Update: Open source project SharpCut delivers a less than 50K library which does what described here in one line plus much more. Check it out.
Content
- Inspiration: C#.Net Calling Grandparent's Virtual Method (base.base in C#)
- Prototype: Strong Typed, High Performance Reflection with C# Delegate (Part I) <= you are here
- Performance: Strong Typed, High Performance Reflection with C# Delegate (Part II)
- Library Usage: Strong Typed, High Performance Reflection with C# Delegate (Part III)
The process of finding a solution for base.base.VirtualMethod() in C# inspired me to create utility/extension method for reflection. The goal was to use delegate instead of MethodInfo.Invoke or DynamicMethod.Invoke. Using the Invoke method requires boxing all value type to object, create an object array, unboxing before call the actual method, boxing/unboxing the return value if necessary and cast the return value to the excepted data type. Very involved indeed.
If the MethodInfo or DynamicMethod is reused to make the call, using Invoke method is costly and error prone. Can we create a Delegate object out of them so that it can be strong typed, and hopefully more efficient.
DynamicMethod class has overloaded methods named CreateDelegate. And Delegate class too has CreateDelegate methods that takes MethodInfo, so .Net framework does have the weapon we need.
Let's go step by step.
Utility method to create non-virtual invoke DynamicMethod from MethodInfo
Fist, extract the part that create the DynamicMethod in my last post and enhance it to work with any given MethodInfo object.
public static DynamicMethod CreateNonVirtualDynamicMethod(this MethodInfo method) { int offset = (method.IsStatic ? 0 : 1); var parameters = method.GetParameters(); int size = parameters.Length + offset; Type[] types = new Type[size]; if (offset > 0) types[0] = method.DeclaringType; for (int i = offset; i < size; i++) { types[i] = parameters[i - offset].ParameterType; } DynamicMethod dynamicMethod = new DynamicMethod( "NonVirtualInvoker_" + method.Name, method.ReturnType, types, method.DeclaringType); ILGenerator il = dynamicMethod.GetILGenerator(); for (int i = 0; i < types.Length; i++) il.Emit(OpCodes.Ldarg, i); il.EmitCall(OpCodes.Call, method, null); il.Emit(OpCodes.Ret); return dynamicMethod; }
With this tool, we can slim down our implementation of base.base in class C quite a bit.
class C : B { private static readonly DynamicMethod baseBaseFoo; static C() { MethodInfo fooA = typeof(A).GetMethod("foo", BindingFlags.Public | BindingFlags.Instance); baseBaseFoo = fooA.CreateNonVirtualDynamicMethod(); } public override string foo() { return (string)baseBaseFoo.Invoke(null, new object[] { this }); } }
Create Delegate from DynamicMethod
As we said in the beginning that the DynamicMethod.Invoke is verbose and and inefficient. The solution is to create a Delegate out of DynamicMethod and use the Delegate. We can do it right inside the class C, and you can see that the call to the baseBaseFoo now is short, clean and strong typed. We'll discuss the performance benefit in next post.
class C : B { private static readonly Func<A, string> baseBaseFoo; static C() { MethodInfo fooA = typeof(A).GetMethod("foo", BindingFlags.Public | BindingFlags.Instance); baseBaseFoo = (Func<A, string>)fooA.CreateNonVirtualDynamicMethod() .CreateDelegate(typeof(Func<A, string>)); } public override string foo() { return baseBaseFoo(this); } }
This is great with one downside is that we had to cast here and there when we create the Delegate. Can we extract this logic into a generic method so that in class C I can simply do this?
baseBaseFoo = GetNonVirtualInvoker<Func<A, string>>(fooA);
My first attempt was not successful. See the code below
public static TDelegate GetNonVirtualInvoker<TDelegate>(this MethodInfo method) where TDelegate : Delegate { var dynamicMethod = CreateNonVirtualDynamicMethod(method); return (TDelegate)dynamicMethod.CreateDelegate(typeof(TDelegate)); }
It would be most ideal if this works so that the generic method only takes Delegate as type parameter. But the compiler give me a red line under the constrain type Delegate and complained that "Constraint cannot be special class 'System.Delegate'". Why Microsoft? Come and vote for the change here!
