在 MSBuild 中找不到类型或命名空间名称，但在 Visual Studio 中有效

Question

I'm trying to build my multi-project solution from the dotnet CLI, but one project throws error CS0246. I have no problems building it from Visual Studio. The error is encountered on line 1 in the file using the NuGet package that is causing the problem:

using ExcelDataReader;

The error encountered:

error CS0246: The type or namespace name 'ExcelDataReader' could not be found (are you missing a using directive or an assembly reference?)

I run the following commands from cmd:

dotnet restore
dotnet clean
dotnet build

What makes building from Visual Studio different from building from the CLI? What can I do to solve the 'missing' assembly?

Answer 1

I got the same error error CS0246: The type or namespace name 'Polly' could not be found (are you missing a using directive or an assembly reference?) in Jenkin build, because there was version mismatch in project reference and Nuget packages config file.

Project reference .csproj file contains reference of 7. 2.0

<Reference Include="Polly, Version=7.0.0.0, Culture=neutral, PublicKeyToken=c8a3ffc3f8f825cc, processorArchitecture=MSIL">
     <HintPath>..\packages\Polly.7.2.0\lib\net472\Polly.dll</HintPath>
</Reference>

But Neget packages.config file contains 7. 1.0

<package id="Polly" version="7.1.0" targetFramework="net472" />

(May by someone has updated the .csproj file manually)

To resolve this issue:

• Uninstall the library package using Nuget Package Manager.
• Save All.
• Install the library package again using Nuget Package Manager.

Verify the changes to ensure that the reference and config files have the same package reference.