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XmlSchemaElement Class

Definition

Represents the element element from XML Schema as specified by the World Wide Web Consortium (W3C). This class is the base class for all particle types and is used to describe an element in an XML document.

public class XmlSchemaElement : System.Xml.Schema.XmlSchemaParticle
Inheritance

Examples

The following example creates the element element.

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

class XMLSchemaExamples
{
    public static void Main()
    {

        XmlSchema schema = new XmlSchema();

        // <xs:element name="cat" type="string"/>
        XmlSchemaElement elementCat = new XmlSchemaElement();
        schema.Items.Add(elementCat);
        elementCat.Name = "cat";
        elementCat.SchemaTypeName = new XmlQualifiedName("string", "http://www.w3.org/2001/XMLSchema");

        // <xs:element name="dog" type="string"/>
        XmlSchemaElement elementDog = new XmlSchemaElement();
        schema.Items.Add(elementDog);
        elementDog.Name = "dog";
        elementDog.SchemaTypeName = new XmlQualifiedName("string", "http://www.w3.org/2001/XMLSchema");

        // <xs:element name="redDog" substitutionGroup="dog" />
        XmlSchemaElement elementRedDog = new XmlSchemaElement();
        schema.Items.Add(elementRedDog);
        elementRedDog.Name = "redDog";
        elementRedDog.SubstitutionGroup = new XmlQualifiedName("dog");

        // <xs:element name="brownDog" substitutionGroup ="dog" />
        XmlSchemaElement elementBrownDog = new XmlSchemaElement();
        schema.Items.Add(elementBrownDog);
        elementBrownDog.Name = "brownDog";
        elementBrownDog.SubstitutionGroup = new XmlQualifiedName("dog");

        // <xs:element name="pets">
        XmlSchemaElement elementPets = new XmlSchemaElement();
        schema.Items.Add(elementPets);
        elementPets.Name = "pets";

        // <xs:complexType>
        XmlSchemaComplexType complexType = new XmlSchemaComplexType();
        elementPets.SchemaType = complexType;

        // <xs:choice minOccurs="0" maxOccurs="unbounded">
        XmlSchemaChoice choice = new XmlSchemaChoice();
        complexType.Particle = choice;
        choice.MinOccurs = 0;
        choice.MaxOccursString = "unbounded";

        // <xs:element ref="cat"/>
        XmlSchemaElement catRef = new XmlSchemaElement();
        choice.Items.Add(catRef);
        catRef.RefName = new XmlQualifiedName("cat");

        // <xs:element ref="dog"/>
        XmlSchemaElement dogRef = new XmlSchemaElement();
        choice.Items.Add(dogRef);
        dogRef.RefName = new XmlQualifiedName("dog");

        XmlSchemaSet schemaSet = new XmlSchemaSet();
        schemaSet.ValidationEventHandler += new ValidationEventHandler(ValidationCallbackOne);
        schemaSet.Add(schema);
        schemaSet.Compile();

        XmlSchema compiledSchema = null;

        foreach (XmlSchema schema1 in schemaSet.Schemas())
        {
            compiledSchema = schema1;
        }

        XmlNamespaceManager nsmgr = new XmlNamespaceManager(new NameTable());
        nsmgr.AddNamespace("xs", "http://www.w3.org/2001/XMLSchema");
        compiledSchema.Write(Console.Out, nsmgr);
    }

    public static void ValidationCallbackOne(object sender, ValidationEventArgs args)
    {
        Console.WriteLine(args.Message);
    }
}

The following XML file is used for the preceding code example.

