c# - 在自定义 Html Helper 中获取 Action 的 MvcHtmlString

Question

我正在尝试构建一个自定义 html 帮助器，它将根据传递给此 html 帮助器的操作显示动态内容，这是我到目前为止所拥有的

// 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来获取我拥有的 ActionResult 的内容(action、controller、routeData)

换句话说，我怎样才能得到mvchtmlstring形式的Action？

感谢任何帮助

Answer 1

您可以使用以下内容

解决方案一

1. 添加对 System.Web.Mvc.Html 的引用;
2. ChildActionExtensions.Action(YourHtmlHelper, action,controller,routeData);

所以你的代码将变得像

// 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();
    }
}

和您的区域 Html 助手

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

解决方案二

还有另一种方法可以实现您想要的效果，您可以制作如下所示的内容

// 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();
    }
}

并且在您的代码中，您执行以下操作，尽管我认为名称应该是 CustomArea 而不是 CustomButton。

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

希望这对你有帮助