从数据库中mvc4 _layout显示图像 [英] Display image from database in _layout in mvc4

问题描述

大家好，我有我的 _layout 如下其中工程按我的要求，但这里有几件事情我得到了strucked即我想显示相应的对于我写的图像如下

  @if（会话[用户名]！= NULL）
{
 ＆LT; D​​IV CLASS =LOGGED_INID =user_navigation=服务器＆GT;
 ＆LT;标题=您的个人资料的href =＆GT;
 ＆LT; IMG ALT =SRC =@ Url.Action（GetPhoto，新的{PHOTOID =会话[用户名]}）HEIGHT =50WIDTH =50级=图片/＆GT;
＆所述; / A＆GT;
＆LT; / DIV＆GT;
}
 

但是，这是不是说明图像按需要我，所以可以有一个人帮助我，我想从数据库中显示图像用户登录后，我也想显示会议在一些控制值太

这是我的控制器code

 公众的ActionResult GetPhoto（字符串PHOTOID）
        {
            字节[]照片= NULL;
            变种V = db.tblUsers.Where（P =＆GT; p.UserName == PHOTOID）。选择（IMG = GT; img.Photo）.FirstOrDefault（）;
            照片= V;
            返回文件（照片，图像/ JPEG）;
        }
 

解决方案

您似乎有与℃的问题; IMG＆GT; 语法。它应该是这样的：

 ＆LT; IMG ALT =SRC =@ Url.Action（GetPhoto，用户，新{PHOTOID =会话[用户名]的ToString（）} ）HEIGHT =50WIDTH =50级=图片/＆GT;
 

根据你似乎已经习惯了在的WebForms实际code查看发动机（的意见章节＆lt;％= Html.En code（会话[用户名]） ％方式＆gt; ）

这是说你有这个code一个更为严重的问题。当前认证的用户不应该作为参数传递。这是一个巨大的安全漏洞。因此，通过摆脱它启动：

 ＆LT; IMG ALT =SRC =@ Url.Action（GetPhoto，用户），HEIGHT =50WIDTH =50级=照片/＆GT;
 

和那么你的控制器动作里面，你可以找回它：

 公众的ActionResult GetPhoto（）
{
    字符串用户=会话[用户名]作为字符串;
    字节[] =照片分贝
        .tblUsers
        。凡（P =＆GT; p.UserName ==用户）
        。选择（IMG = GT; img.Photo）
        .FirstOrDefault（）;
    返回文件（照片，图像/ JPEG）;
}
 

Hi all I am having my _layout as follows which works as per my requirement, but here there are couple of things I got strucked i.e I would like to display the corresponding image for that I write as follows

@if (Session["UserName"] != null)
{
 <div class="logged_in" id="user_navigation" runat="server">
 <a title="Your Profile" href="">
 <img alt="" src="@Url.Action("GetPhoto", new { photoId = Session["UserName"] })" height="50" width="50" class="photo" />
</a>
</div>
}

But this is not showing image as per required for me so can some one help me I would like to display the image from the database after user logged in also I would like to display the session values in some control too

This is my controller code

public ActionResult GetPhoto(string photoId)
        {
            byte[] photo = null;
            var v = db.tblUsers.Where(p => p.UserName == photoId).Select(img => img.Photo).FirstOrDefault();
            photo = v;
            return File(photo, "image/jpeg");
        }

解决方案

You seem to have a problem with the <img> syntax. It should be like this:

<img alt="" src="@Url.Action("GetPhoto","User", new { photoId = Session["UserName"].ToString() })" height="50" width="50" class="photo" />

According to the comments section you seem to have used the WebForms view engine in your actual code (<%= Html.Encode(Session["UserName"]) %>).

This being said you have a far more serious issue with this code. The currently authenticated user should never be passed as parameter. That's a huge security vulnerability. So start by getting rid of it:

<img alt="" src="@Url.Action("GetPhoto", "User")" height="50" width="50" class="photo" />

and then inside your controller action you could retrieve it:

public ActionResult GetPhoto()
{
    string user = Session["UserName"] as string;
    byte[] photo = db
        .tblUsers
        .Where(p => p.UserName == user)
        .Select(img => img.Photo)
        .FirstOrDefault();
    return File(photo, "image/jpeg");
}

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