fix: 修复 at 全体成员的崩溃 bug

Author: SlimeNull

src/EleCho.GoCqHttpSdk/Message/CqAtMsg.cs

@@ -9,16 +9,27 @@ namespace EleCho.GoCqHttpSdk.Message
     /// </summary>
     public record class CqAtMsg : CqMsg
     {
+        /// <summary>
+        /// 消息类型: @
+        /// </summary>
         public override string MsgType => Consts.MsgType.At;
 
         /// <summary>
         /// 说明: @的 QQ 号, all 表示全体成员
         /// 可能的值: QQ 号, all
         /// </summary>
-        public long QQ { get; set; }
+        public long QQ { get; set; } = -1;
 
+        /// <summary>
+        /// 名称
+        /// </summary>
         public string? Name { get; set; }
 
+        /// <summary>
+        /// 是 AT 全体成员
+        /// </summary>
+        public bool IsAtAll { get; set; }
+
         internal CqAtMsg()
         { }
 
@@ -27,19 +38,28 @@ public CqAtMsg(long qq)
             QQ = qq;
         }
 
+        /// <summary>
+        /// 获取 AT 所有人的消息段
+        /// </summary>
+        public static CqAtMsg AtAll => new CqAtMsg() { IsAtAll = true };
+
         internal override void ReadDataModel(CqMsgDataModel? model)
         {
             CqAtMsgDataModel? m = model as CqAtMsgDataModel;
             if (m == null)
                 throw new ArgumentException();
 
-            QQ = long.Parse(m.qq);
+            if (long.TryParse(m.qq, out long _qq))
+                QQ = _qq;
+            else if (m.qq.Equals("all", StringComparison.OrdinalIgnoreCase))
+                IsAtAll = true;
+
             Name = m.name;
         }
 
         internal override CqMsgDataModel? GetDataModel()
         {
-            return new CqAtMsgDataModel(QQ.ToString(), Name);
+            return new CqAtMsgDataModel(IsAtAll ? "all" : QQ.ToString(), Name);
         }
     }
 }