34

我这样称呼我的部分观点:

 <% Html.RenderPartial("~/controls/users.ascx"); %>

我可以将参数传递给局部视图吗?我将如何在实际的 users.ascx 页面中访问它们?

4

4 回答 4

32

You could pass a model object to the partial (for example a list of strings):

<% Html.RenderPartial("~/controls/users.ascx", new string[] { "foo", "bar" }); %>

Then you strongly type the partial and the Model property will be of the appropriate type:

<%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl<System.Collections.Generic.IEnumerable<string>>" %>

<% foreach (var item in Model) { %>
    <div><%= Html.Encode(item) %></div>
<% } %>
于 2009-12-15T17:49:39.073 回答
17

There is another overload for RenderPartial that will pass your model through.

<% Html.RenderPartial("~/controls/users.ascx", modelGoesHere); %>

How to access? Just like you normally would with any view:

<%= Model.MagicSauce %>
于 2009-12-15T17:48:17.950 回答
6

花了一些时间才明白,但 MVC 意味着您以一种或另一种方式使用模型、视图和控制器来处理几乎所有事情,包括部分视图。起初,这三个元素如何组合在一起可能有点令人生畏。直到现在我才做过一个,而且它有效——哇哦!

希望这对下一个人有所帮助.... 抱歉,我使用的是 razor 而不是 .Net 表单。我还将数据从 SQL Server 数据库提取到开发人员可能使用的实体框架中。我也可能对 WebGrid 有点过分了,它比 foreach 语句要优雅得多。一个基本的@webgrid.GetHtml() 将显示每一列和每一行。

背景

在这个工作示例中,用户上传了图片。他们的图片使用局部视图以编辑形式显示。ImageID 和 FileName 元数据保存在 SQL Server 中,而文件本身保存在 ~/Content/UserPictures 目录中。

我知道它有点大,因为没有显示上传和编辑个人数据的所有细节。只关注使用局部视图的密切相关部分,尽管加入了一些额外的 EF。命名空间是 S&G 的 MVCApp3。

部分视图模型ViewModels.cs

除了 ImageID 和 FileName 之外,SQL Server 图像表还包括更多列,例如 [Caption]、[Description]、MD5 哈希以防止多次上传同一图像,以及上传日期。ViewModel 将实体提炼到用户查看其图片所需的最低限度。

public class Picts
{
    public int ImageID { get; set; }
    public string FileName { get; set; }
}

主视图视图Edit.cshtml

请注意强制类型转换/转换为 ViewData[]。

 @Html.Partial(
      partialViewName: "Picts", 
      model: (IEnumerable<MVCApp3.Models.Picts>)ViewData["Picts"]
 )

如果您没有将强类型模型设置为用于局部视图,您将收到“传递到字典中的模型项的类型为 'System.Data.Entity.DynamicProxies... ”错误,因为它假定您'正在传递父/主模型。

部分视图查看Picts.cshtml(显示整个文件内容)

@model IEnumerable<MVCApp3.Models.Picts>
@{
    var pictsgrid = new WebGrid(Model);
}
    @pictsgrid.GetHtml(
        tableStyle: "grid",
        displayHeader: false,
        alternatingRowStyle: "alt",
        columns: pictsgrid.Columns( 
            pictsgrid.Column(format:@<text><img src="@Url.Content("~/Content/Users/" + @item.FileName)" alt="@item.ImageID" width="200" />
            @Html.ActionLink(linkText: "Delete", actionName: "DeletePicture", routeValues: new { id = @item.ImageID })
            </text>)
            ))

控制器IdentityController.cs

将数据内容设置为部分视图将使用的 ViewData["MyPartialViewModelKeyName"]。你可以给字典键任何你想要的名字,但我给它 ViewData["Picts"] 是为了与局部视图文件名和它的视图模型类定义保持一致。

因为图片可能在多个用户之间共享,所以在 Entity Framework 中存在一个多对多表,其中包含相应的 PITA 查询,使用嵌套的 froms 和内部连接来仅返回属于用户或与用户共享的图片:

public class IdentityController : Controller
{
    private EzPL8Entities db = new EzPL8Entities();

    // GET: /Identity/Edit/5
    [Authorize]
    public ActionResult Edit(int? id)
    {

        if (id == null)
            return new HttpNotFoundResult("This doesn't exist");

      // get main form data
      ezpl8_UsersPhysicalIdentity ezIDobj = db.ezpl8_UsersPhysicalIdentity.Find(id)

    // http://learnentityframework.com/LearnEntityFramework/tutorials/many-to-many-relationships-in-the-entity-data-model/
    // get partial form data for just this user's pictures
                ViewData["Picts"] = (from user in db.ezpl8_Users
                             from ui in user.ezpl8_Images
                             join image in db.ezpl8_Images
                             on ui.ImageID equals image.ImageID
                             where user.ezpl8_UserID == id
                             select new Picts
                             {
                                 FileName = image.FileName,
                                 ImageID = image.ImageID
                             }
                                 ).ToList();

        return View(ezIDobj);
    }

   //  Here's the Partial View Controller --not much to it!
    public ViewResult Picts(int id)
    {
       return View(ViewData["Picts"]);
    }

    [Authorize]  //you have to at least be logged on
    public ActionResult DeletePicture(int id)
    {
        //ToDo:  better security so a user can't delete another user's picture 
        //    TempData["ezpl8_UserID"]
        ezpl8_Images i = db.ezpl8_Images.Find(id);
        if (i != null)
        {
            var path = System.IO.Path.Combine(Server.MapPath("~/Content/Users"), i.FileName);
            System.IO.File.Delete(path: path);

            db.ezpl8_Images.Remove(i);
            db.SaveChanges();
        }
        return Redirect(Request.UrlReferrer.ToString());
    }

    protected override void Dispose(bool disposing)
    {
        db.Dispose();
        base.Dispose(disposing);
    }
}
于 2012-06-12T19:04:29.920 回答
0
// get main form data
ezpl8_UsersPhysicalIdentity ezIDobj = db.ezpl8_UsersPhysicalIdentity.Find(id)

// http://learnentityframework.com/LearnEntityFramework/tutorials/many-to-many-relationships-in-the-entity-data-model/
// get partial form data for just this user's pictures
            ViewData["Picts"] = (from user in db.ezpl8_Users
                         from ui in user.ezpl8_Images
                         join image in db.ezpl8_Images
                         on ui.ImageID equals image.ImageID
                         where user.ezpl8_UserID == id
                         select new Picts
                         {
                             FileName = image.FileName,
                             ImageID = image.ImageID
                         }
                             ).ToList();

    return View(ezIDobj);
}

// 这里是局部视图控制器——没什么大不了的!公共 ViewResult Picts(int id) { return View(ViewData["Picts"]); }

[Authorize]  //you have to at least be logged on
public ActionResult DeletePicture(int id)
{
    //ToDo:  better security so a user can't delete another user's picture 
    //    TempData["ezpl8_UserID"]
    ezpl8_Images i = db.ezpl8_Images.Find(id);
    if (i != null)
    {
        var path = System.IO.Path.Combine(Server.MapPath("~/Content/Users"), i.FileName);
        System.IO.File.Delete(path: path);

        db.ezpl8_Images.Remove(i);
        db.SaveChanges();
    }
    return Redirect(Request.UrlReferrer.ToString());
}

protected override void Dispose(bool disposing)
{
    db.Dispose();
    base.Dispose(disposing);
}

}

于 2013-08-16T12:36:59.727 回答