如何将文件从fileupload保存到root diectory上的文件夹

问题描述

我正在尝试将图片文件上传到〜/ Pictures /。 FileUpload因为非null的imagename和ext而起作用。结果是没有图像存储在〜/ Pictures /中，没有错误消息。

I am trying to upload an image file to "~/Pictures/". The FileUpload has worked because of a non null imagename and ext. The result is no image is stored in "~/Pictures/" with no error message.

if (FileUpload1.HasFile)
            {
                string imagename = System.IO.Path.GetFileName(FileUpload1.FileName);
                Label1.Text = imagename;
                string ext = System.IO.Path.GetExtension(FileUpload1.FileName);
                Label2.Text = ext;
                string imagefile = Server.MapPath("Pictures/" + imagename);
                byte[] Image = null;
                if (ext == ".jpg" | ext == ".gif" | ext == ".png" | ext == ".bmp")
                {
                    Image = new byte[FileUpload1.PostedFile.ContentLength];
                    HttpPostedFile UploadedImage = FileUpload1.PostedFile;
                    UploadedImage.InputStream.Read(Image, 0, (int)FileUpload1.PostedFile.ContentLength);
                    UploadedImage.SaveAs(imagefile);
                }
            }

我的尝试：



尝试文件流传输byte [] Image。

What I have tried:

Tried Filestreaming the byte[] Image.

推荐答案

string imagefile = Server.MapPath("Pictures/" + imagename);

你从中得到的路径将是相对于当前页面 - 如果你想要一个绝对路径，你需要指定根文件夹：

The path you get from that will be relative to the location of the current page - if you want an absolute path, you need to specify the root folder:

string imagefile = Server.MapPath("~/Pictures/" + imagename);

其次，正如理查德所说，你需要检查你的扩展名：C＃字符串默认区分大小写，所以.JPG与.jpg不一样例如。 Windows并不关心文件名或扩展名的情况，但C＃确实如此！

第三，为什么在直接通过 [] - 我不确定SaveAs方法是否会将您读取的流重新回到Image数组中。

Second, as Richard says, you need to check your extension: C# strings are by default case sensitive, so ".JPG" is not the same as ".jpg" for example. Windows doesn't care about the case on file names or extensions, but C# does!
Third, why are you reading the stream when you can just get the bytes directly via the FileUpload.FileBytes Property (System.Web.UI.WebControls)[^] - I'm not sure that the SaveAs method rewinds the stream that you read into the Image array.

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