问题
The pasted below error only occurs when the solution has more than one project that references the EntityFramework. When run the "Enable-Migrations" or "Add-Migration", I received the following error:
New-Object : The value supplied is not valid, or the property is read-only. Change the value, and then try again. At D:\Projetos\Monitoramento\packages\EntityFramework.6.1.3\tools\EntityFramework.psm1:757 char:13 + $info = New-Object System.AppDomainSetup -Property @{ + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + CategoryInfo : InvalidData: (:) [New-Object], Exception + FullyQualifiedErrorId : SetValueException,Microsoft.PowerShell.Commands.NewObjectCommand The property 'PrivateBinPath' cannot be found on this object. Verify that the property exists and can be set. At D:\Projetos\Monitoramento\packages\EntityFramework.6.1.3\tools\EntityFramework.psm1:772 char:9 + $info.PrivateBinPath += ';lib\net45' + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + CategoryInfo : InvalidOperation: (:) [], RuntimeException + FullyQualifiedErrorId : PropertyNotFound Exception calling "LoadFrom" with "1" argument(s): "The specified path, file name, or both are too long. The fully qualified file name must be less than 260 characters, and the directory name must be less than 248 characters." At D:\Projetos\Monitoramento\packages\EntityFramework.6.1.3\tools\EntityFramework.psm1:780 char:5 + $utilityAssembly = [System.Reflection.Assembly]::LoadFrom((Join-Path $ToolsP ... + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + CategoryInfo : NotSpecified: (:) [], MethodInvocationException + FullyQualifiedErrorId : PathTooLongException You cannot call a method on a null-valued expression. At D:\Projetos\Monitoramento\packages\EntityFramework.6.1.3\tools\EntityFramework.psm1:781 char:5 + $dispatcher = $utilityAssembly.CreateInstance( + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + CategoryInfo : InvalidOperation: (:) [], RuntimeException + FullyQualifiedErrorId : InvokeMethodOnNull Exception calling "CreateInstanceFrom" with "8" argument(s): "The specified path, file name, or both are too long. The fully qualified file name must be less than 260 characters, and the directory name must be less than 248 characters." At D:\Projetos\Monitoramento\packages\EntityFramework.6.1.3\tools\EntityFramework.psm1:809 char:5 + $domain.CreateInstanceFrom( + ~~~~~~~~~~~~~~~~~~~~~~~~~~~ + CategoryInfo : NotSpecified: (:) [], MethodInvocationException + FullyQualifiedErrorId : PathTooLongException
Output with EntityFramework 6.1.1:
Exception calling "LoadFrom" with "1" argument(s): "The specified path, file name, or both are too long. The fully qualified file name must be less than 260 characters, and the directory name must be less than 248 characters." At C:\Users\Hudson\Documents\Visual Studio 2015\Projects\WpfApplication4\packages\EntityFramework.6.1.1\tools\EntityFramework.psm1:780 char:5 + $utilityAssembly = [System.Reflection.Assembly]::LoadFrom((Join-Path $ToolsP ... + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + CategoryInfo : NotSpecified: (:) [], MethodInvocationException + FullyQualifiedErrorId : PathTooLongException You cannot call a method on a null-valued expression. At C:\Users\Hudson\Documents\Visual Studio 2015\Projects\WpfApplication4\packages\EntityFramework.6.1.1\tools\EntityFramework.psm1:781 char:5 + $dispatcher = $utilityAssembly.CreateInstance( + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + CategoryInfo : InvalidOperation: (:) [], RuntimeException + FullyQualifiedErrorId : InvokeMethodOnNull Exception calling "CreateInstanceFrom" with "8" argument(s): "The specified path, file name, or both are too long. The fully qualified file name must be less than 260 characters, and the directory name must be less than 248 characters." At C:\Users\Hudson\Documents\Visual Studio 2015\Projects\WpfApplication4\packages\EntityFramework.6.1.1\tools\EntityFramework.psm1:809 char:5 + $domain.CreateInstanceFrom( + ~~~~~~~~~~~~~~~~~~~~~~~~~~~ + CategoryInfo : NotSpecified: (:) [], MethodInvocationException + FullyQualifiedErrorId : PathTooLongException
回答1:
Other solution: https://github.com/aspnet/EntityFramework/issues/1950#issuecomment-99164398
Copy this patched version of EntityFramework.psm1.
回答2:
I have the same problem :(
My workaround is:
- Downgrade Entity Framework to v6.1.1 (at least the new NuGet GUI makes this very easy)
- Run the command (for example
Add-Migration ...) on the package manager console. It seems to work in this version - Upgrade back to Entity Framework v6.1.3
回答3:
Seems to be a common issue, but apparently difficult to repo?
Enable-migrations error #1950
Suggest you add your issue details to the above in the hopes that it can be resolved quickly.
回答4:
As per comment by yishaigalatzer on EF bug #1950, NuGet 3.0 RC2 has now been released, which should fix this problem. Simply download the VSIX from codeplex and install it.
This solved the problem for me.
回答5:
In my case I just:
1. Closed VS.
2. Removed Entity Framework package in packages folder manually.
3. Opened project and restored packages.
That worked for me.
回答6:
I found a temporary solution:
Comment <package id="EntityFramework" version="6.1.3" targetFramework="net46" userInstalled="true" /> of all its "packages.config" leaving uncommented only the project you want to work with Migrations.
The Team EntityFramework (https://github.com/aspnet/EntityFramework/issues/1950) and NuGet (https://github.com/NuGet/Home/issues/528) are aware of the problem and we will soon have a solution final.
来源：https://stackoverflow.com/questions/30030521/visual-studio-2015-rc-entity-framework-6-1-3-migrations-error