通过查询字符串将枚举值传递给 CaliburnMicro 视图模型

发布于 2024-11-05 07:05:45 字数 688 浏览 1 评论 0原文

我是 Caliburn Micro 的新手，正在尝试其 WP7 实现。我想将枚举值从一个虚拟机传递到另一个虚拟机，但我必须遗漏一些明显的东西：我尝试传递其名称及其数值，但目标虚拟机始终获取默认值（对应于 0）。

我的场景更详细：假设我有一个虚拟机，其属性公开了枚举值。假设枚举是 ProductFamily { Hardware, Software }；我有一个按钮，可以打开另一个带有底层虚拟机的屏幕，该屏幕应根据所选系列显示产品列表。因此，VM 在其构造函数中接收的 INavigationService 实例上调用 Navigate，如下所示：（

_navigation.Navigate("MyView.xaml?Family=" + _nFamily, UriKind.RelativeOrAbsolute);

此代码传递名称，但我也尝试使用 (int)_nFamily）。现在，我在目标 VM 中有一个相应的 Family 属性，例如

public ProductFamily Family { get { ... } set { ... } }

，如果我在属性设置器中放置一个断点，我可以看到它被 CM 调用，但接收到的值对应于默认值（0，例如上面示例中的硬件），而我正在等待另一个。我可以确认在构建导航查询字符串时传递了正确的值。那么，目标虚拟机如何获得错误的值呢？

感谢大家

原文

I'm new to Caliburn Micro and I'm experimenting with its WP7 implementation. I'd like to pass the value of an enum from one VM to another but I must be missing something obvious: I tried to pass its name and its numeric value, but the target VM always gets the default value (corresponding to 0).

My scenario in more detail: say I have a VM with a property exposing an enum value. Say the enum is ProductFamily { Hardware, Software }; I have a button which opens another screen with an underlying VM which should show a list of products according to the family chosen. So the VM calls Navigate on the INavigationService instance received in its constructor, like:

_navigation.Navigate("MyView.xaml?Family=" + _nFamily, UriKind.RelativeOrAbsolute);

(this code passes the name, but I tried also with (int)_nFamily). Now, I have a corresponding Family property in the target VM, e.g.

public ProductFamily Family { get { ... } set { ... } }

if I place a breakpoint in the property setter I can see it is called by CM, but the received value corresponds to the default (0, say Hardware in the sample above), while I'm expecting another one. I can confirm the right value is passed when building the query string for navigation. So, how happens that the target VM gets an incorrect value?

Thanks to all

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