如何使用标志枚举时减少ASP.NET MVC视图代码重复 [英] How to reduce code duplication in ASP.NET MVC view when working with Flags enum
问题描述
原谅我的无知。不是做了很多MVC的工作,我敢肯定,必须有一个更好的办法做到这一点,但我似乎无法找到它。我有一个标志枚举是这样的:
Forgive my ignorance. Not done a lot of MVC work, and I'm sure there must be a better way to do this but I can't seem to find it. I have a Flags enum like this:
[Flags]
public enum Services
{
Foo = 1,
Bar = 2,
Meh = 4
}
和具有这种类型的值在我的模型一个SelectedServices属性。在视图中,我为每个可能的服务的复选框。我已经实现了绑定逻辑,像这样:
And a SelectedServices property on my Model which has a value of this type. In the View, I have a checkbox for each possible service. I have implemented the binding logic like so:
<div><label><input type="checkbox" name="services" value="@((int)Services.Foo)"
@if(Model.SelectedServices.HasFlag(Services.Foo))
{
<text>checked</text>
}
/>Foo</label></div>
<div><label><input type="checkbox" name="services" value="@((int)Services.Bar)"
@if(Model.SelectedServices.HasFlag(Services.Bar))
{
<text>checked</text>
}
/>Bar</label></div>
等。它的工作原理,但确实是可怕的混乱。
And so on. Which works, but is really horribly messy.
有一定,肯定有更好的方式来封装 - 但我不知道相关的概念是MVC
There must, surely be a better way to encapsulate this - but I have no idea what the relevant concept is in MVC?
推荐答案
创建剃刀帮手:
@helper DisplayFlagHelper(Services flag)
{
<div><label><input type="checkbox" name="services" value="@((int)flag)"
if(Model.SelectedServices.HasFlag(flag))
{
<text>checked</text>
}
/>@flag</label></div>
}
@DisplayFlagHelper(Services.Foo)
@DisplayFlagHelper(Services.Foo)
或共享视图
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