DefaultIfEmpty被忽略

Question

我试图弄清楚为什么此LINQ查询（C＃）无法按预期工作：

import json
import os
from sendgrid.helpers.stats import *
from sendgrid import *

# NOTE: you will need move this file to the root directory of this project to execute properly.

# Assumes you set your environment variable:
# https://github.com/sendgrid/sendgrid-python/blob/master/TROUBLESHOOTING.md#environment-variables-and-your-sendgrid-api-key
sg = SendGridAPIClient(os.environ.get('SG****'))


def pprint_json(json_raw):
    print(json.dumps(json.loads(json_raw), indent=2, sort_keys=True))



def build_global_stats():
    global_stats = Stats()
    global_stats.start_date = '2020-01-13'
    global_stats.end_date = '2020-01-14'
    global_stats.aggregated_by = 'day'
    return global_stats.get()



def get_global_stats():
    stats_params = build_global_stats()
    response = sg.client.stats.get(query_params=stats_params)
    print(response.status_code)
    print(response.headers)
    pprint_json(response.body)


get_global_stats()
Traceback (most recent call last):

  File "<ipython-input-10-cee8ef5434a2>", line 35, in <module>
    get_global_stats()

  File "<ipython-input-10-cee8ef5434a2>", line 29, in get_global_stats
    response = sg.client.stats.get(query_params=stats_params)

  File "C:\Users\blah\AppData\Local\Continuum\anaconda3\lib\site-packages\python_http_client\client.py", line 262, in http_request
    self._make_request(opener, request, timeout=timeout)

  File "C:\Users\blah\AppData\Local\Continuum\anaconda3\lib\site-packages\python_http_client\client.py", line 178, in _make_request
    raise exc

ForbiddenError: HTTP Error 403: FORBIDDEN

PS我更正了属性的名称，它们令人误解，对不起。

假设对于某些人// If the user receives 3 salaries, take the first, if not, show as 100 var salary = populationData .Select( x => x.AdultData? .TaxPayerData? .Where(x => x.Salary.Count == 3) .Select(x => x.Value).FirstOrDefault() ) .DefaultIfEmpty(100) .ToList(); 和IsAdult = false，对于那些人，我需要TaxPayer = null或我选择的任何其他值，但不需要DefaultIfEmpty = 100。目前，我的结果是null。 有什么想法吗？

Answer 1

您可以尝试这种方式

// If the user receives 3 salaries, take the first, if not, show as 100 
var salary = populationData
             .Select(
                 x => {
                       var result = x.AdultData?
                       .TaxPayerData?
                       .Where(x => x.Salary.Count == 3)
                       .Select(x => x.Value).FirstOrDefault()
                       return result ?? 100;}
             )
             .ToList();