asp.net fileUpload不会上传同一文件两次

Question

我检查了这个问题的几种解决方案，当你第一次上传 a.jpg 时没问题，但当你再次上传 a.jpg 时，它就不起作用了。再次上传 a.jpg 的唯一方法是上传 b.jpg。我的代码看起来像这样 <p>Select file to upload:</p>    <asp:FileUpload ID="FileUploader" runat="server" Width="1000px" /> <br />服务器代码如下所示protected void FileUploadButton_Click(object sender, EventArgs e)    {        try        {            //File upload logic. Returns path of uploaded file            string filePath = Server.MapPath("~/Files/") + Path.GetFileName(FileUploader.PostedFile.FileName);            //File save to server. Saves file name as uploaded by user to folder, "Files" on the server            string path = System.IO.Path.Combine("~/Files/",Path.GetFileName(FileUploader.PostedFile.FileName));            FileUploader.SaveAs(Server.MapPath(path));            //Function to insert values in excel sheet to database            InsertIntoDatabase(filePath)        }        catch (Exception Ex)        {        }//End try    }//End FileUpload 我读过将 fileUploader 放在更新面板上的解决方案。我还尝试在上传文件后重命名该文件。这有效，但它破坏了我的逻辑

Answer 1

我重新保存了文件，然后服务器认为它不处理相同的文件

  protected void FileUploadButton_Click(object sender, EventArgs e)

    {

        try

        {

            //File upload logic. Returns path of uploaded file

            string filePath = Server.MapPath("~/Files/") + Path.GetFileName(FileUploader.PostedFile.FileName);

            //File save to server. Saves file name as uploaded by user to folder, "Files" on the server

            string path = System.IO.Path.Combine("~/Files/",Path.GetFileName(FileUploader.PostedFile.FileName));

            string day = DateTime.Now.ToString("ss_mm_hh_dd_MM_yyyy");

            FileUploader.SaveAs(Server.MapPath(path));

            //Function to insert values in excel sheet to database

            InsertIntoDatabase(filePath)

             //Resave file to keep track of uploaded files

            File.Copy(filePath, day + filePath);

            File.Delete(filePath);

        }

        catch (Exception Ex)

        {

        }//End try

    }//End FileUpload