ASP.NET上传图片类

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

/// <summary>
/// UploadFilePic 的摘要说明
/// </summary>
public class UploadFilePic
{
string picType="";
private string dirUrl="";
private string NewFileName = "";
private int fileLength = 0;
string weburl="";
public UploadFilePic()
{
//
// TODO: 在此处添加构造函数逻辑
//
}
/// <summary>
/// 设置图片格式以|分割
/// </summary>
public string _PicType
{
set
{

picType = value;
if (picType == "")
{
picType = "JPEG";
}
}
}
public string _dirUrl {
set {
dirUrl = value;
}
}
public string _weburl
{
get
{
return weburl;
}
set
{
weburl = value;
}
}

/// <summary>
/// 上传文件的大小，以 Kb为单位
/// </summary>
public int FileLength
{
get
{
if (fileLength != 0) return fileLength;
return 1024;
}
set
{
fileLength = value * 1024;
}
}

/// <summary>
/// 新文件名称
/// </summary>
public string _NewFileName
{
get
{
return NewFileName;
}
set
{
NewFileName = value;
}
}

public void UploadPic(FileUpload FileUpload1)
{

string filename;//文件名字
string hz;
string newname;
int lenpic =0;//图片大小
filename = FileUpload1.FileName;
lenpic = FileUpload1.PostedFile.ContentLength;
string FileType=FileUpload1.PostedFile.ContentType;
FileType = FileType.Substring(0, FileType.IndexOf("/"));
if (FileType.CompareTo("image") != 0) {
HttpContext.Current.Response.Write("<script>alert('图片只支持－－－" + picType + "');history.back();</script>");
HttpContext.Current.Response.End();
}
if (lenpic > fileLength) {
HttpContext.Current.Response.Write("<script>alert('图片大小超出范围,只允许上传的大小为"+fileLength +"kb');history.back();</script>");
HttpContext.Current.Response.End();
}
//取后最
int pos = filename.IndexOf(".");
hz = filename.Substring((pos + 1)).ToUpper();
string[] Type_pic = picType.Split('|');
bool yes =false;
if (Type_pic != null)
{

for (int i = 0; i < Type_pic.Length; ++i)
{

if (hz.CompareTo(Type_pic[i].ToUpper()) == 0)
{

yes = true;
break;
}

}
if (yes == false)
{
HttpContext.Current.Response.Write("<script>alert('图片只支持－－－" + picType + "');history.back();</script>");
HttpContext.Current.Response.End();
}
}

newname = sjname() + "." + hz;
NewFileName = weburl + newname;
//保存图片
string pathurl;
pathurl = HttpContext.Current.Server.MapPath("~") + dirUrl+newname;
string kb = FileUpload1.FileContent.Length.ToString();

FileUpload1.PostedFile.SaveAs(pathurl);

}

/// <summary>
/// 产生个随即名称
/// </summary>
/// <returns></returns>
public string sjname()
{

string sj = null;
sj = DateTime.Now.Year.ToString() + DateTime.Now.Month.ToString() + DateTime.Now.Day.ToString() + DateTime.Now.TimeOfDay.Hours.ToString() + DateTime.Now.TimeOfDay.Minutes.ToString() + DateTime.Now.TimeOfDay.Milliseconds.ToString();
return sj;

}
}
public enum pictype
{
gif = 0,
jpg = 1,
jpeg = 2,
bmp = 3,
swf = 4,

}