I am trying to replicate this LiveCharts GeoMap in WPF but having an issue with the source file of my xml map :-
https://lvcharts.net/App/examples/v1/wpf/GeoHeatMap
I can produce it fine under WinForms but need to create a working version under WPF, if anyone can assist or point me in the right direction, I’m sure it’s something obvious that I’m missing?
The error I get states that the source path for my xml file doesn’t exist, when it clearly does.
If I follow the example, I create a user control, copy in the xaml plus the code behind, as per the website, then in my main window xaml, make reference to the user control. It’s at this point that it can’t load my main window as it can’t find the source file that I have referenced in my user control. In winforms I can reference it using source=#“c:\temp\world.xml” in code behind but cant do that in the xaml either. Where am I going wrong! Thanks
I had the same issue. It seems as if the NuGet package is outdated (2017).
Try to clone the LiveCharts repository and build it yourself.
In the properties of the XML file:
set Compile Action to none
In the Copy to directory:
set it to Copy Always
My Visual Studio is in Portuguese, but I think you'll get the idea.
If you're interested, there are detailed maps for each country/region; go to https://github.com/Live-Charts/Live-Maps.
I'm new to WPF.
I'm trying to create a WPF application with WPF User Control Library.
But when I try to build or run the project I'm getting the following errors.
I have added the reference to the starting project.
The name "HoverButton" does not exist in the namespace "clr-namespace:HomeSchool_KinectControls;assembly=HomeSchool_KinectControls;"
When I remove the Canves and other elements inside it and build, It successfully built. But when I try to use the HoverButton the error is appearing again and the project is not getting build.
I have seen it's kinda bug in the VS and I tried following:
Restarting VS
Change the Targeting Build Platform
And it doesn't work.
Please help me to find a solution.
From your code it is seen that you're trying to access the Hoverbutton from a certain library.
It is not possible to access a library without adding a reference to it.Right Click on References under the solution explorer and select Add reference. Now browse to the required library or select it if it is in GAC. It will solve your issue.
I am creating a windows form application in managed C++. To add a custom user control either one can create a new project or add CLR User control to same project. When I add a user control to same project it builds and shows control in toolbar. When I drag and drop it onto my main UI it throws up error.
"Failed to load toolbox item, It will be removed from Toolbox".
There is no error if I create a separate project under same solution and compile control as a DLL. Is there a way I can add a custom user control to same project and use it.
Also I looked up similar question on the topc but none of them has helped me. I have checked the files and I am building the project as Win32 and there is no way control being separately built as x64.
Had same problem after one or both of renaming project or/and changing platform, most posted "solutions" provided to other people asking the same question didn't seem to work.
What did work for me was to go into the project folder and delete the obj folder, and just to be safe the bin folder too, then build again. (Seems the so called Build->Clean menu item only does half of the required work.)
This seems like it should be pretty simple but I can't seem to make it happen. Lets say I have an existing project with a user control named uc1. I would like to use this user control in another project. I right-click the project name in the solution explorer and select add>existing item, change the drop down to all files and select the files uc1.xaml and uc1.xaml.vb. This of course adds the files to the project but there is no correlation between the xaml and the code behind file and there is no way to use the control. What is the proper way of doing this?
Reed's answer is a good architectural one. If you plan on creating a control that you will reuse in many projects then it's best to use a control library.
Your original question is valid in some situations though. Say you have some source code from the Internet that you've unzipped to your drive. This project contains a .XAML file and its linked .vb file that you want to add to a project.
As you seen, the Visual Studio Solution Explorer doesn't link the files when adding with the "Add Item" dialog. I think this is a bug. I find that if I reload the project, the affiliation is added.
Here's a workaround I use. I drag the files from Windows Explorer /File Explorer onto the project in Solution Explorer. That works correctly the first time.
This of course adds the files to the project but there is no correlation between the xaml and the code behind file and there is no way to use the control. What is the proper way of doing this?
Normally, you'd add a reference to the other project, and use the UserControl directly.
This allows you to build a single project with your UserControl, and use the resulting assembly (DLL) in multiple projects without duplicating the code.
If you want to reuse your user controls you need to create a new project and choose "Class Library" from the list of available projects. When compiled this class library can easily be used by any number of other projects and solutions simply by adding a reference to compiled DLL created when you build this class library.
Edit: As mentioned in other answer it's "WPF UserControl Library", not simple "Class Library"...
You just need to add the .xaml file and VS should auto add the code behind(nested). I've seen this not work a few times and as #Walt Ritscher said this is probably a bug.
I found simply restarting Visual Studio and reloading my solution worked.
