XmlSchemaCollection.Add Method

Reference

Definition

Namespace:: System.Xml.Schema

Assemblies:: netstandard.dll, System.Xml.ReaderWriter.dll

Assembly:: System.Xml.ReaderWriter.dll

Assembly:: System.Xml.dll

Assembly:: netstandard.dll

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

Adds the given schema into the schema collection.

Overloads

Add(XmlSchema)	Adds the XmlSchema to the collection.
Add(XmlSchemaCollection)	Adds all the namespaces defined in the given collection (including their associated schemas) to this collection.
Add(String, String)	Adds the schema located by the given URL into the schema collection.
Add(String, XmlReader)	Adds the schema contained in the XmlReader to the schema collection.
Add(XmlSchema, XmlResolver)	Adds the XmlSchema to the collection. The specified XmlResolver is used to resolve any external references.
Add(String, XmlReader, XmlResolver)	Adds the schema contained in the XmlReader to the schema collection. The specified XmlResolver is used to resolve any external resources.

Remarks

Important

The XmlSchemaCollection class is obsolete in the .NET Framework version 2.0 and has been replaced by the XmlSchemaSet class.

Add(XmlSchema)

Source:: XmlSchemaCollection.cs

Source:: XmlSchemaCollection.cs

Source:: XmlSchemaCollection.cs

Adds the XmlSchema to the collection.

public:
 System::Xml::Schema::XmlSchema ^ Add(System::Xml::Schema::XmlSchema ^ schema);

public System.Xml.Schema.XmlSchema? Add(System.Xml.Schema.XmlSchema schema);

public System.Xml.Schema.XmlSchema Add(System.Xml.Schema.XmlSchema schema);

member this.Add : System.Xml.Schema.XmlSchema -> System.Xml.Schema.XmlSchema

Public Function Add (schema As XmlSchema) As XmlSchema

Parameters

schema: XmlSchema

The XmlSchema to add to the collection.

Returns

XmlSchema

The XmlSchema object.

Remarks

The targetNamespace attribute is used to identify this schema.

If the schema being added contains references to other namespaces (through include and import elements), the trust level of the application determines how these other namespaces are resolved. (In the .NET Framework version 1.0, a default XmlUrlResolver was always used).

Fully trusted code: A default XmlUrlResolver with no user credentials is used to resolve any external resources. The schemas for these other namespaces are loaded for validation purposes only. Unlike the original schema, these other schemas are not explicitly added to the schema collection. As a result, they are not accessible using any of the collection methods or properties. If these external resources are located on a network resource that requires authentication, use an overload that takes an XmlResolver as one of its arguments and specify an XmlResolver with the necessary credentials.

Semi-trusted code: External references are not resolved.

Note

If the XmlSchemaCollection is being accessed using the XmlValidatingReader.Schemas property, the Add method uses the XmlResolver specified by the XmlValidatingReader.XmlResolver property.

Important

The XmlSchemaCollection class is obsolete in the .NET Framework version 2.0 and has been replaced by the XmlSchemaSet class.

Applies to

.NET 10 and other versions

Product	Versions
.NET	Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9, 10
.NET Framework	1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
.NET Standard	2.0, 2.1

Add(XmlSchemaCollection)

Source:: XmlSchemaCollection.cs

Source:: XmlSchemaCollection.cs

Source:: XmlSchemaCollection.cs

Adds all the namespaces defined in the given collection (including their associated schemas) to this collection.

public:
 void Add(System::Xml::Schema::XmlSchemaCollection ^ schema);

public void Add(System.Xml.Schema.XmlSchemaCollection schema);

member this.Add : System.Xml.Schema.XmlSchemaCollection -> unit

Public Sub Add (schema As XmlSchemaCollection)

Parameters

schema: XmlSchemaCollection

The XmlSchemaCollection you want to add to this collection.

Remarks

If the schema being added contains references to other namespaces (through include and import elements or the x-schema attribute), the trust level of the application determines how these other namespaces are resolved. (In the .NET Framework version 1.0, a default XmlUrlResolver was always used).

Semi-trusted code: External references are not resolved.

Note

If the XmlSchemaCollection is being accessed using the XmlValidatingReader.Schemas property, the Add method uses the XmlResolver specified by the XmlValidatingReader.XmlResolver property.

