不要覆盖通过FileUpload控件上传的文件 [英] Don't overwrite file uploaded through FileUpload control

问题描述

通过以​​下code：

 保护无效的button1_Click（对象发件人，EventArgs的发送）
    {
        如果（FileUpload1.HasFile）
        {
            串fileExt =
               System.IO.Path.GetExtension（FileUpload1.FileName）;            如果（fileExt ==的.jpg|| fileExt ==.JPEG|| fileExt ==符.gif|| fileExt ==png格式）
            {
                尝试
                {
                    FileUpload1.SaveAs（使用Server.Mappath（../上传/原稿/+ FileUpload1.FileName））;
                    Label1.Text =文件名：+
                        FileUpload1.PostedFile.FileName +＆LT; BR＆gt;中+
                        FileUpload1.PostedFile.ContentLength +KB＆LT; BR＆gt;中+
                        内容类型：+
                        FileUpload1.PostedFile.ContentType;
                }
                赶上（异常前）
                {
                    Label1.Text =错误：+ ex.Message.ToString（）;
                }
            }
            其他
            {
                Label1.Text =只有图像文件不允许的！
            }
        }
        其他
        {
            Label1.Text =您还没有指定的文件。
        }
    }
 

我希望让这个文件是否存在它改变了它的名字，有没有内置的功能，这？经典的ASP有一个参数，所以，当你上传说house.jpg，然后再次将成为住宅（1）.JPG等等等等这是很有用的。

解决方案

 变种文件名= file.FileName;
VAR延长= Path.GetExtension（文件名）;
VAR nameWithoutExtension = Path.GetFileNameWithoutExtension（文件名）;变种I = 1;
而（File.Exists（uploadFolder +文件名））
{
    文件名= nameWithoutExtension.Trim（）+（+ I +）+扩展名;
    我++;
}file.SaveAs（uploadFolder +文件名）;
 

With the following code:

    protected void Button1_Click(object sender, EventArgs e)
    {
        if (FileUpload1.HasFile)
        {
            string fileExt =
               System.IO.Path.GetExtension(FileUpload1.FileName);

            if (fileExt == ".jpg" || fileExt == ".jpeg" || fileExt == ".gif" || fileExt == ".png")
            {
                try
                {
                    FileUpload1.SaveAs(Server.MapPath("../uploads/originals/" + FileUpload1.FileName));
                    Label1.Text = "File name: " +
                        FileUpload1.PostedFile.FileName + "<br>" +
                        FileUpload1.PostedFile.ContentLength + " kb<br>" +
                        "Content type: " +
                        FileUpload1.PostedFile.ContentType;
                }
                catch (Exception ex)
                {
                    Label1.Text = "ERROR: " + ex.Message.ToString();
                }
            }
            else
            {
                Label1.Text = "Only image files are allowed!";
            }
        }
        else
        {
            Label1.Text = "You have not specified a file.";
        }


    }

I want to make it so that if the file exists it changes the name of it, is there any built in functionality for this? Classic ASP had a parameter so that when you upload say house.jpg, and then again it would become house(1).jpg etc etc which was useful.

解决方案

var fileName = file.FileName;
var extension = Path.GetExtension(fileName);
var nameWithoutExtension = Path.GetFileNameWithoutExtension(fileName);

var i = 1;
while (File.Exists(uploadFolder + fileName))
{
    fileName = nameWithoutExtension.Trim() + " (" + i + ")" + extension;
    i++;
}

file.SaveAs(uploadFolder + fileName);

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