Suppose in C# I have class that has an arbitrary number of Actions
, which can have any number of generic arguments:
public class Container
{
public Action a;
public Action<float> b;
public Action<int, float> c;
// etc...
}
And I am registering some debug lambdas on an instance of this class which just print out the name of the action's field:
public static void Main()
{
Container container = new Container();
container.a += () => Console.WriteLine("a was called");
container.b += (temp1) => Console.WriteLine("b was called");
container.c += (temp1, temp2) => Console.WriteLine("c was called");
container.a();
container.b(1.5f);
container.c(1, 1.5f);
}
I would like to automate the creation of these debug lambdas using reflection, as follows:
public static void Main()
{
Container container = new Container();
GenerateDebug(container);
if(container.a != null) container.a();
if(container.b != null) container.b(1.5f);
if(container.c != null) container.c(1, 1.5f);
}
public static void GenerateDebug(Container c)
{
Type t = c.GetType();
FieldInfo[] fields = t.GetFields(BindingFlags.Instance | BindingFlags.Public);
foreach(FieldInfo field in fields)
{
Action callback = () => Console.WriteLine(field.Name + " was called");
Type[] actionArgTypes = field.FieldType.GetGenericArguments();
if(actionArgTypes.Length == 0)
{
Action action = field.GetValue(c) as System.Action;
action += callback;
field.SetValue(c, action);
}
else
{
// 1. Create an Action<T1, T2, ...> object that takes the types in 'actionArgTypes' which wraps the 'callback' action
// 2. Add this new lambda to the current Action<T1, T2, ...> field
}
}
}
I'm able to get the desired result for Actions with no arguments - the above code does indeed print out "a was called"
- but I don't know how to do it for generics.
I believe I know what I need to do, just not how:
- Use reflection to create an
Action<T1, T2, ...>
object
using the types inactionArgTypes
, which wraps a call to thecallback
action. - Add this newly created object to the Generic Action specified by the field.
How would I go about doing this, or similar that achieves the desired effect of adding such a debug callback?
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