C＃-Linq：在linq中使用string.equals进行比较时忽略大小写

Question

如何在下面的代码中使用“ StringComparison”属性？

string _strVariable = "New York";

var _countVar = nestList
  .SelectMany(list => list)
  .Count(city => string.Equals(city, _strVariable));

下面尝试过，但是它们不起作用，会引发错误。

var _countVar = nestList
  .SelectMany(list => list)
  .Count(city => string.Equals(city, _strVariable,StringComparison.OrdinalIgnoreCase));

var _countVar = nestList
  .SelectMany(list => list)
  .Count(city => string.Equals(city, _strVariable,StringComparer.OrdinalIgnoreCase)); 

Answer 1

为什么不能使用ToLower()这样的字符串库函数>

var _countVar = nestList
  .SelectMany(list => list)
  .Count(city => city.ToLower() == _strVariable.ToLower);