Important

The XmlSchemaCollection class is obsolete in the .NET Framework version 2.0 and has been replaced by the XmlSchemaSet class.

Applies to

.NET 10 and other versions

Product	Versions
.NET	Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9, 10
.NET Framework	1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
.NET Standard	2.0, 2.1

Add(String, String)

Source:: XmlSchemaCollection.cs

Source:: XmlSchemaCollection.cs

Source:: XmlSchemaCollection.cs

Adds the schema located by the given URL into the schema collection.

public:
 System::Xml::Schema::XmlSchema ^ Add(System::String ^ ns, System::String ^ uri);

public System.Xml.Schema.XmlSchema? Add(string? ns, string uri);

public System.Xml.Schema.XmlSchema Add(string ns, string uri);

member this.Add : string * string -> System.Xml.Schema.XmlSchema

Public Function Add (ns As String, uri As String) As XmlSchema

Parameters

ns: String

The namespace URI associated with the schema. For XML Schemas, this will typically be the targetNamespace.

uri: String

The URL that specifies the schema to load.

Returns

XmlSchema

The XmlSchema added to the schema collection; null if the schema being added is an XDR schema or if there are compilation errors in the schema.

Exceptions

XmlException

The schema is not a valid schema.

Examples

The following example validates three XML files using schemas stored in the XmlSchemaCollection.

#using <System.dll>
#using <System.Xml.dll>

using namespace System;
using namespace System::IO;
using namespace System::Xml;
using namespace System::Xml::Schema;

public ref class SchemaCollectionSample
{
private:
   XmlTextReader^ reader;
   XmlValidatingReader^ vreader;
   Boolean m_success;

public:
   SchemaCollectionSample()
   {
      reader = nullptr;
      vreader = nullptr;
      m_success = true;

      //Load the schema collection.
      XmlSchemaCollection^ xsc = gcnew XmlSchemaCollection;
      String^ schema = "books.xsd";
      String^ schema1 = "schema1.xdr";
      xsc->Add( "urn:bookstore-schema", schema ); //XSD schema
      xsc->Add( "urn:newbooks-schema", schema1 ); //XDR schema
      String^ doc1 = "booksSchema.xml";
      String^ doc2 = "booksSchemaFail.xml";
      String^ doc3 = "newbooks.xml";

      //Validate the files using schemas stored in the collection.
      Validate( doc1, xsc ); //Should pass.
      Validate( doc2, xsc ); //Should fail.   
      Validate( doc3, xsc ); //Should fail. 
   }


private:
   void Validate( String^ filename, XmlSchemaCollection^ xsc )
   {
      m_success = true;
      Console::WriteLine();
      Console::WriteLine( "Validating XML file {0}...", filename );
      reader = gcnew XmlTextReader( filename );

      //Create a validating reader.
      vreader = gcnew XmlValidatingReader( reader );

      //Validate using the schemas stored in the schema collection.
      vreader->Schemas->Add( xsc );

      //Set the validation event handler
      vreader->ValidationEventHandler += gcnew ValidationEventHandler( this, &SchemaCollectionSample::ValidationCallBack );

      //Read and validate the XML data.
      while ( vreader->Read() )
      {}

      Console::WriteLine( "Validation finished. Validation {0}", (m_success == true ? (String^)"successful" : "failed") );
      Console::WriteLine();

      //Close the reader.
      vreader->Close();
   }

   void ValidationCallBack( Object^ /*sender*/, ValidationEventArgs^ args )
   {
      m_success = false;
      Console::Write( "\r\n\tValidation error: {0}", args->Message );
   }

};

int main()
{
   gcnew SchemaCollectionSample;
}

using System;
using System.IO;
using System.Xml;
using System.Xml.Schema;

public class SchemaCollectionSample
{
  private const String doc1 = "booksSchema.xml";
  private const String doc2 = "booksSchemaFail.xml";
  private const String doc3 = "newbooks.xml";
  private const String schema = "books.xsd";
  private const String schema1 = "schema1.xdr";

  private XmlTextReader reader=null;
  private XmlValidatingReader vreader = null;
  private Boolean m_success = true;

  public SchemaCollectionSample ()
  {
    //Load the schema collection.
    XmlSchemaCollection xsc = new XmlSchemaCollection();
    xsc.Add("urn:bookstore-schema", schema);  //XSD schema
    xsc.Add("urn:newbooks-schema", schema1);  //XDR schema

