Question

Doing a file upload to an aspx page from C#. Getting a:

PathTooLongException
The specified path, file name, or both are too long. The fully qualified file name must be less than 260 characters, and the directory name must be less than 248 characters.

Here’s the code:

            try
            {
                using (var client = new WebClient())
                {
                    String url =
                        String.Format(
                            "http//localhost:49536/ManualUploadTest.aspx?key={0}&name={1}&address={2}&phone={3}&email={4}&node={5}",
                            "changeme",
                            "john",
                            "10 Downing Street",
                            "555 555 6165",
                            "[e-mail]",
                            "TestNode");

                    var len = url.Length;  // this length is 146 
                    var encodeLen = HttpUtility.UrlEncode(url).Length; // this length is 180

                    //client.BaseAddress = "http//localhost:49536";

                    byte[] result = client.UploadFile(HttpUtility.UrlEncode(url), path);

                    // throws exception during UploadFile
                    // ... more code here

The url string looks like this:

http//localhost:49536/ManualUploadTest.aspx?key=changeme&name=john&address=10 Downing Street&phone=555 555 6165&email=[e-mail]&node=TestNode

The path is:

Y:\\10mb.zip

Thanks for any help!

Answer 1

Try fixing the URL: http://... instead of http//...; also, I’d use the Uri class and not UrlEncode().

Uri url = new Uri(String.Format("http://localhost:49536/ManualUploadTest.aspx?key={0}&name={1}&address={2}&phone={3}&email={4}&node={5}",
                                HttpUtility.UrlEncode("changeme"),
                                HttpUtility.UrlEncode("john"),
                                HttpUtility.UrlEncode("10 Downing Street"),
                                HttpUtility.UrlEncode("555 555 6165"),
                                HttpUtility.UrlEncode("[e-mail]"),
                                HttpUtility.UrlEncode("TestNode")));
byte[] result = client.UploadFile(url, path);

---

Edit: I tracked down the reason for exception… if you supply a string, it tries to create a Uri internally (which fails because of the malformed protocol http//), then it tries to get the full path for the Uri using Path.GetFullPath(url), and this then fails with the PathTooLongException.