从这个例子中，你可以知道：
1，如何将stream转化为string
2，如何将searializableattribute属性序列化为xml
有metadataobject定义为：
/// <remarks/>
[system.xml.serialization.xmlincludeattribute(typeof(actionparameter))]
[system.xml.serialization.xmlincludeattribute(typeof(action))]
[system.xml.serialization.xmlincludeattribute(typeof(associationgroup))]
[system.xml.serialization.xmlincludeattribute(typeof(typedescriptor))]
[system.xml.serialization.xmlincludeattribute(typeof(parameter))]
[system.xml.serialization.xmlincludeattribute(typeof(filterdescriptor))]
[system.xml.serialization.xmlincludeattribute(typeof(identifier))]
[system.xml.serialization.xmlincludeattribute(typeof(lobsysteminstance))]
[system.xml.serialization.xmlincludeattribute(typeof(individuallysecurablemetadataobject))]
[system.xml.serialization.xmlincludeattribute(typeof(methodinstance))]
[system.xml.serialization.xmlincludeattribute(typeof(association))]
[system.xml.serialization.xmlincludeattribute(typeof(method))]
[system.xml.serialization.xmlincludeattribute(typeof(entity))]
[system.xml.serialization.xmlincludeattribute(typeof(lobsystem))]
[system.xml.serialization.xmlincludeattribute(typeof(model))]
[system.codedom.compiler.generatedcodeattribute("xsd", "2.0.50727.3038")]
[system.serializableattribute()]
[system.diagnostics.debuggerstepthroughattribute()]
[system.componentmodel.designercategoryattribute("code")]
[system.xml.serialization.xmltypeattribute(namespace = "http://schemas.microsoft.com/windows/2007/businessdatacatalog")]
public abstract partial class metadataobject
{
private localizeddisplayname[] localizeddisplaynamesfield;
private property[] propertiesfield;
private string namefield;
private string defaultdisplaynamefield;
private bool iscachedfield;
public metadataobject()
this.iscachedfield = true;
}
[system.xml.serialization.xmlarrayitemattribute(isnullable = false)]
public localizeddisplayname[] localizeddisplaynames
get
return this.localizeddisplaynamesfield;
set
this.localizeddisplaynamesfield = value;
public property[] properties
return this.propertiesfield;
this.propertiesfield = value;
[system.xml.serialization.xmlattributeattribute()]
public string name
return this.namefield;
this.namefield = value;
public string defaultdisplayname
return this.defaultdisplaynamefield;
this.defaultdisplaynamefield = value;
[system.componentmodel.defaultvalueattribute(true)]
public bool iscached
return this.iscachedfield;
this.iscachedfield = value;
下面一个函数将其转化为xml的string：
public static string getxmlfrommodel(metadataobject metadataobject)
memorystream ms = new memorystream();
xmlserializer serializer = new xmlserializer(metadataobject.gettype());
serializer.serialize(ms, metadataobject);
return system.text.asciiencoding.ascii.getstring(ms.toarray(), 0, ms.toarray().length);