Proposal: It is hoped that the ```CastExtensions.As<T>()``` extension method can be consistent with the ```.NET as``` keyword behavior

Summary

It is hoped that the CastExtensions.As<T>() extension method can be consistent with the .NET as keyword behavior

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希望能把 CastExtensions.As<T>() 扩展方法与 .NET as 关键字行为保持一致

Rationale

As shown in the figure, if the as keyword in .NET encounters a type that cannot be converted, it returns null, while the CastExtension.As<T> extension method in WinRT throws an exception. Can the behavior of the as keyword in .NET be consistent in the future? Or provide an extension method similar to TryAs, with a Boolean return value, and return the relevant object through the out parameter?

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如图所示，.NET 的 as 关键字，如果遇到转换不过去的类型，返回 null，而 WinRT 的 CastExtension.As<T> 扩展方法抛出异常，未来能与 .NET as 关键字行为保持一致吗？或者提供一个类似 TryAs 的扩展方法，返回值为布尔值，通过 out 参数返回相关对象？

Important Notes

None

Open Questions

None

Start by locating the CastExtensions.As() extension method and compare its exception behavior with the .NET as keyword described in the issue. Determine whether the desired result is null on an unsuccessful conversion or a TryAs-style Boolean and out-parameter API; the work is done when the chosen behavior is implemented and covered by relevant tests.