[英]How to Create a Generic Method and Create Instance of The Type
I want to create a helper method that I can imagine has a signature similar to this: 我想创建一个我可以想象的具有类似于以下特征的助手方法:
public static MyHtmlTag GenerateTag<T>(this HtmlHelper htmlHelper, object obj)
{
// how do I create an instance of MyAnchor?
// this returns MyAnchor, which has a MyHtmlTag base
}
When I invoke the method, I want to specify a type of MyHtmlTag, such as MyAnchor, eg: 当我调用该方法时,我想指定MyHtmlTag的类型,例如MyAnchor,例如:
<%= Html.GenerateTag<MyAnchor>(obj) %>
or 要么
<%= Html.GenerateTag<MySpan>(obj) %>
Can someone show me how to create this method? 有人可以告诉我如何创建此方法吗?
Also, what's involved in creating an instance of the type I specified? 另外,创建我指定的类型的实例涉及什么? Activator.CreateInstance()
? Activator.CreateInstance()
吗?
Thanks 谢谢
Dave 戴夫
You'd use Activator.CreateInstance<T>
: 您将使用Activator.CreateInstance<T>
:
public static MyHtmlTag GenerateTag<T>(this HtmlHelper htmlHelper, object obj)
{
T value = Activator.CreateInstance<T>();
// Set properties on value/ use it/etc
return value;
}
There's existing functionality in MvcContrib you may want to check out called " FluentHtml ". MvcContrib中有现有功能,您可能要签出一个名为“ FluentHtml ”的功能。 It looks like this: 看起来像这样:
<%=this.TextBox(x => x.FirstName).Class("required").Label("First Name:")%>
<%=this.Select(x => x.ClientId).Options((SelectList)ViewData["clients"]).Label("Client:")%>
<%=this.MultiSelect(x => x.UserId).Options(ViewModel.Users)%>
<%=this.CheckBox("enabled").LabelAfter("Enabled").Title("Click to enable.").Styles(vertical_align => "middle")%>
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