SignedXml.XmlDsigXPathTransformUrl フィールドとは何？わかりやすく解説 Weblio辞書

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.NET Framework クラスライブラリリファレンス

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SignedXml.XmlDsigXPathTransformUrl フィールド

メモ : このフィールドは、.NET Framework version 2.0 で新しく追加されたものです。

XML Path Language (XPath) の URI (Uniform Resource Identifier) を表します。このフィールドは定数です。

名前空間: System.Security.Cryptography.Xml
アセンブリ: System.Security (system.security.dll 内)
構文

Visual Basic (宣言)

Public Const XmlDsigXPathTransformUrl As
 String

Visual Basic (使用法)

Dim value As String

value = SignedXml.XmlDsigXPathTransformUrl

public const string XmlDsigXPathTransformUrl

C++

public:
literal String^ XmlDsigXPathTransformUrl

public static final String XmlDsigXPathTransformUrl

JScript

public const var XmlDsigXPathTransformUrl
 : String

解説

XmlDsigXPathTransformUrl フィールドの値は "http://www.w3.org/TR/1999/REC-xpath-19991116" です。

XMLDSIG 用の要素のいずれかの URI 属性に対し効率よく値を提供するには、このフィールドを使用します。

XmlDsigXPathTransform クラスは、XmlDsigXPathTransformUrl フィールドで定義された変換を実装します。

詳細については、http://www.w3.org/TR/1999/REC-xpath-19991116 の「W3C (World Wide Web Consortium) 仕様」を参照してください。

使用例

XmlDsigXPathTransform クラスのメンバを呼び出す方法を次のコード例に示します。

Visual Basic

Imports System
Imports System.IO
Imports System.Xml
Imports System.Security.Cryptography
Imports System.Security.Cryptography.Xml



Class Class1

    <STAThread()> _
    Shared Sub Main(ByVal
 args() As String)
        ' Encrypt a sample XML string.
        Dim productsXml As XmlDocument = LoadProducts()
        ShowTransformProperties(productsXml)

        ' Encrypt an XPath Xml string.
        Dim transformXml As XmlDocument = LoadTransformByXml()
        ShowTransformProperties(transformXml)

        ' Use XmlDsigXPathTransform to resolve a Uri.
        Dim baseUri As New
 Uri("http://www.contoso.com")
        Dim relativeUri As String
 = "xml"
        Dim absoluteUri As Uri = ResolveUris(baseUri,
 relativeUri)

        Console.WriteLine("This sample completed successfully;
 " + "press Enter to exit.")
        Console.ReadLine()

    End Sub 'Main


    ' Encrypt the text in the specified XmlDocument.
    Private Shared Sub ShowTransformProperties(ByVal
 xmlDoc As XmlDocument)
        ' Create a new XMLDocument object.
        Dim doc As New XmlDocument()

        ' Create a new XmlElement.
        Dim xPathElem As XmlElement = doc.CreateElement("XPath")

        ' Set the element text to the value
        ' of the XPath string.
        xPathElem.InnerText = "ancestor-or-self::PRODUCTS"

        ' Create a new XmlDsigXPathTransform object.
        Dim xmlTransform As New
 XmlDsigXPathTransform()

        ' Load the XPath XML from the element. 
        xmlTransform.LoadInnerXml(xPathElem.SelectNodes("."))
        ' Ensure the transform is using the proper algorithm.
        xmlTransform.Algorithm = SignedXml.XmlDsigXPathTransformUrl
        ' Retrieve the XML representation of the current transform.
        Dim xmlInTransform As XmlElement =
 xmlTransform.GetXml()
        Console.WriteLine(vbLf + "Xml representation of the current
 transform: ")
        Console.WriteLine(xmlInTransform.OuterXml)

        ' Retrieve the valid input types for the current transform.
        Dim validInTypes As Type() = xmlTransform.InputTypes
        ' Verify the xmlTransform can accept the XMLDocument as an
        ' input type.
        Dim i As Integer
        For i = 0 To validInTypes.Length
            If validInTypes(i).Equals(xmlDoc.GetType()) Then
                ' Load the document into the transfrom.
                xmlTransform.LoadInput(xmlDoc)
                Try
                    ' This transform is created for demonstration purposes.
                    Dim secondTransform As
 New XmlDsigXPathTransform()

                    Dim classDescription As
 String = secondTransform.ToString()
                    xmlTransform.LoadInnerXml(xPathElem.SelectNodes("."))
                Catch
                    Console.WriteLine("Caught exception while
 trying to " + "load the specified Xml document.
 The document " + "requires an XPath element to be valid.")
                End Try
                Exit For
            End If
        Next i

