修复NullReferenceException

AddInManager/AIM.cs

@@ -36,41 +36,87 @@ namespace AddInManager
 
         private Result RunActiveCommand(ExternalCommandData data, ref string message, ElementSet elements)
         {
+            // 防御性检查：确保 ActiveCmd 不为空
+            if (this.ActiveCmd == null)
+            {
+                MessageBox.Show("错误：ActiveCmd 为 null");
+                return Result.Failed;
+            }
+
+            // 防御性检查：确保 ActiveCmdItem 不为空
+            if (this.ActiveCmdItem == null)
+            {
+                MessageBox.Show("错误：ActiveCmdItem 为 null");
+                return Result.Failed;
+            }
+
             var filePath = ActiveCmd.FilePath;
+
+            // 检查文件是否存在
+            if (!System.IO.File.Exists(filePath))
+            {
+                MessageBox.Show($"错误：找不到文件 {filePath}");
+                return Result.Failed;
+            }
+
             var assemLoader = new AssemLoader();
-            Result result;
+            Result result = Result.Failed; // 默认失败
+
             try
             {
                 assemLoader.HookAssemblyResolve();
+
                 var assembly = assemLoader.LoadAddinsToTempFolder(filePath, false);
-                if (null == assembly)
+
+                if (assembly == null)
                 {
+                    message = "Assembly 加载失败，返回了 null";
                     result = Result.Failed;
                 }
                 else
                 {
                     ActiveTempFolder = assemLoader.TempFolder;
-                    var externalCommand = assembly.CreateInstance(ActiveCmdItem.FullClassName) as IExternalCommand;
-                    if (externalCommand == null)
+
+                    string className = ActiveCmdItem.FullClassName;
+                    if (string.IsNullOrEmpty(className)) throw new Exception("类名为空");
+
+                    var instanceObj = assembly.CreateInstance(className);
+
+                    if (instanceObj == null)
                     {
+                        message = $"无法创建实例: {className}。请检查类名是否正确或是否有无参构造函数。";
                         result = Result.Failed;
                     }
                     else
                     {
-                        ActiveEC = externalCommand;
-                        result = ActiveEC.Execute(data, ref message, elements);
+                        var externalCommand = instanceObj as IExternalCommand;
+                        if (externalCommand == null)
+                        {
+                            message = $"{className} 没有实现 IExternalCommand 接口";
+                            result = Result.Failed;
+                        }
+                        else
+                        {
+                            ActiveEC = externalCommand;
+                            result = ActiveEC.Execute(data, ref message, elements);
+                        }
                     }
                 }
             }
             catch (Exception ex)
             {
-                MessageBox.Show(ex.ToString());
+                MessageBox.Show($"执行异常:\n{ex.Message}\n\n堆栈:\n{ex.StackTrace}");
                 result = Result.Failed;
             }
             finally
             {
-                assemLoader.UnhookAssemblyResolve();
-                assemLoader.CopyGeneratedFilesBack();
+                // 确保清理工作安全执行
+                try
+                {
+                    assemLoader.UnhookAssemblyResolve();
+                    assemLoader.CopyGeneratedFilesBack();
+                }
+                catch { /* 忽略清理时的错误，防止掩盖主异常 */ }
             }
             return result;
         }

AddinManager.iss

@@ -4,7 +4,7 @@
 ; 定义应用程序的名称
 #define MyAppName "RevitAddinManager"
 ; 定义应用程序的版本号
-#define MyAppVersion "1.0.0.0"
+#define MyAppVersion "2.0.0"
 ; 定义应用程序的发布者
 #define MyAppPublisher "ShrlAlgo"
 ; 定义应用程序的网址