c# – 启用 – 迁移时出错

发布时间：2020-12-15 04:05:56 所属栏目：百科来源：网络整理

导读：我是EF的新手,当我尝试在PMC控制台中运行Enable-Migrations时出错：使用“1”参数调用“LoadFrom”的异常： "Could not load file or assembly 'file:///...packagesEntityFramework.6.0.1toolsEntityFramework.PowerShell.Utility.dll' or one of its

我是EF的新手,当我尝试在PMC控制台中运行Enable-Migrations时出错：
使用“1”参数调用“LoadFrom”的异常：

"Could not load file or assembly 'file:///...pa
ckagesEntityFramework.6.0.1toolsEntityFramework.PowerShell.Utility.dll' or one of its dependencies. Operation is not supported. (Exception from HRESULT: 0x80131515)"
At ...packagesEntityFramework.6.1.1toolsEntityFramework.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 ...packagesEntityFramework.6.1.1toolsEntityFramework.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:///...packagesEntityFramework.6.0.1toolsEntityFramework.PowerShell.dll' or one of its dependencies. Operation is no t supported. (Exception from HRESULT: 0x80131515)"
At ...packagesEntityFramework.6.1.1toolsEntityFramework.psm1:809 char:31
+     $domain.CreateInstanceFrom <<<< (
    + CategoryInfo          : NotSpecified: (:) [],MethodInvocationException
    + FullyQualifiedErrorId : DotNetMethodException

解决方法

我刚刚在同事的机器上碰到了这个.解决方案是：

>卸载EF NuGet包>从Web.Config / App.Config文件中手动删除实体框架部分>关闭Visual Studio>在Visual Studio中重新打开解决方案>重新安装EF NuGet包

（编辑：李大同）

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