        Dim validOutTypes As Type() = xmlTransform.OutputTypes
        For i = validOutTypes.Length - 1 To
 0 Step -1
            If validOutTypes(i).Equals(GetType(System.Xml.XmlDocument))
 Then
                Try
                    Dim xmlDocumentType As
 Type = GetType(System.Xml.XmlDocument)
                    Dim xmlDocumentOutput As
 XmlDocument = CType(xmlTransform.GetOutput(xmlDocumentType), XmlDocument)
                    ' Display to the console the Xml before and after
                    ' encryption.
                    Console.WriteLine("Result of the GetOutput
 method call" + " from the current transform: "
 + xmlDocumentOutput.OuterXml)
                Catch ex As Exception
                    Console.WriteLine("Unexpected exception caught:
 " + ex.ToString())
                End Try

                Exit For
            ElseIf validOutTypes(i).Equals(GetType(System.Xml.XmlNodeList))
 Then
                Try
                    Dim xmlNodeListType As
 Type = GetType(System.Xml.XmlNodeList)
                    Dim xmlNodes As XmlNodeList
 = CType(xmlTransform.GetOutput(xmlNodeListType), XmlNodeList)

                    ' Display to the console the Xml before and after
                    ' encryption.
                    Console.WriteLine("Encoding the following
 message: " + xmlDoc.InnerText)

                    Console.WriteLine("Nodes of the XmlNodeList
 retrieved " + "from GetOutput:")
                    Dim j As Integer
                    For j = 0 To xmlNodes.Count
                        Console.WriteLine("Node "
 + j + " has the following name: " + xmlNodes.Item(j).Name
 + " and the following InnerXml: " + xmlNodes.Item(j).InnerXml)
                    Next j
                Catch ex As Exception
                    Console.WriteLine("Unexpected exception caught:
 " + ex.ToString())
                End Try

                Exit For
            Else
                Dim outputObject As Object
 = xmlTransform.GetOutput()
        Next i

    End Sub 'ShowTransformProperties


    ' Create an XML document for the dsig namespace.
    Private Shared Function
 LoadTransformByXml() As XmlDocument
        Dim xmlDoc As New
 XmlDocument()

        Dim transformXml As String
 = "<Signature><Reference URI=''><Transforms>"
        transformXml += "<Transform><XPath "
        transformXml += "xmlns:dsig='http://www.w3.org/2000/09/xmldsig#'>"
        transformXml += "not(ancestor-or-self::dsig:Signature)"
        transformXml += "</XPath></Transform>"
        transformXml += "</Transforms></Reference></Signature>"

        xmlDoc.LoadXml(transformXml)
        Return xmlDoc

    End Function 'LoadTransformByXml


    ' Create an XML document describing various products.
    Private Shared Function
 LoadProducts() As XmlDocument
        Dim xmlDoc As New
 XmlDocument()

        Dim contosoProducts As String
 = "<PRODUCTS>"
        contosoProducts += "<PRODUCT><ID>123</ID>"
        contosoProducts += "<DESCRIPTION>Router</DESCRIPTION></PRODUCT>"
        contosoProducts += "<PRODUCT><ID>456</ID>"
        contosoProducts += "<DESCRIPTION>Keyboard</DESCRIPTION></PRODUCT>"
        contosoProducts += "<PRODUCT><ID>789</ID>"
        contosoProducts += "<DESCRIPTION>Monitor</DESCRIPTION></PRODUCT>"
        contosoProducts += "</PRODUCTS>"

        xmlDoc.LoadXml(contosoProducts)
        Return xmlDoc

    End Function 'LoadProducts


    ' Resolve the specified base and relative Uri's .
    Private Shared Function
 ResolveUris(ByVal baseUri As Uri, ByVal
 relativeUri As String) As Uri
        Dim xmlResolver As New
 XmlUrlResolver()
        xmlResolver.Credentials = System.Net.CredentialCache.DefaultCredentials

        Dim xmlTransform As New
 XmlDsigXPathTransform()
        xmlTransform.Resolver = xmlResolver
        Dim absoluteUri As Uri = xmlResolver.ResolveUri(baseUri,
 relativeUri)

        If Not (absoluteUri Is
 Nothing) Then
            Console.WriteLine(vbLf + "Resolved the base Uri and
 relative Uri to the following:")
            Console.WriteLine(absoluteUri.ToString())
        Else
            Console.WriteLine("Unable to resolve the base Uri
 and relative Uri")
        End If
        Return absoluteUri

    End Function
End Class

using System;
using System.IO;
using System.Xml;
using System.Security.Cryptography;
using System.Security.Cryptography.Xml;

class Class1
{
    [STAThread]
    static void Main(string[]
 args)
    {
        // Encrypt a sample XML string.
        XmlDocument productsXml = LoadProducts();
        ShowTransformProperties(productsXml);

