CODEWITHSUNDEEP
asp.netasp.net-coreasp.net-core-mvc
jao
jao

Reputation: 18610

Duplicate 'Content' items were included. The .NET SDK includes 'Content' items from your project directory by default

Whenever I add a javascript or css file to my asp.net core project and I execute dotnet run in my bash terminal, I get the following error:

/usr/share/dotnet/sdk/1.0.1/Sdks/Microsoft.NET.Sdk/build/Microsoft

.NET.Sdk.DefaultItems.targets(188,5): error : Duplicate 'Content' items were included. The .NET SDK includes 'Content' items from your project directory by default. You can either remove these items from your project file, or set the 'EnableDefaultContentItems' property to 'false' if you want to explicitly include them in your project file. For more information, see https://aka.ms/sdkimplicititems. The duplicate items were: 'wwwroot/css/BasicQuotation.css'; 'wwwroot/js/BasicQuotation.js' [/mnt/c/Dev/myproject/MyProject/MyProject.csproj]

The build failed. Please fix the build errors and run again.

I can fix this by removing the ItemGroup from my csproj file, but I don't think that's very productive.

This happens in the default Visual Studio 2017 ASP.NET Core Web Application (.NET Core) template. I add the files to my project by right clicking the wwwroot > js folder and then select Add > New Item > JavaScript File

This is my .csproj file:

<Project Sdk="Microsoft.NET.Sdk.Web">

  <PropertyGroup>
    <TargetFramework>netcoreapp1.1</TargetFramework>
  </PropertyGroup>

  <PropertyGroup>
    <PackageTargetFallback>$(PackageTargetFallback);portable-net45+win8+wp8+wpa81;</PackageTargetFallback>
  </PropertyGroup>

  <PropertyGroup>
    <UserSecretsId>aspnet-MyProject-7e1906d8-5dbd-469a-b237-d7a563081253</UserSecretsId>
  </PropertyGroup>

  <ItemGroup>
    <Compile Remove="wwwroot\lib\jquery-validation\**" />
    <Content Remove="wwwroot\lib\jquery-validation\**" />
    <EmbeddedResource Remove="wwwroot\lib\jquery-validation\**" />
    <None Remove="wwwroot\lib\jquery-validation\**" />
  </ItemGroup>

  <ItemGroup>
    <Content Include="wwwroot\css\BasicQuotation.css" />
    <Content Include="wwwroot\js\BasicQuotation.js" />
  </ItemGroup>
  <ItemGroup>
    <PackageReference Include="Microsoft.AspNetCore" Version="1.1.1" />
    <PackageReference Include="Microsoft.AspNetCore.Authentication.Cookies" Version="1.1.1" />
    <PackageReference Include="Microsoft.AspNetCore.Identity.EntityFrameworkCore" Version="1.1.1" />
    <PackageReference Include="Microsoft.AspNetCore.Mvc" Version="1.1.2" />
    <PackageReference Include="Microsoft.AspNetCore.StaticFiles" Version="1.1.1" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="1.1.1" PrivateAssets="All" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="1.1.1" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer.Design" Version="1.1.1" PrivateAssets="All" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="1.1.0" PrivateAssets="All" />
    <PackageReference Include="Microsoft.Extensions.Configuration.UserSecrets" Version="1.1.1" />
    <PackageReference Include="Microsoft.Extensions.Logging.Debug" Version="1.1.1" />
    <PackageReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Design" Version="1.1.0" PrivateAssets="All" />
  </ItemGroup>
  <ItemGroup>
    <DotNetCliToolReference Include="Microsoft.EntityFrameworkCore.Tools.DotNet" Version="1.0.0" />
    <DotNetCliToolReference Include="Microsoft.Extensions.SecretManager.Tools" Version="1.0.0" />
    <DotNetCliToolReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Tools" Version="1.0.0" />
  </ItemGroup>
  <ItemGroup>
    <Folder Include="Data\Commands\" />
    <Folder Include="Data\Queries\" />
    <Folder Include="wwwroot\images\" />
  </ItemGroup>

</Project>

Upvotes: 186

Views: 112403

Answers (25)

Dzhefer
Dzhefer

Reputation: 2397

  1. Click 'Show All Files' in Solution Explorer
  2. Right-click over 'wwwroot' select 'Exclude From Project'
  3. Right-click over 'wwwroot' select 'Include in Project'

Upvotes: 237

Daj Shung
Daj Shung

Reputation: 47

Helped me to remove this (old) line from my csProj-file:

''' < PackageReference Include="Microsoft.NET.Sdk.Razor" Version="3.1.32" / > '''

Upvotes: 1

Michael12345
Michael12345

Reputation: 2667

We just had this error unexpectedly bring down our Azure DevOps pipeline for about 7 days. Although it's been well documented during the last 6 or so years, none of the obvious fixes e.g. EnableDefaultContentItems = False or removing duplicate <content> entries from our project file (we didn't have any) worked for us.

