c# - 你如何检查一个字符串是否存在于常量中

Question

请不要告诉我改用枚举。如何检查“testStr”是否在结构“Supplier”中？

public struct Supplier {
    public const string
        NA = "N/A",
        companyA = "companyA",
        companyB = "companyB";
}

string testStr = "companyA";

Answer 1

这可以通过反射来实现:

void Main()
{
  // make sure that we only take public static const
  string phrase = "companyA";
  var fields = typeof(Supplier).GetFields(BindingFlags.Static | BindingFlags.Public).Where(i => i.IsLiteral);
  foreach (FieldInfo field in fields)
  {
    string val = field.GetRawConstantValue().ToString();
    string msg = string.Format("is '{0}' equal to '{1}' => {2}", val, phrase, val == phrase);
    Console.WriteLine(msg);
  }
}

// Define other methods and classes here
public struct Supplier {
    public const string
        NA = "N/A",
        companyA = "companyA",
        companyB = "companyB";
};