My second attempt is to use cast. But the compiler was still unhappy with error message: "Cannot cast expression of type 'System.Delegate' to 'TDelegate'".
public static TDelegate GetNonVirtualInvoker<TDelegate>(this MethodInfo method) { var dynamicMethod = CreateNonVirtualDynamicMethod(method); return (TDelegate)dynamicMethod.CreateDelegate(typeof(TDelegate)); }
This is very annoying. Is something wrong with the framework/language design? The workaround turn out to be very simply. Cast to object then back to TDelegate. (Update 5/15: actually there is a workaround to avoid double cast)
Finally the code below works:public static TDelegate GetNonVirtualInvoker<TDelegate>(this MethodInfo method) { var dynamicMethod = CreateNonVirtualDynamicMethod(method); return (TDelegate)(object)dynamicMethod.CreateDelegate(typeof(TDelegate)); }
Thus the class C can be further simplified to:
class C : B { private static readonly Func<A, string> baseBaseFoo; static C() { MethodInfo fooA = typeof(A).GetMethod("foo", BindingFlags.Public | BindingFlags.Instance); baseBaseFoo = fooA.GetNonVirtualInvoker<Func<A, string>>(); } public override string foo() { return baseBaseFoo(this); } }
One stop shop extension method returns Delegate from type and method name
Now look at the goal set in the last post and repeated below. The class C must be further cut down to achieve the goal.
class C : B { private static readonly Func<A, string> baseBaseFoo = typeof(A).GetNonVirtualInvoker<Func<A, string>>("foo"); public override string foo() { return baseBaseFoo(this); } }
Indeed, getting the MethodInfo object from a given type is never a one liner, it becomes verbose when method is overloaded thus parameters types matching is necessary. Things are getting more interesting now. Delegate has the precise information about the signature of method. Our utility method can be further enhanced to find the method from a given type with just a method name, because the parameter information can be found in the Delegate type.
public static TDelegate GetNonVirtualMethod<TDelegate>(this Type type, string name) { Type delegateType = typeof(TDelegate); if (!typeof(MulticastDelegate).IsAssignableFrom(delegateType)) { throw new InvalidOperationException( "Expecting type parameter to be a Delegate type, but got " + delegateType.FullName); } var invoke = delegateType.GetMethod("Invoke"); ParameterInfo[] parameters = invoke.GetParameters(); int size = parameters.Length - 1; Type[] types = new Type[size]; for (int i = 0; i < size; i++) { types[i] = parameters[i + 1].ParameterType; } var method = type.GetMethod(name, BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.InvokeMethod, null, types, null); if (method == null) return default(TDelegate); var dynamicMethod = CreateNonVirtualDynamicMethod(method); return (TDelegate)(object)dynamicMethod.CreateDelegate(delegateType); }
This extension method let you created a Delegate that can make non-virtual invocation to the named method of given type. The method parameters matches the signature of the Delegate. For example, instance method ClassA.Method1(string, int) matches Delegate(ClassA, string, int). The extension method started with making sure the type parameter is indeed a Delegate type, then retrieve the parameter types from the Delegate's Invoke method, then lookup the method in the given type, create dynamic method and finally create the Delegate.
Continue...
The complete code used in this blog can be found here. The code is the result of inception and prototype of the Common.Reflection. In next few posts, we'll implement formal extension methods with enhanced features and compare the performance between direct method call, reflection invoke and Delegate call.
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The path running from base.base.It's fascinating to see how VirtualMethod() makes strong-typed, effective reflections utilizing delegates. The improved code demonstrates how to make complicated calls simpler. Awaiting with interest the next blogs on improved extension techniques and performance evaluations.
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Your article is a brilliant exploration of optimizing reflection in C#. The step-by-step explanations and code snippets make it a valuable resource for developers seeking efficient reflection solutions. Thanks for sharing!
