I've got an XSD schema which I've generated a class for using xsd.exe, and I'm trying to use XmlSerializer.Deserialize to create an instance of that class from an XML file that is supposed to conform to the XSD schema. Unfortunately the XML file has some extra elements that the schema is not expecting, which causes a System.InvalidOperationException to be thrown from Deserialize.
I've tried adding <xs:any> elements to my schema but this doesn't seem to make any difference.
My question is: is there any way to get XmlSerializer.Deserialize to ignore these extra elements?
I usually add extra properties or fields to all entity classes to pick up extra elements and attributes, looking something like the code below:
[XmlAnyAttribute]
public XmlAttribute[] AnyAttributes;
[XmlAnyElement]
public XmlElement[] AnyElements;
Depending on the complexity of your generated code, you may not find hand-inserting this code on every entity appealing. Perhaps only-slightly-less-tedious is defining these attributes in a base class and ensuring all entities inherit the base.
To give fair attribution, I was first introduced to this pattern when reading the source code for DasBlog.
I don't think there is an option to do this. You either have to fix the schema or manually modify the code generated by xsd.exe to allow the XML to be deserialized. You can also try to open the XML document + schema in Visual Studio or any other XML editor with schema support to either fix the schema or the XML document.
Related
I need to convert some XML (it seem that the XML complitated structure) to C# dataset.
So at first I tried to create dataset structure from XSD with:
ds.ReadXml(#"D:\data_RUIAN\ruian\xsd\vymenny_format\VymennyFormatTypy.xsd", XmlReadMode.Auto);
But it´s trowing an arror: DataSet doesn't support 'union' or 'list' as simpleType
Next I try to avoid loading XSD, so I load the source XML file directly:
ds.ReadXml(#"D:\data_RUIAN\data\20130831_OB_577405_UKSH.xml", XmlReadMode.Auto);
But it´s trowing anothe error - Nested table 'Point' which inherits its namespace cannot have multiple parent tables in different namespaces.
Please can you help me solve this?
Tahnks a lot!
Btw: XML is valid, I tried XSD2DB, xsd.exe., svcutil too but with no progress
Conversion to a data set is riddled with limitations. Some may be bypassed through refactoring of the XSD (e.g. by removing the union and simple types). This section on MSDN provides general info re: the inference process.
The answer depends also on how you plan on filling in the data set, and whether you also want to generate XML from the data set that should match some spec. For example, you can choose to ignore the XML namespaces when you infer the set (see DataSet.InferXmlSchema), which may solve the nested table error.
Can we have a required XmlAttribute that does not allow null value?
I want to have something like IsRequired = true in XmlAttribute. Can it be done? I know that there is a 'use="required"' for XmlAttribute, but we can't set its value, can we? Is there any trick to serve this purpose?
I'm still a little confused by what you're trying to do, so i'm assuming that you wish to validate your input xml before attempting to use it in your webservice. In your case your XML needs to have a specific attribute.
To do something like that I typically create an XSD against the XML that should be received and use that to validate it against the XML. The XSD will contain the details that the XML must contain a certain node / attribute. You can use visual studio XSD editor to configure these items.
This topic should help you with the validation code once you're XSD is created:
Validating an XML against referenced XSD in C#
Is it possible to use the XML Schema validation and XMLSerializer together?
My project currently uses XMLSerializer. To validate the schema, we are programatically checking the values like:
if(String.IsNullOrEmpty(person.Name))
throw new Exception();
Thanks!
You can add some additional checking to the xsd, by using the element restriction element. Each type have some facets that you can apply to the type/element - ranging from simple min/max length to regular expressions.
You can even take it one step further and use the appinfo xsd element, where you can add custom specification for etc. validation checking. This step however require you to parse each xml node individually, as the normal Xml Schema Validation don't trigger appinfo functionality.
As a last resort you can even have a look at Schematron, which is a formalized way to add quite complex validation to your xsd, but it is in itself a bit complex, and in many situations overkill.
I would suggest using the XmlValidatingReader for validatiing the schema. Please see http://www.codeproject.com/KB/XML/Serialization.aspx for an example...
Actually you can just provide an XSD within the XML. When you read it using the XMLSerializer, it will throw exceptions if the XML is not matching the XSD.
I'm trying to do something that I can't really find any help on. I have a class, within this class it represents 2 other classes exposed as properties. I want the properties of the classes to sit under the root of the containing class, instead of having the class names and then values:
Example:
public Origin Origin { get; set; }
public Destination Destination { get; set; }
Both these define nodes that should be tagged in the XML as:
<RootClass>
<ValueFromOrigin />
<ValueFromDestination />
</RootClass>
Current, my serialization brings back:
<RootClass>
<Origin>
<ValueFromOrigin />
</Origin>
<Destination>
<ValueFromDestination />
</Destination />
</RootClass>
I have tried adding [XmlElement("RootClass")] to the properties for both Origin and Destination but get an error, assuming that it's trying to duplicate the node for some reason. Has anyone tried this successfully?
Thanks for the help guys.
Eric
You need custom serialization. Without tag information the default serializer wouldn't know how to deserialize all of your data.
Imagine if both those properties were Strings. Which Element goes with which property?
C# Custom Xml Serialization
I think the simplest way if you have xml sample and dont know how to write class, is to use xsd.exe tool to generate classes.
First extract shema using command
xsd.exe your.xml
Second generate
classes from generated schema using
command xsd.exe your.xsd /classes
Its very helpfull when you have big xml schema and dont want to spend many time to write classes for serialization.
I'm probably just doing this wrong, i know.
I'm using custom serialization and when the xml is generated it's putting the class name as the root element
Example:
<MyClassName>
<MyIntendedRootNode>
<ObjectType>
<Property1/>
<Property2/>
...
I'm invoking the serialization by calling xmlserializer.Serialize(writer,Me) so I'm sure that has something to do with it.
I've tried putting XMLRoot onto the class, but I think as vb is compiling this partial class with its aspx page, it's either overwriting this property or ignoring it entirely.
Ideally I'd like to just tell it to either throw away everything it has and use a different root element.
Anybody else do this except me?
Thanks
You can use either IXmlSerializable or use the XML attributes. I use XmlSerializer passing the root in the constructor.
var MemoryStream ms;
var customRoot = dataObject as XmlRootAttribute;
var xml = new XmlSerializer(dataObject.GetType(), customRoot);
xml.Serialize(ms, dataObject);
In ASP.NET, the actual class that is loaded is a generated class that inherits from your class. (It turns out--surprisingly--that this generated code is actually separate from the additional generated code that is combined with your code using the partial class technique. The generated class has the same name as the class you are working on, but it is in a different namespace.) Since XmlRoot is not an inherited attribute, the XmlSerializer does not see it.
I don't think there is any solution (other than modify the document after you have generated it).
Are you trying to serialize a codebehind file?
I would suggest writing a model to contain the data that needs to be saved, and then serializing that instead. Then use the appropriate XMLWriter attributes to make sure your root element is correctly named.
Or you could implement IXmlSerializable and have full control over your Xml but its a bit of extra effort just to change a root element name.
You can create a wrapper class and give that wrapper class with the name that you wish to be shown in the xml root.