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导出失败的原因是：无法加载一种或多种请求的类型。检索 LoaderExceptions 属性以获取更多信息。

发布于 2024-12-03 14:19:13 字数 138 浏览 0 评论 0原文

每次我将代码发布到另一台服务器时，都会收到以下错误导出失败的原因是：无法加载一种或多种请求的类型。检索 LoaderExceptions 属性以获取更多信息。

这非常令人沮丧，我已经检查并确保包含所有项目参考文件......任何帮助将不胜感激！

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呢古 2024-12-10 14:19:14

我在使用 AutoFac 时遇到了这个问题。基本上我有这行代码，并且得到了与您相同的错误：

return builder.Build();

异常没有告诉您任何信息！因此，您需要按照其说明合并“LoaderExceptions”。我想出了这个效果非常好的方法，并直接指出了缺少的 DLL：

        try
        {
            return builder.Build();
        }
        catch (Exception ex)
        {
            if (ex is ReflectionTypeLoadException)
            {
                var typeLoadException = ex as ReflectionTypeLoadException;
                var loaderExceptions = typeLoadException.LoaderExceptions;
                throw new AggregateException(typeLoadException.Message, loaderExceptions);
            }
            throw;
        }

现在，在异常中我得到了一堆有用的信息，但最重要的是我缺少的 DLL：“(Inner Exception #0) System. IO.FileNotFoundException：无法加载文件或程序集“System.Web.Mvc，Version=3.0.0.0，Culture=neutral，PublicKeyToken=31bf3856ad364e35”或其之一系统找不到指定的文件。
文件名：'System.Web.Mvc, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'"

我发现System.Web.MVC被这个项目引用的一个项目引用了。所以这个项目并不直接需要但它的一个依赖项确实如此。

在您的代码中添加这样的 try/catch ，我想您会省去很多麻烦

。

I had this issue using AutoFac. Basically I had this line of code and was getting the same error as you:

return builder.Build();

The exception tells you nothing as you know! So you need to incorporate the "LoaderExceptions" as it says. I came up with this that works really well and pointed me straight away to the DLL that was missing:

        try
        {
            return builder.Build();
        }
        catch (Exception ex)
        {
            if (ex is ReflectionTypeLoadException)
            {
                var typeLoadException = ex as ReflectionTypeLoadException;
                var loaderExceptions = typeLoadException.LoaderExceptions;
                throw new AggregateException(typeLoadException.Message, loaderExceptions);
            }
            throw;
        }

Now in the exception I get a bunch of useful information but most importantly the DLL I was missing: "(Inner Exception #0) System.IO.FileNotFoundException: Could not load file or assembly 'System.Web.Mvc, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified.
File name: 'System.Web.Mvc, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'"

I found that System.Web.MVC was referenced by a project that this project referenced. So this project did not directly need it but one of it's dependencies did.

Put a try/catch like that around your code and I think you will save yourself a lot of pain.

Cheers.

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一张白纸 2024-12-10 14:19:14

我在 Autofac Build() 周围使用 nootn 的 try catch 代码并收到以下错误，

Could not load file or assembly 'EntityFramework, Version=4.3.1.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)

这是因为我使用的是 MVC4 VS2012 模板，并且默认情况下 EntityFramework 引用默认指向 EF 5 rc。因此，我Uninstall-package EntityFramework，然后Install-package EntityFramework 安装 EF4.3。现在正在工作。谢谢你。

I use the nootn's try catch code around the Autofac Build() and got the following error,

Could not load file or assembly 'EntityFramework, Version=4.3.1.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)

This was because I was using MVC4 VS2012 template and by default the EntityFramework reference was pointing to EF 5 rc by default. So I Uninstall-package EntityFramework and then Install-package EntityFramework which install EF4.3. It's working now. Thank you nootn.

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