
                 // 全面的null和状态检查
+                var downloadManager = DownloadManager.Instance;
                 if (sender == null || e == null || 
                     string.IsNullOrWhiteSpace(DownloadUrl) || 
                     string.IsNullOrWhiteSpace(AppName) ||
                     !this.IsHandleCreated ||
                     this.IsDisposed ||
-                    DownloadManager.Instance == null ||
-                    DownloadManager.Instance.DownloadItems == null ||
-                    DownloadManager.Instance.StartDownload == null)
+                    downloadManager == null ||
+                    downloadManager.DownloadItems == null ||
+                    downloadManager.StartDownload == null)
                 {
                     return;
                 }
@@ -385,7 +448,7 @@ namespace AppStore
                 string safeAppName = AppName ?? "未知应用";
                 string fileName = $"{safeAppName.Replace(" ", "_")}.exe";
                 
-                DownloadManager.Instance.StartDownload(fileName, DownloadUrl);
+                downloadManager.StartDownload(fileName, DownloadUrl);
                 
                 string message = $"已开始下载: {safeAppName}";
                 this.Invoke((MethodInvoker)delegate {

DownloadManager.cs

@@ -455,12 +455,16 @@ namespace AppStore
                 var downloadsFolderGuid = new Guid("374DE290-123F-4565-9164-39C4925E467B");
                 if (SHGetKnownFolderPath(downloadsFolderGuid, 0, IntPtr.Zero, out pathPtr) == 0)
                 {
-                    string defaultPath = Marshal.PtrToStringUni(pathPtr);
+                    string? defaultPath = Marshal.PtrToStringUni(pathPtr);
                     if (!string.IsNullOrEmpty(defaultPath))
                     {
                         Directory.CreateDirectory(defaultPath);
                         return defaultPath;
                     }
+                    else
+                    {
+                        Logger.LogWarning("获取到的系统下载路径为空");
+                    }
                 }
             }
             catch (Exception ex)
@@ -477,16 +481,19 @@ namespace AppStore
 
             // 3. 最终回退到相对路径 ~/Downloads
             string relativePath = "~/Downloads";
-            string fallbackPath = relativePath.Replace("~", 
-                Environment.GetFolderPath(Environment.SpecialFolder.UserProfile));
+            string userProfile = Environment.GetFolderPath(Environment.SpecialFolder.UserProfile) ?? string.Empty;
+            string fallbackPath = relativePath.Replace("~", userProfile);
             fallbackPath = Path.GetFullPath(fallbackPath);
             
             try {
                 Directory.CreateDirectory(fallbackPath);
                 // 测试路径可写性
                 string testFile = Path.Combine(fallbackPath, "write_test.tmp");
+                if (!string.IsNullOrEmpty(testFile))
+                {
                     File.WriteAllText(testFile, "test");
                     File.Delete(testFile);
+                }
                 return fallbackPath;
             }
             catch {

logger.cs

@@ -65,5 +65,15 @@ namespace AppStore
             }
             Log(errorMessage);
         }
+
+        public static void LogWarning(string message, Exception? ex = null)
+        {
+            string warningMessage = $"WARNING: {message}";
+            if (ex != null)
+            {
+                warningMessage += $"\nException: {ex}\nStackTrace: {ex.StackTrace}";
+            }
+            Log(warningMessage);
+        }
     }
 }