当我的图像为空时，IE将其绘制成红十字。有没有办法避免画红十字架？
或者因为我有asp图像我可以让它看不见，但是我需要检查这个图像是否包含某些内容。
<asp:Image ID="Image1" runat="server" ImageUrl="Handler.ashx"/>
我需要加载到byte [] x = {??? };图像/ jpeg格式的白色像素
我的解决方案让我发疯！ 这是它：
<%@ WebHandler Language="C#" Class="Handler" %>
using System;
using System.IO;
using System.Web;
using Auth;
using System.Configuration;
public class Handler : IHttpHandler
{
public bool IsReusable
{ get{ return false; } }
public void ProcessRequest(HttpContext context)
{
context.Response.Clear();
context.Response.ContentType = "image/jpeg";
byte[] imageContent = Auth.User.GetImageFromDataBase();
if (imageContent != null)
context.Response.OutputStream.Write(imageContent, 0, imageContent.Length);
else
{
byte[] x = {0xff, 0xd8, 0xff, 0xe0, 0x0, 0x10, 0x4a, 0x46, 0x49, 0x46, 0x0, 0x1, 0x2, 0x0, 0x0, 0x64,
0x0, 0x64, 0x0, 0x0, 0xff, 0xec, 0x0, 0x11, 0x44, 0x75, 0x63, 0x6b, 0x79, 0x0, 0x1, 0x0,
0x4, 0x0, 0x0, 0x0, 0x1b, 0x0, 0x0, 0xff, 0xee, 0x0, 0xe, 0x41, 0x64, 0x6f, 0x62, 0x65,
0x0, 0x64, 0xc0, 0x0, 0x0, 0x0, 0x1, 0xff, 0xdb, 0x0, 0x84, 0x0, 0x11, 0xc, 0xc, 0xc,
0xd, 0xc, 0x11, 0xd, 0xd, 0x11, 0x19, 0x10, 0xe, 0x10, 0x19, 0x1d, 0x16, 0x11, 0x11, 0x16,
0x1d, 0x22, 0x17, 0x17, 0x17, 0x17, 0x17, 0x22, 0x21, 0x1a, 0x1d, 0x1c, 0x1c, 0x1d, 0x1a, 0x21,
0x21, 0x26, 0x28, 0x2b, 0x28, 0x26, 0x21, 0x34, 0x34, 0x38, 0x38, 0x34, 0x34, 0x41, 0x41, 0x41,
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0x11, 0x8, 0x0, 0x64, 0x0, 0x64, 0x3, 0x1, 0x22, 0x0, 0x2, 0x11, 0x1, 0x3, 0x11, 0x1,
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0x43, 0xdc, 0xad, 0x73, 0x9b, 0xd5, 0x11, 0x75, 0x2a, 0xe3, 0x3e, 0x74, 0x35, 0x66, 0x5a, 0xc7,
0x2b, 0xde, 0x61, 0xb1, 0x2c, 0x4c, 0xe3, 0xd6, 0x65, 0x64, 0x6f, 0x73, 0x5b, 0x22, 0x2c, 0x98,
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0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x7, 0xff, 0xd9};
context.Response.OutputStream.Write(x, 0, x.Length);
}
}
}
答案 0 :(得分：3)
如果handler.ashx文件中的图片为空，最好显示默认图片。我们在内联网上为电话簿做同样的事情。