"There is an error in XML document (0, 0)." error while XML Deserialization

Question

Hi

I am trying experimenting with XML serialization and deserialization using XSD.exe to generate the classes for me from my XML schema. The schema is pretty straight forward and is as follows

<?xml version="1.0" encoding="utf-8" ?>
<xsd: schema xmlns: xsd="http://www.w3.org/2001/XMLSchema"
            targetNamespace ="http://tryingXML.prasad.org/exampel2"
            xmlns:tns="http://tryingXML.prasad.org/exampel2">

  <xsd:element name="Properties" type ="tns: PropertyType"/>

  <xsd: complexType name ="PropertyType" >
    <xsd: sequence>
      <xsd: element name ="KeyValuePair" nillable ="false" type ="tns: KeyValue"/>
      <xsd: element name ="ArrayOfElements" type ="tns: ArrayType" />
    </xsd: sequence>
  </xsd:    complexType>

  <xsd: complexType name ="KeyValue">
    <xsd: sequence>
      <xsd: element name="Key" type ="xsd: string"/>
      <xsd: element name="Value" type ="xsd: string"/>
    </xsd: sequence>
  </xsd:  complexType>

  <xsd: complexType name ="ArrayType">
    <xsd: sequence minOccurs ="0" maxOccurs ="unbounded">
      <xsd: element name ="ArrayElement" type ="tns: ElementType"/>
    </xsd: sequence>
  </xsd: complexType>

  <xsd: complexType name ="ElementType">
    <xsd: sequence>
      <xsd: element name ="serverName" type ="xsd: string"/>
      <xsd: element name ="Instance" type ="xsd: string" />
      <xsd: element name ="IntegratedAuth" type ="xsd: string"/>
    </xsd: sequence>
  </xsd: complexType>
</xsd: schema>

I wrote following code to serialize / deserialize XML data for above schema. Following is the sample code.

            XmlSerializer serialize = new XmlSerializer(typeof(PropertyType), "http://tryingXML.prasad.org/exampel2");
            PropertyType property = new PropertyType();
            property.KeyValuePair = new KeyValue();
            property.KeyValuePair.Key = "Test";
            property.KeyValuePair.Value = "TestValue";

            ElementType[] arrElems = new ElementType[] { new ElementType { Instance ="TestServer", IntegratedAuth ="SSPI", serverName ="TST"}
            };
            property.ArrayOfElements = new ArrayType();
            property.ArrayOfElements.ArrayElement = arrElems;

            FileStream stream = new FileStream("Output.xml",FileMode.Create);
            serialize.Serialize(stream, property);
       

            PropertyType ptype = (PropertyType)serialize.Deserialize(stream);

It serializes the values I am specifying to the XML file, but when I try to deseriaize the same file I get an error
"There is an error in XML document (0, 0)." with an inner exception of "Root Element is missing".

Let me know if I need to do anything else for this.

Thanks
Prasad

Answer 1

After you have written to the stream it is positioned at the end, after the XML you have written. If you then try to read from that same stream there is no root element to be found. So you need to reposition the stream (stream.Position = 0) if the stream supports that or you need to close the stream once you have wriiten to it and open a new one for reading.

 

Answer 2

Thanks Martin It worked

Answer 3

 

This is very helpful. Thanks.

Answer 4

It was simple, but anyway it did do the trick....

Thanks

Answer 5

Really it is very helpful. Thanks..

Answer 6

it worked ! Thanks

Answer 7

Thanks Martin, very helpful tip.

Answer 8

After you have written to the stream it is positioned at the end, after the XML you have written. If you then try to read from that same stream there is no root element to be found. So you need to reposition the stream (stream.Position = 0) if the stream supports that or you need to close the stream once you have wriiten to it and open a new one for reading.

 

Thanks for your help! I encountered the same problem.

Answer 9

Thank You v much Martin Honnen Stream.Position = 0 is the solution to this scary problem