Invalid URI: The format of the URI could not be determined

Question

4.00/5 (1 vote)

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I keep getting this error:

C#

Line 24:         WebClient client = new WebClient();
Line 25:         client.DownloadFileCompleted += new AsyncCompletedEventHandler(client_DownloadFileCompleted);
Line 26:         client.DownloadFileAsync(new Uri(url), @"c:\");
Line 27:     }
Line 28:

this is my code:

C#

protected void dl001_Click(object sender, EventArgs e){
    string url = @"File.doc";
    WebClient client = new WebClient();
    client.DownloadFileCompleted += new AsyncCompletedEventHandler(client_DownloadFileCompleted);
    client.DownloadFileAsync(new Uri(url), @"c:\");
}

can somebody share me his comment? Thanks a lot. :)

Posted 28-Oct-12 3:02am

Ed Gepulle

Updated 28-Oct-12 3:09am

v2

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3 solutions

Solution 2

after amending the code i received this error:

Asynchronous operations are not allowed in this context. Page starting an asynchronous operation has to have the Async attribute set to true and an asynchronous operation can only be started on a page prior to PreRenderComplete event.

Posted 28-Oct-12 4:21am

Ed Gepulle

Comments

Thomas Daniels 28-Oct-12 10:28am

Then use DownloadFile instead of DownloadFileAsync

Solution 3

Thanks for your help it works!

Posted 28-Oct-12 5:06am

Ed Gepulle

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André Kraak · Accepted Answer · 2012-10-28T03:18:00

Both the URL and the local file are incomplete.

The URL should be something like "htpp://mysite.com//File.doc" and the local file @"C:\DownloadedFile.doc".

The behavior of the URL differs when the BaseAddress[^] is not empty as described in remarks section of WebClient.DownloadFileAsync Method (Uri, String)[^].

Quote: Remarks
If the BaseAddress property is not an empty string ("") and address does not specify an absolute URI, address must be a relative URI that is combined with BaseAddress to form the absolute URI of the requested data.

Invalid URI: The format of the URI could not be determined

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