Asp.net server. mappath method note page 1/2

When creating a customer promotion system, there is a template management module in which the Administrator needs to add a template, including the template name, description, and thumbnail. The image uploading function is provided here, I used a traditional method for uploading and testing. However, after I publish an image, I create a virtual directory for the folder that stores the image and grant the write permission to the directory. However, when I upload the image, it always fails. I have never encountered such a situation before, and I think it is very strange. So I try my best to solve it.

First, check the permission of the upload directory. I added the write and modify permissions of the network service user, but the result still failed. Then I set the permission to everyone or not, which does not seem to be a permission issue.

Then, delete the virtual directory andProgramThe directory re-creates the folder for storing images (which has been deleted before release), and grants the write permission to the folder. The results are uploaded successfully and displayed normally.

Next, I copied the uploaded image to the original virtual directory and re-created the virtual directory. The result is displayed successfully.

After these checks and ideas, I have summarized that files can be uploaded and displayed normally. It seems that there is a problem with the conversion between directories and virtual directories during upload, then I continue to review what I wroteCode.

the current simple code, in which upload is the image storage directory, where I create a virtual directory, and spread is the upper directory. I suddenly found that the original server. mappath did not point to the root directory of the image storage, and it felt a little strange, and then it was modified. copy Code the code is as follows: string fullname = This. fileupload2.postedfile. filename;
string type = fullname. substring (fullname. lastindexof ('. ') + 1);
If (! Phototypes. isexist (type. tolower ()
{< br> BMC. clutility. showmessage (this. page, "only images in JPEG, jpe, GIF, BMP, and PNG formats can be uploaded! ");
return;
}< br> string filename =" upload/"+ system. datetime. now. tostring ("yymmddhhmmss") + ". "+ type;
try
{< br> string temp = server. mappath ("~ /Spread ");
This. fileupload2.postedfile. saveas (temp +"/"+ filename);
This. image2.imageurl = "~ /Spread/"+ filename;
This. image2.visible = true;
}< br> catch
{< br> BMC. clutility. showmessage (this. page, "An error occurred while uploading the file! ");
}

The modified code is as follows, and the result can be uploaded and displayed normally. It seems that the problem is indeed here.Copy codeThe Code is as follows: String fullname = This. fileupload2.postedfile. filename;
String type = fullname. substring (fullname. lastindexof ('.') + 1 );
If (! Phototypes. isexist (type. tolower ()))
{
BMC. clutility. showmessage (this. Page, "only images in JPEG, jpe, GIF, BMP, and PNG formats can be uploaded! ");
Return;
}
String filename = system. datetime. Now. tostring ("yymmddhhmmss") + "." + type;
Try
{
String temp = server. mappath ("~ /Spread/upload ");
This. fileupload2.postedfile. saveas (temp + "/" + filename );
This. image2.imageurl = "~ /Spread/upload/"+ filename;
This. image2.visible = true;
}
Catch
{
BMC. clutility. showmessage (this. Page, "An error occurred while uploading the file! ");
}