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This blog article is an intriguing investigation into optimizing reflection in C#. The author's journey from the beginning.The ability of VirtualMethod() to provide strong-typed, efficient reflection utilizing delegates is astonishing. I like the code samples and explanations, and I look forward to seeing the performance comparison in future postings. Excellent job!
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This code is a brilliant example of optimizing reflection in C#. The utility methods simplify and enhance code efficiency. A valuable contribution to C# development. Great work!
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This article likely discusses the use of C# delegates for strong-typed and high-performance reflection, offering insights into how delegates can be leveraged to enhance reflection capabilities in C# programming.
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I'm extremely impressed with the author's in-depth understanding of C# reflection and their ability to explain complex concepts in a clear and concise way. The code is well-written and easy to follow, and the step-by-step guide to creating a strong typed, high performance delegate is invaluable. I highly recommend this article to anyone who wants to learn more about reflection or improve the performance of their code.
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The process of finding a solution for base.base.VirtualMethod() in C# inspired me to create utility/extension method for reflection. The goal was to use delegate instead of MethodInfo.Invoke or DynamicMethod.Invoke. Using the Invoke method requires boxing all value type to object, create an object array, unboxing before call the actual method, boxing/unboxing the return value if necessary and cast the return value to the excepted data type. Very involved indeed.
If the MethodInfo or DynamicMethod is reused to make the call, using Invoke method is costly and error prone. Can we create a Delegate object out of them so that it can be strong typed, and hopefully more efficient.
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DynamicMethod class has overloaded methods named CreateDelegate. And Delegate class too has CreateDelegate methods that takes MethodInfo, so .Net framework does have the weapon we need.
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Thanks for the insightful discussion on strong typing and its impact on performance! Your analysis really highlights the benefits of type safety in programming. I appreciate the examples you provided to illustrate your points—very helpful for understanding these concepts better
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This post was incredibly helpful. I’ve been trying to understand strong typed high performance for a while, and your explanations make me feel ready to try it out. I’ll be putting this into practice soon and can’t wait to see the results. Keep up the great work.
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This article explores the optimization of reflection in C# through a high-performance approach that leverages delegates rather than the more costly MethodInfo.Invoke or DynamicMethod.Invoke. By using delegates for non-virtual method invocation, the author demonstrates an approach that bypasses the typical overhead associated with reflection, such as boxing/unboxing and type casting. The step-by-step breakdown includes creating a utility for DynamicMethod, converting it to a delegate, and extending functionality for method lookup by name. This solution is particularly relevant for scenarios requiring frequent or performance-critical reflective operations. Data science courses in Gurgaon
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This update on the SharpCut open-source project is incredibly exciting! The approach you've taken to streamline the reflection process in C# is impressive, especially by leveraging delegates instead of relying on the more cumbersome MethodInfo.Invoke or DynamicMethod.Invoke. Data science courses in Visakhapatnam
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Great post! The detailed explanation of using delegates and dynamic methods to improve reflection performance in C# is very insightful. I especially appreciate the solution for simplifying base.base invocations and making the code more efficient and strongly typed. The step-by-step approach is clear and helpful. Thanks for sharing this!
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Fantastic read! Your deep dive into strong typing with reflection and delegates offers a much-needed clarity on performance optimization in C#.
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Great explanation of leveraging C# delegates and dynamic methods for high-performance reflection! The breakdown of creating strong-typed delegates from MethodInfo is really insightful and shows the potential for improving efficiency in reflection-based calls. It’s interesting how you worked around the language limitations with the double cast workaround. Looking forward to the performance benchmarks in the next post!
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This post offers a practical approach to optimizing reflection in C# through the use of strong typed delegates, significantly improving performance. The detailed breakdown of replacing MethodInfo.Invoke with delegates is a valuable read for C# developers focused on efficiency. Great insights for those dealing with high-performance applications in .NET!
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Strongly typed, high-performance reflection with C# delegates allows developers to create flexible and efficient code. By leveraging delegates, you can invoke methods dynamically while maintaining type safety, which enhances performance and reduces runtime errors. This approach streamlines event handling and callback mechanisms, making it easier to build responsive and maintainable applications.
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