匿名类和IDictionary的区别ASP.NET MVC 中的 htmlAttributes？
例如，如果您检查这两个扩展方法，唯一的区别是 htmlAttributes 的类型，因此您可以通过两种不同的方式传递 htmlAttributes：
public static MvcHtmlString TextBoxFor<TModel, TProperty>(
this HtmlHelper<TModel> htmlHelper,
Expression<Func<TModel, TProperty>> expression,
IDictionary<string, object> htmlAttributes);
public static MvcHtmlString TextBoxFor<TModel, TProperty>(
this HtmlHelper<TModel> htmlHelper,
Expression<Func<TModel, TProperty>> expression,
object htmlAttributes);
并以以下任一方式使用它们：
@Html.TextBoxFor(model => model.TagLine,
new { @placeholder = "We live to make art." })
@Html.TextBoxFor(model => model.TagLine,
new Dictionary<string, object> {
{ "placeholder", "We live to make art." } })
我已经检查了 MVC 源代码，并且我知道它们在后台使用相同的方法，但是接受匿名对象的方法使用 HtmlHelper.AnonymousObjectToHtmlAttributes(htmlAttributes) 使匿名对象成为字典。
在我看来，使用匿名对象的视图更干净。你们觉得怎么样？使用匿名对象有什么缺点吗？
For example if you check these two extension methods the only difference is type of htmlAttributes so you can pass your htmlAttributes in two different ways:
public static MvcHtmlString TextBoxFor<TModel, TProperty>(
this HtmlHelper<TModel> htmlHelper,
Expression<Func<TModel, TProperty>> expression,
IDictionary<string, object> htmlAttributes);
public static MvcHtmlString TextBoxFor<TModel, TProperty>(
this HtmlHelper<TModel> htmlHelper,
Expression<Func<TModel, TProperty>> expression,
object htmlAttributes);
And use them in either of these ways:
@Html.TextBoxFor(model => model.TagLine,
new { @placeholder = "We live to make art." })
@Html.TextBoxFor(model => model.TagLine,
new Dictionary<string, object> {
{ "placeholder", "We live to make art." } })
I have checked MVC source code and I know in the background they use same method, but the one which accepts the anonymous object uses HtmlHelper.AnonymousObjectToHtmlAttributes(htmlAttributes) to make the anonymous object a dictionary.
In my point of view, views are cleaner to use anonymous object. What do you think guys? Are there any drawbacks to using an anonymous object?
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没有太大区别，但是使用匿名对象对于调用者来说是一种更清晰、更易读的语法，现在被认为是更标准的做法。如果您热衷于微优化，那么使用 IDictionary 可能会带来轻微的、可以忽略不计的性能优势。
IDictionary 重载选项可能自 ASP.NET MVC 1.0 CTP 时代起就一直存在，当时 C# 3.0 和匿名对象还很新。 Eilon Lipton 的博客文章建议 使用C# 3.0 匿名类型作为字典 提供了一些背景知识。
There's not too much difference, however using the anonymous object is a cleaner and more readable syntax for the caller, and now considered more standard practice. There might be a slight, negligible performance benefit to using IDictionary if you're a fan of micro-optimisation.
The IDictionary overload option has probably stuck since ASP.NET MVC 1.0 CTP days when C# 3.0 and anonymous objects were still quite new. Eilon Lipton's blog post proposing Using C# 3.0 Anonymous Types as Dictionaries gives some background.
IDictionary的存在有特殊原因。如果您想在扩展函数中调整 htmlAttributes 参数，那么这是可能的。我有几个 Html.TextBox 函数的扩展。例如，我有一个名为：TextBoxOrDisplayForNoDiaCritics的函数。此函数启用文本框或显示禁用的文本框。另外，它还会从文本框中删除 DiaCritics。我使用 Javascript 函数来完成此操作。onchange事件在输入标记上触发。因此，在此函数中，我将带有 javascript 函数名称的 onchange 事件添加到 htmlAttributes 列表中。如果我使用 IDictionary 那很容易，但是当我使用对象时就会困难得多。因此，当您开始项目时，重要的是要认识到 Html Helpers 必须服务的目的。就我而言，因为我认识到我的项目的重要性，所以我在项目中的任何地方都使用 IDictionary。
The
IDictionary<string, object>is there for a special reason. If you want to adjust the htmlAttributes parameter in a extended function then this is possible. I have several extensions of theHtml.TextBoxfunction. I have for example a function thats called:TextBoxOrDisplayForNoDiaCritics. This function enables a TextBox or displays a disabled textbox. Additional it also removes DiaCritics from the textbox. I do this with a Javascript function. The eventonchangefires on the input tag. So in this function I add that onchange event with the javascript function name to the htmlAttributes list. If I use a IDictionary thats easy but when I use an object that will be much harder.So when you start your project its important to recognize what purpose your Html Helpers have to serve. In my case because I recognize the importance in my project I use IDictionary everywhere in my Project.
克里斯回答了所有问题。
我给出了使用 IDictionary 的更多理由：在 MVC 3.0 之前，当您需要像“data-something”这样的 HTML5 属性时，您不能使用匿名对象：D
干杯
Chris answers all the thing.
I give 1 more reason why use IDictionary: Prior to MVC 3.0, you could not use anonymous object when you need a HTML5 attribute like "data-something" :D
Cheers