Including symbols in a single file bundle is not supported when publishing for .NET5 or higher

Question

I try to publish a .net Core (WinForms) project, which I upgraded from core3.0 to net5.0, as Single Exe.

I get the following error:

NETSDK1142: Including symbols in a single file bundle is not supported when publishing for .NET5 or higher.

researching NETSDK1142 I do not get any results in google regarding a fix.

With Core3.0 the following command worked:

dotnet publish nameofproject.csproj \
   -o bin/Release/core \
   -c Release \
   -p:Platform=x64 \
   -r win-x64 \
   --self-contained true

I also tried the following flags for net5.0. Still getting the same error even with DebugSymbols=false

dotnet publish nameofproject.csproj \
    -o bin/Release/core \
    -c Release \
    -p:Platform=x64 \
    -p:NoWarn=CS0618 \
    -p:NoWarn=NU1605 \
    --self-contained true \
    -p:PublishSingleFile=true \
    -p:IncludeAllContentForSelfExtract=true \
    -p:PublishReadyToRun=true \
    -p:PublishTrimmed=false \
    -p:IncludeNativeLibrariesForSelfExtract=true \
    /p:DebugType=None /p:DebugSymbols=false

Answer 1

Solution

just add -p:IncludeSymbolsInSingleFile=false or /p:IncludeSymbolsInSingleFile=false to the publish command

How I found it

After trying to fix the issue since 2 days the solution was found in the dotnet/sdk Source Code.

in sdk/src/Tasks/Common/Resources/Strings.resx I found the error string

  <data name="CannotIncludeSymbolsInSingleFile" xml:space="preserve">
    <value>NETSDK1142: Including symbols in a single file bundle is not supported when publishing for .NET5 or higher.</value>
    <comment>{StrBegin="NETSDK1142: "}</comment>
  </data>

then I tracked down the CannotIncludeSymbolsInSingleFile string resource in the sourcecode and found the following result in sdk/src/Tasks/Microsoft.NET.Build.Tasks/targets/Microsoft.NET.Publish.targets

<NETSdkError Condition="'$(PublishSingleFile)' == 'true' And
                            '$(IncludeSymbolsInSingleFile)' == 'true' And
                            '$(_TargetFrameworkVersionWithoutV)' >= '5.0' And '$(TargetFrameworkIdentifier)' == '.NETCoreApp'"
                 ResourceName="CannotIncludeSymbolsInSingleFile" />

There I found the Flag I had to set on build IncludeSymbolsInSingleFile