Hey everyone,<\/p>\n
As you all know, all I used to do was code all my stuff in Windows Forms. I’ve decided to switch over to WPF so I’m gently and at my own pace migrating from Windows Forms to WPF.
\nEveryone knows that when you migrate from one thing to another, you’ll always bump into the following problem:<\/p>\n
“I was able to do this before, how am I supposed to do this now? ”<\/p>\n
That has already happend a few times to me while working in WPF.<\/p>\n
One of this issues I recently had, was that in Windows Forms it was easy to iterate over all the controls located within a form or container (GroupBox for example).
\nIn WPF, it obviously didn’t work that way >.<<\/p>\n
<\/p>\n
As an example, the following code in Windows Forms:<\/p>\n
\r\nforeach(Control c in GroupBox1.Controls)\r\n{\r\n\tif(c.GetType() == typeof(TextBox))\r\n\t{\r\n\t\tTextBox txt = (TextBox)c;\r\n\t\ttxt.Clear();\r\n\t}\r\n}\r\n<\/pre>\nThis would clear all textboxes located within GroupBox1.<\/p>\n
Now, when you try to do that in WPF, you’ll notice that the GroupBox doesn’t have a Controls property.<\/p>\n
So I had to put together a little helper that would get all the child controls for me and how deep they’d be nested:<\/p>\n
\r\nclass ChildControls\r\n {\r\n private List<object> lstChildren;\r\n\r\n public List<object> GetChildren(Visual p_vParent, int p_nLevel)\r\n {\r\n if (p_vParent == null)\r\n {\r\n throw new ArgumentNullException(\"Element {0} is null!\", p_vParent.ToString());\r\n }\r\n\r\n this.lstChildren = new List<object>();\r\n\r\n this.GetChildControls(p_vParent, p_nLevel);\r\n\r\n return this.lstChildren;\r\n\r\n }\r\n\r\n private void GetChildControls(Visual p_vParent, int p_nLevel)\r\n {\r\n int nChildCount = VisualTreeHelper.GetChildrenCount(p_vParent);\r\n\r\n for (int i = 0; i <= nChildCount - 1; i++)\r\n {\r\n Visual v = (Visual)VisualTreeHelper.GetChild(p_vParent, i);\r\n \r\n lstChildren.Add((object)v);\r\n\r\n if (VisualTreeHelper.GetChildrenCount(v) > 0)\r\n {\r\n GetChildControls(v, p_nLevel + 1);\r\n }\r\n }\r\n }\r\n }\r\n<\/pre>\nNow with that class, I can simply do the following:<\/p>\n
\r\n ChildControls ccChildren = new ChildControls();\r\n\r\n foreach (object o in ccChildren.GetChildren(GroupBox1, 5))\r\n {\r\n if (o.GetType() == typeof(TextBox))\r\n {\r\n TextBox txt = (TextBox)o;\r\n txt.Text = \"\";\r\n }\r\n }\r\n<\/pre>\nNote that the 5 in “.GetChildren(GroupBox1, 5)” indicates how many levels deep I’d like to check for controls.
\nWhen you have a layout that contains deeply nested XAML code, you can easily increase this number, especially when requesting child controls for top level elements<\/p>\n","protected":false},"excerpt":{"rendered":"
Hey everyone, As you all know, all I used to do was code all my stuff in Windows Forms. I’ve decided to switch over to WPF so I’m gently and at my own pace migrating from Windows Forms to WPF. Everyone knows that when you migrate from one thing to another, you’ll always bump into … Continue reading Looping through child controls in WPF (C#)<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[38],"tags":[],"_links":{"self":[{"href":"https:\/\/dirk.schuermans.me\/index.php?rest_route=\/wp\/v2\/posts\/585"}],"collection":[{"href":"https:\/\/dirk.schuermans.me\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/dirk.schuermans.me\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/dirk.schuermans.me\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/dirk.schuermans.me\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=585"}],"version-history":[{"count":9,"href":"https:\/\/dirk.schuermans.me\/index.php?rest_route=\/wp\/v2\/posts\/585\/revisions"}],"predecessor-version":[{"id":771,"href":"https:\/\/dirk.schuermans.me\/index.php?rest_route=\/wp\/v2\/posts\/585\/revisions\/771"}],"wp:attachment":[{"href":"https:\/\/dirk.schuermans.me\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=585"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dirk.schuermans.me\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=585"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dirk.schuermans.me\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=585"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}