本文介绍了启用迁移错误的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我是新的EF，当我尝试在PMC控制台中运行启用迁移时，我有一个错误：异常调用LoadFrom与1参数：
无法加载文件或程序集file：///...\pa
ckages\EntityFramework.6.0.1\\ \\tools\EntityFramework.PowerShell.Utility.dll'或其一个依赖关系不支持操作（来自HRESULT的异常：0x80131515）
在... \packages\EntityFramework.6.1.1\\ \\tools\EntityFramework.psm1：780 char：62
+ $ utilityAssembly = [System.Reflection.Assembly] :: LoadFrom<<<< （（Join-Path $ ToolsPath EntityFramework.PowerShell.Utility.dll））
+ CategoryInfo：NotSpecified：（:) []，MethodInvocationException
+ FullyQualifiedErrorId：DotNetMethodException
您无法调用空值表达式的方法。
在... \packages\EntityFramework.6.1.1\tools\EntityFramework.psm1：781 char：50
+ $ dispatcher = $ utilityAssembly.CreateInstance<<<<< ; （
+ CategoryInfo：InvalidOperation：（CreateInstance：String）[]，RuntimeException
+ FullyQualifiedErrorId：InvokeMethodOnNull
使用8参数调用CreateInstanceFrom异常：无法加载文件或程序集file：///...\packages\EntityFramework.6.0.1\tools\EntityFramework.PowerShell.dll或其依赖项之一，不支持操作（异常来自HRESULT：0x80131515）
At ... \packages\EntityFramework.6.1.1\tools\EntityFramework.psm1：809 char：31
+ $ domain.CreateInstanceFrom<< <（
+ CategoryInfo：NotSpecified：（:) []，MethodInvocationException
+ FullyQualifiedErrorId：DotNetMethodException
解决方案
我刚刚在同事的一台机器上碰到这个问题，解决方法是：
- 卸载EF NuGet软件包
- 手动删除实体框Web.Config / App.Config文件中的ework部分
- 关闭Visual Studio
- 在Visual Studio中重新打开解决方案
- 重新安装EF NuGet软件包
I'm new with EF and I have an error when I try to run Enable-Migrations in PMC console :Exception calling "LoadFrom" with "1" argument(s):
"Could not load file or assembly 'file:///...\pa
ckages\EntityFramework.6.0.1\tools\EntityFramework.PowerShell.Utility.dll' or one of its dependencies. Operation is not supported. (Exception from HRESULT: 0x80131515)"
At ...\packages\EntityFramework.6.1.1\tools\EntityFramework.psm1:780 char:62
+ $utilityAssembly = [System.Reflection.Assembly]::LoadFrom <<<< ((Join-Path $ToolsPath EntityFramework.PowerShell.Utility.dll))
+ CategoryInfo : NotSpecified: (:) [], MethodInvocationException
+ FullyQualifiedErrorId : DotNetMethodException
You cannot call a method on a null-valued expression.
At ...\packages\EntityFramework.6.1.1\tools\EntityFramework.psm1:781 char:50
+ $dispatcher = $utilityAssembly.CreateInstance <<<< (
+ CategoryInfo : InvalidOperation: (CreateInstance:String) [], RuntimeException
+ FullyQualifiedErrorId : InvokeMethodOnNull
Exception calling "CreateInstanceFrom" with "8" argument(s): "Could not load file or assembly 'file:///...\packages\EntityFramework.6.0.1\tools\EntityFramework.PowerShell.dll' or one of its dependencies. Operation is no t supported. (Exception from HRESULT: 0x80131515)"
At ...\packages\EntityFramework.6.1.1\tools\EntityFramework.psm1:809 char:31
+ $domain.CreateInstanceFrom <<<< (
+ CategoryInfo : NotSpecified: (:) [], MethodInvocationException
+ FullyQualifiedErrorId : DotNetMethodException
解决方案
I just ran into this on one of my co-worker's machine. The solution was:
- Uninstall EF NuGet package
- Manually remove Entity Framework sections from the Web.Config/App.Config files
- Close Visual Studio
- Re-open the solution in Visual Studio
- Reinstall the EF NuGet Package
这篇关于启用迁移错误的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！