I have an odd situation with a user control in VS 2010. The form designer keeps changing my entry and then telling me it does not exist! It compiles and runs the first time, and then if I change something unrelated, it gives me an error in the designer.cs file (Cannot resolve symbol SomeEntry).
private SomeEntry someEntry;
// ...
this.someEntry = new **MyNameSpace**.SomeEntry();
if I remove the MyNameSpace.
this.someEntry = new SomeEntry();
it works, until I make a change again. If I look at the class when the mouse is over the changed designer file, SomeEntry shows SomeEntry.SomeEntry()
instead of MyNameSpace.SomeEntry()
Basically, the definition is something like this:
namespace MyNameSpace
{
public partial class SomeEntry : FormValidatingUserControl
{
public SomeEntry()
{
InitializeComponent();
}
}
}
So, what do I do?
It turns out that I should have posted my code EXACTLY as it appeared, as I am sure someone would have figured this out for me sooner.
The issue was that I was trying to simplify for the post, and changed the names of MyNameSpace and SomeEntry to keep it generic.
The project is something the namespace is something (so far, normal) and there was a generated class something from the entity framework.
To reproduce the problem, I created a new project called WinFormTestX. So, the solution is WinFormTestX and the project WinFormTestX. I added a class called WinFormTestX, but did nothing with it.
namespace WinFormTestX
{
public class WinFormTestX
{
public int ID { get; set; }
}
}
Now, I create a UserControl (UserControl1) and drop a simple button on it. Compile it, and the toolbox adds this control, as expected. Now, I drop it on Form1 and compile it and get an error:
Error 1 The type name 'UserControl1'
does not exist in the type
'WinFormTestX.WinFormTestX' D:\Data\Projects\Temp\WinFormTestX\Form1.Designer.cs 31 51 WinFormTestX
As soon as I right click on the class WinFormTestX and Exclude From Project (or delete it), everything works.
So, just having the class in the project of the same name as the namespace, even when it is not used, causes an issue. Obviously, now that I know the cause, there is a simple way around this. But, is this something that is a "bug" that should be submitted to Microsoft?
I've had stuff like this happen when manually moving a class into a new namespace. If you're not careful, your class can become defined multiple times. For example, there may be a residual designer .cs file that still defines the class in its old namespace or some other .cs/.designer.cs mismatch. In other words, your assembly may contain both a SomeEntry.SomeEntry and MyNameSpace.SomeEntry class.
Check the Visual Studio object browser to see if you have SomeEntry defined in multiple namespaces.
Related
Edit
This bugs me for an almost year. I'll update the answer and add bounty.
I've custom control, which has dependency property
public class Graph : Control
{
public List<Figure> Figures
{
get { return (List<Figure>)GetValue(FiguresProperty); }
set { SetValue(FiguresProperty, value); }
}
public static readonly DependencyProperty FiguresProperty =
DependencyProperty.Register("Figures", typeof(List<Figure>), typeof(Graph),
new PropertyMetadata((d, e) => ((Graph)d).InvalidateVisual()));
...
}
Figure is the base class for all figures:
public abstract class Figure { ... }
public class LineFigure : Figure { ... }
public class XGridFigure : Figure { ... }
public class YGridFigure : Figure { ... }
...
Now look at screenshots below to see the problem: sometimes (after doing a change to xaml in other place) designer goes crazy about it and stop rendering the whole window, throwing exceptions, while code compiles and runs without problem. I can close this xaml (designer) and open it again to make problem go away. But it always reappears.
Question: is there something wrong on my side? Missing attribute? Wrong usage? How can I fix that problem?
Old question
Ugly situation.
I have 2 UserControl. In both hand-made control Graph is used. Graph has property Figures to specify List<Figure>. There are dozens of figures which have Figure as base.
In one UserControl it works fine, in other throws exception
The specified value cannot be assigned to the collection. The following type was expected: "Figure".
And I fail to see a difference what could cause a problem.
Here is problematic one screenshot
And here is working one
Despite of errors project compiles and runs, but if I need to do modification to problematic UserControl, then it's not showing any content (says "Invalid Markup"). Graphs are nearly the same, all 8 errors are shown for to just one UserControl.
What should I do? How to troubleshoot such errors? I exclude (completely) any problem with Graph because it runs without a single problem AND it works without problem for another UserControl. Visual Studio designer problem? Using 2013 Express for Windows Desktop.
