同一账号只写第一次，不同账号第一次爆炸 ，就因为下面部分得到逻辑有问题

修改后的代码如下：1.成功完成角色注册信息的数据库化记录。2.每个账号上限3个角色。3.角色是可以重名的，但是角色的id不会重名。

internal class UserCache
{
      private ConcurrentDictionary<string, List<string>> userPlayerIds = dataUserPlayerIds();
      //private ConcurrentDictionary<string, List<string>> userPlayerIds = new ConcurrentDictionary<string, List<string>>();
      //private ConcurrentDictionary<string, PlayerModel> players = new ConcurrentDictionary<string, PlayerModel>();
      private ConcurrentDictionary<string, PlayerModel> players = dataPlayers();//所有账号的角色信息，虽然角色信息中不包含账号id

      public static ConcurrentDictionary<string, List<string>> dataUserPlayerIds()//这样好像就行了
      {
          StreamReader file = new StreamReader("userPlayerIds.txt");
          string all = file.ReadToEnd();
          file.Close();
          ConcurrentDictionary<string, List<string>> results = new ConcurrentDictionary<string, List<string>>();
          try
          {
              //ConcurrentDictionary<string, List<string>> results = JsonConvert.DeserializeObject<ConcurrentDictionary<string, List<string>>>(JsonConvert.DeserializeObject(all).ToString());
              results = JsonConvert.DeserializeObject<ConcurrentDictionary<string, List<string>>>(JsonConvert.DeserializeObject(all).ToString());
          }
          catch {
              Console.WriteLine("dataUserPlayerIds()中出现问题");
          }
              return results;
          //return JsonConvert.DeserializeObject(all);
      }
      public static ConcurrentDictionary<string, PlayerModel> dataPlayers()//这样好像就行了
      {
          StreamReader file = new StreamReader("players.txt");
          string all = file.ReadToEnd();
          file.Close();
          ConcurrentDictionary<string, PlayerModel> results = new ConcurrentDictionary<string, PlayerModel>();
          try
          {
              results = JsonConvert.DeserializeObject<ConcurrentDictionary<string, PlayerModel>>(JsonConvert.DeserializeObject(all).ToString());
          }
          catch {
              Console.WriteLine("dataPlayers()中出现问题");
          }
              return results;
          //return JsonConvert.DeserializeObject(all);
      }
      public void put(string accId, PlayerModel model)//逻辑刚开始有些小问题，问题不大
  {
          bool ur = false;
          if (this.userPlayerIds.ContainsKey(accId))//这里出了问题了，同在一个put函数中
          {

              List<string> stringList;
              List<string> stringList_out;
              this.userPlayerIds.TryGetValue(accId, out stringList);//得到已有的角色id（player）
              stringList.Add(model.id);//给账号新加一个角色

              //如果已存账号信息--
              //重复的键，TryAdd是家不进去的
              ur = this.userPlayerIds.TryRemove(accId, out stringList_out);
              ur = this.userPlayerIds.TryAdd(accId, stringList);//同名 键 应该是可以覆盖的--不是第一次先用字符串修改值，再增加到对应键值对中
          }
          else
          {//重来没有，自然不会重复
              ur = this.userPlayerIds.TryAdd(accId, new List<string>() { model.id });//第一次只加1个
          }
          if (ur)//这次应该没问题了
          {
              StreamWriter file = new StreamWriter("userPlayerIds.txt");
              string json = JsonConvert.SerializeObject(this.userPlayerIds);
              Console.WriteLine("userPlayerIds.TryAdd：" + json);
              file.Write(json);
              file.Close();
          }
    bool pr=this.players.TryAdd(model.id, model);//最后真正怎加角色信息 player=角色 account=账号
          //将角色详细信息写入文件
          if (pr)
          {
              StreamWriter file = new StreamWriter("players.txt");
              string json = JsonConvert.SerializeObject(this.players);
              Console.WriteLine("players.TryAdd：" + json);
              file.Write(json);  
              file.Close();
          }
      }