我可以设置通过反射的私人财产？
public abstract class Entity
{
private int _id;
private DateTime? _createdOn;
public virtual T Id
{
get { return _id; }
private set { ChangePropertyAndNotify(ref _id, value, x => Id); }
}
public virtual DateTime? CreatedOn
{
get { return _createdOn; }
private set { ChangePropertyAndNotify(ref _createdOn, value, x => CreatedOn); }
}
}
我试过以下，它不工作，在那里t代表一个类型的Entity ：
var t = typeof(Entity);
var mi = t.GetMethod("set_CreatedOn", BindingFlags.Instance | BindingFlags.NonPublic);
我想我能做到这一点，但我不能工作了。
t.GetProperty("CreatedOn")
.SetValue(obj, new DateTime(2009, 10, 14), null);
编辑：由于物业本身是公开的，你显然不需要使用BindingFlags.NonPublic找到它。 调用SetValue尽管具有二传手少无障碍仍然没有你所期望的。
是的：
/// <summary>
/// Returns a _private_ Property Value from a given Object. Uses Reflection.
/// Throws a ArgumentOutOfRangeException if the Property is not found.
/// </summary>
/// <typeparam name="T">Type of the Property</typeparam>
/// <param name="obj">Object from where the Property Value is returned</param>
/// <param name="propName">Propertyname as string.</param>
/// <returns>PropertyValue</returns>
public static T GetPrivatePropertyValue<T>(this object obj, string propName)
{
if (obj == null) throw new ArgumentNullException("obj");
PropertyInfo pi = obj.GetType().GetProperty(propName, BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance);
if (pi == null) throw new ArgumentOutOfRangeException("propName", string.Format("Property {0} was not found in Type {1}", propName, obj.GetType().FullName));
return (T)pi.GetValue(obj, null);
}
/// <summary>
/// Returns a private Property Value from a given Object. Uses Reflection.
/// Throws a ArgumentOutOfRangeException if the Property is not found.
/// </summary>
/// <typeparam name="T">Type of the Property</typeparam>
/// <param name="obj">Object from where the Property Value is returned</param>
/// <param name="propName">Propertyname as string.</param>
/// <returns>PropertyValue</returns>
public static T GetPrivateFieldValue<T>(this object obj, string propName)
{
if (obj == null) throw new ArgumentNullException("obj");
Type t = obj.GetType();
FieldInfo fi = null;
while (fi == null && t != null)
{
fi = t.GetField(propName, BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance);
t = t.BaseType;
}
if (fi == null) throw new ArgumentOutOfRangeException("propName", string.Format("Field {0} was not found in Type {1}", propName, obj.GetType().FullName));
return (T)fi.GetValue(obj);
}
/// <summary>
/// Sets a _private_ Property Value from a given Object. Uses Reflection.
/// Throws a ArgumentOutOfRangeException if the Property is not found.
/// </summary>
/// <typeparam name="T">Type of the Property</typeparam>
/// <param name="obj">Object from where the Property Value is set</param>
/// <param name="propName">Propertyname as string.</param>
/// <param name="val">Value to set.</param>
/// <returns>PropertyValue</returns>
public static void SetPrivatePropertyValue<T>(this object obj, string propName, T val)
{
Type t = obj.GetType();
if (t.GetProperty(propName, BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance) == null)
throw new ArgumentOutOfRangeException("propName", string.Format("Property {0} was not found in Type {1}", propName, obj.GetType().FullName));
t.InvokeMember(propName, BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.SetProperty | BindingFlags.Instance, null, obj, new object[] { val });
}
/// <summary>
/// Set a private Property Value on a given Object. Uses Reflection.
/// </summary>
/// <typeparam name="T">Type of the Property</typeparam>
/// <param name="obj">Object from where the Property Value is returned</param>
/// <param name="propName">Propertyname as string.</param>
/// <param name="val">the value to set</param>
/// <exception cref="ArgumentOutOfRangeException">if the Property is not found</exception>
public static void SetPrivateFieldValue<T>(this object obj, string propName, T val)
{
if (obj == null) throw new ArgumentNullException("obj");
Type t = obj.GetType();
FieldInfo fi = null;
while (fi == null && t != null)
{
fi = t.GetField(propName, BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance);
t = t.BaseType;
}
if (fi == null) throw new ArgumentOutOfRangeException("propName", string.Format("Field {0} was not found in Type {1}", propName, obj.GetType().FullName));
fi.SetValue(obj, val);
}
您可以从通过代码派生类型访问私有二传手
public static void SetProperty(object instance, string propertyName, object newValue)
{
Type type = instance.GetType();
PropertyInfo prop = type.BaseType.GetProperty(propertyName);
prop.SetValue(instance, newValue, null);
}
这些都不工作对我来说，我的属性名称是独一无二的，所以我只是用这样的：
public static void SetPrivatePropertyValue<T>(T obj, string propertyName, object newValue)
{
// add a check here that the object obj and propertyName string are not null
foreach (FieldInfo fi in obj.GetType().GetFields(BindingFlags.Instance | BindingFlags.NonPublic))
{
if (fi.Name.ToLower().Contains(propertyName.ToLower()))
{
fi.SetValue(obj, newValue);
break;
}
}
}
//mock class
public class Person{
public string Name{get; internal set;}
}
// works for all types, update private field through reflection
public static T ReviveType<T>(T t, string propertyName, object newValue){
// add a check here that the object t and propertyName string are not null
PropertyInfo pi = t.GetType().GetProperty(propertyName, BindingFlags.Public | BindingFlags.Instance);
pi.SetValue(t, newValue, null);
return t;
}
// check the required function
void Main()
{
var p = new Person(){Name="John"};
Console.WriteLine("Name: {0}",p.Name);
//box the person to object, just to see that the method never care about what type you pass it
object o = p;
var updatedPerson = ReviveType<Object>(o, "Name", "Webber") as Person;
//check if it updated person instance
Console.WriteLine("Name: {0}",updatedPerson.Name);
}
// Console Result: -------------------
Name: John
Name: Webber
