问题
I have 8 different files I'd like to upload.
Currently I'm using the code below. The following is just a snippet for uploading the first 2 files. It works great, but is soon going to start getting ugly as I start to add more and more file upload fields.
WebForm:
<p>
Thumb 1:<br />
<asp:FileUpload ID="img1sml" type="file" name="img1sml" runat="server" />
</p>
<p>
Image 1:<br />
<asp:FileUpload ID="img1" type="file" name="img1" runat="server" />
</p>...
CodeBehind: if (!string.IsNullOrWhiteSpace(img1sml.FileName))
{
img1sml.PostedFile.SaveAs(Server.MapPath("~/Images/" + img1sml.FileName));
img1.PostedFile.SaveAs(Server.MapPath("~/Images/" + img1.FileName));
// Create command
comm = new SqlCommand("INSERT INTO news (title, img1sml, img1, img1sml) VALUES (@Title, @img1sml, @img1)", conn);
// Add command parameters
I'd like to be able to test (in an efficient way) if each of the 8 file upload fields is empty or not. If they are empty I'd like to skip the file upload and db insertion and move to the next file.
How would you recommend I do this?
Many many thanks for any guidance with this.
回答1:
You can loop through a collection of posted files in the request object, called Request.Files
foreach (string key in Request.Files)
{
HttpPostedFile file = Request.Files[key];
if (file.ContentLength != 0)
{
file.SaveAs(Server.MapPath("~/Images/" + file.FileName));
}
}
来源：https://stackoverflow.com/questions/6145817/handling-multiple-optional-file-uploads-with-c-sharp-net