TransformXml task fails via msbuild on linux using mono

Question

After following the steps in this answer, when attempting to build a project through mono (Using msbuild), I get the following error:

(AfterCompile target) -> project.csproj(469,5): error MSB4062: The "TransformXml" task could not be loaded from the assembly /usr/lib/mono/xbuild/Microsoft/VisualStudio/v15.0/Web/Microsoft.Web.Publishing.Tasks.dll. Confirm that the declaration is correct, that the assembly and all its dependencies are available, and that the task contains a public class that implements Microsoft.Build.Framework.ITask.

It appears as if Microsoft.Web.Publishing.Tasks.dll is unavailable.

Blue · Accepted Answer · 2017-10-11 13:30:36Z

15

On linux via mono, this file doesn't exist. To solve this issue, follow these steps:

Install the nuget package MSBuild.Microsoft.VisualStudio.Web.targets
Right click your project, and click "Unload Project"
Right click your (now unloaded) project, and click "Edit MyProjectName.csproj"
Replace this line:

<UsingTask TaskName="TransformXml" AssemblyFile="$(MSBuildExtensionsPath)\Microsoft\VisualStudio\v$(VisualStudioVersion)\Web\Microsoft.Web.Publishing.Tasks.dll" />

With your updated nuget Microsoft.Web.Publishing.Tasks.dll location (Update version name in MSBuild.Microsoft.VisualStudio.Web.targets.14.0.0.3 as necessary):

<UsingTask TaskName="TransformXml" AssemblyFile="..\packages\MSBuild.Microsoft.VisualStudio.Web.targets.14.0.0.3\tools\VSToolsPath\Web\Microsoft.Web.Publishing.Tasks.dll" />

Reload your project, and voila, working build on linux!

edited Oct 11, 2017 at 13:30

answered Jul 14, 2017 at 8:10

Blue

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3 Comments

Thomas Bindzus Over a year ago

This solution was my rescue more than 3 years later, thank you so much!

user3336882 Over a year ago

I had to add <UsingTask TaskName="TransformXml" AssemblyFile="..\packages\MSBuild.Microsoft.VisualStudio.Web.targets.14.0.0.3\tools\VSToolsPath\Web\Microsoft.Web.Publishing.Tasks.dll" /> to .csproj as it was not present yet.

Ben Over a year ago

This worked for me on OSX except that I had to drop the initial ..\ from the AssemblyFile property, so

<UsingTask TaskName="TransformXml" AssemblyFile="packages\MSBuild.Microsoft.VisualStudio.Web.targets.14.0.0.3\tools\VSToolsPath\Web\Microsoft.Web.Publishing.Tasks.dll" />

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