[英]Debugging code in a view (asp.net mvc2)
如何在asp.net mvc2中的視圖應用程序中調試代碼?
昨晚經過進度編輯 :
好吧,現在我有以下內容:
在Shared\\EditorTemplates\\Equipment.ascx
:
<%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl<DAT.Models.Item>" %>
<% using (Html.BeginForm()) {%>
<%: Html.ValidationSummary(true) %>
<div class="editor-label">
<%: Html.Label("Item ID") %>
<%: Html.TextBoxFor(model => model.ItemID) %>
<%: Html.ValidationMessageFor(model => model.ItemID) %>
</div>
<div class="editor-label">
<%: Html.LabelFor(model => model.ModelID) %>
<%: Html.DropDownListFor(x => x.Model.Model1, new SelectList(Model.Model.Model1, "ModelId", "Model", Model.ModelID)) %>
<%: Html.ValidationMessageFor(model => model.ModelID) %>
</div>
...
在Item\\Edit.aspx
:
<%@ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage<DAT.ViewModels.ItemEditViewModel>" %>
<% using (Html.BeginForm()) {%>
<%: Html.ValidationSummary(true) %>
<fieldset>
<legend>Fields</legend>
<%: Html.EditorFor(model => model.Item) %>
<p>
<input type="submit" value="Save" />
</p>
</fieldset>
控制器:
public ActionResult Edit(int id)
{
var models = from p in database.Models.Where(x => x.Model1 != null) select p;
var viewModel = new ViewModel
{
Things = database.Things.Single(a => a.ItemID == id),
//tried this:
//Models = database.Models
Models = models
};
return View(viewModel);
}
所以我確定問題出在這條線上
<%: Html.DropDownListFor(x => x.Model.Model1, new SelectList(Model.Model.Model1, "ModelId", "Model", Model.ModelID)) %>
生成選擇列表時,第一個參數沒有IEnumerable嗎? 或者我輸入的值之一導致空值。 如何在我的視圖中獲取模型列表?
拔出所有頭發后進行編輯:
看來問題出在以下示例中: http : //www.asp.net/mvc/tutorials/mvc-music-store-part-4 。 奇怪的是,我不確定它是否遵循最佳實踐。 看一下代碼以及它們如何傳遞模型-使用ViewData [“ Blah”]和模型也顯得晦澀難懂,為什么不能將它們全部作為模型發送? 看一下代碼他們是如何做到的:
Album.ascx:
<%@ Import Namespace="MvcMusicStore"%>
<%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl<MvcMusicStore.Models.Album>" %>
<script src="/Scripts/MicrosoftAjax.js" type="text/javascript"></script>
<script src="/Scripts/MicrosoftMvcAjax.js" type="text/javascript"></script>
<script src="/Scripts/MicrosoftMvcValidation.js" type="text/javascript"></script>
<p>
<%: Html.LabelFor(model => model.Title)%>
<%: Html.TextBoxFor(model => model.Title)%>
<%: Html.ValidationMessageFor(model => model.Title)%>
</p>
<p>
<%: Html.LabelFor(model => model.Price)%>
<%: Html.TextBoxFor(model => model.Price)%>
<%: Html.ValidationMessageFor(model => model.Price)%>
</p>
<p>
<%: Html.LabelFor(model => model.AlbumArtUrl)%>
<%: Html.TextBoxFor(model => model.AlbumArtUrl)%>
<%: Html.ValidationMessageFor(model => model.AlbumArtUrl)%>
</p>
<p>
<%: Html.LabelFor(model => model.Artist)%>
<%: Html.DropDownList("ArtistId", new SelectList(ViewData["Artists"] as IEnumerable, "ArtistId", "Name", Model.ArtistId))%>
</p>
<p>
<%: Html.LabelFor(model => model.Genre)%>
<%: Html.DropDownList("GenreId", new SelectList(ViewData["Genres"] as IEnumerable, "GenreId", "Name", Model.GenreId))%>
</p>
視圖:
<%@ Page Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage<MvcMusicStore.ViewModels.StoreManagerViewModel>" %>
<asp:Content ID="Content1" ContentPlaceHolderID="TitleContent" runat="server">
Edit - <%: Model.Album.Title %>
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">
<h2>Edit Album</h2>
<% Html.EnableClientValidation(); %>
<% using (Html.BeginForm()) {%>
<fieldset>
<legend>Edit Album</legend>
<%: Html.EditorFor(model => model.Album, new { Artists = Model.Artists, Genres = Model.Genres}) %>
<p>
<input type="submit" value="Save" />
</p>
</fieldset>
<% } %>
<div>
<%:Html.ActionLink("Back to Albums", "Index") %>
</div>
</asp:Content>
查看模型:
using System.Collections.Generic;
using MvcMusicStore.Models;
namespace MvcMusicStore.ViewModels
{
public class StoreManagerViewModel
{
public Album Album { get; set; }
public List<Artist> Artists { get; set; }
public List<Genre> Genres { get; set; }
}
}
和控制器:
//
// GET: /StoreManager/Edit/5
public ActionResult Edit(int id)
{
var viewModel = new StoreManagerViewModel
{
Album = storeDB.Albums.Single(a => a.AlbumId == id),
Genres = storeDB.Genres.ToList(),
Artists = storeDB.Artists.ToList()
};
return View(viewModel);
}
因此,在我看來,模型內置在控制器中對我來說是合乎邏輯的。 然后在視圖中,他們使用此語句,這引起了我的困惑:
<%: Html.EditorFor(model => model.Album, new { Artists = Model.Artists, Genres = Model.Genres}) %>
該模型正在拆分/更改,現在我們將其他模型(藝術家,流派)作為ViewData發送? 有人可以解釋,這完全適合整個設計模式嗎?
您可以在控制器動作中設置一個斷點,並分析模型並查看數據。
ViewData
,為什么要同時使用強類型視圖和ViewData
? 確保ViewData["Models"] as IEnumerable
不為null(在您的控制器中),或者最好將其除去,並將其作為強類型屬性放入模型中。 我也建議您使用強類型的輔助器DropDownListFor
:
<%: Html.DropDownListFor(
x => x.ModelID,
new SelectList(Model.Models, "ModelId", "Model", Model.ModelID)
)%>
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