FileUpload上传组件在ASP.net中最简单的运用示例

//*******************************************************************************************
string Savepath = Server.MapPath("~/UploadFile/");
string temp = this.FileUpload.FileName;
bool fileok = false;
string newfilename = string.Empty;
if (this.FileUpload.HasFile)
{
string fileException = System.IO.Path.GetExtension(this.FileUpload.FileName).ToLower();

string[] allowedException ={ ".gif", ".bmp", ".png", ".jpg" };
for (int i = 0; i < allowedException.Length; i++)
{
if (fileException == allowedException[i])
fileok = true;
}
}
if (fileok)//图片才上传
{
try
{
newfilename = TourNewsHelper.GetNewFileName(this.FileUpload.FileName);
if (File.Exists(Savepath + newfilename) != false)
{
this.FileUpload.SaveAs(Savepath + newfilename);
}
}
catch (Exception ex)
{
CommonHelper.DoUpAlert(this.Page, "图片上传失败！");
}
}
else
{
CommonHelper.DoUpAlert(this.Page, "只允许上传gif、bmp、png、jpg图片");
}

public static string GetNewFileName(string FileName)
{
//跟据文件名产生一个由时间+随机数组成的一个新的文件名
string newfilename = DateTime.Now.Year.ToString() + DateTime.Now.Month.ToString()
+ DateTime.Now.Day.ToString() + DateTime.Now.Hour.ToString()
+ DateTime.Now.Second.ToString() + DateTime.Now.Minute.ToString()
+ DateTime.Now.Millisecond.ToString()
//+ rand.Next(1000).ToString()
+ FileName.Substring(FileName.LastIndexOf("."), FileName.Length - FileName.LastIndexOf("."));
return newfilename;
}

//****************************************************************************************
获得文件类型的方法还有：
string fileContentType = FileUpload1.PostedFile.ContentType;
if (fileContentType == "image/bmp" || fileContentType == "image/gif" || fileContentType == "image/pjpeg")

*****************************************************************************
private void UpFile()
{
if ((UpLoadFile.PostedFile.ContentLength > 0))
{ ///首先取到上载文件的原始名称
String fileName =
UpLoadFile.PostedFile.FileName.Substring(UpLoadFile.PostedFile.FileName.LastIndexOf("\\"),
UpLoadFile.PostedFile.FileName.Length - UpLoadFile.PostedFile.FileName.LastIndexOf("\\"));
///取到当前时间的年、月、日、分、秒和毫秒的值，并使用字符串格式把它们组合成一个字符串
String fileTime = DateTime.Now.Year.ToString() + DateTime.Now.Month.ToString()
+ DateTime.Now.Day.ToString() + DateTime.Now.Hour.ToString()
+ DateTime.Now.Second.ToString() + DateTime.Now.Minute.ToString()
+ DateTime.Now.Millisecond.ToString();
///在时间字符串后面添加一个随机数和文件的后缀名
fileName = "\\" + fileTime + GetRandomint()
+ fileName.Substring(fileName.IndexOf("."), fileName.Length - fileName.IndexOf("."));
if (File.Exists(Server.MapPath(Request.ApplicationPath) + "file://upload/" + fileName) == false)
{
///上载文件到服务器硬盘
UpLoadFile.PostedFile.SaveAs(Server.MapPath(Request.ApplicationPath) + "file://upload/"
+ fileName);
}
else
{
Response.Write("<script>alert(\"此文件已经存在，请重新命名你的文件！\")</script>");
}
}
else
{
Response.Write("<script>alert(\"文件名和内容不能为空！\")</script>");
}
}

private String GetRandomint()
{
Random random = new Random();
return (random.Next(10000).ToString()); //产生一个小于10000的随机正整数
}
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删除上传的文件：File.Delete(Server.MapPath(Request.ApplicationPath) + @"file://upload/200583016538151246.gif");