通过反射获取公共静态字段的值

Question

这是我到目前为止所做的:

 var props = typeof (Settings.Lookup).GetFields();
 Console.WriteLine(props[0].GetValue(Settings.Lookup)); 
         // Compile error, Class Name is not valid at this point

这是我的静态类:

public static class Settings
{
   public static class Lookup
   {
      public static string F1 ="abc";
   }
}

Answer 1

您需要传递null给GetValue,因为此字段不属于任何实例:

props[0].GetValue(null)

Answer 2

您需要使用Type.GetField(System.Reflection.BindingFlags)重载:

• http://msdn.microsoft.com/en-us/library/4ek9c21e.aspx

例如:

FieldInfo field = typeof(Settings.Lookup).GetField("Lookup", BindingFlags.Public | BindingFlags.Static);

Settings.Lookup lookup = (Settings.Lookup)field.GetValue(null);

Answer 3

签名FieldInfo.GetValue是

public abstract Object GetValue(
    Object obj
)

obj您要从中检索值的对象实例在哪里,或者null它是否为静态类.所以这应该做:

var props = typeof (Settings.Lookup).GetFields();
Console.WriteLine(props[0].GetValue(null)); 

Answer 4

尝试这个

FieldInfo fieldInfo = typeof(Settings.Lookup).GetFields(BindingFlags.Static | BindingFlags.Public)[0];
    object value = fieldInfo.GetValue(null); // value = "abc"