有了这个课程
class Foo
{
// Want to find _bar with reflection
[SomeAttribute]
private string _bar;
public string BigBar
{
get { return this._bar; }
}
}
我想找到私有项目_bar，我将标记一个属性。这可能吗?
我已经对属性进行了此操作，我在其中查找了属性，但从未查找私有成员字段。
我需要设置哪些绑定标志来获得私有字段?
当前回答
typeof(MyType).GetField("fieldName", BindingFlags.NonPublic | BindingFlags.Instance)
其他回答
使用BindingFlags。NonPublic和BindingFlags。实例的旗帜
FieldInfo[] fields = myType.GetFields(
BindingFlags.NonPublic |
BindingFlags.Instance);
我在谷歌上搜索这个时遇到了这个，所以我意识到我在撞一个旧帖子。然而GetCustomAttributes需要两个参数。
typeof(Foo).GetFields(BindingFlags.NonPublic | BindingFlags.Instance)
.Where(x => x.GetCustomAttributes(typeof(SomeAttribute), false).Length > 0);
第二个参数指定是否希望搜索继承层次结构
下面是一些简单的get和set私有字段和属性(带有setter的属性)的扩展方法:
使用的例子:
公共类Foo ｛ private int Bar = 5; ｝ var targetObject = new Foo(); var barValue = targetObject.GetMemberValue("Bar") targetObject。SetMemberValue("Bar"， 10);//设置Bar值为10
代码:
/// <summary>
/// Extensions methos for using reflection to get / set member values
/// </summary>
public static class ReflectionExtensions
{
/// <summary>
/// Gets the public or private member using reflection.
/// </summary>
/// <param name="obj">The source target.</param>
/// <param name="memberName">Name of the field or property.</param>
/// <returns>the value of member</returns>
public static object GetMemberValue(this object obj, string memberName)
{
var memInf = GetMemberInfo(obj, memberName);
if (memInf == null)
throw new System.Exception("memberName");
if (memInf is System.Reflection.PropertyInfo)
return memInf.As<System.Reflection.PropertyInfo>().GetValue(obj, null);
if (memInf is System.Reflection.FieldInfo)
return memInf.As<System.Reflection.FieldInfo>().GetValue(obj);
throw new System.Exception();
}
/// <summary>
/// Gets the public or private member using reflection.
/// </summary>
/// <param name="obj">The target object.</param>
/// <param name="memberName">Name of the field or property.</param>
/// <returns>Old Value</returns>
public static object SetMemberValue(this object obj, string memberName, object newValue)
{
var memInf = GetMemberInfo(obj, memberName);
if (memInf == null)
throw new System.Exception("memberName");
var oldValue = obj.GetMemberValue(memberName);
if (memInf is System.Reflection.PropertyInfo)
memInf.As<System.Reflection.PropertyInfo>().SetValue(obj, newValue, null);
else if (memInf is System.Reflection.FieldInfo)
memInf.As<System.Reflection.FieldInfo>().SetValue(obj, newValue);
else
throw new System.Exception();
return oldValue;
}
/// <summary>
/// Gets the member info
/// </summary>
/// <param name="obj">source object</param>
/// <param name="memberName">name of member</param>
/// <returns>instanse of MemberInfo corresponsing to member</returns>
private static System.Reflection.MemberInfo GetMemberInfo(object obj, string memberName)
{
var prps = new System.Collections.Generic.List<System.Reflection.PropertyInfo>();
prps.Add(obj.GetType().GetProperty(memberName,
System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.Instance |
System.Reflection.BindingFlags.FlattenHierarchy));
prps = System.Linq.Enumerable.ToList(System.Linq.Enumerable.Where( prps,i => !ReferenceEquals(i, null)));
if (prps.Count != 0)
return prps[0];
var flds = new System.Collections.Generic.List<System.Reflection.FieldInfo>();
flds.Add(obj.GetType().GetField(memberName,
System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance |
System.Reflection.BindingFlags.FlattenHierarchy));
//to add more types of properties
flds = System.Linq.Enumerable.ToList(System.Linq.Enumerable.Where(flds, i => !ReferenceEquals(i, null)));
if (flds.Count != 0)
return flds[0];
return null;
}
[System.Diagnostics.DebuggerHidden]
private static T As<T>(this object obj)
{
return (T)obj;
}
}
typeof(MyType).GetField("fieldName", BindingFlags.NonPublic | BindingFlags.Instance)
在反射私有成员时需要注意的一件事是，如果您的应用程序运行在中等信任环境中(例如，当您运行在共享托管环境中时)，它将找不到它们——BindingFlags。非公共选择将被忽略。
