Could not resolve this reference Could not locate the assembly

Question

Everytime I build my solution  I get this error message      Warning      3      Could not resolve this reference  Could not locate the   assembly  StandardClassLibrary  Version 1 0 0 0  Culture neutral    processorArchitecture MSIL   Check to make sure the assembly exists on   disk  If this reference is required by your code  you may get   compilation errors       StandardClassLibrary   So my application has a number of projects of which StandardClassLibrary is one  The above message is a warning and as far as I can tell it does NOT have an impact on my solution   But I would rather it not be there  just in case

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in my case  it happened because of  net framework version miss match with MySQL connector library  when I updated my  NET version  every thing worked smooth  http   net-informations com q faq mysql html    text Add 20Reference Library 20in 20your 20C 23 20project

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in 2020  this behavior still present with VS2019   even if I clean projects from the solution explorer in VS2019  this not solves the problem   The solution that worked for me was to open the folder of the project  and manually remove the  bin and  obj directories

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If anyone face this issue with some nuget packages  you can fix that by reinstalling the packages using the Package Manager Console   Update-Package -reinstall

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If the project is check out to different PC through team foundation server with different location of same library file  there will be no yellow icon mark in Reference but when change to Release build and build the project  it will give an error  Just like what  C Evenhuis said  it will use back old one in previous build  eg  Debug build  so I didn t notice the mistake   Now I know it is a bad habit to put library files in different location on different PC   Just need to delete the reference and re-add the same reference from correct location

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Check if your project files are read-only  Remove the read-only property by right clicking on the project folder and select properties  In the properties screen remove the read-only checkbox  I came across the same problem  and this solved it for me

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I had faced similar linker issues while adding a NuGet package into the iOS project  in Xamarin forms project   We had earlier provided the additional mtouch argument in the build configurations like this -dlsym false -cxx  -v -v -v -v -gcc flags After removing -dlsym false from the configuration  the issues got resolved for me

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This confused me for a while until I worked out that the dependencies of the various projects in the solution had been messed up  Get that straight and naturally your assembly appears in the right place

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I had this issue after VS mac updation  iOS sdk was  updated  I was referring the ios dll in project folder  The version number in the hintpath was changed  Earlier   lt Reference Include  quot Xamarin iOS quot  gt           lt HintPath gt                         Library Frameworks Xamarin iOS framework Versions 13 18 2 1 lib mono Xamarin iOS Xamarin iOS dll lt  HintPath gt       lt  Reference gt       lt Reference Include  quot Xamarin iOS quot  gt         lt HintPath gt                      Library Frameworks Xamarin iOS framework Versions 13 18 1 31 lib mono Xamarin iOS Xamarin iOS dll lt  HintPath gt       lt  Reference gt       lt Reference Include  quot Xamarin iOS quot  gt            lt HintPath gt                      Library Frameworks Xamarin iOS framework Versions 13 18 3 2 lib mono Xamarin iOS Xamarin iOS dll lt  HintPath gt       lt  Reference gt   I referred to the numbers in the previous commit and changed only the numbers in project folder  did nothing in android ios folders  Worked for me    Now   lt Reference Include  quot Xamarin iOS quot  gt                                                                lt HintPath gt                         Library Frameworks Xamarin iOS framework Versions 13 20 2 2 lib mono Xamarin iOS Xamarin iOS dll lt  HintPath gt           lt  Reference gt

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If you have built an image with Docker  and you re getting these strange messages      warning MSB3245  Could not resolve this reference  Could not locate   the assembly  Microsoft Extensions Configuration Abstractions   Check   to make sure the assembly exists on disk  If this reference is   required by your code  you may get compilation errors      src Utilities Utilities csproj    Open the affected projectUtilities Utilities csproj   You shall look for your project   You may need to choose Unload Project from the menu first   Right click on the  csproj file  and edit it   Now  delete all the  lt HintPath gt  tags  Save  and try again

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You most likely get this message when the project points to an old location of the assembly where it no longer exists  Since you were able to build it once  the assembly has already been copied into your bin Debug   bin Release folders so your project can still find a copy   If you open the references node of the project in your solution explorer  there should be a yellow icon next to the reference  Remove the reference and add it again from the correct location   If you want to know the location it was referenced from  you d have to open the  csproj file in a text editor and look for the HintPath for that assembly - the IDE for some reason does not show this information

User · Answer

I had the same warning in VS 2017  As it turned out in my case I had added a unit test project and needed to set a dependency for the unit test on the DLL it was testing

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In my case I had the following warnings   Could not resolve this reference  Could not locate the assembly  quot x quot   Check to make sure the assembly exists on disk  If this reference is required by your code  you may get compilation errors    No way to resolve conflict between  quot x  Version 1 0 0 248  Culture neutral  PublicKeyToken null quot  and  quot x quot   Choosing  quot x  Version 1 0 0 248  The path to the dll was correct in my  csproj file but I had it referenced twice and the second reference was with another version  Once I deleted the unnecessary reference  the warning disappeared

User · Answer

Maybe it will help someone  but sometimes Name tag might be missing for a reference and it leads that assembly cannot be found when building with MSBuild  Make sure that Name tag is available for particular reference csproj file  for example        lt ProjectReference Include     MyDependency1 csproj  gt         lt Project gt  9A2D95B3-63B0-4D53-91F1-5EFB99B22FE8  lt  Project gt         lt Name gt MyDependency1 lt  Name gt       lt  ProjectReference gt

[c#] Could not resolve this reference. Could not locate the assembly

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