Indeed the visual designer does not recognize the inheritance from Figure. One solution is to use IList as the Interface type:
public IList Figures
{
get
{
return (IList)GetValue (FiguresProperty);
}
set
{
SetValue (FiguresProperty, value);
}
}
public static readonly DependencyProperty FiguresProperty =
DependencyProperty.Register ("Figures", typeof (IList), typeof (Graph), new PropertyMetadata (new List<object>()));
That might look like a bit strange (because you give up type safetyness). But have a closer look at the WPF classes. They all do it that way (most likely for good reasons). Or WPF even creates collection classes like PathFigureCollection that implement both IList and IList<PathFigure>.
close the project, restart VS and reopen it. does it still list the errors? visual studio often seems to report "phantom errors", but they usually go away if you close and restart etc.
If the custom control is in the same solution or project, Visual Studio builds it (when it considers it necessary) so it can use the control in the designer.
Sometimes this built/cached version gets out of sync with the code files which causes the Xaml parser/syntax checker to get confused and display those wavy red lines.
I have had success with closing and reopening all designers that use the control but that is pretty annoying to keep on doing. In my experience the most reliable solution is to move the control into a separate solution and project and set a 'proper' reference to the dll.
I had a whole load of these errors in one project.
Eventually I found that the project did not have a reference to System.Xaml.
Adding a reference to System.Xaml removed all of the warnings.
The strange thing is that it didn't cause a runtime problem.
I know a little bit in C# with Winforms, but I am currently working with WPF for the first time.
There's the problem : I created a class file named ConnectDB.cs, who contains a class named ConnectDB with a few methods in it, used to connect to a Database.
In my MainWindow.xaml.cs I need to appeal this class, but it doesn't work ! The compiler says "The name 'ConnectDB' does not exist in the current context". But when I add my ConnectDB class directly in the MainWindow.cs it runs smoothly !
So, basically, my question is : how to use a class from another cs file in WPF ?
(I already tested the same thing with Winforms and it works, so I'm a little bit lost)
if you can not call your class then I think about that :
1* Check if you have the same namespaces
2* Check if your class is public
3* if all Ok then try to Clean and rebuild your solution
public static class MyExtensions
{
public static bool TextBoxIsEmpty(TextBox txtControl, ErrorProvider eP)
{
if (txtControl.Text == string.Empty)
{
eP.SetError(txtControl, "You must Enter something!");
return true;
}
else
{
eP.Clear();
return false;
}
}
}
I use this function all over my project for validating an empty text Box. It works normally until I add one user control to one of my WinForms. In particular, when the data source of the Grid changes, an instance of that User control is added to my form, but I get this error.
Error 129 The call is ambiguous between the following methods or properties: 'DominateVehicle.Class.MyExtensions.TextBoxIsEmpty(System.Windows.Forms.TextBox, System.Windows.Forms.ErrorProvider)' and 'DominateVehicle.Class.MyExtensions.TextBoxIsEmpty(System.Windows.Forms.TextBox, System.Windows.Forms.ErrorProvider)' D: \Vechel_Dominate\a\DominateVehicle\frmDefectClass.cs 30 41 DominateVehicle
I do not know what relationship there is between adding a user control and this error?
If I delete the UserControl, my code does not work and I get an error. What do I do?
I also had this error.
Always when I added a control in my project to one of my forms I couldn't compile any longer because of ambiguous call's to all of my extension methods.
In the end I saw that VS added a reference of my project to the same project, so the compiler got a problem with this. Then it does not help to delete your code, because the reference is still there.
I could solve the problem by removing this reference from my project. Maybe this helps anyone else.
This function is defined on two places. Check that. Compiler does not know which one to call. Find in your solution. There will be two functions of this name.
Sometimes when I'm developing I may prefer to quickly inline classes, interfaces and/or enums when I'm building a fresh design or from within a test fixture. However, I find it inconvenient to interrupt my thought process to create new code files, copy and paste the class/interface/enum written inline to the new file, and all the time it takes to navigate between them.
I'm looking for an extension, macro, or hidden shortcut combo that will automatically create a file for the highlighted or selected inline class/interface/enum, and, if possible, copy the using list so that it can be built (but remove & sort will clean it up later).
I'm open to extensions, macros, or hidden shortcut keys. Suggestions?
Edit #1: ReSharper looks awesome, yes, and it appears to have exactly what I need, but I would like to find a free solution, if it exists, that didn't push me back $200.
Edit #2: After your helpful input, I'm pushing for my dev team to all run the ReSharper trial, and re-evaluate in a few weeks if the value-add is worth it. We want keep our extension use consistent, so I'm hoping we all find it equally worthwhile.
