反射 Reflection 的用法
Reflection 反射
https://stackoverflow.com/questions/5122201/get-a-member-object-using-reflection-or-some-other-way
public static ConcurrentDictionary<Tuple<Type, string>,
Func<object, object[], object>> ReflectionCache
{
get
{
if (_ReflectionCache==null) {
_ReflectionCache = new ConcurrentDictionary<Tuple<Type, string>,
Func<object, object[], object>>();
}
return _ReflectionCache;
}
} private static ConcurrentDictionary<Tuple<Type, string>,
Func<object, object[], object>> _ReflectionCache = null;
public static object GetCachedProperty(object obj, string name)
{
Func<object,object[],object> del;
if (!ReflectionCache.TryGetValue(Tuple.Create<Type,string>(obj.GetType(),
name), out del)) {
MemberInfo memberInfo =
(MemberInfo)obj.GetType().GetMember(name).GetValue(0);
PropertyInfo prop = null;
FieldInfo fld = null;
switch(memberInfo.MemberType) {
case MemberTypes.Field:
fld = obj.GetType().GetField(name);
break;
case MemberTypes.Property:
prop = obj.GetType().GetProperty(name);
break;
}
if (prop == null && fld == null)
{
throw new Exception("No property or field named '" + name
+ "' could be found in the context parent.");
}
if (prop!=null) {
prop= obj.GetType().GetProperty(name);
del = prop.GetValue;
} else {
fld = obj.GetType().GetField(name);
del = delegate(object cls,object[] index) {
return fld.GetValue(cls);
};
}
ReflectionCache[Tuple.Create<Type,string>(obj.GetType(),name)]=del;
}
return(del(obj,null));
}
或
http://e-troy.blogspot.com/2014/03/c-reflection-part-1-typeinvokemember.html
//建立使用者參數
User user = new User();
user.Name = "E-Troy";
Print(user);
//建立產品參數
Product product = new Product();
product.Id = 9487;
product.ProName = "E-Troy's SuperComputer";
Print(product);
//將結果呈現
Type ot = objVo.GetType();
List<string> names = (List<string>)ot.InvokeMember(
"PropertyNames",
System.Reflection.BindingFlags.GetProperty,
null, objVo, new object[] { });
foreach (string name in names)
{
this.resultLabel.Text = objType.InvokeMember(
"GetPropertyValue",
System.Reflection.BindingFlags.InvokeMethod,
null, ot, new object[] { name }) + "\n";
}
