那麼......有一個非常扭曲的方式:)當然。 也就是使用反射! 你不能得到一個字段的地址,但我們可以使用反射。
反射是不是直接訪問一個字段慢,我發出警告。 真的,訪問其他類的私人領域是一個非常糟糕的做法! 然而,當你沒有控制其他人編寫的代碼時,有時候會對一些骯髒的黑客有用。
在這裏的例子,但我一直說,這不是一個好習慣,這裏只是出於好奇和教育目的!
精細另一種方式來訪問你的領域,使用性質或使用修改屬性的類。
// Our FieldReference class that internally uses reflection to get or set a field value.
public class FieldReference<T>
{
private object ownerObject;
private FieldInfo fieldInfo;
public FieldReference(object ownerObject, string fieldName)
{
this.ownerObject = ownerObject;
this.fieldInfo = ownerObject.GetType().GetField(fieldName, BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance);
}
public FieldReference(object ownerObject, FieldInfo fieldInfo)
{
this.ownerObject = ownerObject;
this.fieldInfo = fieldInfo;
}
public T Value
{
get { return (T)this.fieldInfo.GetValue(this.ownerObject); }
set { this.fieldInfo.SetValue(this.ownerObject, value); }
}
}
// Our dummy class
public class MyClass
{
// Our field we want to expose.
private int myField;
public MyClass(int value)
{
this.myField = value;
}
// Just a function we use to print the content of myField.
public override string ToString()
{
return this.myField.ToString();
}
}
class Program
{
public static void Main()
{
// We create our class.
MyClass mc = new MyClass(5);
// We print field value, should be 5 :)
Console.WriteLine(mc.ToString());
// We create our field reference
FieldReference<int> fieldref = new FieldReference<int>(mc, "myField");
// We set the value using field reference.
// Note, we accessed a private field :)
fieldref.Value = 100;
// Now we print the value, should be 100!
Console.WriteLine(mc.ToString());
Console.ReadLine();
}
}
閱讀上的指針。這個:http://blogs.msdn.com/b/ericlippert/archive/2011/06/23/ref-returns-and-ref-locals.aspx –