Example: I want to turn this (IExample.cs):
using System.Linq;
public interface IExample
{
}
public class Example : IExample
{
}
public enum ExampleType
{
}
...into these:
IExample.cs:
using System.Linq;
public interface IExample
{
}
Example.cs
using System.Linq;
public class Example : IExample
{
}
ExampleType.cs
using System.Linq;
public enum ExampleType
{
}
The built in refactoring tools do not have a simple way to extract a class to its own file, so the simplest thing to do if you do not have a refactoring tool like Resharper or Refactor! Pro that do have it is to:
Copy the class to memory.
Add a new file with the class name.
Paste the class to the new file.
ReSharper offers the feature Move to another file to match type name, the ALT+Enter shortcut makes your work faster.
Devexpress Refactor!pro can be your solution....in example you posted, refactor! Pro shows a quick action menu at the bottom of the class name that you want to move.
In this Actionmenu there s the "Move to file" option that' s all you need....
EDIT:
Apparently, this method does move the type to its own file but still keeps the relationship with the previous class, so it won't actually change anything other than generate a seperate file. The type will still be nested in the same way.
This is a pretty old question and I just encountered the same issue.
In Visual Studio 2019 (and probably in 2017 as well, though I did not check),
you can select the entire class -> right click -> Quick Actions and Refactoring -> Move Type to its own file.
It correct all references to said type, too.
Very handy!
I am trying to add my own namespace to my xaml file in order to use my own class easily -I guess the reason is this-
I wrote the following code in window tag for this:
xmlns:myns="clr-namespace:LibNameSpace"
Where my window tag also starts with the following definition:
<Window x:Class="LibNameSpace.MainWindow"
I want to use the LibNameSpace:Class1 class, and I was hoping to write myns:Class1 for this. However, that command causes this error:
Undefined CLR namespace. The 'clr-namespace' URI refers to a namespace 'LibNameSpace' that is not included in the assembly.
How can I fix this?
The name LibNameSpace sounds like its a library in another assembly. If this is the case, you must add the name of the assembly:
xmlns:myns="clr-namespace:LibNameSpace;assembly=MyLibAssembly
Update:
The name of the assembly can be found in project-explorer in the properties-screen of the project (of the library-assembly). In general also the file-name of the dll without the dll-suffix represents the assembly name.
Because for me it's not really clear what you want to do, here another try:
If MyLibAssembly is the main namespace of your application and there in you have a Window named MainWindow and a class named Class1 that you want to instantiate in your MainWindow-class:
Make sure, that in Class1 is no
error, the project must
compile without errors. Remove first the
namespace-declaration from the xaml and compile your
project till you have no compilation errors.
Make sure that Class1 is public and
has a paramterless constructor
Make sure that in the code behind
your MainWindow is also in the
MyLibAssembly-namcespace.
Add then the namspace-declaration
xmlns:local="clr-namespace:LibNameSpace
into your xaml. local is generally
used to declare the same namespace as your current element, in your case the window, is in.
Insert your Class1 with the
<local:Class1/> -tag in the xaml. If Class1 does not derive from FrameworkElement or a higher level control, you must add it into the resources-section of your window. If this is true, give it a key. <local:Class1 x:Key="KeyToYourClass"/>
Maybe vs is out of sync. Click in the solution-explorer on the root-node Clean Solution and then Rebuild Solution. Maybe that helps.
I hope this helped. If not, try to reformat your question (use the code-symbol to make the question more readable and try to rephrase to make more clear what your desire is).
Use Intellisense. In my case one space mattered. instead of
xmlns:local="clr-namespace:DataAccess;assembly=DataAccess"
I hand typed
xmlns:local="clr-namespace:DataAccess; assembly=DataAccess"
Notice the space after ';'. This made the difference. So use visual studio Intellisense and it will render you correct xaml markup.
I found this answer while I was struggling with problems in Windows 8. I was trying to use a User Control and I had several errors. The last ones where:
Error 9 Cannot add 'ScrollControl' into the collection property 'Children', type must be 'UIElement'
and:
Error 10 Unknown type 'ScrollControl' in XML namespace 'clr-namespace:EventTests.Controls;assembly=EventTests, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'
ScrollControl is my user control.
I ended up replacing this:
xmlns:Controls="clr-namespace:EventTests.Controls"
For this:
xmlns:Controls="using:EventTests.Controls"
I hope this saves the time I spent with this issue.