便携式类库档案失踪78属性相关的方法/属性 [英] Portable Class Library Profile 78 missing attribute related methods/properties

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问题描述

在我的PCL核心项目(WP8,Android版,iOS版,Xamarin,MvvmCross)我使用自定义属性。该Type.GetCustomAttributes()扩展方法可以让我检查一下所使用的属性。



使用PCL Profile104这个效果很好。但是,因为我想用异步/的await,我需要使用PCL Profile78(和.NET 4.5)



问题:看来GetCustomAttributes()和Attributes属性不在Profile78可用。为什么?



请注意:
我通过创建一个配置文件PCL 104类库和包装的GetCustomAttributes(),然后从引用这个库寻找到解决办法我PCL Profile78库。但是似乎extensionmethods不支持...



示例代码:

 公共Pcl78Class()
{
型T = this.GetType();
VAR属性= t.Attributes;
VAR customAttributes = t.GetCustomAttributes(真);

//另一个奇怪的事情:为什么VS CodeCompletion告诉我它知道CustomAttributeExtensions类和方法?
//System.Reflection.CustomAttributeExtensions.GetCustomAttributes(t);
}




解决方案

问题:似乎GetCustomAttributes()和Attributes属性都无法在Profile78。为什么?




Profile78包括Windows应用商店8 支持(如我的博客上指出),和的 Windows应用商店拥有更高效的执行<$ C $的C>键入基于反射。从本质上讲,你只需要调用 Type.GetTypeInfo 获得所属类别,并从那里应该是相当简单的。


In my PCL core project (WP8, Android, iOS, Xamarin, MvvmCross) I use custom attributes. The Type.GetCustomAttributes() extension method lets me examine the attributes used.

Using PCL Profile104 this works well. But because I want to use async/await, I'll need to use PCL Profile78 (and .NET 4.5)

Problem: Seems the GetCustomAttributes() and the Attributes property are not available in Profile78. Why??

Note: I am looking into the workaround by creating a PCL Profile 104 class library and wrapping the GetCustomAttributes() and then referencing this library from my PCL Profile78 library. However it seems extensionmethods are not supported...

Example Code:

public Pcl78Class()
{
    Type t = this.GetType();
    var attributes = t.Attributes;
    var customAttributes = t.GetCustomAttributes(true);

    // another weird thing: Why is VS CodeCompletion telling me it knows CustomAttributeExtensions class and methods?
    //System.Reflection.CustomAttributeExtensions.GetCustomAttributes(t);
}

解决方案

Problem: Seems the GetCustomAttributes() and the Attributes property are not available in Profile78. Why??

Profile78 includes support for Windows Store 8 (as noted on my blog), and Windows Store has a more efficient implementation of Type-based reflection. Essentially, you just have to call Type.GetTypeInfo to get a TypeInfo, and from there it should be pretty straightforward.

这篇关于便携式类库档案失踪78属性相关的方法/属性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IT屋!

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