How can I connect xaml and xaml.cs files

C# Problem Overview

I had a VB projected and converted it to C# using online conversion tools. Now the problem is xaml and xaml.cs file do not connect to each other, that is they don't recognize their dependencies (Red area in Fig). Actually it should appear like Window1 Files (Green Area in the image.) How can I achieve this.

Solution Explorer

I am trying my hands on WPF so may be a layman sort of question.

C# Solutions

Solution 1 - C#

This is simple, try to add in project existing items and select the XAML (not .cs, etc.) files in list of formats. In VS2010 thats helps.

Solution 2 - C#

If you cannot get the IDE to do it (Papa John's post), then you can do it by editing the project file.

That information is in the .csproj file (which is an XML file -- you can open it in a text editor, or by right-clicking on it, choosing "unload", and then opening it -- choose reload to load it up as a project again).

Here is the information to look for, you would need to add the "DependentUpon" tag.

<Compile Include="TheFile.xaml.cs">
  <DependentUpon>TheFile.xaml</DependentUpon>
</Compile>

Solution 3 - C#

Easiest Way!!!

I came across the same. I got the way out. Here is how to get the .xaml.cs nested under the .xaml in Solution Explorer:

In Windows File Explorer (outside of Visual Studio), open the folder where the required files are.
Select both files (.xaml and .xaml.cs) together.
Drag it onto your project name in the Solution Explorer.
Its done! :)

Solution 4 - C#

Using a Xamarin PCL Solution:

Go to your PCL folder and open your MySolution.csproj file
There should be several groups of <ItemGroup> tags. One of them declares <EmbeddedResource> tags and another will contain, <Compile> <DependentUpon></DependentUpon></Compile> groups of tags.
For MyPage.xaml and MyPage.xaml.cs files to be linked, you must have a group of xmls that declare your xaml page.

<EmbeddedResource Include="MyPage.xaml">
      <Generator>MSBuild:UpdateDesignTimeXaml</Generator>
      <LogicalName>MyPage.xaml</LogicalName>
</EmbeddedResource>

<Compile Include="MyPage.xaml.cs">
      <DependentUpon>MyPage.xaml</DependentUpon>
</Compile>

Note that if your page is in a folder you should specify that like so:

<Compile Include="Views\MyPage.xaml.cs">
      <DependentUpon>MyPage.xaml</DependentUpon>
</Compile>

<EmbeddedResource Include="Views\MyPage.xaml">
      <Generator>MSBuild:UpdateDesignTimeXaml</Generator>
      <LogicalName>MyPage.xaml</LogicalName>
</EmbeddedResource>

Note that this works with OSX and Windows

Solution 5 - C#

Based on Kyle White's comment on the official Xamarin bug report 55591: .xaml files in .NETStandard library appear twice in solution explorer, I found a simple solution to this problem within the linked .NET Standard sample project by Oren Novotny

Within your .csproj file, add the following <ItemGroup>:

<ItemGroup>
  <Compile Update="**\*.xaml.cs" DependentUpon="%(Filename)" />
  <EmbeddedResource Include="**\*.xaml" SubType="Designer" Generator="MSBuild:UpdateDesignTimeXaml" LogicalName="%(Filename)%(Extension)" />
</ItemGroup>

Afterwards, all xaml files within the project structure will be displayed in the Solution Explorer window automatically - even if you'll ever add new xaml files.

How does this magic work?

The Compile element within the ItemGroup is using wildcards to iterate through all directories, searching for .xaml.cs files and marking them as dependent on the xaml files of the same name. Please note that this works only because the %(Filename) item metadata used for the DependentUpon element contains the left-most file extension, which matches the name of the xaml file by convention. The EmbeddedResource element will include all xaml files to the project, so that they are visible within the Solution Explorer window while marking them as Designer files, and declaring that the UpdateDesignTimeXaml target defined within the Xamarin.Forms NuGet package should be used to generate code from the markup file.

Solution 6 - C#

Using Xamarin Shared Code solution:

Go to you project folder after unloading the shared project
Find the projitems file and edit that adding the DependentUpon tag as described in other answers above.
Save the file
Go back to visual studio and you should get a dialog that allows you to reload all or just open the project again.

Solution 7 - C#

An even easier and faster solution for Xamarin Forms projects, no need to touch csproj file at all, very quick fix.

Make sure you have Show All Files selected for solution explorer - it may be on by default.

Select all affected files
Right click > Exclude from Project
Select the same files again (should be faded out)
Right Click > Include in Project

They should now all be nested correctly and all the changes necessary to the .csproj file will be done.

You may have an InitializeComponent() does not exist in the current context) error after this. If that's the case, the simple fix is..

Select all affected items and change Build Action from Page to Embedded Resource

Solution 8 - C#

If you get the Nested File VS Extension, you can do this by right clicking similarly named files and choosing to "nest automatically" or you can nest manually.

https://marketplace.visualstudio.com/items?itemName=MadsKristensen.FileNesting

Solution 9 - C#

In a Shared Project there is .shproj file instead of a .csproj file and the and items do not exist there. However I found there is also a .projitems file and adding a section there as described above caused the .xaml and .cs files to be linked

Solution 10 - C#

I was able to just restart Visual Studio for Mac 2019 v16.2 and it reconnected my .xaml & .cs files that should've been connected.

If that doesn't work, Hitsa's solution worked for me as well on a separate occasion.

Solution 11 - C#

The usual - Close Visual Studio, delete the vs folder in the root folder of your solution and reopen Visual Studio (2019) just worked for me.

Solution 12 - C#

For VS 2019, you have only to edit .csproj file and eliminate all references to .xaml.cs file es:

<ItemGroup>
    <Folder Include="Models\" />
    <Folder Include="Services\" />
    <Folder Include="ViewModels\" />
  </ItemGroup>

  <ItemGroup>
    <EmbeddedResource Update="Views\MyPage.xaml">
      <LogicalName>MyPage.xaml</LogicalName>
    </EmbeddedResource>
  </ItemGroup>

Content Type	Original Author	Original Content on Stackoverflow
Question	Marshal	View Question on Stackoverflow
Solution 1 - C#	Papa John	View Answer on Stackoverflow
Solution 2 - C#	JMarsch	View Answer on Stackoverflow
Solution 3 - C#	Hitsa	View Answer on Stackoverflow
Solution 4 - C#	Harry	View Answer on Stackoverflow
Solution 5 - C#	Sam del Rö	View Answer on Stackoverflow
Solution 6 - C#	dracosveen	View Answer on Stackoverflow
Solution 7 - C#	Bejasc	View Answer on Stackoverflow
Solution 8 - C#	Kris Coleman	View Answer on Stackoverflow
Solution 9 - C#	john.gleeson	View Answer on Stackoverflow
Solution 10 - C#	Ethan Thompson	View Answer on Stackoverflow
Solution 11 - C#	Rob L	View Answer on Stackoverflow
Solution 12 - C#	Baznr	View Answer on Stackoverflow