MVC 4剃刀数据注释只读 [英] MVC 4 razor Data Annotations ReadOnly

问题描述

只读属性似乎并没有在MVC 4.编辑（假）的属性不工作，我希望它的方式。

有没有类似的东西的作品？

如果没有，那么我怎样才能使自己的只读属性，将工作是这样的：

 公共类AMODEL
{
   [只读（真）]或只是[只读]
   字符串aProperty {搞定;组;}
}
 

这样我就可以把这个：

  @ Html.TextBoxFor（X =＆GT; x.aProperty）
 

代替本（其中不工作）：

  @ Html.TextBoxFor（X =＆GT; x.aProperty，新{@只读=只读}）
 

或此（它的工作，但没有提交值）：

  @ Html.TextBoxFor（X =＆GT; x.aProperty，新{禁用=禁用}）
 

<一个href=\"http://view.jquerymobile.com/1.3.2/dist/demos/widgets/forms/form-disabled.html\">http://view.jquerymobile.com/1.3.2/dist/demos/widgets/forms/form-disabled.html

这样的可能？
<一href=\"http://stackoverflow.com/a/11702643/1339704\">http://stackoverflow.com/a/11702643/1339704

请注意：

    公共字符串PropX {搞定;组; }
    公共字符串PropY {搞定;组; }
}

我已经验证了这工作与后续的剃刀code：

  @ Html.MyTextBoxFor（M = GT; m.PropX）
@ Html.MyTextBoxFor（M = GT; m.PropY）
 

这使得为：

 ＆LT;输入ID =PropXNAME =PropX只读=只读类型=文本VALUE =Propx/＆GT;
＆LT;输入ID =PropYNAME =PropY类型=文本VALUE =PropY/＆GT;
 

如果您需要禁用而不是只读您可以轻松地更改相应的帮手。

The ReadOnly attribute does not seem to be in MVC 4. The Editable(false) attribute does not work the way I would want it to.

Is there something similar that works?

If not then how can I make my own ReadOnly attribute that would work like this:

public class aModel
{
   [ReadOnly(true)] or just [ReadOnly]
   string aProperty {get; set;}
}

so I can put this:

@Html.TextBoxFor(x=> x.aProperty)

instead of this ( which does work ):

@Html.TextBoxFor(x=> x.aProperty , new { @readonly="readonly"})

or this ( which does work but values are not submitted ):

@Html.TextBoxFor(x=> x.aProperty , new { disabled="disabled"})

http://view.jquerymobile.com/1.3.2/dist/demos/widgets/forms/form-disabled.html

something like this maybe? http://stackoverflow.com/a/11702643/1339704

Note:

[Editable(false)] did not work

解决方案

You can create a custom helper like this that will check the property for the presence of a ReadOnly attribute:

public static MvcHtmlString MyTextBoxFor<TModel, TValue>(
    this HtmlHelper<TModel> helper, Expression<Func<TModel, TValue>> expression)
{
    var metaData = ModelMetadata.FromLambdaExpression(expression, helper.ViewData);
    // in .NET 4.5 you can use the new GetCustomAttribute<T>() method to check
    // for a single instance of the attribute, so this could be slightly
    // simplified to:
    // var attr = metaData.ContainerType.GetProperty(metaData.PropertyName)
    //                    .GetCustomAttribute<ReadOnly>();
    // if (attr != null)
    bool isReadOnly = metaData.ContainerType.GetProperty(metaData.PropertyName)
                              .GetCustomAttributes(typeof(ReadOnly), false)
                              .Any();

    if (isReadOnly)
        return helper.TextBoxFor(expression, new { @readonly = "readonly" });
    else
        return helper.TextBoxFor(expression);
}

The attribute is simply:

public class ReadOnly : Attribute
{

}

For an example model:

public class TestModel
{
    [ReadOnly]
    public string PropX { get; set; }
    public string PropY { get; set; }
}

I have verified this works with the follow razor code:

@Html.MyTextBoxFor(m => m.PropX)
@Html.MyTextBoxFor(m => m.PropY)

Which renders as:

<input id="PropX" name="PropX" readonly="readonly" type="text" value="Propx" />
<input id="PropY" name="PropY" type="text" value="PropY" />

If you need disabled instead of readonly you can easily change the helper accordingly.

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