c# - 列出具有特定属性的字段

Question

我正在尝试列出具有特定属性的所有字段，但仍然不太明白 GetValue() 需要什么样的对象。

[AttributeUsage(AttributeTargets.Field, AllowMultiple = true)]
class SerializedAttribute : Attribute
{

}

class Program
{
    [Serialized] public Single AFloat = 100.0f;
    [Serialized] public Single AnotherFloat = 125.5f;
    [Serialized] public Single OnceAgain = 75.0f;

    static void Main(string[] args)
    {

        foreach(FieldInfo field in typeof(Program).GetFields())
        {
            foreach(Attribute attr in field.GetCustomAttributes())
            {
                if (attr is SerializedAttribute)
                {
                    Console.WriteLine("\t" + "Variable name: " + field.Name + "\t" + "Variable value:" + field.GetValue(/*"??????????????"*/));           
                }
            }
        }

        Console.ReadKey();

    }
}

我尝试了几次谷歌搜索，但显然我不太擅长解决问题。

Answer 1

GetValue 需要 Program 的实例

var program = new Program();
foreach (FieldInfo field in typeof(Program).GetFields())
{
    foreach (Attribute attr in field.GetCustomAttributes())
    {
        if (attr is SerializedAttribute)
        {
            Console.WriteLine("\t" + "Variable name: " + field.Name + 
                "\t" + "Variable value:" + field.GetValue(program));
        }
    }
}

也许您的意思是使这些属性静态，在这种情况下，您可以将null 传递给GetValue。尽管您正在寻找 SerializedAttribute，但情况似乎并非如此。