c# - 如何使用表达式和/或反射获取常量名称？

Question

如何使用表达式和/或反射获取常量名称？

我写了下面的但“我”总是空的？

 public static class Test1
    {
        public const string CampaignManager = "This_CAMPAIGN_MANAGER";
    }

 public static class ReflectionHelper
    {
        // <summary>
        // Get the name of a static or instance property from a property access lambda.
        // </summary>
        // <typeparam name="T">Type of the property</typeparam>
        // <param name="propertyLambda">lambda expression of the form: '() => Class.Property' or '() => object.Property'</param>
        // <returns>The name of the property</returns>
        public static string GetPropertyName<T>(Expression<Func<T>> propertyLambda)
        {
            var me = propertyLambda.Body as MemberExpression;

            if (me == null)
            {
                throw new ArgumentException("You must pass a lambda of the form: '() => Class.Property' or '() => object.Property'");
            }

            return me.Member.Name;
        }
    }

var campaignManager = ReflectionHelper.GetPropertyName(() => Test1.CampaignManager);

Answer 1

您不能将 const 字段与反射助手一起使用，因为 lambda 表达式的主体是 ConstantExpression 而不是 MemberExpression。替换

 public const string CampaignManager = "This_CAMPAIGN_MANAGER";

与

 public static string CampaignManager = "This_CAMPAIGN_MANAGER";