图片或者文件上传控件的使用
1：拖入FileUpload控件
商品图片
<
asp:FileUpload
ID
="FileUpload1"
runat
="server"
/>
<
asp:Button
ID
="Button1"
runat
="server"
Text
="上传"
onclick
="Button1_Click"
/>
2:拖入预览图片控件Image
<
asp:Image
ID
="Image1"
runat
="server"
ImageUrl
="../upload/none.jpg"
ToolTip
="none.jpg"
Height
="140px"
Width
="220px"
/>
// ToolTip="none.jpg" 注 意很重要
3:在三层外的公共类库utility中建立文件tool.cs 注意要添加引入System.web
using
System;
using
System.Collections.Generic;
using
System.Linq;
using
System.Text;
using
System.Text.RegularExpressions;
using
System.Web.UI;
using
System.Web.UI.WebControls;
using
System.IO;
using
System.Net.Mail;
using
System.Net;
namespace
xh.shop.Utility
{
public
class
tool
{
///
<summary>
过滤非法字符串
///
///
</summary>
///
<param name="value"></param>
///
<returns></returns>
public
static
string
GetSafeSQL(
string
value)
{
if
(
string
.IsNullOrEmpty(value))
return
string
.Empty;
value
=
Regex.Replace(value,
@"
;
"
,
string
.Empty);
value
=
Regex.Replace(value,
@"
'
"
,
string
.Empty);
value
=
Regex.Replace(value,
@"
&
"
,
string
.Empty);
value
=
Regex.Replace(value,
@"
%20
"
,
string
.Empty);
value
=
Regex.Replace(value,
@"
--
"
,
string
.Empty);
value
=
Regex.Replace(value,
@"
==
"
,
string
.Empty);
value
=
Regex.Replace(value,
@"
<
"
,
string
.Empty);
value
=
Regex.Replace(value,
@"
>
"
,
string
.Empty);
value
=
Regex.Replace(value,
@"
%
"
,
string
.Empty);
return
value;
}
///
<summary>
上传文件方法
///
返回文件名
///
</summary>
///
<param name="myFileUpload">
上传控件ID
</param>
///
<param name="allowExtensions">
允许上传的扩展文件名类型,如：string[] allowExtensions = { ".doc", ".xls", ".ppt", ".jpg", ".gif" };
</param>
///
<param name="maxLength">
允许上传的最大大小，以M为单位
</param>
///
<param name="savePath">
保存文件的目录，注意是绝对路径,如：Server.MapPath("~/upload/");
</param>
public
static
string
Upload(FileUpload myFileUpload,
string
[] allowExtensions,
int
maxLength,
string
savePath)
{
//
文件格式是否允许上传
bool
fileAllow
=
false
;
//
检查是否有文件案
if
(myFileUpload.HasFile)
{
//
检查文件大小, ContentLength获取的是字节，转成M的时候要除以2次1024
if
(myFileUpload.PostedFile.ContentLength
/
1024
/
1024
>=
maxLength)
{
throw
new
Exception(
"
只能上传小于
"
+
maxLength
+
"
M的文件！
"
);
}
//
取得上传文件之扩展文件名，并转换成小写字母
string
fileExtension
=
System.IO.Path.GetExtension(myFileUpload.FileName).ToLower();
string
tmp
=
""
;
//
存储允许上传的文件后缀名
//
检查扩展文件名是否符合限定类型
for
(
int
i
=
0
; i
<
allowExtensions.Length; i
++
)
{
tmp
+=
i
==
allowExtensions.Length
-
1
?
allowExtensions[i] : allowExtensions[i]
+
"
,
"
;
if
(fileExtension
==
allowExtensions[i])
{
fileAllow
=
true
;
}
}
if
(fileAllow)
{
try
{
string
datedir
=
DateTime.Now.ToString(
"
yyyyMMdd
"
);
if
(
!
Directory.Exists(savePath
+
datedir))
{
Directory.CreateDirectory(savePath
+
datedir);
}
string
saveName
=
Guid.NewGuid()
+
fileExtension;
string
path
=
savePath
+
datedir
+
"
/
"
+
saveName;
//
存储文件到文件夹
myFileUpload.SaveAs(path);
return
datedir
+
"
/
"
+
saveName;
}
catch
(Exception ex)
{
throw
new
Exception(ex.Message);
}
}
else
{
throw
new
Exception(
"
文件格式不符，可以上传的文件格式为：
"
+
tmp);
}
}
else
{
throw
new
Exception(
"
请选择要上传的文件！
"
);
}
}
}
}
4：前台拖入Btn按钮 点击进入后台
protected
void
Button1_Click(
object
sender, EventArgs e)
{
try
{
string
proimg
=
xh.shop.Utility.tool.Upload(FileUpload1,
new
string
[] {
"
.jpg
"
,
"
.gif
"
,
"
.png
"
},
2
, Server.MapPath(
"
~/upload/
"
));
//
文件类型与大小保存路径
Image1.ImageUrl
=
"
~/upload/
"
+
proimg;
//
预览路径
Image1.ToolTip
=
proimg;
}
catch
(Exception ex)
{
Response.Write(
"
<script language='JavaScript'>alert('
"
+
ex.Message
+
"
')</script>
"
);
}
}