    //Validate the files using schemas stored in the collection.
    Validate(doc1, xsc); //Should pass.
    Validate(doc2, xsc); //Should fail.
    Validate(doc3, xsc); //Should fail.
  }

  public static void Main ()
  {
      SchemaCollectionSample validation = new SchemaCollectionSample();
  }

  private void Validate(String filename, XmlSchemaCollection xsc)
  {

     m_success = true;
     Console.WriteLine();
     Console.WriteLine("Validating XML file {0}...", filename.ToString());
     reader = new XmlTextReader (filename);

     //Create a validating reader.
    vreader = new XmlValidatingReader (reader);

     //Validate using the schemas stored in the schema collection.
     vreader.Schemas.Add(xsc);

     //Set the validation event handler
     vreader.ValidationEventHandler += new ValidationEventHandler (ValidationCallBack);
     //Read and validate the XML data.
     while (vreader.Read()){}
     Console.WriteLine ("Validation finished. Validation {0}", (m_success==true ? "successful" : "failed"));
     Console.WriteLine();

     //Close the reader.
     vreader.Close();
  }

  private void ValidationCallBack (object sender, ValidationEventArgs args)
  {
     m_success = false;

     Console.Write("\r\n\tValidation error: " + args.Message);
  }
}

Option Strict
Option Explicit

Imports System.IO
Imports System.Xml
Imports System.Xml.Schema

Public Class SchemaCollectionSample
    Private doc1 As String = "booksSchema.xml"
    Private doc2 As String = "booksSchemaFail.xml"
    Private doc3 As String = "newbooks.xml"
    Private schema As String = "books.xsd"
    Private schema1 As String = "schema1.xdr"
    
    Private reader As XmlTextReader = Nothing
    Private vreader As XmlValidatingReader = Nothing
    Private m_success As Boolean = True
    
    Public Sub New()

            'Load the schema collection
            Dim xsc As New XmlSchemaCollection()
            xsc.Add("urn:bookstore-schema", schema) 'XSD schema
            xsc.Add("urn:newbooks-schema", schema1) 'XDR schema

            'Validate the files using schemas stored in the collection.
            Validate(doc1, xsc) 'Should pass.
            Validate(doc2, xsc) 'Should fail.   
            Validate(doc3, xsc) 'Should fail. 
        
    End Sub
    
    Public Shared Sub Main()
        Dim validation As New SchemaCollectionSample()
    End Sub
    
    Private Sub Validate(filename As String, xsc As XmlSchemaCollection)
        
            m_success = True
            Console.WriteLine()
            Console.WriteLine("Validating XML file {0}...", filename.ToString())
            reader = New XmlTextReader(filename)
            
            'Create a validating reader.
            vreader = New XmlValidatingReader(reader)
            
            'Use the schemas stored in the schema collection.
            vreader.Schemas.Add(xsc)
            
            'Set the validation event handler.
            AddHandler vreader.ValidationEventHandler, AddressOf ValidationCallBack
            'Read and validate the XML data.
            While vreader.Read()
            End While
            Console.WriteLine("Validation finished. Validation {0}", IIf(m_success, "successful", "failed"))
            Console.WriteLine()

            'Close the reader.
            vreader.Close()

    End Sub
       
    
    Private Sub ValidationCallBack(sender As Object, args As ValidationEventArgs)
        m_success = False
        
        Console.Write((ControlChars.CrLf & ControlChars.Tab & "Validation error: " & args.Message))
    End Sub
End Class

The sample uses the following five input files:

booksSchema.xml

XML


<?xml version='1.0'?>
 <bookstore xmlns="urn:bookstore-schema">
   <book genre="autobiography">
     <title>The Autobiography of Benjamin Franklin</title>
     <author>
       <first-name>Benjamin</first-name>
       <last-name>Franklin</last-name>
     </author>
     <price>8.99</price>
   </book>
   <book genre="novel">
     <title>The Confidence Man</title>
     <author>
       <first-name>Herman</first-name>
       <last-name>Melville</last-name>
     </author>
     <price>11.99</price>
   </book>
 </bookstore>

