反射值类型的Interlocked.Increment
我想使用 Interlocked.Increment 来增加对象的整数成员，但我想通过反射引用这些整数。我的示例代码无法正常工作，如下所示。
public class StatBoard
{
#region States (count of)
public int Active;
public int Contacting;
public int Polling;
public int Connected;
public int Waiting;
public int Idle;
#endregion
protected IEnumerable<FieldInfo> states;
public StatBoard()
{
Type foo = GetType();
FieldInfo[] fields = foo.GetFields(BindingFlags.Instance & BindingFlags.Public);
states = from n in fields
where n.FieldType == typeof(int)
select n;
}
public void UpdateState(string key)
{
FieldInfo statusType = states.First(
i => i.Name == key
);
System.Threading.Interlocked.Increment(ref (int)statusType.GetValue(this));
}
}
如何修改 UpdateState 方法才能使其正常工作？
I want to increment integer members of an object using Interlocked.Increment, but I want to reference those integers via reflection. Example code I have, which is not working, is below.
public class StatBoard
{
#region States (count of)
public int Active;
public int Contacting;
public int Polling;
public int Connected;
public int Waiting;
public int Idle;
#endregion
protected IEnumerable<FieldInfo> states;
public StatBoard()
{
Type foo = GetType();
FieldInfo[] fields = foo.GetFields(BindingFlags.Instance & BindingFlags.Public);
states = from n in fields
where n.FieldType == typeof(int)
select n;
}
public void UpdateState(string key)
{
FieldInfo statusType = states.First(
i => i.Name == key
);
System.Threading.Interlocked.Increment(ref (int)statusType.GetValue(this));
}
}
How do I modify the UpdateState method to make this work?
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这在设计上是行不通的。 int 是一种值类型。 GetValue() 方法返回 int 的副本。您将增加该副本，而不是原始副本。反射没有任何方法来获取对值类型值的引用。
This cannot work by design. An int is a value type. The GetValue() method returns a copy of the int. You'll increment that copy, not the original. Reflection doesn't have any way to get a reference to a value type value.