通行證從局部視圖佈局視圖

更新任意數據：看來我是想設置一個部分鑑於ViewBag內容，而不是一個平原觀點，MVC3使得它很容易做到這一點。我仍然感興趣的是爲什麼它不適用於部分視圖，即爲什麼viewbag與部分視圖不共享。通行證從局部視圖佈局視圖

我試圖用ViewData/ViewBag

// Used in the partial view 
public static void RequireAssets(this HtmlHelper helper, params Asset[] assets) 
{ 
    var alreadyRequired = helper.ViewData["RequiredAssets"] as List<Asset>; 
    if (alreadyRequired == null) 
    { 
     alreadyRequired = new List<Asset>();    
     helper.ViewData.Add("RequiredAssets", alreadyRequired); 
    } 

    foreach (var asset in assets.Where(anAsset => !alreadyRequired.Contains(anAsset))) 
     alreadyRequired.Add(asset); 
} 

// Used in the layout view 
public static MvcHtmlString RenderAssetStyles(this HtmlHelper helper) 
{ 
    var requiredAssets = helper.ViewData["RequiredAssets"] as List<Asset>; 
    return requiredAssets == null ? null : GetStyleSheets(requiredAssets.Select(e => new StyleSheet(e)).ToArray()); 
} 

public static MvcHtmlString RenderAssetScripts(this HtmlHelper helper) 
{ 
    var requiredAssets = helper.ViewData["RequiredAssets"] as List<Asset>; 
    return requiredAssets == null ? null : GetScripts(requiredAssets.Select(e => new Script(e)).ToArray()); 
}

問題從局部視圖佈局視圖通過一些數據是，當RenderAssetStyles /腳本佈局燒製查看ViewData不包括鍵「RequiredAssets」

使用

_Layout.cshtml：

<title>@ViewBag.Title</title>  
@Html.RenderAssetStyles()

PartialView.cshtml：

@{ 
    Html.RequireAssets(Assets.Grid, Assets.FileUpload); 
}

來源

2012-04-17 Boris B.

我無法重現這一點。我不得不簡化你的代碼並做出一些假設。但以下工作適合我。

_Layout.cshtml

@using MyProject.Helpers 
<title>@ViewBag.Title</title>  
@Html.RenderAssetStyles() 
@Html.RenderAssetScripts() 
@RenderBody()

View.cshtml

@using MyProject.Helpers 
@{ 
    ViewBag.Title = "View"; 
    Html.RequireAssets(Asset.Grid, Asset.FileUpload); 
    Layout = "~/Views/Shared/_Layout.cshtml"; 
}

Helpers.cs

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Web; 
using System.Web.Mvc; 

namespace MyProject.Helpers 
{ 
    public enum Asset 
    { 
     Grid=1, 
     FileUpload=2 
    } 
    public static class Helper 
    { 

     public static void RequireAssets(this HtmlHelper helper, params Asset[] assets) 
     { 
      var alreadyRequired = helper.ViewData["RequiredAssets"] as List<Asset>; 
      if (alreadyRequired == null) 
      { 
       alreadyRequired = new List<Asset>(); 
       helper.ViewData.Add("RequiredAssets", alreadyRequired); 
      } 

      foreach (var asset in assets.Where(anAsset => !alreadyRequired.Contains(anAsset))) 
       alreadyRequired.Add(asset); 
     } 

     // Used in the layout view 
     public static MvcHtmlString RenderAssetStyles(this HtmlHelper helper) 
     { 
      var requiredAssets = helper.ViewData["RequiredAssets"] as List<Asset>; 
      return requiredAssets == null ? null : MvcHtmlString.Create("Test Style"); 
     } 

     public static MvcHtmlString RenderAssetScripts(this HtmlHelper helper) 
     { 
      var requiredAssets = helper.ViewData["RequiredAssets"] as List<Asset>; 
      return requiredAssets == null ? null : MvcHtmlString.Create("Test Script"); 
     } 
    } 

}

來源

2012-04-17 15:12:37

我會嘗試打破RequireAssets幫助器，然後每個MvcHtmlStrings檢查它們被調用的順序。我可以實現的唯一「複製」就是將所有內容都放在一個.cshtml文件中，在這種情況下，如果您在RenderAssetStyles/RenderAssetScripts之後調用了RequireAssets，那麼在需要它們的調用之前，您將不會設置任何資產。 – 2012-04-17 15:16:04

看來我把視圖渲染爲部分視圖，我已經更新了這個問題。 – 2012-04-20 14:33:17

http://stackoverflow.com/questions/4974027/modifying-mvc-3-viewbag-in-a-partial-view-does-not-persist-to-the-layout-cshtml可能有幫助 – 2012-04-20 21:24:19

認爲你做錯了什麼。無法轉載您的努力。嘗試檢查 - 您的視圖是否使用這種佈局。這一切都可以嘗試創建一個簡單的例子，這將是可重複的。

來源

2012-04-17 15:09:22 Ph0en1x

好像我是渲染視圖部分，我已經更新的問題。 – 2012-04-20 14:33:38

通行證從局部視圖佈局視圖

回答

相關問題