booksSchemaFail.xml

XML


<?xml version='1.0'?>
 <bookstore xmlns="urn:bookstore-schema">
   <book>
     <author>
       <first-name>Benjamin</first-name>
       <last-name>Franklin</last-name>
     </author>
   </book>
   <book genre="novel">
     <title>The Confidence Man</title>
     <author>
       <first-name>Herman</first-name>
       <last-name>Melville</last-name>
     </author>
     <price>11.99</price>
   </book>
   <book genre="philosophy">
     <title>The Gorgias</title>
     <author>
       <name>Plato</name>
     </author>
     <price>9.99</price>
   </book>
 </bookstore>

newbooks.xml

XML


<?xml version='1.0'?>
<bookstore xmlns="urn:newbooks-schema">
  <book genre="novel" style="hardcover">
    <title>The Handmaid's Tale</title>
    <author>
      <first-name>Margaret</first-name>
      <last-name>Atwood</last-name>
    </author>
    <price>19.95</price>
  </book>
  <book genre="novel" style="other">
    <title>The Poisonwood Bible</title>
    <author>
      <first-name>Barbara</first-name>
      <last-name>Kingsolver</last-name>
    </author>
    <price>11.99</price>
  </book>
</bookstore>

books.xsd

XML


<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
     xmlns="urn:bookstore-schema"
     elementFormDefault="qualified"
     targetNamespace="urn:bookstore-schema">
 
  <xsd:element name="bookstore" type="bookstoreType"/>
 
  <xsd:complexType name="bookstoreType">
   <xsd:sequence maxOccurs="unbounded">
    <xsd:element name="book"  type="bookType"/>
   </xsd:sequence>
  </xsd:complexType>
 
  <xsd:complexType name="bookType">
   <xsd:sequence>
    <xsd:element name="title" type="xsd:string"/>
    <xsd:element name="author" type="authorName"/>
    <xsd:element name="price"  type="xsd:decimal"/>
   </xsd:sequence>
   <xsd:attribute name="genre" type="xsd:string"/>
  </xsd:complexType>
 
  <xsd:complexType name="authorName">
   <xsd:sequence>
    <xsd:element name="first-name"  type="xsd:string"/>
    <xsd:element name="last-name" type="xsd:string"/>
   </xsd:sequence>
  </xsd:complexType>
 
 </xsd:schema>

schema1.xdr

XML


<?xml version="1.0"?>
<Schema xmlns="urn:schemas-microsoft-com:xml-data"
        xmlns:dt="urn:schemas-microsoft-com:datatypes">
  <ElementType name="first-name" content="textOnly"/>
  <ElementType name="last-name" content="textOnly"/>
  <ElementType name="name" content="textOnly"/>
  <ElementType name="price" content="textOnly" dt:type="fixed.14.4"/>
  <ElementType name="author" content="eltOnly" order="one">
    <group order="seq">
      <element type="name"/>
    </group>
    <group order="seq">
      <element type="first-name"/>
      <element type="last-name"/>
    </group>
  </ElementType>
  <ElementType name="title" content="textOnly"/>
  <AttributeType name="genre" dt:type="string"/>
  <AttributeType name="style" dt:type="enumeration"
        dt:values="paperback hardcover"/>
  <ElementType name="book" content="eltOnly">
    <attribute type="genre" required="yes"/>
    <attribute type="style" required="yes"/>
    <element type="title"/>
    <element type="author"/>
    <element type="price"/>
  </ElementType>
  <ElementType name="bookstore" content="eltOnly">
    <element type="book"/>
  </ElementType>
</Schema>

Remarks

If ns has already been associated with another schema in the collection, the schema being added replaces the original schema in the collection. For example, in the following C# code, authors.xsd is removed from the collection and names.xsd is added.

schemaColl.Add("urn:author", "authors.xsd");  
schemaColl.Add("urn:author", "names.xsd");

If ns is null and the schema being added is an XML Schema, the Add method uses the targetNamespace defined in the XML Schema to identify the schema in the collection. If the schema being added contains references to other namespaces (through include and import elements or the x-schema attribute), the trust level of the application determines how these other namespaces are resolved. (In the .NET Framework version 1.0, a default XmlUrlResolver was always used).

Semi-trusted code: External references are not resolved.

Note

If the XmlSchemaCollection is being accessed using the XmlValidatingReader.Schemas property, the Add method uses the XmlResolver specified by the XmlValidatingReader.XmlResolver property.

