Question

假设我们有一些类没有通用的接口或基类。我们如何获得想要的班级名称？可能吗？我发现以下代码可以正常工作。但是，我想通过传递类名在函数中使用它。还有其他方法可以实现吗？

 MemberInfo[] members = typeof(objectWhatever).GetMembers();
 foreach (MemberInfo memberInfo in members.Where(p => p.MemberType == MemberTypes.Property))
 {
      Console.WriteLine("Name: {0}", memberInfo.Name); // Name: MyField
 }

我尝试编写以下内容，但在语法上不起作用。

 public static List<string> FieldNames(object obj ,string className)
 {
     dynamic changedObj = Convert.ChangeType(obj, Type.GetType(className));

     MemberInfo[] members = typeof(changedObj).GetMembers();

     foreach (MemberInfo memberInfo in members.Where(p => p.MemberType == MemberTypes.Property))
     {
         Console.WriteLine("Name: {0}", memberInfo.Name); // Name: MyField
     }
}

Answer 1

我相信你想要

MemberInfo[] members = Type.GetType(className).GetMembers();

typeof()仅适用于已知的编译时类型-对于通用类型，例如typeof(string)或typeof(T)。

如果您正要这样做，那么您也不需要更改 obj的类型即可使用反射来查看其成员的值。

Answer 2

首先，我们必须找到给定名称的Type，例如

// className either in short format: "Form" or
//                  in full  format: "System.Windows.Forms.Form"
private static Type TypeFromName(string className)
{
  if (string.IsNullOrWhiteSpace(className))
    return null;

  return AppDomain
    .CurrentDomain
    .GetAssemblies()
    .SelectMany(asm => asm.GetTypes())
    .FirstOrDefault(t => t.Name == className || t.Namespace + "." + t.Name == className);
}

然后我们准备枚举 properties ：唯一的区别是我们使用tp-Type found 而不是 hardcoded typeof(objectWhatever)

 string className = ...

 Type tp = TypeFromName(className);

 if (tp != null)
 {
     var members = tp
       .GetMembers()
       .Where(p => p.MemberType == MemberTypes.Property);

     foreach (MemberInfo memberInfo in members)
     {
         Console.WriteLine("Name: {0}", memberInfo.Name); 
     }
 }
 else 
 {
     // className has not been found
 }

打印任何希望的类的字段名称

2 个答案: