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");