使用.Net本机构建UWP应用时缺少MissingMetadataException [英] MissingMetadataException when building UWP app with .Net native
问题描述
我有一个使用项目(UWP类库)的UWP应用，该项目本身使用EF7和SQLite.
I have this UWP app that uses a project (UWP class library) which itself uses EF7 and SQLite.
我尝试使用.Net本机工具链在发布模式下构建应用程序，构建成功完成(经过很长一段时间，并且在消耗了尽可能多的内存之后)，但是在退出应用程序后，应用程序崩溃了启动画面.
I tried to build the app in the Release mode using .Net native tool chain, the build completes successfully (after a good long time, and after eating as much memory as it can), but the application crashes just after leaving the splash screen.
在遵循一些建议之后，我尝试使用调试模式运行.Net本机，就像在发布模式下一样完成构建，但是在输出窗口上出现很多错误，并且与该场景相同 UWP-.NET本机工具链编译错误
After following some advice on SO I tried the .Net native with Debug mode, the build finishes just like in the Release mode, but I get many errors on the output window and it is the same scenario as this one UWP - .NET Native tool chain compilation error
我遵循@Matt Whilden的建议，摆脱了这些错误，然后再次尝试.
I followed @Matt Whilden advice, and I got rid of those errors, then tried again.
这次我被这个著名的MissingMetadataException击中了:
This time I got hit by this famous MissingMetadataException :
输出窗口显示以下内容:
The output window shows this :
Exception thrown: 'System.AggregateException' in System.Private.Threading.dll
Exception thrown: 'System.ArgumentException' in System.Linq.Expressions.dll
Exception thrown: 'System.ArgumentException' in System.Linq.Expressions.dll
Exception thrown: 'System.ArgumentException' in System.Linq.Expressions.dll
The thread 0x2a30 has exited with code 0 (0x0).
Exception thrown: 'System.Reflection.MissingMetadataException' in System.Private.Reflection.Core.dll
Additional information: 'Microsoft.Extensions.Caching.Memory.MemoryCacheOptions' is missing
元数据.欲了解更多信息，请访问 http://go.microsoft.com/fwlink/?LinkID=392859
metadata. For more information, please visit http://go.microsoft.com/fwlink/?LinkID=392859
我试图在执行过程中遵循我的代码，但发现这是由我的DbContext第一次调用DbSet表引起的
I tried to follow my code, during execution and I found out that it is caused by the first ever call to a DbSet table from my DbContext
public long GetLastTimeStamp()
{
//-----> Here is the line causing the error
var sortedArticles = DbContext.Articles.OrderByDescending(article => article.ArticlePubDate).ToList();
if (sortedArticles != null && sortedArticles.Count != 0)
{
DateTime epoch = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Local);
TimeSpan elapsedTime = sortedArticles.First().ArticlePubDate - epoch;
return (long)elapsedTime.TotalSeconds;
}
else
{
return 0;
}
}
上面的这个方法在Async方法中被称为，
This method above is called inside an Async method, just to know.
我拼命尝试通过执行以下操作来调用.ToList():
I tried, desperately, to call .ToList() by doing :
var sortedArticles = DbContext.Articles.ToList().OrderByDescending(article => article.ArticlePubDate).ToList();
但仍然会出现相同的错误.
But still get the same error.
这真令人沮丧，我不知道如何解决这个问题，不确定我应该怎样更改Default.rd.xml，任何人都可以帮助我告诉我如何正确实现此构建?
This is really frustrating, I don't know how to solve this problem, not sure what and how I should change the Default.rd.xml, any one can help telling me how to achieve this build correctly ?
推荐答案
请尝试在Default.rd.xml中添加类型"Microsoft.Extensions.Caching.Memory.MemoryCacheOptions"(已存在于您的项目中).
Please try to add type 'Microsoft.Extensions.Caching.Memory.MemoryCacheOptions' in Default.rd.xml (already present in your project).
例如:
<?xml version="1.0" encoding="utf-8"?>
<Directives xmlns="http://schemas.microsoft.com/netfx/2013/01/metadata">
<Application>
<Type Name="Microsoft.Extensions.Caching.Memory.MemoryCacheOptions" Dynamic="Required All" />
</Application>
</Directives>
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