Validating XML Files Against XSD Schemas in .NET 1.x and 2.0: ASP Alliance

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Validating XML Files Against XSD Schemas in .NET 1.x and 2.0

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Published: 14 Aug 2006

Abstract
Validating XML files is a common task in software development for developers. There are three ways to validate XML files: XSD Schema, DTD and Relax NG. In .NET XSD Schema is the preferred way to validate XML files. In this article I will dicuss both approaches and will give code samples to implement them both.

by Keyvan Nayyeri
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Article Contents:

Introduction

XSD Schema, DTD and Relax NG are three common ways to validate a XML file structure. The first approach, XSD Schema, has been supported by Microsoft .NET Framework and is the best approach for .NET developers. Schema files are a special kind of XML file that define the structure of an XML file via some pre-defined elements and attributes.

Using this Schema file you can validate your XML file to make sure it fits to your application's needs to prevent any exception in your code. There are several free or commercial tools which do this validation for you, but in many cases you need to accomplish this task in your own applications with your code.

Fortunately, .NET has provided all the tools to do this and all you need is to apply these tools. The process to do this is a bit different in .NET 2.0 because a main object for this process in .NET 1.x is obsolete in .NET 2.0.

Here I give you the steps you need to do this in both .NET 1.x and 2.0.

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User Comments

Title: xml
Name: Raghu
Date: 11/14/2008 8:59:05 AM
Comment:
need to validate xml with xsd

Title: Senior Software Consultant
Name: Jeff Huckins
Date: 8/22/2008 11:04:44 AM
Comment:
Just like somebody else that I see posted a message on this article, I have implemented the .NET 2.0 solution and it doesn't find any errors when I inject them. Can somebody tell me what is wrong here? (jhuckins@zaio.com)

Thanks in advance
Jeff

Title: Thanks Sandeep Meravi, Meghna Godhani
Name: dev
Date: 7/7/2008 8:21:56 AM
Comment:
your code has helped me a lot, thanks a lot for this code
:)

Title: AVP
Name: Prem
Date: 6/7/2008 8:59:19 AM
Comment:
Excellent article.

Title: Validate xml with xsd
Name: Virus
Date: 6/3/2008 12:07:38 PM
Comment:
Its too good and working fine.

Title: Validating XML Files Against XSD Schemas in .NET 2.0
Name: Sandeep Meravi, Meghna Godhani
Date: 2/20/2008 2:23:23 AM
Comment:
Here we are posting the most precise code to validate to an XML File using schema .

private void ValidatingXML()
{
try
{
string xmlFile = Server.MapPath("Dvdlist.xml");
string xsdFile = Server.MapPath("DVDList.xsd");

XmlReaderSettings settings = new XmlReaderSettings();
settings.ValidationType = ValidationType.Schema;

settings.Schemas.Add("", xsdFile);

XmlReader objXmlReader = XmlReader.Create(xmlFile, settings);

while (objXmlReader.Read())
{ }
}
catch (XmlSchemaValidationException e)
{
Response.Write(e.Message.ToString());
}

}

Title: How is this called?
Name: Kevin
Date: 2/14/2008 10:41:32 PM
Comment:
Somewhat new, but I placed the *.cs file in, do a using and calling it the way I think it should be called but I keep getting the following error:

Value cannot be null.
Parameter name: schema

Can someone help me out? I'm sure I'm doing something blatantly wrong here.

Title: Developer
Name: Lakshmi
Date: 2/7/2008 5:32:02 AM
Comment:
very nice example and presented in a good way,explaining each and every step
Thank u

Title: how to validate xmlstring or xmlnode in string format
Name: Anki
Date: 12/5/2007 4:51:16 AM
Comment:
can anybody tell me how to validate a single xmlnode against xmlschema or nodes in string format? this example only validates a xmlfile.

Title: Validating XML Files Against XSD Schemas in .NET 1.x and 2.0
Name: john
Date: 8/21/2007 8:11:45 PM
Comment:
I tested the code for .net 2.0, and it did not catch any of the errors i tried including:
1. node names not in the schema
2. node values that were not in an enumerated list in the schema. What does it catch?

Title: Details: Problem with XmlSchema.Read.....please help
Name: Hemendra Vyas
Date: 8/17/2007 7:41:29 AM
Comment:
I thnk some problem came in the last post so pasting it again:

This is a part of code that inserts a sub-node inside a node.If i try for the first time after rebuilding the code this error is received. If i try again, I won't receive this message.

The Inner message is :
Could not find file"StructureLinkage.xsd"

Details
Message:
Failure to ad schema to enable nodal linkage validation-check xsd location.
Could not find file"StructureLinkage.xsd"

If after clicking on "OK" to the current message I again try it, then in the below code then the value of "schema_collection_object" in not null and is of type XMLSchemaCollection.

Please help.

Title: Problem with XmlSchema.Read.....please help
Name: Hemendra Vyas
Date: 8/17/2007 3:29:10 AM
Comment:
Please help out in following code snippet, please reply me at hvyas@irevna.com:

For the first time it gives prompt while XmlSchema.Read(). Second time schema_collection_object is not null and so does not enter into this block of code.

Please help............

private static XmlSchemaCollection schema_collection_object;
private static XmlSchema m_ifschema;
-------
-------
-------

if (schema_collection_object==null)
{
schema_collection_object=new XmlSchemaCollection();

XmlTextReader xmlFile=new XmlTextReader(path);
//path contains the path of the .xsd file

m_ifschema=XmlSchema.Read(xmlFile,new ValidationEventHandler(ValidationCallBack));

//*******error is genarated in the above statement

m_ifSchema.Compile(newValidationEventHandler(Valid ationCallBack));

schema_collection_object.Add(m_ifSchema);
}

Title: XMl Validation
Name: Anil Dudhani
Date: 8/17/2007 1:54:52 AM
Comment:
In some cases this validation is failed..see example send me message...

Title: Excellent Working Example
Name: Rob
Date: 6/14/2007 10:12:18 AM
Comment:
This is the first example I've seen that both works and has a simple interface. Thanks for taking the time to write an excellent article and including a simple class that can be used very easily in other projects.

Title: Developer
Name: sudhakar
Date: 6/7/2007 9:17:36 AM
Comment:
I am working with .Net 2.0. i am providing with the required xml string and xml schema string on which the xml string is to be validated. My code is as follows:

while (objXmlReader.Read())
{}
DataSet objDataSet=new DataSet();
objDataSet.ReadXml(Reader, XmlReadMode.Auto);

I find the data is not loaded into the dataset.. An empty dataset is returned without any exception.It was an urgent issue for me. Please help me in this regards. Thanks in advance

Title: { programmer }
Name: selva
Date: 5/17/2007 9:00:19 AM
Comment:
Nice coding

Title: Developer
Name: John (London)
Date: 4/15/2007 11:38:59 AM
Comment:
Many thanks for taking the time to share this - much appreciated

Title: Developer
Name: Ramesh
Date: 4/12/2007 1:46:39 AM
Comment:
Hi,
Thanks

Title: Developer
Name: Craig
Date: 4/3/2007 6:37:24 AM
Comment:
Thank you for taking the time to write this article.
Is there a method for performing the schema validation without referencing the schema (xsd) file separately?
My XML files all contain lines similar to this:
xsi:noNamespaceSchemaLocation="LocalSchema.xsd"
for local schema's or http references for remote schema's.

Title: Developer
Name: Ysn
Date: 3/28/2007 3:44:10 PM
Comment:
Thanks

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