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
