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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Article] How to write custom event listener for C# changes in React","articleBody":"Example code to put in the article\r\n\r\nC#\r\n```\r\n    public Action AddKeyPressListener(object callback)\r\n    {\r\n        var cb = ReactUnity.Helpers.Callback.From(callback);\r\n        Action\u003cstring> listener = null;\r\n        listener = (val) => {\r\n            if (cb?.callback == null) // Check if we lost reference to cb, if so unsubscribe because we probably lost handle.\r\n            {\r\n               OnKeyPress  -= listener;\r\n               return;\r\n            }\r\n            cb.Call(val);\r\n        }\r\n\r\n        OnKeyPress += listener;\r\n\r\n        return () => OnKeyPress -= listener;\r\n    }\r\n```\r\n\r\nTSX\r\n```\r\n  const [key, setKey] = useState(\"\");\r\n  useEffect(() => {    \r\n    const unsubscribe = Global.Instance.AddKeyPressListener((input: string) => {\r\n      setKey(input);\r\n    });\r\n    // Get current value before hook is called\r\n    const input= Global.Instance.LastKeyPressed;\r\n    setKey(input);\r\n    return () => unsubscribe();\r\n  }, []);\r\n\r\n```","author":{"url":"https://github.com/Muchaszewski","@type":"Person","name":"Muchaszewski"},"datePublished":"2022-12-06T10:56:02Z","url":"https://github.com/ReactUnity/reactunity.github.io/issues/8"}