I am using using VS2010 and if I have a form open in designer mode and run my application the designer tab will no longer show the form designer but instead an error will be displayed (and it is only fixed by restarting the IDE) saying:
"To prevent possible data loss before loading the designer, the
following errors must be resolved:"
1 Error:
"The designer could not be shown for this file because none of the
classes within it can be designed. The designer inspected the
following classes in the file: ##### --- The base class ##### could
not be loaded. Ensure the assembly has been referenced and that all
projects have been built"
I then shows the following call stack:
at System.ComponentModel.Design.Serialization.CodeDomDesignerLoader.EnsureDocument(IDesignerSerializationManager manager)
at System.ComponentModel.Design.Serialization.CodeDomDesignerLoader.PerformLoad(IDesignerSerializationManager manager)
at Microsoft.VisualStudio.Design.Serialization.CodeDom.VSCodeDomDesignerLoader.PerformLoad(IDesignerSerializationManager serializationManager)
at System.ComponentModel.Design.Serialization.BasicDesignerLoader.BeginLoad(IDesignerLoaderHost host)
Any help is greatly appreciated this is really annoying.
Thanks,
Joel.
I get this visual studio bug too now and then, and I deeply ignore the error text, instead I do the following:
Close the Design-tab
Reopens the Design mode by double click in Solution Explorer, or by right clicking Source code tab and select View Designer
Suddenly everything works again!
If not helping, you may have to change bullet 2 into:
Close and restart Visual Studio.
Maybe this can help you out.
I usually close the visual form, rebuild the solution, right-click then select "view designer" in the form code.
Very, very annoying. I am thinking of dropping back to VS2008.
Close the form. Clean the solution. Rebuild the solution. Reopen the form. Worked for me when nothing else would.
I had this same issue and I was able to resolve this by creating new project and then compiled and run the project and then I imported all the files and ran the project again and automatically it was working again did nothing extra.
I'm able to avoid restarting VS by doing the following
Add a new user control
Drag and drop some of your custom user controls on to it (If it gives you an error, build the solution again).
Reopen your control.
In my case, I have a winforms project with several custom controls that are used by other custom controls. Whenever I open some of those custom controls, I get a the "The base class ..." error. Adding a new custom control, building the project and then adding some custom controls from my project to the new custom control allowed me to open the custom controls that were giving me the "The base class ..." error.
UPDATE: I think I found the problem. My controls were not 'added' properly to the csproj file. In the csproj file, the files for partial classes of UI controls/components need the 'DependentUpon' attribute.
E.x.:
before:
<Compile Include="Windows\Forms\DataGridView.cs">
<SubType>Component</SubType>
</Compile>
<Compile Include="Windows\Forms\DataGridView.Designer.cs" />
after:
<Compile Include="Windows\Forms\DataGridView.cs">
<SubType>Component</SubType>
</Compile>
<Compile Include="Windows\Forms\DataGridView.Designer.cs">
<DependentUpon>DataGridView.cs</DependentUpon>
</Compile>
I had a situation where a custom user control appeared to be creating the error (not sure why) so I removed references to the user control from the form and the error went away.
It seems that after installing SP1 the problem has gone away.
Thanks for your help everyone.
I had the same problem using A control With Generics
MvpUserControl<Presenter,IViewMode> : UserControl
what I do it's Remove the Reference and Add again, Clean and Rebuild the Solution I Hope this can be useful for anybody else
I had the same problem with VS2010 SP1. Finally using Windows Update I saw some updates for Visual Studio and .Net, I installed them and is not happening any more.
Old post, but for those whom may find this...
Just ran in to this error and for me it was relatively simple fix.
Found that it may have something to do with the names of your classes, and renaming the problematic class to a higher order. That is the alphabetical order it appears in the assembly (Where A is higher than Z).
MSDN Article
Good luck.
This error occur if the Form class is not a first class in the file, for example if there is some helper class at the beginning of the file.
To solve this issue, move all other classes except Form class to the bottom of the file.
Don't code in Form1.Designer.cs. Move your logic to Form1.cs (hit F7 on Form1.cs [Design] tab).
"In the project file (.vcxproj), locate the entry for the target
Framework version. For example, if your project is designed to use the
.NET Framework 4.5, locate
v4.5 in the
element of the element. "
(Microsoft)
In my case the "v4.5" didn't exist so I add it, and everything is good now.
I tried clean solution and re-build solution and worked for me.
Hope this help!
This solution works fine, please follow these steps below to solve your problem:
Check the reference if load correctly
Clean the solution and rebuild again
Clean the project and rebuild again
Clean your project and open it again
I was login as administrator in visual studio . I just close my visual studio and again open it without run as administrator and my problem is solved
I ran into this today after upgrading VS2019. I went to properties, configuration tab, and set the projects to Configuration = Debug, Platform = Any CPU. Then it worked.
I faced this issue.
To prevent possible data loss before loading the designer, the following errors must be resolved:
I found solution for this problem:
Close all open tabs, and refresh (sync active documents) the solution.
For more information, you can see this video : https://youtu.be/Q3x2HBd7BDs