1 feat: 为MqttServerDetailView添加取消关联功能

2
   3 - 在MqttServerDetailView的DataGrid右键菜单中添加"取消关联"选项
   4 - 实现UnassignAlias命令，允许用户从MQTT服务器取消关联变量
   5 - 使用确认对话框以防止误操作
   6 - 集成现有的删除API来实际移除变量与MQTT服务器的关联
   7 - 更新UI以提供用户反馈
   8
   9 此功能允许用户通过右键菜单轻松取消MQTT服务器与变量的关联。

DMS.WPF/Services/MqttAliasDataService.cs

@@ -133,21 +133,23 @@ public class MqttAliasDataService : IMqttAliasDataService
     public async Task<bool> DeleteMqttAlias(MqttAliasItem mqttAlias)
     {
         // 从数据库和内存中删除MQTT别名
-        var result = await _mqttAliasManagementService.UpdateAsync(new MqttAlias 
-        { 
-            Id = mqttAlias.Id, 
-            VariableId = mqttAlias.VariableId, 
-            MqttServerId = mqttAlias.MqttServerId,
-            Alias = null // Setting alias to null effectively removes the alias
-        });
+        var result = await _mqttAliasManagementService.DeleteAsync(mqttAlias.Id);
 
-        if (result > 0)
+        if (result )
         {
-            // 从界面删除MQTT别名
-            _dataStorageService.MqttAliases.Remove(mqttAlias.Id);
+            
+            if (_dataStorageService.MqttServers.TryGetValue(mqttAlias.MqttServerId, out var mqttServerItem))
+            {
+                mqttServerItem.VariableAliases.Remove(mqttAlias);
+            }
+            if (_dataStorageService.Variables.TryGetValue(mqttAlias.VariableId, out var variableItem))
+            {
+                variableItem.MqttAliases.Remove(mqttAlias);
+            }
+            _dataStorageService.MqttAliases.Remove(mqttAlias.Id, out _);
         }
 
-        return result > 0;
+        return result;
     }
     
     /// <summary>