C# how to solve the problem using webclient?

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Dear,

C# webclient, how to solve the problem about the download file name contain \ / : * ? " < > this symbols?

Best Regards.

Posted 15-May-11 20:59pm

tfyuhijk

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Abhinav S · Answer 1 · 2011-05-15T21:02:00

Solution 1

Try using @ or \ escape sequences when you are defining the file name.

Posted 15-May-11 21:02pm

Abhinav S

Comments

tfyuhijk 16-May-11 3:14am

Sorry, i don't really get it....because i'm using visual studio 2010, is it possible for you to give me some reference website? Thanks you so much

Sergey Alexandrovich Kryukov 16-May-11 3:18am

There is no website for this! Look at C# syntax and learn how to write string literals. Look just at the standard or any manual (MSDN, for example).

The problem itself is different. Please see my answer.

Sergey Alexandrovich Kryukov 16-May-11 3:19am

Abhinav, the answer is correct (a 5) but maybe not quite complete.
Please see my answer.
--SA

Abhinav S 16-May-11 3:21am

Thank you SA.

Sergey Alexandrovich Kryukov · Answer 2 · 2011-05-15T21:16:00

Solution 2

A file name hardly can contain ":", "*" or "?". From the client standpoint, this is not a file but URL, so the directory delimiter is "/" (however "\" is also accepted if the URL is a local file). How can this be a problem?

Abhinav correctly explained that you can put any of these characters in a string literal. Is this was a problem? If it was, remember that there is practically no situation when you should use hard-coded string constants in your code, especially it this is a URL.

—SA

Posted 15-May-11 21:16pm

Sergey Alexandrovich Kryukov

Comments

Abhinav S 16-May-11 3:20am

Complete answer. My 5.

Sergey Alexandrovich Kryukov 16-May-11 4:24am

Thank you, Abhinav.
--SA

tfyuhijk 16-May-11 3:24am

client.DownloadFile(item.Link, @"C:\Jobresult - " + item.Title + ".html");

visual studio said An exception occurred during a WebClient request. so i was wondering is it something wrong about the symbols

Sergey Alexandrovich Kryukov 16-May-11 4:28am

Are you sure the exception is in this line? Did you do it under debugger or saw exception stack?
Also, repeating "+" is evil (because string is immutable, performance problem). Correct way it:

string url = string.Format(@"file://C:\Jobresult - {0}.html", item.Title).

But - don't hard-code format string, put it in resource where you can write it verbosely.
Also, pay attention -- I added file:// schema to the URL.
--SA

Kim Togo · Answer 3 · 2011-05-15T21:36:00

Solution 3

Check out Uri.EscapeUriString[^].
Use the EscapeUriString method to prepare an unescaped URI string to be a parameter to the Uri constructor.

Posted 15-May-11 21:36pm

Kim Togo