Note: This API is now obsolete.
Gets or sets a value indicating whether to prohibit document type definition (DTD) processing. This property is obsolete. Use DtdProcessing instead.
(in System.Xml.dll)
Visual Basic (Declaration)
<ObsoleteAttribute("Use XmlReaderSettings.DtdProcessing property instead.")> _
Public Property ProhibitDtd As Boolean
Get
Set
Dim instance As XmlReaderSettings
Dim value As Boolean
value = instance.ProhibitDtd
instance.ProhibitDtd = value
[ObsoleteAttribute("Use XmlReaderSettings.DtdProcessing property instead.")]
public bool ProhibitDtd { get; set; }
[ObsoleteAttribute(L"Use XmlReaderSettings.DtdProcessing property instead.")]
public:
property bool ProhibitDtd {
bool get ();
void set (bool value);
}
[<ObsoleteAttribute("Use XmlReaderSettings.DtdProcessing property instead.")>]
member ProhibitDtd : bool with get, set
Property Value
Type:
System..::.Boolean
true to prohibit DTD processing; otherwise false. The default is true.
When set to true, the XmlReader throws an XmlException when any DTD content is encountered. Do not enable DTD processing if you are concerned about Denial of Service issues or if you are dealing with untrusted sources.
If you have DTD processing enabled, you can use the XmlSecureResolver to restrict the resources that the XmlReader can access. You can also design your application so that the XML processing is memory and time constrained. For example, configure time-out limits in your ASP.NET application.
The following example validates data using a DTD.
Imports System
Imports System.Xml
Imports System.Xml.Schema
Imports System.IO
public class Sample
public shared sub Main()
' Set the validation settings.
Dim settings as XmlReaderSettings = new XmlReaderSettings()
settings.DtdProcessing = DtdProcessing.Parse
settings.ValidationType = ValidationType.DTD
AddHandler settings.ValidationEventHandler, AddressOf ValidationCallBack
' Create the XmlReader object.
Dim reader as XmlReader = XmlReader.Create("itemDTD.xml", settings)
' Parse the file.
while reader.Read()
end while
end sub
' Display any validation errors.
private shared sub ValidationCallBack(sender as object, e as ValidationEventArgs)
Console.WriteLine("Validation Error: {0}", e.Message)
end sub
end class
using System;
using System.Xml;
using System.Xml.Schema;
using System.IO;
public class Sample {
public static void Main() {
// Set the validation settings.
XmlReaderSettings settings = new XmlReaderSettings();
settings.DtdProcessing = DtdProcessing.Parse;
settings.ValidationType = ValidationType.DTD;
settings.ValidationEventHandler += new ValidationEventHandler (ValidationCallBack);
// Create the XmlReader object.
XmlReader reader = XmlReader.Create("itemDTD.xml", settings);
// Parse the file.
while (reader.Read());
}
// Display any validation errors.
private static void ValidationCallBack(object sender, ValidationEventArgs e) {
Console.WriteLine("Validation Error: {0}", e.Message);
}
}
#using <System.Xml.dll>
using namespace System;
using namespace System::Xml;
using namespace System::Xml::Schema;
using namespace System::IO;
// Display any validation errors.
static void ValidationCallBack( Object^ /*sender*/, ValidationEventArgs^ e )
{
Console::WriteLine( L"Validation Error: {0}", e->Message );
}
int main()
{
// Set the validation settings.
XmlReaderSettings^ settings = gcnew XmlReaderSettings;
settings->DtdProcessing = DtdProcessing.Parse;
settings->ValidationType = ValidationType::DTD;
settings->ValidationEventHandler += gcnew ValidationEventHandler( ValidationCallBack );
// Create the XmlReader object.
XmlReader^ reader = XmlReader::Create( L"itemDTD.xml", settings );
// Parse the file.
while ( reader->Read() )
;
return 1;
}
The example uses the itemDTD.xml file as input.
<!--XML file using a DTD-->
<!DOCTYPE store [
<!ELEMENT store (item)*>
<!ELEMENT item (name,dept,price)>
<!ATTLIST item type CDATA #REQUIRED>
<!ELEMENT name (#PCDATA)>
<!ELEMENT price (#PCDATA)>]>
<store>
<item type="supplies" ISBN="2-3631-4">
<name>paint</name>
<price>16.95</price>
</item>
</store>
Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
.NET Framework
Supported in: 3.5, 3.0, 2.0
Obsolete (compiler warning) in 4
.NET Framework Client Profile
Obsolete (compiler warning) in 4
Reference
Other Resources