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POObject reference problem when reaching the end of a XML string
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  1. POObject reference problem when reaching the end of a XML string
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    copied!<p>I've been developing a small xml parser for a specific file with this data structure :</p> <pre><code>&lt;questionnaire type="Echo"&gt; &lt;quest etat="0" ord="0"&gt; &lt;intro&gt; &lt;t&gt;bla bla bla&lt;/t&gt; &lt;/intro&gt; &lt;rep1&gt; &lt;t&gt;word&lt;/t&gt; &lt;ev id="Q0R1"/&gt; &lt;/rep1&gt; &lt;rep2&gt; &lt;t&gt;word&lt;/t&gt; &lt;ev id="Q0R2"/&gt; &lt;/rep2&gt; &lt;/quest&gt; &lt;/questionnaire&gt; </code></pre> <p>The <code>&lt;quest&gt;&lt;/quest&gt;</code> tag is repeated 70 times in fact.</p> <p>Here is the parser I developed in C# and which takes the parameter "xmlString" containing the XML to parse :</p> <pre><code>XmlTextReader reader = new XmlTextReader(new System.IO.StringReader(xmlString)); while(reader.ReadToFollowing("quest")) { Console.WriteLine("================================="); Console.WriteLine("ID : " + reader.GetAttribute("ord").ToString()); reader.ReadToFollowing("intro"); reader.ReadToFollowing("t"); Console.WriteLine("TEXTE : " + reader.ReadString()); reader.ReadToFollowing("rep1"); reader.ReadToFollowing("t"); Console.WriteLine("REPONSE1 : " + reader.ReadString()); reader.ReadToFollowing("ev"); Console.WriteLine("CLE1 : " + reader.GetAttribute("id").ToString()); reader.ReadToFollowing("rep2"); reader.ReadToFollowing("t"); Console.WriteLine("REPONSE2 : " + reader.ReadString()); reader.ReadToFollowing("ev"); Console.WriteLine("CLE2 : " + reader.GetAttribute("id").ToString()); Console.WriteLine("ETAT : False"); } </code></pre> <p>Everything is ok through the 69 first &lt; quest >, but when reaching the 70th, it the fields TEXTE and REPONSE1 are empty and it goes through a NullReferenceException at the line :</p> <pre><code>Console.WriteLine("CLE1 : " + reader.GetAttribute("id").ToString()); </code></pre> <p>Can anybody tell me what's wrong ?? Thanks in advance.</p>
 

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