diff --git a/UserClass/AsyncTcpServer.cs b/UserClass/AsyncTcpServer.cs
index a18f351..24d739b 100644
--- a/UserClass/AsyncTcpServer.cs
+++ b/UserClass/AsyncTcpServer.cs
@@ -168,7 +168,7 @@ namespace SunlightAggregationManager.UserClass
             Console.WriteLine("TCP SERVER:START");
         }
    
-        public static string Command(string dat)
+        public static string Command(string dat)//
         {
             string Command="", ret ="";
 
@@ -176,7 +176,7 @@ namespace SunlightAggregationManager.UserClass
             var deserialized = JsonSerializer.Deserialize<Dictionary<string, object>>(dat)!;
             if (deserialized.TryGetValue("Command", out var val) && val != null) Command = val.ToString()!;
 
-            if (Command == "Info")
+            if (Command == "Info")//回复info请求的信息
             {
                 var t = ToList(MainWindowViewModel._machines).ToJsonString();
 
@@ -189,7 +189,7 @@ namespace SunlightAggregationManager.UserClass
             return ret;
         }
 
-        public static List<Dictionary<string, object>> ToList(DataTable table)
+        public static List<Dictionary<string, object?>>? ToList(DataTable table)//datatable转list
         {
             if (table == null) return null;
 
@@ -198,7 +198,11 @@ namespace SunlightAggregationManager.UserClass
             return table.AsEnumerable().Select(row =>
                 table.Columns.Cast<DataColumn>().ToDictionary(
                     col => col.ColumnName,
-                    col => row[col]
+                    col => {
+                        var value = row[col];
+                        // 核心修改：如果是数据库空值 DBNull.Value，则转为 C# 的 null，否则保持原值
+                        return value == DBNull.Value ? null : value;
+                    }
                 )
             ).ToList();
         }