Our Azure DevOps pipeline uses the latest Windows image for building.

pool:
  vmImage: 'windows-latest'

We identified that image used for building had been automatically upgraded, which triggered the problem. The last working build showed in the Initialize job log:

Image: windows-2022
Version: 20231029.1.0

The first failing build showed:

Image: windows-2022
Version: 20231115.2.0

Something in the the new VS/MSBuild versions caused it to incorrectly detect duplicate content items.

Through the process of elimination, we found this evidently unneeded package reference in the *.csproj file was the culprit:

<PackageReference Include="Microsoft.NET.Sdk.Razor" Version="3.1.24" />

Removed this, and the problem went away.

Upvotes: 2

Chr
Chr

Reputation: 1

add Global.json

{ "sdk": {"version" : "6.0.320"} }

Mention the target frame work that you need. to the root folder where the sln file is.

Upvotes: 0

James Westgate
James Westgate

Reputation: 11444

I had renamed one of my class files in Visual Studio for Mac which I could see the edits for when checking the git changes for the project file. Removing the file and adding it back to the project fixed the problem.

Upvotes: 0

NoWhereToBeSeen
NoWhereToBeSeen

Reputation: 1444

for .net core 6.0 this solved:

add to .csproj file

 <ItemGroup>
   <Content Update="wwwroot\**\*">
     <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
   </Content>
 </ItemGroup>

Upvotes: 1

sbeaudoin
sbeaudoin

Reputation: 158

It happened to me on a new WinUI project in .Net 6 only when I referenced an old WinUI component. I solved it and many other unsolvable errors (InitalizeComponent not found for example) by doing the following on the old WinUI component :

  1. Remove the following packages

enter image description here

  1. Replace it with :

enter image description here

Upvotes: 0

Tam Bui
Tam Bui

Reputation: 3048

All of the answers that were written before me did not resolve the 'Duplicate' errors for me, even though I had taken the due diligence to ensure their recommended procedures were followed.

For me, the 'Duplicate content' issue occurred when I tried to upgrade my WinUI 3 Application's SDK from Windows App SDK 0.8 to 1.0 in the Nuget Package Manager. When I did this, my project began to produce this error on every compile, and I tried to do the Exclude/Include methods that other suggested, but to no avail.

It took me about eight hours to find the culprit, which was a reference to another WinUI library project that I still had on Windows App SDK 0.8. Once I upgraded the other WinUI library project to SDK 1.0, this error went away.

Leaving this answer here in case it helps anyone else.

Upvotes: 1

Chris
Chris

Reputation: 377

So what worked for me was clicking on the file in question in the Solution Explorer and choosing "Exclude from Project". Then re-add it back using "Include in Project".

Upvotes: 4

Adnan
Adnan

Reputation: 1282

I'm just getting started and I had this error when I tried copying a wwwroot folder from a Web Application template to a project created with an API template. removing bootstrap solved it for me, which is fine because I just need jquery.

Upvotes: 0

Duy Hoang
Duy Hoang

Reputation: 119

My case I is disable both below default items.

<EnableDefaultContentItems>false</EnableDefaultContentItems>
<EnableDefaultItems>false</EnableDefaultItems>

Upvotes: 3

Razvan
Razvan

Reputation: 15

I had the same problem with only a file, and all others were working (all my templates were stored directly in wwwroot/content). The project was not created by me so I don't know many details.

The problem was fixed by renaming back and forth the file with the issue:

MyTemplate.html -- renamed --> MyTemplate2.html -- renamed --> MyTemplate.html

Note: At the first rename I got an error with something along the lines of "content configuration not found", but the second rename worked without issues.

After this I was able to compile the project successfully.

Upvotes: 0

wtf512
wtf512

Reputation: 4718

It happend when I upgrade my project from .NET Core 1.X to 2.0 just now. Here is my solution.

  • Open xxx.csproj, or right click project
  • Unload Project
  • Edit xxx.csproj.

Then remove ItemGroup items start with <Content Include = "wwwroot\xxxxx"

Upvotes: 17

Razvan Dumitru
Razvan Dumitru

Reputation: 12452

.NET Core Projects

If you are in a class library, probably you'll need to remove all Compile/Content elements from your csproj as those are included automatically. 

