在使用默认值的模型的属性注解 [英] Annotating properties on a model with default values

问题描述

我创建了一个EF4.1 code-第一种模式（可能并不重要），而我试图让默认值我创建脚手架模板。我的模型是这样的：

I created an EF4.1 code-first model (may or may not be important), and I'm trying to get default values for my Create scaffold template. My model looks like:

class Person {
    [DefaultValue (18)]
    public int Age { get; set; }
}

然后我创建视图的样子：

And then my Create view looks like:

<div class="editor-label">
    @Html.LabelFor(model => model.Age)
</div>
<div class="editor-field">
    @Html.EditorFor(model => model.Age)
    @Html.ValidationMessageFor(model => model.Age)
</div>

我希望在运行时，该EditorFor将美元，18P $ P-填充文本框，但它确实没有这样的事。我误解了默认值属性是什么，或者有什么别的我应该做的事？

I would expect at runtime, that the EditorFor would pre-populate the textbox with "18", but it does no such thing. Am I misunderstanding what the DefaultValue attribute is for, or is there something else I should be doing?

请注意：我不想使用新{值=18} 覆盖上EditorFor方法，它似乎打破DRY

Note: I don't want to use the new { Value = "18" } override on the EditorFor method, it seems to break DRY.

推荐答案

我不知道这是否会满足您的需要干的，但它是一个开始，我认为。

I don't know if this will satisfy your DRY needs, but it's a start I think.

我要返工的模式有点像这样：

I would rework the model a bit like this:

public class Person {
    private const int DEFAULT_AGE = 18;
    private int _age = DEFAULT_AGE;
    [DefaultValue(DEFAULT_AGE)]
    public int Age {
        get { return _age; }
        set { _age = value; }
    }
}

请查看方式为，但在创建操作做到这一点：

Keep the view as is, but in the create action do this:

public ActionResult Create() {
    return View(new Person());
}

这样，输入文本框将使用默认值时代创建的，只会有一个地方，将指定的默认​​值。

That way, the input textbox will be created with the default Age value, and there will be only one place where that default will be specified.

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