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copied!<p>Looks like primarily <code>InvalidOperationException</code>.</p> <p>If you go through the documentation for each of the overloads, it will give you more details. For example, see <a href="http://msdn.microsoft.com/en-us/library/tz8csy73.aspx" rel="noreferrer"><code>XmlSerializer.Deserialize Method (XmlReader)</code></a></p> <p>The <code>InvalidOperationException</code> will contain more details about the specific error in its <code>InnerException</code> property.</p> <p>Edit:</p> <p>The <a href="http://msdn.microsoft.com/en-us/library/xc221bxx.aspx" rel="noreferrer"><code>XmlSerializer.Deserialize Method (XmlSerializationReader)</code></a> can throw a <code>NotImplementedException</code>, but it is an internal API and is not meant to be used by your code, so don't worry about it.</p> <p>Edit 2:</p> <p>This code:</p> <pre><code>var ms = new System.IO.MemoryStream(); var deser = new System.Xml.Serialization.XmlSerializer(typeof(string)); deser.Deserialize(ms); </code></pre> <p>throws:</p> <pre><code>System.InvalidOperationException: There is an error in XML document (0, 0). --- System.Xml.XmlException: Root element is missing. at System.Xml.XmlTextReaderImpl.Throw(Exception e) ... <snip> ... </code></pre> <p>So it really looks like the framework will always throw an <code>InvalidOperationException</code>.</p> <p>Really, unless you're worried about mistakenly catching exceptions like <code>ThreadAbortException</code>, you are probably safest catching <em>all</em> exceptions...</p> <p>Edit 3:</p> <p>Using <a href="http://www.red-gate.com/products/reflector/" rel="noreferrer">Reflector</a>: The <code>Deserialize(stream)</code> method reads the stream using an <code>XmlTextReader</code> and calls the <a href="http://msdn.microsoft.com/en-us/library/dk9cbaf1.aspx" rel="noreferrer"><code>XmlSerializer.Deserialize Method (XmlReader, String)</code></a>. That method throws an <code>InvalidOperationException</code> on error (according to the docs).</p> <p>Edit 4:</p> <p><code>Deserialize(stream)</code> can also throw a <code>NullReferenceException</code> if <code>stream</code> is null, because it calls the <a href="http://msdn.microsoft.com/en-us/library/cssfs8c4.aspx" rel="noreferrer"><code>XmlTextReader(Stream)</code></a> constructor.</p>

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