如何删除以上传的文件？急啊，高分求救！

Question

Javascript:
public void DeleteImage_OnClick(object sender, EventArgs e) {
if (FileToDelete.Value != "" && FileToDelete.Value != "undefined") {
try {
string AppPath = HttpContext.Current.Request.PhysicalApplicationPath;
System.IO.File.Delete(AppPath  + CurrentImagesFolder.Value + "\\" + FileToDelete.Value);
ResultsMessage.Text = "Deleted: " + FileToDelete.Value;
} catch(Exception ex) {
ResultsMessage.Text = "There was an error.";
}
} else {
ResultsMessage.Text = NoFileToDeleteMessage;
}
DisplayImages();
}

Answer 1

从数据库取出文件名,加上硬盘的绝对路径,再删除. 参考代码:private void DeletePic(int id)
{
    string sqlstr="select pic from product where id=" +id.ToString();
    OleDbConnection conn=new OleDbConnection(Application.Get("connstr").ToString());
    conn.Open();
    OleDbCommand cmd=new OleDbCommand(sqlstr,conn);
    cmd.CommandType=CommandType.Text;
    string picPath=((object)cmd.ExecuteScalar()).ToString();
    if (picPath.Length!=0) 
    {
int i= picPath.LastIndexOf(@"\");
//取得文件名
string fileName =picPath.Substring(i); picPath=Application.Get("uploadpath").ToString()+fileName;
if(File.Exists(picPath))
{
    File.Delete(picPath);
}
    }
    sqlstr="select smallpic from product where id="+id.ToString();
    cmd.CommandText=sqlstr;
    cmd.CommandType=CommandType.Text;
    picPath=((object)cmd.ExecuteScalar()).ToString();
    if (picPath.Length!=0) 
    {
int i= picPath.LastIndexOf(@"\");
//取得文件名
string fileName =picPath.Substring(i); picPath=Application.Get("uploadpath").ToString()+fileName;
if(File.Exists(picPath))
{
    File.Delete(picPath);
}
    }
    conn.Close();
}

Answer 2

System.IO.File.Delete("c:\\temp\\file.bak")

Answer 3

按照 river168(海阔天空.net)的方法,可以的.