Скачать или смотреть Solving the MissingMethodException in Unity's Dynamic Invocation with Reflections

Discover how to effectively resolve the `MissingMethodException` in Unity when dynamically invoking methods using reflection. Learn the necessary flags and techniques to ensure your clock calls the correct methods!
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This video is based on the question https://stackoverflow.com/q/72616556/ asked by the user 'Vicente García Andrade' ( https://stackoverflow.com/u/19337024/ ) and on the answer https://stackoverflow.com/a/72617232/ provided by the user 'Guru Stron' ( https://stackoverflow.com/u/2501279/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Solving the MissingMethodException in Unity's Dynamic Invocation with Reflections

When developing video games in Unity, especially when integrating various components like timers and dynamic method calls, encountering errors is part of the learning process. One particularly frustrating issue is the MissingMethodException, which indicates that a method you're trying to invoke cannot be found. In this guide, we'll explore how to solve this problem when creating a custom clock that invokes methods dynamically using C# reflections.

The Problem

While working on a learning project in Unity with C# , you might attempt to create a clock that dynamically calls methods from other objects at each tick. This approach allows for greater control over the timing and execution of methods in your game. However, when you try to invoke a method named TEST from an instance of your Clock class, you receive the following error:

[[See Video to Reveal this Text or Code Snippet]]

Why This Error Occurs

This error typically occurs due to the incorrect use of reflection in C# . In your InvokeByName method, you're currently using the following binding flags for method invocation:

[[See Video to Reveal this Text or Code Snippet]]

While these flags tell the reflection mechanism to look for public methods, they do not specify whether the method is instance-based. If the target method is an instance method (which TEST is, since it's not static), the system needs to know that.

The Solution

To resolve the MissingMethodException, you need to provide the BindingFlags.Instance flag in your invocation call. Here’s an updated version of the InvokeByName method that includes this additional flag:

[[See Video to Reveal this Text or Code Snippet]]

Breaking Down the Solution

Understanding BindingFlags:

BindingFlags.InvokeMethod: This flag signifies that you're invoking a method.

BindingFlags.Public: This flag indicates that you're looking for public methods.

New Addition:

BindingFlags.Instance: This flag specifies that the method being called is an instance method of the class.

Target Object:
Ensure that the target object passed to the method is indeed an instance of the class containing the method you wish to call.

Setting Up the Call:
When you call your Set_Tick method, make sure to correctly reference the class and the method name:

[[See Video to Reveal this Text or Code Snippet]]

Testing the Solution:
After implementing the changes, run the clock. You should see "TEST" logged in the Unity Console, indicating that the method was successfully invoked.

Conclusion

Understanding how to effectively use reflection in C# can greatly enhance the flexibility of your Unity projects. By ensuring you include BindingFlags.Instance, you can avoid MissingMethodException errors when dynamically calling methods. This improvement not only resolves the current issue with your clock but also enhances your overall coding skills in Unity development.

Remember, handling errors is part of the process, and each bug you fix will lead to more robust and dynamic game mechanics in your projects!



Now get back to coding, test your clock, and see how it can invoke different methods dynamically. Happy coding!