<?xml version="1.0" encoding="IBM437"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
    <xs:element name="cat" type="xs:string"/>
    <xs:element name="dog" type="xs:string"/>
    <xs:element name="redDog" substitutionGroup="dog" />
    <xs:element name="brownDog" substitutionGroup ="dog" />

    <xs:element name="pets">
      <xs:complexType>
        <xs:choice minOccurs="0" maxOccurs="unbounded">
          <xs:element ref="cat"/>
          <xs:element ref="dog"/>
        </xs:choice>
      </xs:complexType>
    </xs:element>
</xs:schema>

Remarks

חשוב

  • Do not use schemas from unknown or untrusted sources or locations. Doing so will compromise the security of your code.
  • XML schemas (including inline schemas) are inherently vulnerable to denial of service attacks; do not accept them in untrusted scenarios.
  • Schema validation error messages and exceptions may expose sensitive information about the content model or URI paths to the schema file. Be careful not to expose this information to untrusted callers.

Constructors

XmlSchemaElement()

Initializes a new instance of the XmlSchemaElement class.

Properties

Annotation

Gets or sets the annotation property.

(Inherited from XmlSchemaAnnotated)
Block

Gets or sets a Block derivation.

BlockResolved

Gets the post-compilation value of the Block property.

Constraints

Gets the collection of constraints on the element.

DefaultValue

Gets or sets the default value of the element if its content is a simple type or content of the element is textOnly.

ElementSchemaType

Gets an XmlSchemaType object representing the type of the element based on the SchemaType or SchemaTypeName values of the element.

ElementType
Obsolete.
Obsolete.
Obsolete.

Gets a common language runtime (CLR) object based on the XmlSchemaElement or XmlSchemaElement of the element, which holds the post-compilation value of the ElementType property.

Final

Gets or sets the Final property to indicate that no further derivations are allowed.

FinalResolved

Gets the post-compilation value of the Final property.

FixedValue

Gets or sets the fixed value.

Form

Gets or sets the form for the element.

Id

Gets or sets the string id.

(Inherited from XmlSchemaAnnotated)
IsAbstract

Gets or sets information to indicate if the element can be used in an instance document.

IsNillable

Gets or sets information that indicates if xsi:nil can occur in the instance data. Indicates if an explicit nil value can be assigned to the element.

LineNumber

Gets or sets the line number in the file to which the schema element refers.

(Inherited from XmlSchemaObject)
LinePosition

Gets or sets the line position in the file to which the schema element refers.

(Inherited from XmlSchemaObject)
MaxOccurs

Gets or sets the maximum number of times the particle can occur.

(Inherited from XmlSchemaParticle)
MaxOccursString

Gets or sets the number as a string value. Maximum number of times the particle can occur.

(Inherited from XmlSchemaParticle)
MinOccurs

Gets or sets the minimum number of times the particle can occur.

(Inherited from XmlSchemaParticle)
MinOccursString

Gets or sets the number as a string value. The minimum number of times the particle can occur.

(Inherited from XmlSchemaParticle)
Name

Gets or sets the name of the element.

Namespaces

Gets or sets the XmlSerializerNamespaces to use with this schema object.

(Inherited from XmlSchemaObject)
Parent

Gets or sets the parent of this XmlSchemaObject.

(Inherited from XmlSchemaObject)
QualifiedName

Gets the actual qualified name for the given element.

RefName

Gets or sets the reference name of an element declared in this schema (or another schema indicated by the specified namespace).

SchemaType

Gets or sets the type of the element. This can either be a complex type or a simple type.

SchemaTypeName

Gets or sets the name of a built-in data type defined in this schema or another schema indicated by the specified namespace.

SourceUri

Gets or sets the source location for the file that loaded the schema.

(Inherited from XmlSchemaObject)
SubstitutionGroup

Gets or sets the name of an element that is being substituted by this element.

UnhandledAttributes

Gets or sets the qualified attributes that do not belong to the current schema's target namespace.

(Inherited from XmlSchemaAnnotated)

Methods

Equals(Object)

Determines whether the specified object is equal to the current object.

(Inherited from Object)
GetHashCode()

Serves as the default hash function.

(Inherited from Object)
GetType()

Gets the Type of the current instance.

(Inherited from Object)
MemberwiseClone()

Creates a shallow copy of the current Object.

(Inherited from Object)
ToString()

Returns a string that represents the current object.

(Inherited from Object)

Applies to

מוצר גירסאות
.NET Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9
.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