<Project Sdk="Microsoft.NET.Sdk">    
  <PropertyGroup>
    <TargetFramework>netcoreapp2.0</TargetFramework>
  </PropertyGroup>
  <!-- NEEDED -->
  <ItemGroup>
    <ProjectReference />
    <ProjectReference />
  </ItemGroup>
  <!-- NOT NEEDED -->
  <ItemGroup>
   <Compile Include="Models\ExampleClass.cs" />
   <Content ... />
  </ItemGroup>
</Project>

Upvotes: 5

Lost_In_Library
Lost_In_Library

Reputation: 3483

I found a different proper solution.

  1. Right click on your mvc project and click Edit csproj.
  2. If you are adding files under wwwroot, just move them to a folder under wwwroot, let's say it "theme"

And delete all content tags in csproj file if their exists, an example;

<Content Include="wwwroot\theme\favicon.ico" />
<Content Include="wwwroot\theme\fonts\cyrillic-ext400.woff2" />
<Content Include="wwwroot\theme\fonts\cyrillic-ext700.woff2" />

And only add this;

  <ItemGroup>
    <Folder Include="wwwroot\theme\" />
  </ItemGroup>

So, csproj file should be look like this;

    <Project Sdk="Microsoft.NET.Sdk.Web">

      <PropertyGroup>
        <TargetFramework>netcoreapp1.1</TargetFramework>
      </PropertyGroup>

      <PropertyGroup>
        <PackageTargetFallback>$(PackageTargetFallback);portable-net45+win8+wp8+wpa81;</PackageTargetFallback>
      </PropertyGroup>

      <ItemGroup>
        <Folder Include="wwwroot\theme\" />
      </ItemGroup>
      <ItemGroup>
        <PackageReference Include="Microsoft.ApplicationInsights.AspNetCore" Version="2.0.0" />
...

With that way, I think you are adding all files under theme folder. So not include them one by one which occours some erros.

Upvotes: 1

anakod
anakod

Reputation: 127

I think what disabling "EnableDefaultContentItems" isn't the best option. Manual cs-Proj file editing also isn't the good idea at all.

So for our build server pipeline, we wrote very small tool what will remove all duplicated entries automatically: dotnet-csproj-cleaner

We run it under Docker as the first build step in our continuous integration pipeline.

Upvotes: 0

Dmitry
Dmitry

Reputation: 16795

As link says, you can disable this behavior (auto-include) and include all content explicitly by adding this into your csproj file:

<PropertyGroup>
    <EnableDefaultContentItems>false</EnableDefaultContentItems>
</PropertyGroup>

Upvotes: 18

revobtz
revobtz

Reputation: 616

Excluding and Including back the folders that have duplicates error worked for me! Hope this helps someone else!

Upvotes: 0

Pinski
Pinski

Reputation: 2647

So I ran into this same issue. I didn't want to turn off DefaultCompileItems because I knew that wouldn't "fix" the problem. So I unloaded my project and opened the .csproj file in text mode in Visual Studio and saw this.

<ItemGroup>
    <Content Include="wwwroot\css\custom-bootstrap-navbar.css" />
    <Content Include="wwwroot\images\friends-eating\image1.jpg" />
    <Content Include="wwwroot\images\friends-eating\image2.jpg" />
    <Content Include="wwwroot\images\friends-eating\image3.jpg" />
</ItemGroup>
<ItemGroup>
    <Folder Include="wwwroot\images\friends-eating\" />
</ItemGroup>

When I commented out the first ItemGroup block, it worked. What I assume is happening is that the project is adding the entire \images\friends-eating\ folder and then adding each individual image, causing a duplication.

As far as the custom css and js, the project automatically adds wwwroot\css and wwwroot\js so if you have an individual file added (like wwwroot\css\custom-bootstrap-navbar.css) it'll count as a duplicate.