Important

The XmlSchemaCollection class is obsolete in the .NET Framework version 2.0 and has been replaced by the XmlSchemaSet class.

Applies to

.NET 10 and other versions

Product	Versions
.NET	Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9, 10
.NET Framework	1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
.NET Standard	2.0, 2.1

Add(String, XmlReader)

Source:: XmlSchemaCollection.cs

Source:: XmlSchemaCollection.cs

Source:: XmlSchemaCollection.cs

Adds the schema contained in the XmlReader to the schema collection.

public:
 System::Xml::Schema::XmlSchema ^ Add(System::String ^ ns, System::Xml::XmlReader ^ reader);

public System.Xml.Schema.XmlSchema? Add(string? ns, System.Xml.XmlReader reader);

public System.Xml.Schema.XmlSchema Add(string ns, System.Xml.XmlReader reader);

member this.Add : string * System.Xml.XmlReader -> System.Xml.Schema.XmlSchema

Public Function Add (ns As String, reader As XmlReader) As XmlSchema

Parameters

ns: String

The namespace URI associated with the schema. For XML Schemas, this will typically be the targetNamespace.

reader: XmlReader

XmlReader containing the schema to add.

Returns

XmlSchema

The XmlSchema added to the schema collection; null if the schema being added is an XDR schema or if there are compilation errors in the schema.

Exceptions

XmlException

The schema is not a valid schema.

Remarks

If ns has already been associated with another schema in the collection, the schema being added replaces the original schema in the collection.

If ns is null and the schema being added is an XML Schema, the Add method uses the targetNamespace defined in the XML Schema to identify the schema in the collection.

Semi-trusted code: External references are not resolved.

Note

If the XmlSchemaCollection is being accessed using the XmlValidatingReader.Schemas property, the Add method uses the XmlResolver specified by the XmlValidatingReader.XmlResolver property.

Important

The XmlSchemaCollection class is obsolete in the .NET Framework version 2.0 and has been replaced by the XmlSchemaSet class.

Applies to

.NET 10 and other versions

Product	Versions
.NET	Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9, 10
.NET Framework	1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
.NET Standard	2.0, 2.1

Add(XmlSchema, XmlResolver)

Source:: XmlSchemaCollection.cs

Source:: XmlSchemaCollection.cs

Source:: XmlSchemaCollection.cs

Adds the XmlSchema to the collection. The specified XmlResolver is used to resolve any external references.

public:
 System::Xml::Schema::XmlSchema ^ Add(System::Xml::Schema::XmlSchema ^ schema, System::Xml::XmlResolver ^ resolver);

public System.Xml.Schema.XmlSchema? Add(System.Xml.Schema.XmlSchema schema, System.Xml.XmlResolver? resolver);

public System.Xml.Schema.XmlSchema Add(System.Xml.Schema.XmlSchema schema, System.Xml.XmlResolver resolver);

member this.Add : System.Xml.Schema.XmlSchema * System.Xml.XmlResolver -> System.Xml.Schema.XmlSchema

Public Function Add (schema As XmlSchema, resolver As XmlResolver) As XmlSchema

Parameters

schema: XmlSchema

The XmlSchema to add to the collection.

resolver: XmlResolver

The XmlResolver used to resolve namespaces referenced in include and import elements. If this is null, external references are not resolved.

Returns

XmlSchema

The XmlSchema added to the schema collection.

Exceptions

XmlException

The schema is not a valid schema.

Examples

The following example adds a schema to the collection. An XmlUrlResolver is passed to the Add method which sets the necessary credentials required to access any external resources referenced in the schema.

XmlSchemaCollection^ sc = gcnew XmlSchemaCollection;
sc->ValidationEventHandler += gcnew ValidationEventHandler( Sample::ValidationCallBack );

// Create a resolver with the necessary credentials.
XmlUrlResolver^ resolver = gcnew XmlUrlResolver;
System::Net::NetworkCredential^ nc;
nc = gcnew System::Net::NetworkCredential( UserName,SecurelyStoredPassword,Domain );
resolver->Credentials = nc;

// Add the new schema to the collection.
sc->Add( nullptr, gcnew XmlTextReader( "sample.xsd" ), resolver );

XmlSchemaCollection sc = new XmlSchemaCollection();
sc.ValidationEventHandler += new ValidationEventHandler(ValidationCallBack);

