Question

我正在尝试构建一个自定义html帮助程序，它将根据传递给此html帮助程序的Action显示动态内容，这是我目前所拥有的

// the Area helper class
public static class AreaHelper
{
      public static AreaBuilder CustomArea(this HtmlHelper helper)
      {
           return new AreaBuilder();
      }
}
// the area builder class
public class AreaBuilder: IHtmlString
{
    private string name;
    private string caption;
    private string action;
    private string controller;
    private object routeData;

    public AreaBuilder Name(string name)
    {
        this.name=name;
        return this;
    }

    public AreaBuilder Action(string action,string controller,object routeData)
    {
        this.action=action;
        this.controller=controller;
        this.routeData=routeData;
        return this;
    }

    public string ToHtmlString()
    {
         var html=new StringBuilder();
         html.AppendFormat(@"<div id=""{0}"" class=""area"">",name);
         html.AppendFormat(@"<div class=""area-caption"">{0}</div>",caption);
         html.AppendFormat(@"<div class=""area-content"">{0}</div>",**what should i do here**);
         html.Append("</div>");
         return html.ToString();
    }
}

我无法执行正确的步骤以获取ActionResult的内容，即我拥有它的url（action，controller，routeData）

换句话说，我如何将Action作为mvchtmlstring？

感谢任何帮助

Answer 1

您可以使用以下

解决方案I

Add reference to System.Web.Mvc.Html;
ChildActionExtensions.Action(YourHtmlHelper, action,controller,routeData);

所以你的代码会变得像

// the area builder class
public class AreaBuilder: IHtmlString
{
    private string name;
    private string caption;
    private string action;
    private string controller;
    private object routeData;
    private HtmlHelper htmlHelper;

    public AreaBuilder Name(string name)
    {
        this.name=name;
        return this;
    }

    public AreaBuilder HtmlHelper(HtmlHelper helper)
    {
        this.htmlHelper=helper;
        return this;
    }

    public AreaBuilder Action(string action,string controller,object routeData)
    {
        this.action=action;
        this.controller=controller;
        this.routeData=routeData;
        return this;
    }

    public string ToHtmlString()
    {
         var html=new StringBuilder();
         html.AppendFormat(@"<div id=""{0}"" class=""area"">",name);
         html.AppendFormat(@"<div class=""area-caption"">{0}</div>",name);
         html.AppendFormat(@"<div class=""area-content"">{0}</div>",ChildActionExtensions.Action(htmlHelper, action,controller,routeData));
         html.Append("</div>");
         return html.ToString();
    }
}

和你的区域Html助手

// the Area helper class
public static class AreaHelper
{
      public static AreaBuilder CustomArea(this HtmlHelper helper)
      {
           return new AreaBuilder().HtmlHelper(helper);
      }
}

解决方案II

还有另一种方法可以实现您的目标，您可以制作以下内容

// the area builder class
public class AreaBuilder: IHtmlString
{
    private string name;
    private string caption;
    private MvcHtmlString content; // to allow the use to add html content

    public AreaBuilder Name(string name)
    {
        this.name=name;
        return this;
    }

    public AreaBuilder Content(Func<object, HelperResult> html)
    {
        var detail=html.Invoke(null);
        this.content=MvcHtmlString.Create(detail.ToHtmlString());
        return this;
    }

    public string ToHtmlString()
    {
         var html=new StringBuilder();
         html.AppendFormat(@"<div id=""{0}"" class=""area"">",name);
         html.AppendFormat(@"<div class=""area-caption"">{0}</div>",caption);
         html.AppendFormat(@"<div class=""area-content"">{0}</div>",content.ToHtmlString());
         html.Append("</div>");
         return html.ToString();
    }
}

并在您的代码中执行以下操作，即使我认为该名称应该是CustomArea而不是CustomButton。

@Html.CustomArea().Name("MyArea").Content(@<text>@Html.Action("YourAction","YourController",...your routing data)</text>)

希望这会对你有所帮助

Answer 2

据我所知，您可能最好在HtmlHelper上构建扩展方法，如下所示：

public static MvcHtmlString AreaButton(this HtmlHelper htmlHelper, string areaName, string linkText, string actionName, string controllerName, object routeData = null, object htmlAttributes = null)
{
    var div = new TagBuilder("div");
    div.AddCssClass("area");
    div.GenerateId(areaName);

    var caption = new TagBuilder("div");
    caption.AddCssClass("area-caption");
    caption.InnerHtml = areaName;

    div.InnerHtml = caption.ToString();

    var content = new TagBuilder("div");
    content.AddCssClass("area-content");
    content.InnerHtml = htmlHelper.ActionLink(linkText, actionName, controllerName, routeData, htmlAttributes).ToHtmlString();

    div.InnerHtml += content.ToString();

    return MvcHtmlString.Create(div.ToString());
}

这个方法需要在静态类中定义，我已经省略了。扩展HtmlHelper允许您利用框架中已有的工具（如TagBuilder），并利用辅助类中已有的所有工具（如ViewContext）。要使用，请执行以下操作：

@Html.AreaButton("admin", "Administration", "index", "home", new { area="admin" }, new { /* attributes to add the link itself */ })

如果您正在尝试构建指向某个区域的链接，则需要将“area”值添加到您传递给ActionLink帮助程序方法的路径字典中，如上所示。

在自定义Html Helper中获取Action的MvcHtmlString

2 个答案: