c# - System.Linq.Dynamic 错误 类型 'StringComparison' 中不存在属性或字段 'Person'

Question

我正在使用 System.Linq.Dynamic(Install-Package System.Linq.Dynamic)，并且我尝试将 IndexOf 重载与 StringComparison 结合使用。但是，它的行为就像尝试将 StringComparison 运算符应用于 Person 对象。我是否正确编写了查询？

try
{
     IEnumerable<Person> dynamicLinqItems = people.Where("(FirstName.IndexOf(@0, StringComparison.OrdinalIgnoreCase) >= 0)", "T");
}
catch (Exception exception)
{
    Console.WriteLine(exception);
}

错误信息

No property or field 'StringComparison' exists in type 'Person'

对象

public class Person
{
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public DateTime Birthday { get; set; }

    public int Age
    {
        get
        {
            DateTime now = DateTime.Today;
            int age = now.Year - Birthday.Year;
            if (now < Birthday.AddYears(age))
            {
                age--;
            }
            return age;
        }
    }
}

Answer 1

使用枚举可能会出现问题:How to use Enums with Dynamic Linq?

尝试以下操作:

IEnumerable<Person> dynamicLinqItems = people.Where("(FirstName.IndexOf(@0, @1) >= 0)", "T", StringComparison.OrdinalIgnoreCase);