{"id":6723,"date":"2024-03-14T04:36:49","date_gmt":"2024-03-14T04:36:49","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-to-add-custom-parameters-to-an-event-handler-in-c\/"},"modified":"2025-08-02T07:16:08","modified_gmt":"2025-08-02T07:16:08","slug":"how-to-add-custom-parameters-to-an-event-handler-in-c","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-to-add-custom-parameters-to-an-event-handler-in-c\/","title":{"rendered":"Custom Parameters in C# Event Handlers"},"content":{"rendered":"<p>In C#, you can add custom parameters in an EventHandler by creating a custom EventArgs class. Here is an example:<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">using<\/span> System;\r\n\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title\">CustomEventArgs<\/span> : <span class=\"hljs-title\">EventArgs<\/span>\r\n{\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-built_in\">string<\/span> CustomParameter { <span class=\"hljs-keyword\">get<\/span>; <span class=\"hljs-keyword\">set<\/span>; }\r\n\r\n    <span class=\"hljs-function\"><span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-title\">CustomEventArgs<\/span>(<span class=\"hljs-params\"><span class=\"hljs-built_in\">string<\/span> customParameter<\/span>)<\/span>\r\n    {\r\n        CustomParameter = customParameter;\r\n    }\r\n}\r\n\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title\">MyClass<\/span>\r\n{\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">event<\/span> EventHandler&lt;CustomEventArgs&gt; CustomEvent;\r\n\r\n    <span class=\"hljs-function\"><span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title\">OnCustomEvent<\/span>(<span class=\"hljs-params\"><span class=\"hljs-built_in\">string<\/span> customParameter<\/span>)<\/span>\r\n    {\r\n        CustomEvent?.Invoke(<span class=\"hljs-keyword\">this<\/span>, <span class=\"hljs-keyword\">new<\/span> CustomEventArgs(customParameter));\r\n    }\r\n}\r\n\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title\">Program<\/span>\r\n{\r\n    <span class=\"hljs-function\"><span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title\">Main<\/span>()<\/span>\r\n    {\r\n        MyClass myClass = <span class=\"hljs-keyword\">new<\/span> MyClass();\r\n        myClass.CustomEvent += HandleCustomEvent;\r\n\r\n        myClass.OnCustomEvent(<span class=\"hljs-string\">\"Hello, World!\"<\/span>);\r\n    }\r\n\r\n    <span class=\"hljs-function\"><span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title\">HandleCustomEvent<\/span>(<span class=\"hljs-params\"><span class=\"hljs-built_in\">object<\/span> sender, CustomEventArgs e<\/span>)<\/span>\r\n    {\r\n        Console.WriteLine(<span class=\"hljs-string\">\"Custom Event Handler invoked with parameter: \"<\/span> + e.CustomParameter);\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>In the example above, a CustomEventArgs class was custom-defined with a CustomParameter property for storing custom parameters. Then, in the MyClass class, an EventHandler event was declared with its generic parameter specified as CustomEventArgs. When the event is triggered, a CustomEventArgs object is created using new CustomEventArgs(customParameter) and passed to the event&#8217;s triggering method, Invoke. In the event handler HandleCustomEvent, the passed custom parameter can be accessed through e.CustomParameter.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In C#, you can add custom parameters in an EventHandler by creating a custom EventArgs class. Here is an example: using System; public class CustomEventArgs : EventArgs { public string CustomParameter { get; set; } public CustomEventArgs(string customParameter) { CustomParameter = customParameter; } } public class MyClass { public event EventHandler&lt;CustomEventArgs&gt; CustomEvent; public void OnCustomEvent(string [&hellip;]<\/p>\n","protected":false},"author":14,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[274,4524,381,8295,8294],"class_list":["post-6723","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-c","tag-c-events","tag-c-programming","tag-custom-eventargs","tag-event-handlers"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Custom Parameters in C# Event Handlers - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Learn how to add custom parameters to C# event handlers with custom EventArgs class. 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