Azure Function，EF Core，无法加载ComponentModel.Annotations 4.2.0.0 [英] Azure Function, EF Core, Can't load ComponentModel.Annotations 4.2.0.0

问题描述

我创建了几个.Net Standard 2.0库，通过控制台应用程序测试了执行情况，还进行了多个测试-一切都很好.

I have created several .Net Standard 2.0 libraries, tested the execution via a console application, as well as several tests - all is good.

移至azure函数，并得到以下运行时错误:

Move over to azure function, and get the following run-time error:

然后我尝试将该特定版本下载到API Function项目中:

I then try to download that specific version into the API Function project:

我正在使用Visual Studio版本15.7.0预览版5.0.我已将Azure Function更新到4.7 ...，因为控制台和测试项目是-并且可以正常工作.

I'm using Visual Studio Version 15.7.0 Preview 5.0. I have updated the Azure Function to 4.7... as the console and test projects are - and those work.

因为这个时间太多了，所以我希望解决方案不会太疯狂. Ef Core 2.1.0-rc1-final也参与其中.对Required，MaxLength，NotMapped使用数据注释.

Been at this a far too many hours.. so I'm hoping the resolution isn't something crazy. Ef Core 2.1.0-rc1-final is also in the mix. Using data annotations for Required, MaxLength, NotMapped.

图形错误表示: Microsoft.EntityFrameworkCore:无法加载文件或程序集'System.ComponentModel.Annotations，版本= 4.2.0.0

Error in graphic says: Microsoft.EntityFrameworkCore: Could not load file or assembly 'System.ComponentModel.Annotations, Version=4.2.0.0

推荐答案

我建议一旦启动Azure函数，就在下面运行此函数.它将所有程序集重定向到现有版本.

I would suggest running this function below once you start your Azure Function. It will redirect any assembly to an existing version.

public class FunctionsAssemblyResolver
{
    public static void RedirectAssembly()
    {
        var list = AppDomain.CurrentDomain.GetAssemblies().OrderByDescending(a => a.FullName).Select(a => a.FullName).ToList();
        AppDomain.CurrentDomain.AssemblyResolve += CurrentDomain_AssemblyResolve;
    }

    private static Assembly CurrentDomain_AssemblyResolve(object sender, ResolveEventArgs args)
    {
        var requestedAssembly = new AssemblyName(args.Name);
        Assembly assembly = null;
        AppDomain.CurrentDomain.AssemblyResolve -= CurrentDomain_AssemblyResolve;
        try
        {
            assembly = Assembly.Load(requestedAssembly.Name);
        }
        catch (Exception ex)
        {
        }
        AppDomain.CurrentDomain.AssemblyResolve += CurrentDomain_AssemblyResolve;
        return assembly;
    }

}

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