// Create a resolver with the necessary credentials.
XmlUrlResolver resolver = new XmlUrlResolver();
resolver.Credentials = System.Net.CredentialCache.DefaultCredentials;

// Add the new schema to the collection.
sc.Add("", new XmlTextReader("sample.xsd"), resolver);

Dim sc As XmlSchemaCollection = New XmlSchemaCollection()
AddHandler sc.ValidationEventHandler, AddressOf ValidationCallBack

' Create a resolver with the necessary credentials.
Dim resolver As XmlUrlResolver = New XmlUrlResolver()
resolver.Credentials = System.Net.CredentialCache.DefaultCredentials

' Add the new schema to the collection.
sc.Add("", New XmlTextReader("sample.xsd"), resolver)

Remarks

The targetNamespace attribute is used to identify this schema.

If the schema contains include and import elements that reference other namespaces, the schemas for these other namespaces are loaded for validation purposes only. Unlike the original schema, these other schemas are not explicitly added to the schema collection. As a result, they are not accessible using any of the collection methods or properties.

Important

The XmlSchemaCollection class is obsolete in the .NET Framework version 2.0 and has been replaced by the XmlSchemaSet class.

Applies to

.NET 10 and other versions

Product	Versions
.NET	Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9, 10
.NET Framework	1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
.NET Standard	2.0, 2.1

Add(String, XmlReader, XmlResolver)

Source:: XmlSchemaCollection.cs

Source:: XmlSchemaCollection.cs

Source:: XmlSchemaCollection.cs

Adds the schema contained in the XmlReader to the schema collection. The specified XmlResolver is used to resolve any external resources.

public:
 System::Xml::Schema::XmlSchema ^ Add(System::String ^ ns, System::Xml::XmlReader ^ reader, System::Xml::XmlResolver ^ resolver);

public System.Xml.Schema.XmlSchema? Add(string? ns, System.Xml.XmlReader reader, System.Xml.XmlResolver? resolver);

public System.Xml.Schema.XmlSchema Add(string ns, System.Xml.XmlReader reader, System.Xml.XmlResolver resolver);

member this.Add : string * System.Xml.XmlReader * System.Xml.XmlResolver -> System.Xml.Schema.XmlSchema

Public Function Add (ns As String, reader As XmlReader, resolver As XmlResolver) As XmlSchema

Parameters

ns: String

The namespace URI associated with the schema. For XML Schemas, this will typically be the targetNamespace.

reader: XmlReader

XmlReader containing the schema to add.

resolver: XmlResolver

The XmlResolver used to resolve namespaces referenced in include and import elements or x-schema attribute (XDR schemas). If this is null, external references are not resolved.

Returns

XmlSchema

The XmlSchema added to the schema collection; null if the schema being added is an XDR schema or if there are compilation errors in the schema.

Exceptions

XmlException

The schema is not a valid schema.

Remarks

If ns has already been associated with another schema in the collection, the schema being added replaces the original schema in the collection.

If ns is null and the schema being added is an XML Schema, the Add method uses the targetNamespace attribute defined in the XML Schema to identify the schema in the collection.

If the schema being added contains references to other namespaces (through include and import elements or the x-schema attribute), the schemas for these other namespaces are loaded for validation purposes only. Unlike the original schema, these other schemas are not explicitly added to the schema collection. As a result, they are not accessible using any of the collection methods or properties.

Important

The XmlSchemaCollection class is obsolete in the .NET Framework version 2.0 and has been replaced by the XmlSchemaSet class.

Applies to

.NET 10 and other versions

Product	Versions
.NET	Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9, 10
.NET Framework	1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
.NET Standard	2.0, 2.1

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XmlSchemaCollection.Add Method

Definition

Overloads

Remarks

Add(XmlSchema)

Parameters

Returns

Remarks

See also

Applies to

Add(XmlSchemaCollection)

Parameters

Remarks

Applies to

Add(String, String)

Parameters

Returns

Exceptions

Examples

Remarks

Applies to

Add(String, XmlReader)

Parameters

Returns

Exceptions

Remarks

Applies to

Add(XmlSchema, XmlResolver)

Parameters

Returns

Exceptions

Examples

Remarks

See also

Applies to

Add(String, XmlReader, XmlResolver)

Parameters

Returns

Exceptions

Remarks

See also

Applies to

Additional resources