C＃ - 试图重构功能编程块

Question

我试图重构此代码，其中是否存在对象是否在缓存中存在差异。如果不在缓存中，则消耗外部API并将结果返回到lambda表达式变量。如果是，请使用缓存变量。

我的问题是，我认为代码块是两次编写的，唯一的区别是变量。

  var cacheHit = _cache.TryGetValue("ClientUserId", out string cachedUser);
  if (!cacheHit)
  {
      await _userM.GetUserAsync(
       dbData.CreateEmployeeID.ToString(),
        cancellationToken)
        .MapOnFailure(failure => new AppF(failure.Message, failure.Exception))
        .DoAsync(async user =>
        {
        _cache.Set("ClientUserId", user.ClientUserId, cacheExpiration);

        var opsRequest = new OperationStatusRequest();

        var results = await _monitoringService.LogHttpRequestResponseAsync(
            operationStatusRequest,
            JsonSerializer.Serialize(cRequest),
            async () =>
                await _client.DetailsAsync(user.ClientUserId, cancellationToken) //from API call
        .DoAsync(async _ =>
        {
            //code here
        }
        ).DoOnFailureAsync(async _ =>
        {
             //code here
        });

        }); //user
  }
  else
  {
      //don't call GetUserAsync if user is already cached, proceed with the operation

        var opsRequest = new OperationStatusRequest();

        var results = await _monitoringService.LogHttpRequestResponseAsync(
            operationStatusRequest,
            JsonSerializer.Serialize(cRequest),
            async () =>
                await _client.DetailsAsync(cachedUser, cancellationToken) //cachedUser
        .DoAsync(async _ =>
        {
            //code here
        }
        ).DoOnFailureAsync(async _ =>
        {
             //code here
        });

  }

我已经对主要区别发表了评论，但是IF中的代码几乎遵循同一操作。

有没有办法在不重新编写整个实现的情况下编写IF-ELSE块？