Proper Use of Streams

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Fred Chateau - 08 Jan 2008 10:10 GMT

I need to send the following XML to a network connection and at the same
time, output it as a string to an ASPX page. How can I do this?

The network connection code works. If I try to read hmnStream, I get a
"Cannot Read Stream" exception.

HttpWebRequest hmnRequest = (HttpWebRequest)WebRequest.Create(wctXmlServer);
using (Stream hmnStream = hmnRequest.GetRequestStream())
{
XmlTextWriter writer = new XmlTextWriter(hmnStream, Encoding.ASCII);
writer.WriteStartElement("methodCall");
writer.WriteElementString("methodName", "GetLogoFromLocationID");
writer.WriteStartElement("params");
writer.WriteStartElement("param");
writer.WriteElementString("locationID", txtLocationID.Text.Trim());
writer.WriteEndElement();
writer.WriteEndElement();
writer.WriteEndElement();
writer.Close();

StreamReader reqStream = new StreamReader(hmnStream); // Cannot Read
Stream Exception
string output = reqStream.ReadToEnd();
Response.Write(output);
}
ProcessRequest(hmnRequest);

Signature

Regards,

Fred Chateau
fchateauAtComcastDotNet

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Jon Skeet [C# MVP] - 08 Jan 2008 10:16 GMT

> I need to send the following XML to a network connection and at the same
> time, output it as a string to an ASPX page. How can I do this?

GetRequestStream returns a stream into which you can *write* the data
you want as part of the *request*. It sounds to me like you actually
want the response, not the request.

Jon

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Jon Skeet [C# MVP] - 08 Jan 2008 10:18 GMT

> I need to send the following XML to a network connection and at the same
> time, output it as a string to an ASPX page. How can I do this?

<snip>

Sorry, having reread the question:

1) Create an XmlDocument instead of an XmlWriter
2) Write the document to both the request stream and the ASP.NET page

Jon

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Steven Cheng[MSFT] - 09 Jan 2008 02:57 GMT

Thanks for Jon's input.

Hi Fred,

As Jon suggested, you can use XmlDocument to construct the XML content so
as to reuse it for both network sending and ASPX rendering.

Also, if you want to reuse data in stream, I suggested you use the
"MemoryStream" class which can be randomly accessed and keep a copy of data
in memory. You can direcctly read/write data in bytes or wrapper it with
StreamReader/StreamWriter ....

#MemoryStream Class
http://msdn2.microsoft.com/en-us/library/system.io.memorystream(VS.71).aspx

Sincerely,

Steven Cheng

Microsoft MSDN Online Support Lead

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--------------------

>From: "Jon Skeet [C# MVP]" <skeet@pobox.com>
>Newsgroups: microsoft.public.dotnet.languages.csharp
[quoted text clipped - 12 lines]
>
>Jon

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Fred Chateau - 10 Jan 2008 09:55 GMT

Thanks for your help with this.

Signature

Regards,

Fred Chateau
fchateauAtComcastDotNet

> Thanks for Jon's input.
>
[quoted text clipped - 58 lines]
>>
>>Jon

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Proper Use of Streams

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