asp.net-mvc-2 – 带有数组/列表的ASP.NET MVC 2模型
发布时间:2020-12-15 20:39:56 所属栏目:asp.Net 来源:网络整理
导读:我正在ASP.NET MVC中创建我的第一个站点,这是一种学习的方式.但我遇到了一个我无法找到解决方案的问题. 我希望我的用户能够创建附有歌曲和标签的专辑. 这可能是一个未指定数量的歌曲和标签.但必须至少有5首歌曲和2个标签. 但我无法弄清楚如何通过模型实现这
我正在ASP.NET MVC中创建我的第一个站点,这是一种学习的方式.但我遇到了一个我无法找到解决方案的问题.
我希望我的用户能够创建附有歌曲和标签的专辑. 但我无法弄清楚如何通过模型实现这一目标,这是我能够走多远. public class AlbumCreateModel { [Required] [DisplayName("Title")] public string Title { get; set; } [DisplayName("Description")] public string Description { get; set; } [DisplayName("Publish")] public bool Public { get; set; } [DisplayName("Tags")] // Min 2 tags no max public List<AlbumTagModel> Tags { get; set; } [DisplayName("Songs")] // Min 5 songs no max public List<AlbumSongModel> Songs { get; set; } } public class AlbumTagModel { [Required] [DisplayName("Tag")] // Regex to test no spaces // min 2 characters // maximum 15 characters public string Tag { get; set; } } public class AlbumSongModel { [Required] [DisplayName("Title")] public string Title { get; set; } [Required] [DisplayName("Artist")] public string Artist { get; set; } [DisplayName("Description")] public string Description { get; set; } [DisplayName("Song Length")] public double Length { get; set; } [DisplayName("Year")] public int Description { get; set; } } 视图: <%@ Page Title="" Language="C#" MasterPageFile="~/App/Views/Shared/MasterPage.Master" Inherits="System.Web.Mvc.ViewPage<album.App.Models.AlbumCreateModel>" %> <asp:Content ID="Content1" ContentPlaceHolderID="TitleContent" runat="server"> Create </asp:Content> <asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server"> <% using (Html.BeginForm()) { %> <%: Html.ValidationSummary(true,"Committing the album was unsuccessful. Please correct the errors and try again.")%> <div> <fieldset> <legend>Album Information</legend> <div class="editor-label"> <%: Html.LabelFor(m => m.Title) %> </div> <div class="editor-field"> <%: Html.TextBoxFor(m => m.Title)%> <%: Html.ValidationMessageFor(m => m.Title)%> </div> <div class="editor-label"> <%: Html.LabelFor(m => m.Description) %> </div> <div class="editor-field"> <%: Html.TextAreaFor(m => m.Description)%> <%: Html.ValidationMessageFor(m => m.Description)%> </div> <!-- Tags here --> <!-- Songs here --> <p> <input type="submit" value="Commit" /> </p> </fieldset> </div> <% } %> </asp:Content> <asp:Content ID="Content3" ContentPlaceHolderID="MetaData" runat="server"> </asp:Content> 可能的解决方案: 模型: public class PlaylistModel { [Required] [DisplayName("Title")] public string Title { get; set; } [DisplayName("Description")] public string Description { get; set; } [DisplayName("Publish")] public bool Public { get; set; } [DisplayName("Tags")] [ListCount(Min = 2)] // Min 2 tags no max public List<PlaylistTagModel> Tags { get; set; } [DisplayName("Songs")] [ListCount(Min = 5)] public List<PlaylistSongModel> Songs { get; set; } } public class PlaylistTagModel { [Required] [DisplayName("Tag")] // Regex to test no spaces // min 2 characters // maximum 15 characters public string Tag { get; set; } } public class PlaylistSongModel { [Required] [DisplayName("Title")] public string Title { get; set; } [Required] [DisplayName("Artist")] public string Artist { get; set; } [DisplayName("Description")] public string Description { get; set; } [DisplayName("Song Length")] public int Length { get; set; } [DisplayName("Year")] public int Year { get; set; } } 视图: <%@ Page Title="" Language="C#" MasterPageFile="~/App/Views/Shared/MasterPage.Master" Inherits="System.Web.Mvc.ViewPage<playlist.App.Models.PlaylistModel>" %> <asp:Content ID="Content1" ContentPlaceHolderID="TitleContent" runat="server"> Create </asp:Content> <asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server"> <% using (Html.BeginForm()) { %> <%: Html.ValidationSummary(true,"Committing the playlist was unsuccessful. Please correct the errors and try again.")