在MVC项目中如何显示图片
首先,有好一阵没有怎么写博客文章了.实在也是很多事情,确实没有停下来过.
这两天在讲解MVC方面的知识和项目实践,其中有一个小的细节,是有关于图片显示方面的，记录下来供大家参考
在MVC项目中，要显示一个图片，尤其是该图片是存放在数据库的话，还是可以继续使用原先Web Forms的那种ashx的方式。但也可以考虑下面的方式
1.创建一个ImageResult
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Web.Mvc; using System.Drawing; using System.Drawing.Imaging; using System.Web; namespace Extensions { public class ImageResult : ActionResult { public ImageResult() { } public Image Image { get; set; } public ImageFormat ImageFormat { get; set; } public override void ExecuteResult(ControllerContext context) { // verify properties if (Image == null) { throw new ArgumentNullException("Image"); } if (ImageFormat == null) { throw new ArgumentNullException("ImageFormat"); } // output context.HttpContext.Response.Clear(); if (ImageFormat.Equals(ImageFormat.Bmp)) context.HttpContext.Response.ContentType = "image/bmp"; if (ImageFormat.Equals(ImageFormat.Gif)) context.HttpContext.Response.ContentType = "image/gif"; if (ImageFormat.Equals(ImageFormat.Icon)) context.HttpContext.Response.ContentType = "image/vnd.microsoft.icon"; if (ImageFormat.Equals(ImageFormat.Jpeg)) context.HttpContext.Response.ContentType = "image/jpeg"; if (ImageFormat.Equals(ImageFormat.Png)) context.HttpContext.Response.ContentType = "image/png"; if (ImageFormat.Equals(ImageFormat.Tiff)) context.HttpContext.Response.ContentType = "image/tiff"; if (ImageFormat.Equals(ImageFormat.Wmf)) context.HttpContext.Response.ContentType = "image/wmf"; Image.Save(context.HttpContext.Response.OutputStream, ImageFormat); } } }
2,创建一个Action
private string connection =ConfigurationManager.ConnectionStrings["northwind"].ConnectionString; public ActionResult Image(int id) { var db = new NorthwindDataContext(connection); var found = db.Employees.FirstOrDefault(e => e.EmployeeID == id); if (found != null) { var buffer = found.Photo.ToArray(); ImageConverter converter = new ImageConverter(); var image = (Image)converter.ConvertFrom(buffer); return new Extensions.ImageResult() { Image = image, ImageFormat = System.Drawing.Imaging.ImageFormat.Jpeg }; } else { ViewData["message"] = "员工不存在"; return View("Error"); } }
3.在页面（View）中调用
<%@ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage<Models.Employee>" %> <asp:Content ID="Content1" ContentPlaceHolderID="TitleContent" runat="server"> Update </asp:Content> <asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server"> <h2>Update</h2> <% using (Html.BeginForm()) {%> <%: Html.ValidationSummary(true) %> <fieldset> <legend>Fields</legend> <div style="float:right"> <img src="/Employee/Image/<%:Model.EmployeeID %>" alt="" /> </div> <div class="editor-label"> <%: Html.LabelFor(model => model.EmployeeID) %> </div> <div class="editor-field"> <%: Html.TextBoxFor(model => model.EmployeeID) %> <%: Html.ValidationMessageFor(model => model.EmployeeID) %> </div> <div class="editor-label"> <%: Html.LabelFor(model => model.LastName) %> </div> <div class="editor-field"> <%: Html.TextBoxFor(model => model.LastName) %> <%: Html.ValidationMessageFor(model => model.LastName) %> </div> <div class="editor-label"> <%: Html.LabelFor(model => model.FirstName) %> </div> <div class="editor-field"> <%: Html.TextBoxFor(model => model.FirstName) %> <%: Html.ValidationMessageFor(model => model.FirstName) %> </div> <div class="editor-label"> <%: Html.LabelFor(model => model.Title) %> </div> <div class="editor-field"> <%: Html.TextBoxFor(model => model.Title) %> <%: Html.ValidationMessageFor(model => model.Title) %> </div> <div class="editor-label"> <%: Html.LabelFor(model => model.TitleOfCourtesy) %> </div> <div class="editor-field"> <%: Html.TextBoxFor(model => model.TitleOfCourtesy) %> <%: Html.ValidationMessageFor(model => model.TitleOfCourtesy) %> </div> <div class="editor-label"> <%: Html.LabelFor(model => model.BirthDate) %> </div> <div class="editor-field"> <%: Html.TextBoxFor(model => model.BirthDate, String.Format("{0:g}", Model.BirthDate)) %> <%: Html.ValidationMessageFor(model => model.BirthDate) %> </div> <div class="editor-label"> <%: Html.LabelFor(model => model.HireDate) %> </div> <div class="editor-field"> <%: Html.TextBoxFor(model => model.HireDate, String.Format("{0:g}", Model.HireDate)) %> <%: Html.ValidationMessageFor(model => model.HireDate) %> </div> <div class="editor-label"> <%: Html.LabelFor(model => model.Address) %> </div> <div class="editor-field"> <%: Html.TextBoxFor(model => model.Address) %> <%: Html.ValidationMessageFor(model => model.Address) %> </div> <div class="editor-label"> <%: Html.LabelFor(model => model.City) %> </div> <div class="editor-field"> <%: Html.TextBoxFor(model => model.City) %> <%: Html.ValidationMessageFor(model => model.City) %> </div> <div class="editor-label"> <%: Html.LabelFor(model => model.Region) %> </div> <div class="editor-field"> <%: Html.TextBoxFor(model => model.Region) %> <%: Html.ValidationMessageFor(model => model.Region) %> </div> <div class="editor-label"> <%: Html.LabelFor(model => model.PostalCode) %> </div> <div class="editor-field"> <%: Html.TextBoxFor(model => model.PostalCode) %> <%: Html.ValidationMessageFor(model => model.PostalCode) %> </div> <div class="editor-label"> <%: Html.LabelFor(model => model.Country) %> </div> <div class="editor-field"> <%: Html.TextBoxFor(model => model.Country) %> <%: Html.ValidationMessageFor(model => model.Country) %> </div> <div class="editor-label"> <%: Html.LabelFor(model => model.HomePhone) %> </div> <div class="editor-field"> <%: Html.TextBoxFor(model => model.HomePhone) %> <%: Html.ValidationMessageFor(model => model.HomePhone) %> </div> <div class="editor-label"> <%: Html.LabelFor(model => model.Extension) %> </div> <div class="editor-field"> <%: Html.TextBoxFor(model => model.Extension) %> <%: Html.ValidationMessageFor(model => model.Extension) %> </div> <div class="editor-label"> <%: Html.LabelFor(model => model.Notes) %> </div> <div class="editor-field"> <%: Html.TextBoxFor(model => model.Notes) %> <%: Html.ValidationMessageFor(model => model.Notes) %> </div> <div class="editor-label"> <%: Html.LabelFor(model => model.ReportsTo) %> </div> <div class="editor-field"> <%: Html.TextBoxFor(model => model.ReportsTo) %> <%: Html.ValidationMessageFor(model => model.ReportsTo) %> </div> <div class="editor-label"> <%: Html.LabelFor(model => model.PhotoPath) %> </div> <div class="editor-field"> <%: Html.TextBoxFor(model => model.PhotoPath) %> <%: Html.ValidationMessageFor(model => model.PhotoPath) %> </div> <p> <input type="submit" value="Save" /> </p> </fieldset> <% } %> <div> <%: Html.ActionLink("Back to List", "Index") %> </div> </asp:Content>
最后的结果如下，大家可以参考参考
