{"id":6252,"date":"2022-09-02T08:42:45","date_gmt":"2022-09-02T03:12:45","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-how-to-write-an-user-control-for-wpf-xaml-duplicate\/"},"modified":"2022-09-02T08:42:45","modified_gmt":"2022-09-02T03:12:45","slug":"solved-how-to-write-an-user-control-for-wpf-xaml-duplicate","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-how-to-write-an-user-control-for-wpf-xaml-duplicate\/","title":{"rendered":"[Solved] how to write an  user control for WPF XAML [duplicate]"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-68500224\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"68500224\" data-parentid=\"68499748\" data-score=\"1\" data-position-on-page=\"1\" data-highest-scored=\"1\" data-question-has-accepted-highest-score=\"1\" itemprop=\"acceptedAnswer\" itemscope itemtype=\"https:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\"><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"s-prose js-post-body\" itemprop=\"text\">\n<p>I would use a <em>Custom Control<\/em> and not a <em>User Control<\/em> and make the default child a custom DependencyProperty and add to the control&#8217;s content manually<\/p>\n<pre><code>[ContentProperty(\"ConditionalContent\")]\npublic partial class If : ContentControl\n{\n    public If()\n    {\n        Loaded += OnLoad;\n    }\n\n    private void OnLoad(object sender, RoutedEventArgs e)\n    {\n        update();\n    }\n\n    private void update()\n    {\n        Content = Condition ? ConditionalContent : null;\n    }\n\n    \/\/ === component properties\n\n    \/\/ omg, WPF\n    public bool Condition\n    {\n        get { return (bool)GetValue(ConditionProperty); }\n        set { SetValue(ConditionProperty, value); }\n    }\n\n    public static readonly DependencyProperty ConditionProperty = DependencyProperty.Register(\"Condition\", typeof(bool), typeof(If), new PropertyMetadata(OnConditionChangedCallback));\n\n    private static void OnConditionChangedCallback(DependencyObject sender, DependencyPropertyChangedEventArgs e)\n    {\n        if (sender is If s)\n        {\n            s.update();\n        }\n    }\n\n\n\n    public object ConditionalContent\n    {\n        get { return (object)GetValue(ConditionalContentProperty); }\n        set { SetValue(ConditionalContentProperty, value); }\n    }\n\n    public static readonly DependencyProperty ConditionalContentProperty =\n        DependencyProperty.Register(\"ConditionalContent\", typeof(object), typeof(If), new PropertyMetadata(null,OnConditionChangedCallback));\n\n\n}\n<\/code><\/pre>\n<p>and it works like this<\/p>\n<pre><code>&lt;local:If Condition=\"{Binding}\"&gt;\n    sdgdfhsh &lt;!-- or anything else! --&gt;\n&lt;\/local:If&gt;\n<\/code><\/pre>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">4<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved how to write an <If> user control for WPF XAML [duplicate] <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] I would use a Custom Control and not a User Control and make the default child a custom DependencyProperty and add to the control&#8217;s content manually [ContentProperty(&#8220;ConditionalContent&#8221;)] public partial class If : ContentControl { public If() { Loaded += OnLoad; } private void OnLoad(object sender, RoutedEventArgs e) { update(); } private void update() { &#8230; <a title=\"[Solved] how to write an  user control for WPF XAML [duplicate]\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-how-to-write-an-user-control-for-wpf-xaml-duplicate\/\" aria-label=\"More on [Solved] how to write an  user control for WPF XAML [duplicate]\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[324,874,1139],"class_list":["post-6252","post","type-post","status-publish","format-standard","hentry","category-solved","tag-c","tag-wpf","tag-xaml"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>[Solved] how to write an user control for WPF XAML [duplicate] - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-how-to-write-an-user-control-for-wpf-xaml-duplicate\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] how to write an user control for WPF XAML [duplicate] - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] I would use a Custom Control and not a User Control and make the default child a custom DependencyProperty and add to the control&#8217;s content manually [ContentProperty(&quot;ConditionalContent&quot;)] public partial class If : ContentControl { public If() { Loaded += OnLoad; } private void OnLoad(object sender, RoutedEventArgs e) { update(); } private void update() { ... 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