%> <div> <fieldset> <legend>Playlist Information</legend> <div class="editor-label"> <%: Html.LabelFor(m => m.Title) %> </div> <div class="editor-field"> <%: Html.TextBoxFor(m => m.Title)%> <%: Html.ValidationMessageFor(m => m.Title)%> </div> <div class="editor-label"> <%: Html.LabelFor(m => m.Description) %> </div> <div class="editor-field"> <%: Html.TextAreaFor(m => m.Description)%> <%: Html.ValidationMessageFor(m => m.Description)%> </div> <br /> <%: Html.ValidationMessageFor(m => m.Tags)%> <div class="editor-label"> <%: Html.LabelFor(m => m.Tags)%> </div> <div class="editor-field"> <%: Html.EditorFor(m => m.Tags) %> <%: Html.Editor("Tags[" + (Model == null ? 0 : Model.Tags.Count) + "]","PlaylistTagModel")%> </div> <br /> <%: Html.ValidationMessageFor(m => m.Songs)%> <div class="editor-label"> <%: Html.LabelFor(m => m.Songs)%> </div> <div class="editor-field"> <%: Html.EditorFor(m => m.Songs)%> <%: Html.Editor("Songs[" + (Model == null ? 0 : Model.Songs.Count) + "]","PlaylistSongModel")%> </div> <p> <input type="submit" value="Commit" /> </p> </fieldset> </div> <% } %> </asp:Content> <asp:Content ID="Content3" ContentPlaceHolderID="MetaData" runat="server"> </asp:Content> 这两个模板: <%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl<playlist.App.Models.PlaylistSongModel>" %> <fieldset> <legend>Song Information</legend> <%: Html.ValidationSummary(true,"Committing this song was unsuccessful. Please correct the errors and try again.")%> <div class="editor-label"> <%: Html.LabelFor(m => m.Title) %> </div> <div class="editor-field"> <%: Html.TextBoxFor(m => m.Title)%> <%: Html.ValidationMessageFor(m => m.Title)%> </div> <div class="editor-label"> <%: Html.LabelFor(m => m.Artist)%> </div> <div class="editor-field"> <%: Html.TextBoxFor(m => m.Artist)%> <%: Html.ValidationMessageFor(m => m.Artist)%> </div> <div class="editor-label"> <%: Html.LabelFor(m => m.Description)%> </div> <div class="editor-field"> <%: Html.TextAreaFor(m => m.Description)%> <%: Html.ValidationMessageFor(m => m.Description)%> </div> <div class="editor-label"> <%: Html.LabelFor(m => m.Length)%> </div> <div class="editor-field"> <%: Html.TextBoxFor(m => m.Length)%> <%: Html.ValidationMessageFor(m => m.Length)%> </div> <div class="editor-label"> <%: Html.LabelFor(m => m.Year)%> </div> <div class="editor-field"> <%: Html.TextBoxFor(m => m.Year)%> <%: Html.ValidationMessageFor(m => m.Year)%> </div> </fieldset> 标签: <%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl<playlist.App.Models.PlaylistTagModel>" %> <span class="tag"><%: Html.TextBoxFor(m => m.Tag)%></span> <%: Html.ValidationMessageFor(m => m.Tag)%> 最后我的自定义验证器列出: public class ListCountAttribute : ValidationAttribute { public int Min { get; set; } public int Max { get; set; } public override bool IsValid(object value) { if (Min == 0 && Max == 0) return true; if (value == null) return false; if (!(value is ICollection)) throw new InvalidOperationException("ListCountAttribute requires underlying property to implement ICollection"); ICollection countable = value as ICollection; if (Min == 0 && Max != 0) return countable.Count <= Max; else if (Max == 0 && Min != 0) return countable.Count >= Min; return (countable.Count >= Min) && (countable.Count <= Max); } public override string FormatErrorMessage(string name) { if (Min == 0 && Max != 0) return "The field set " + name + " can not be larger then " + Max; else if (Max == 0 && Min != 0) return "The field set " + name + " need to have atleast a count of " + Min; return "The field set " + name + " need to between or equal to " + Min + " and " + Max; } } 解决方法
在/ views / shared中创建一个名为“EditorTemplates”的文件夹.
必须完全称之为. 在此文件夹中,创建名为AlbumTagModel.ascx和AlbumSongModel.ascx的文件强烈键入其各自的模型. 在这些文件中添加输入字段,但不要将它们包装在表单标记中. 回到您的视图页面中: <%: Html.EditorFor(m => m.Tags)%> 和 <%: Html.EditorFor(m => m.Songs)%> 瞧! 渲染输入标记时,将下标以匹配您的列表. EditorFor将循环并呈现所有内容. 要添加新歌曲/标签,请将以下内容添加到您的AlbumViewModel: public AlbumTagModel NewTagModel {get;set;} 并为它添加额外的EditorFor(). 当您的模型发布NewTagModel有效时,将其添加到列表并重新显示视图. (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |
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