我刚刚帮助一个团队成员通过重命名回购文件夹重新克隆回购解决了这个问题。这只是一个开发人员的问题，因为团队中的其他人都能够在构建master时不碰到这个错误，所以我们知道这个问题不是源代码的问题。

我们确实尝试删除bin和obj文件夹，并执行git clean -xfd，但这些都没有解决这个问题。在这种情况下，用一个干净的回购副本重新开始是有效的。

我在msdn上找到了这个答案，这解释了将文件标记为内容，然后复制到输出= If更新。请看下面的文章:

https://social.msdn.microsoft.com/Forums/en-US/8671bdff-9b16-4b49-ba9e-227cc4df31b2/compile-error-cs0579-duplicate-assemblyversion-attribute?forum=vsgatk

GH

我也有同样的错误，它在程序集版本和程序集文件版本下划线，所以阅读Luqi答案，我只是把它们作为注释添加了进去，错误就解决了

// AssemblyVersion is the CLR version. Change this only when making breaking    changes
//[assembly: AssemblyVersion("3.1.*")]
// AssemblyFileVersion should ideally be changed with each build, and should help identify the origin of a build
//[assembly: AssemblyFileVersion("3.1.0.0")]

编辑AssemblyInfo.cs和#if !NETCOREAPP3_0…# endif

using System.Reflection;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
// General Information about an assembly is controlled through the following
// set of attributes. Change these attribute values to modify the information
// associated with an assembly.

#if !NETCOREAPP3_0  

[assembly: AssemblyTitle(".Net Core Testing")]
[assembly: AssemblyDescription(".Net Core")]
[assembly: AssemblyConfiguration("")]
[assembly: AssemblyCompany("")]
[assembly: AssemblyProduct(".Net Core")]
[assembly: AssemblyCopyright("Copyright ©")]
[assembly: AssemblyTrademark("")]
[assembly: AssemblyCulture("")]

// Setting ComVisible to false makes the types in this assembly not visible
// to COM components.  If you need to access a type in this assembly from
// COM, set the ComVisible attribute to true on that type.
[assembly: ComVisible(false)]

// The following GUID is for the ID of the typelib if this project is exposed to COM
[assembly: Guid("000b119c-2445-4977-8604-d7a736003d34")]

// Version information for an assembly consists of the following four values:
//
//      Major Version
//      Minor Version
//      Build Number
//      Revision
//
// You can specify all the values or you can default the Build and Revision Numbers
// by using the '*' as shown below:
// [assembly: AssemblyVersion("1.0.*")]
[assembly: AssemblyVersion("1.0.0.0")]
[assembly: AssemblyFileVersion("1.0.0.0")]

#endif

对我来说，AssembyInfo.cs和SolutionInfo.cs有不同的值。所以也检查一下这些文件。我只是把其中一个版本删除了。

我最近遇到了这种情况，没有对源代码进行任何更改，但在尝试了一些新的项目参考之后。我进入了这样一种状态，即使在恢复了分支中的所有更改之后，这个错误仍然出现。

清理树枝解决了我的问题:

Git clean -xfd