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.NET Forum / Languages / C# / October 2007XmlTextWriter, XmlDocument
Hi all, I need to embed an image to an existing xml file. I guess this is possible using XmlTextWriter.WriteBase64() method. My problem is that XmlTextWriter writes to a new document. How can I edit an existing doc (for example with XmlDocument class) and write an image to it? I'm sorry but I'm a bit confused about the difference between XmlTextWriter and XmlTextDocument. Thanks. Hello, Ars! To put it simple with XmlDocument you're working with object model of the XML file, XmlTextWriter is doesn't introduce object model. Working with XmlTextWriter puts more work on you as a developer. IMO with XmlDocument it is far more simple to edit xml documnet. With XmlDocument getting to the necessary node will look like: XmlDocument xmlDoc= new XmlDocument(); xmlDoc.Load(xmlFile); XmlNode toWrite = xmlDoc.SelectSingleNode(xpathToNode); now you can create attributes or create text section. and then save the document xmlDoc.Save(file); Since XmlDocument builds in-memory object model of the XML file it consumes more memory then XmlTextWriter. If you have small xmldocument it is not an issue. -- With best regards, Vadym Stetsiak. Blog: http://vadmyst.blogspot.com You wrote on Wed, 17 Oct 2007 16:16:35 +0200: ACC> Hi all, I need to embed an image to an existing xml file. I guess ACC> this is possible using XmlTextWriter.WriteBase64() method. My ACC> problem is that ACC> XmlTextWriter writes to a new document. ACC> How can I edit an existing doc (for example with XmlDocument class) ACC> and write an image to it? ACC> I'm sorry but I'm a bit confused about the difference between ACC> XmlTextWriter and XmlTextDocument. ACC> Thanks. Ok, perfect. Let's say I use the xmlDoc.AppendChild(xmlDoc.CreateElement(....))...How to put the image in? > Hello, Ars! > [quoted text clipped - 34 lines] > > ACC> Thanks. Hello, Ciri! Using Base64 format you can add that image as a text section to newly created XmlElement object. say, byte[] image; XmlElement xmlImage = xmlDoc.CreateElement("image"); XmlText imageText = xmlDoc.CreateText(Convert.ToBase64String(image)); xmlImage.AppendChild(imageText); xmlDoc.AppendChild(xmlImage); Note, that Convert class also has a method to get back byte array Convert.FromBase64String(...); -- With best regards, Vadym Stetsiak. Blog: http://vadmyst.blogspot.com You wrote on Wed, 17 Oct 2007 16:57:47 +0200: C> Ok, perfect. Let's say I use the C> xmlDoc.AppendChild(xmlDoc.CreateElement(....))...How to put the image C> in? C> "Vadym Stetsiak" <vadmyst@gmail.com> ha scritto nel messaggio C> news:eDKnnqMEIHA.5324@TK2MSFTNGP02.phx.gbl... >> Hello, Ars! >> To put it simple with XmlDocument you're working with object model of >> the >> XML file, XmlTextWriter is doesn't introduce object model. >> Working with XmlTextWriter puts more work on you as a developer. >> IMO with XmlDocument it is far more simple to edit xml documnet. >> With XmlDocument getting to the necessary node will look like: >> XmlDocument xmlDoc= new XmlDocument(); >> xmlDoc.Load(xmlFile); >> XmlNode toWrite = xmlDoc.SelectSingleNode(xpathToNode); >> now you can create attributes or create text section. >> and then save the document xmlDoc.Save(file); >> Since XmlDocument builds in-memory object model of the XML file it >> consumes more memory then XmlTextWriter. >> If you have small xmldocument it is not an issue. >> -- >> With best regards, Vadym Stetsiak. >> Blog: http://vadmyst.blogspot.com >> You wrote on Wed, 17 Oct 2007 16:16:35 +0200: ACC>>> Hi all, I need to embed an image to an existing xml file. I guess ACC>>> this is possible using XmlTextWriter.WriteBase64() method. My ACC>>> problem is that ACC>>> XmlTextWriter writes to a new document. ACC>>> How can I edit an existing doc (for example with XmlDocument ACC>>> class) ACC>>> and write an image to it? ACC>>> I'm sorry but I'm a bit confused about the difference between ACC>>> XmlTextWriter and XmlTextDocument. ACC>>> Thanks. Wow! That's it. Thank you very much. > Hello, Ciri! > [quoted text clipped - 63 lines] > > ACC>>> Thanks. Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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