today i'm facing problem "solved" days ago. first facts: visual studio 2013 desginerview
i've got custom usercontrol inherited usercontrol first. time later needed base-class between customcontrol , usercontrol spread virtual functions on controls (all controls should inherit "basecontrol").
so classes like:
public class customcontrol : basecontrol { } public class basecontrol : usercontrol { public virtual bool finished() { return false; } } now if try open customcontrol visual studio designer following error: visual studio cannot open designer file because class within not inherit class can visually designed
some days ago problem occurs under debug-configuration, , fixed after hours using [designtimevisible(false)]-attribute @ basecontrol.
but after moving files project in solution i've got errror again.
winforms usercontrol:
modify code generated designer in customcontrol.designer.cs file:
partial class customcontrol:basecontrol { ... } also, there should .designer.cs file basecontrol, otherwise won't work.
the codebehind basecontrol:
public partial class basecontrol : usercontrol { public basecontrol() { // code generated automatically initializecomponent(); } public virtual bool finished() { return false; } }
wpf usercontrol:
the code basecontrol should located in plain basecontrol.cs file. there shouldn't .xaml or .xaml.cs files basecontrol (this important)
namespace mynamespace { public class basecontrol:usercontrol { //... } } in .xaml.cs file of customcontrol, there should be:
namespace mynamespace { public partial class customcontrol: basecontrol { //.... } } in .xaml file of customcontrol:
<local:basecontrol x:class="mynamespace.customcontrol" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="clr-namespace:mynamespace"> <grid> </grid> </local:basecontrol> and not:
<usercontrol x:class="mynamespace.customcontrol" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"> <grid> </grid> </usercontrol> 