Winrt和PhotoEditor示例中的收藏范围 [英] Scope of Collections in Winrt And PhotoEditor example

问题描述

1. Winrt :: Windows :: Foundation :: Collection仅具有没有具体集合类型的接口。

1. Winrt::Windows::Foundation::Collection only has interfaces no concrete collection type.

I已经被告知要使用Platorm :: Collections，但是不确定如何从Winrt :: Windows :: ?????中获得该信息。我以为它只适用于C ++ / Cx

I have been told to use Platorm::Collections, but not sure how you get to that from Winrt::Windows::?????. I thought its only for C++/Cx

3。我在PhotoEditor示例中复制并使用了Observable_Vector，但构建错误，说我在vector中的类型未实现GetTrustLevel（）。

3.I have copied and used the Observable_Vector in PhotoEditor sample but am getting error on build saying my type in vector does not implement GetTrustLevel().

1. 如果我不能使用Platform :: Collections在WInrt中，这意味着当前只有一个示例如何在Winrt（PhotoEditor）中使用集合，这也意味着Winrt中的onyl具体集合是phtotEditor中的Observable_Vector。

需要帮助来阐明c ++-Winrt中的收集范围。
还有关于使用PhotoEditor中相同的Observable_vector时为什么获得信任级别错误的任何帮助。

Need help to clarify the scope of collection in c++-Winrt. And also any help as to why am Getting Trust level error when using same Observable_vector from PhotoEditor.

谢谢

推荐答案

通常，您不必实现自己的集合。 C ++ / WinRT提供了一组帮助器函数，用于创建各种常见的通用集合类型。例如：

In general, you should not have to implement your own collections. C++/WinRT provides a set of helper functions for creating a variety of common generic collection types. For example:

using namespace winrt;
using namespace Windows::Foundation::Collections;

int main()
{
    IVector<int> a = single_threaded_vector<int>({ 1,2,3 });
    IObservableMap<hstring, int> b = single_threaded_observable_map<hstring, int>();
}

还支持创建自定义集合。我在这里描述了其中一些选项：

There is also support for creating custom collections. I described some of those options here:

https://kennykerr.ca/2018/05/12/cppwinrt-creating-collections-simply-ficiently/

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