ASP.NET MVC - 扩展TextBoxFor无需重新编写方法 [英] ASP.NET MVC - Extending TextBoxFor without re-writing the method

问题描述

是否有任何可能的方式来扩展基本的HTML佣工（ TextBoxFor ， TextAreaFor 等）使用扩展方法他们的产出，而不是仅仅重写整个方法完全？例如，添加在...

Is there any possible way to extend the basic html helpers (TextBoxFor, TextAreaFor, etc) using extension methods on their output, instead of just re-writing the entire methods completely? For instance, adding in ...

@ Html.TextBoxFor（型号=＆GT; model.Name）.Identity（idName）

我知道我可以用这个实现以下，已经..

I know I can achieve this using the following, already..

@ Html.TextBoxFor（型号=＆GT; model.Name，新{@id =idName}）

不过，获取笨重和令人沮丧的管理时，你必须开始添加很多的属性。有什么办法来添加扩展到这些固有的不只是 htmlAttributes 通过为每个小细节？

But that gets clunky and frustrating to manage when you have to start adding a lot of properties. Is there any way to add extensions to these inherently without just passing in htmlAttributes for every little detail?

推荐答案

由于@AaronShockley说，因为 TextBoxFor（）返回 MvcHtmlString ，你开发修改输出的流体API式唯一的选择将是通​​过辅助方法 MvcHtmlString 返回s运行。这样做，我认为一个稍微不同的方式接近你以后会使用属性生成器的对象，像这样的：

As @AaronShockley says, because TextBoxFor() returns an MvcHtmlString, your only option for developing a 'fluid API' style of amending the output would be to operate on the MvcHtmlStrings returned by the helper methods. A slightly different way of doing this which I think approaches what you're after would be to use a 'property builder' object, like this:

public class MvcInputBuilder
{
    public int Id { get; set; }

    public string Class { get; set; }
}

...并设置扩展方法是这样的：

...and to set up extension methods like this:

public static MvcHtmlString TextBoxFor<TModel, TProp>(
    this HtmlHelper<TModel> htmlHelper,
    Expression<Func<TModel, TProp>> expression,
    params Action<MvcInputBuilder>[] propertySetters)
{
    MvcInputBuilder builder = new MvcInputBuilder();

    foreach (var propertySetter in propertySetters)
    {
        propertySetter.Invoke(builder);
    }

    var properties = new RouteValueDictionary(builder)
        .Select(kvp => kvp)
        .Where(kvp => kvp.Value != null)
        .ToDictionary(kvp => kvp.Key, kvp => kvp.Value);

    return htmlHelper.TextBoxFor(expression, properties);
}

然后，您可以做这样的东西在你查看：

You can then do stuff like this in your View:

@this.Html.TextBoxFor(
    model => model.Name,
    p => p.Id = 7,
    p => p.Class = "my-class")

这让你输入的属性，你可以通过添加属性到合适的子类MvcInputBuilder自定义每个扩展方法强类型和智能。

This gives you strong typing and intellisense for input properties, which you could customise for each extension method by adding properties to an appropriate MvcInputBuilder subclass.

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