如何定义MVC动作的名称并调用它

本文关键字：调用 何定义 定义 MVC | 更新日期: 2023-09-27 17:52:46

我有一个Helper类，它将当前控制器设置为活动导航栏项。它还可以用于下拉导航。

public static MvcHtmlString MenuItem(
this HtmlHelper htmlHelper,
string text,
string action,
string controller,
Dictionary<string, string> dropdown
)
{
    var li = new TagBuilder("li");
    var dropdownList = new TagBuilder("ul");
    var routeData = htmlHelper.ViewContext.RouteData;
    var currentAction = routeData.GetRequiredString("action");
    var currentController = routeData.GetRequiredString("controller");
    if (string.Equals(currentAction, action, StringComparison.OrdinalIgnoreCase) &&
        string.Equals(currentController, controller, StringComparison.OrdinalIgnoreCase))
    {
        li.AddCssClass("active");
    }
    li.AddCssClass("menuitem");
    if(dropdown != null)
    {
        li.AddCssClass("dropdown");
        foreach (var item in dropdown)
        {
            var dropdownli = new TagBuilder("li");
            dropdownli.InnerHtml = htmlHelper.ActionLink(item.Key, item.Key, item.Value, null, null).ToHtmlString();
            dropdownList.InnerHtml += dropdownli;
        }
        dropdownList.AddCssClass("dropdown-menu");
        li.InnerHtml = htmlHelper.ActionLink(text, action, controller, null, new { @class="dropdown-toggle", data_toggle="dropdown"}).ToHtmlString() + dropdownList.ToString();
    }
    else
    {
        li.InnerHtml = htmlHelper.ActionLink(text, action, controller).ToHtmlString();
    }
    return MvcHtmlString.Create(li.ToString());
}
Helper类在_Layout中被调用。CSHTML: 
@Html.MenuItem("Home", "Index", "Home", null)
@Html.MenuItem("News", "Index", "News", null)
@Html.MenuItem("Media", "Index", "Media",
         new Dictionary<string, string>() {{ "Photos", "Media" }, 
                                           { "Videos", "Media" }})
@Html.MenuItem("Events", "Index", "Events", 
    new Dictionary<string, string>() {{ "FirstEvent", "Events" }, 
                                      { "SecondEvent", "Events" }})
@Html.MenuItem("Donate", "Index", "Donate", 
    new Dictionary<string, string>() {{ "Sponsor", "Donate" }})

问题是，对于每个导航栏项，每个链接的名称都是操作的名称，这意味着如果操作是"FirstEvent"，它将显示为"FirstEvent"而不是"FirstEvent"。

无论如何，我可以做一些像[ActionName("First Event")]设置名称，然后在Helper类调用它?

[ActionName("Culture Show")]
    public ActionResult CultureShow()
    {
        return View();
    }

如何定义MVC动作的名称并调用它

您可以使用反射来扫描动作方法的ActionName属性，但似乎更简单的解决方案是使用模型而不是字典。

public class HyperlinkDataModel
{
    public string LinkText { get; set; }
    public string ActionName { get; set; }
    public string ControllerName { get; set; }
}
@Html.MenuItem("Events", "Index", "Events", 
    new[] {
        new HyperlinkDataModel {
            ActionName = "FirstEvent", ControllerName = "Events", LinkText = "First Event" 
        }, 
        new HyperlinkDataModel {
            ActionName = "SecondEvent", ControllerName = "Events", LinkText = "Second Event"
        }
    })

然后在HtmlHelper中这样做:

public static MvcHtmlString MenuItem(
this HtmlHelper htmlHelper,
string text,
string action,
string controller,
IList<HyperlinkDataModel> dropdown
)
{
    ...
    foreach (var item in dropdown)
    {
        var dropdownli = new TagBuilder("li");
        dropdownli.InnerHtml = htmlHelper.ActionLink(item.LinkText, item.ActionName,
            item.ControllerName, null, null).ToHtmlString();
        dropdownList.InnerHtml += dropdownli;
    }
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