我从数据库中检索图像并希望在控件中显示。
代码:
MemoryStream str= new MemoryStream();
byte[] n = (byte[])db.imagefile;
str.Write(n, 0, db.imagefile.Length);
如何在不使用处理程序的情况下将MemoryStream绑定到图像控件?
答案 0 :(得分:1)
您已经拥有数据库中的字节数组,因此您只需要将字节数组转换为 Base64 编码的字符串。
然后将Base64编码的字符串分配给asp:Image control的 ImageUrl 。
public class Database
{
public byte[] Imagefile { get; set; }
public Database()
{
// PNG Red dot
Imagefile = new byte[]
{
137,80,78,71,13,10,26,10,0,0,0,13,73,72,
68,82,0,0,0,10,0,0,0,10,8,6,0,0,0,141,50,
207,189,0,0,0,4,103,65,77,65,0,0,177,143,
11,252,97,5,0,0,0,9,112,72,89,115,0,0,11,
19,0,0,11,19,1,0,154,156,24,0,0,0,7,116,
73,77,69,7,214,6,1,23,57,40,29,23,87,226,0,
0,0,29,116,69,88,116,67,111,109,109,101,110,
116,0,67,114,101,97,116,101,100,32,119,105,
116,104,32,84,104,101,32,71,73,77,80,239,100,
37,110,0,0,0,93,73,68,65,84,24,211,189,204,
189,13,130,80,0,196,241,31,116,180,236,224,
22,76,224,50,14,224,46,206,193,8,54,38,132,
61,44,77,94,197,217,88,188,16,94,103,184,234,114,
31,127,254,173,110,31,132,203,207,14,29,235,
225,43,92,195,28,94,225,214,196,135,119,40,
225,19,158,117,215,87,163,9,165,202,182,48,
182,136,247,176,132,71,115,116,190,190,12,
146,26,23,123,74,217,138,0,0,0,0,73,69,78,
68,174,66,6,130
};
}
}
protected void Page_Load(object sender, EventArgs e)
{
var db = new Database();
Image1.ImageUrl = string.Concat("data:image/png;base64,",
Convert.ToBase64String(db.Imagefile));
}
截至2012年3月,以下网络浏览器支持数据URI:
三叉戟
Internet Explorer 8:Microsoft限制其对某些“不可导航”的支持。内容出于安全原因,包括担心嵌入在数据URI中的JavaScript可能无法被脚本过滤器解释,例如基于Web的电子邮件客户端使用的脚本过滤器。版本8中的数据URI必须小于32 KB。[3]仅支持以下元素和/或属性的数据URI:
Internet Explorer 9:Internet Explorer 9没有32KB限制并支持更多元素。
http://en.wikipedia.org/wiki/Data_URI_scheme#Web_browser_support