Upvotes: 129

Mostafiz
Mostafiz

Reputation: 7352

Actually, Asp.net core automatically include content from wwwroot\css\ , wwwroot\js\ and wwwroot\lib\ location, so despite this if your csproj file explicitly include content from those directories then those content will be duplicated so removing content from you csproj file is the better way to get rid of this error. So remove below content-

  <ItemGroup>
    <Compile Remove="wwwroot\lib\jquery-validation\**" />
    <Content Remove="wwwroot\lib\jquery-validation\**" />
    <EmbeddedResource Remove="wwwroot\lib\jquery-validation\**" />
    <None Remove="wwwroot\lib\jquery-validation\**" />   
 </ItemGroup>

  <ItemGroup>
    <Content Include="wwwroot\css\BasicQuotation.css" />
    <Content Include="wwwroot\js\BasicQuotation.js" />   
  </ItemGroup>

Upvotes: 3

Alex Freund
Alex Freund

Reputation: 31

In my case, I solved this by deleting all files from the wwwroot-Directory in VS. Unload and reload the Project. Copy all files back in with VS. Done

Upvotes: 3

Kyriacos
Kyriacos

Reputation: 93

Under Visual Studio 2017 15.3, with .NET Core 2.0, EnableDefaultCompileItems did not work for me.

I needed to add this to my .csproj

  <PropertyGroup>
    <EnableDefaultContentItems>false</EnableDefaultContentItems>
  </PropertyGroup>

Upvotes: 2

Grandizer
Grandizer

Reputation: 3025

My issues was close but not the exact same. My error was this:

C:\Program Files\dotnet\sdk\2.0.0-preview2-006497\Sdks\Microsoft.NET.Sdk\build\Microsoft.NET.Sdk.DefaultItems.targets(285,5): error : Duplicate 'Content' items were included. The .NET SDK includes 'Content' items from your project directory by default. You can either remove these items from your project file, or set the 'EnableDefaultContentItems' property to 'false' if you want to explicitly include them in your project file. For more information, see https://aka.ms/sdkimplicititems. The duplicate items were: 'wwwroot\js\KOBindings.js'; 'wwwroot\js\KOPleaseWait.js'; 'wwwroot\js\ProjectTime\Add.js'; 'wwwroot\js\TimeAdmin\Invoice.js'; 'wwwroot\js\TimeAdmin\PayPeriodTotals.js' [C:\Avantia Projects\Time Card\avantia-timesheet\Solution\Almanac\Almanac.csproj]

If I did this:

<EnableDefaultContentItems>false</EnableDefaultContentItems>

It would not compile as all of the sudden Areas would not be recognized.

My solution, seems odd, but the message is telling me so, there were duplicate files:

The duplicate items were: 'wwwroot\js\KOBindings.js'; 'wwwroot\js\KOPleaseWait.js'; 'wwwroot\js\ProjectTime\Add.js'; 'wwwroot\js\TimeAdmin\Invoice.js'; 'wwwroot\js\TimeAdmin\PayPeriodTotals.js'

Looking at my .csproj file:

<ItemGroup>
  <Content Include="pdf.js" />
  <Content Include="wwwroot\js\package.json" />
  <Content Include="wwwroot\js\pdf.js" />
  <Content Include="wwwroot\js\KOBindings.js" />
  <Content Include="wwwroot\js\KOPleaseWait.js" />
  <Content Include="wwwroot\js\ProjectTime\Add.js" />
  <Content Include="wwwroot\js\TimeAdmin\Invoice.js" />
  <Content Include="wwwroot\js\TimeAdmin\PayPeriodTotals.js" />
</ItemGroup>

This was the ONLY location within the entire project where these files were references (aside from where they were loaded.) So the phrase duplicate does not make any sense to me. However, commenting those files out as such, took care of my problem:

<ItemGroup>
  <Content Include="pdf.js" />
  <Content Include="wwwroot\js\package.json" />
  <Content Include="wwwroot\js\pdf.js" />
  <!--
    <Content Include="wwwroot\js\KOBindings.js" />
    <Content Include="wwwroot\js\KOPleaseWait.js" />
    <Content Include="wwwroot\js\ProjectTime\Add.js" />
    <Content Include="wwwroot\js\TimeAdmin\Invoice.js" />
    <Content Include="wwwroot\js\TimeAdmin\PayPeriodTotals.js" />
  -->
</ItemGroup>

I assume this has something to do with the 2.0.0-preview2-006497 that I recently installed.

Also, this link mentions talks about globs. But does not tell me where that is. It talks about SDKs and such. Yet the answer was my custom .js files. That link needs to be updated or expanded on IMHO. Hope this helps someone.

Upvotes: 10

Sith2021
Sith2021

Reputation: 3716

This worked in my case:

 <PropertyGroup>
    ...
    <EnableDefaultContentItems>false</EnableDefaultContentItems>
  </PropertyGroup>

Upvotes: 37

Sam
Sam

Reputation: 603

Not that I can see it in your example above, to help other SO searchers..

You can also get this error when you have the same file listed twice in <Content Include="xxx" /> elements in your csproj file.

Remove the duplicate and rebuild.

Upvotes: 3

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