//标记会话
    TIMResult res = TencentIMSDK.ConvMarkConversation(new List<string> {
      conv_id
    }, TIMConversationMarkType.kTIMConversationMarkTypeStar, true, (int code, string desc, List<ConversationOperationResult> results, string user_data)=>{
      // 标记会话异步结果
    });

    //设置会话监听器
    TencentIMSDK.SetConvEventCallback((TIMConvEvent conv_event, List<ConvInfo> conv_list, string user_data)=>{
      // 处理回调逻辑
    });

    //获取会话列表
    ConversationListFilter filter = new ConversationListFilter
    {
        conversation_list_filter_conv_type: TIMConvType.kTIMConv_C2C,//会话类型
        conversation_list_filter_mark_type: TIMConversationMarkType.kTIMConversationMarkTypeStar,//会话标记类型
        conversation_list_filter_conversation_group: "groupName"//拉取的群组名
    };
    ulong next_seq = 0; // 拉取游标
    uint count = 10; // 拉取数量
    //获取会话列表的高级接口
    TIMResult res = TencentIMSDK.ConvGetConversationListByFilter(filter, next_seq, count, (int code, string desc, ConversationListResult result, string user_data)=>{
      // 获取会话列表异步结果
      if (code == 0) {
        //拉取成功
        bool isFinished = result.conversation_list_result_is_finished; //是否拉取完
        next_seq = result.conversation_list_result_next_seq; //后续分页拉取的游标
        var conversationList = result.conversation_list_result_conv_list; //此次拉取到的消息列表
        //如果没有拉取完，使用返回的nextSeq继续拉取直到isFinished为true
      }
    });