        // Encrypt an XPath Xml string.
        XmlDocument transformXml = LoadTransformByXml();
        ShowTransformProperties(transformXml);

        // Use XmlDsigXPathTransform to resolve a Uri.
        Uri baseUri = new Uri("http://www.contoso.com");
        string relativeUri = "xml";
        Uri absoluteUri = ResolveUris(baseUri, relativeUri);

        Console.WriteLine("This sample completed successfully; " +
            "press Enter to exit.");
        Console.ReadLine();
    }

    // Encrypt the text in the specified XmlDocument.
    private static void
 ShowTransformProperties(XmlDocument xmlDoc)
    {

        // Create a new XMLDocument object.
        XmlDocument doc = new XmlDocument();

        // Create a new XmlElement.
        XmlElement xPathElem = doc.CreateElement("XPath");

        // Set the element text to the value
        // of the XPath string.
        xPathElem.InnerText = "ancestor-or-self::PRODUCTS";

        // Create a new XmlDsigXPathTransform object.
        XmlDsigXPathTransform xmlTransform = new XmlDsigXPathTransform();

        // Load the XPath XML from the element. 
        xmlTransform.LoadInnerXml(xPathElem.SelectNodes("."));

        // Ensure the transform is using the proper algorithm.
        xmlTransform.Algorithm =
            SignedXml.XmlDsigXPathTransformUrl;

        // Retrieve the XML representation of the current transform.
        XmlElement xmlInTransform = xmlTransform.GetXml();

        Console.WriteLine("\nXml representation of the current transform: ");
        Console.WriteLine(xmlInTransform.OuterXml);

        // Retrieve the valid input types for the current transform.
        Type[] validInTypes = xmlTransform.InputTypes;

        // Verify the xmlTransform can accept the XMLDocument as an
        // input type.
        for (int i = 0; i < validInTypes.Length;
 i++)
        {
            if (validInTypes[i] == xmlDoc.GetType())
            {
                // Load the document into the transfrom.
                xmlTransform.LoadInput(xmlDoc);

                try
                {
                    // This transform is created for demonstration purposes.
                    XmlDsigXPathTransform secondTransform =
                        new XmlDsigXPathTransform();

                    string classDescription = secondTransform.ToString();

                    xmlTransform.LoadInnerXml(xPathElem.SelectNodes("."));
 ;
                }
                catch (CryptographicException)
                {
                    Console.WriteLine("Caught exception while
 trying to " +
                        "load the specified Xml document. The document "
 +
                        "requires an XPath element to be valid.");
                }
                break;
            }
        }

        Type[] validOutTypes = xmlTransform.OutputTypes;

        for (int i = validOutTypes.Length -
 1; i >= 0; i--)
        {
            if (validOutTypes[i] == typeof(System.Xml.XmlDocument))
            {
                try
                {
                    Type xmlDocumentType = typeof(System.Xml.XmlDocument);
                    XmlDocument xmlDocumentOutput = (XmlDocument)
                        xmlTransform.GetOutput(xmlDocumentType);

                    // Display to the console the Xml before and after
                    // encryption.
                    Console.WriteLine("Result of the GetOutput method call"
 +
                        " from the current transform: " +
                        xmlDocumentOutput.OuterXml);
                }
                catch (Exception ex)
                {
                    Console.WriteLine("Unexpected exception caught: " +
                        ex.ToString());
                }

                break;
            }
            else if (validOutTypes[i] == typeof(System.Xml.XmlNodeList))
            {
                try
                {
                    Type xmlNodeListType = typeof(System.Xml.XmlNodeList);
                    XmlNodeList xmlNodes = (XmlNodeList)
                        xmlTransform.GetOutput(xmlNodeListType);

                    // Display to the console the Xml before and after
                    // encryption.
                    Console.WriteLine("Encoding the following message: "
 +
                        xmlDoc.InnerText);

                    Console.WriteLine("Nodes of the XmlNodeList retrieved "
 +
                        "from GetOutput:");
                    for (int j = 0; j <
 xmlNodes.Count; j++)
                    {
                        Console.WriteLine("Node " + j +
                            " has the following name: " +
                            xmlNodes.Item(j).Name +
                            " and the following InnerXml: " +
                            xmlNodes.Item(j).InnerXml);
                    }
                }
                catch (Exception ex)
                {
                    Console.WriteLine("Unexpected exception caught: " +
                        ex.ToString());
                }

                break;
            }
            else
            {
                object outputObject = xmlTransform.GetOutput();
            }
        }
    }

    // Create an XML document for the dsig namespace.
    private static XmlDocument LoadTransformByXml()
    {
        XmlDocument xmlDoc = new XmlDocument();

        string transformXml = "<Signature><Reference
 URI=''><Transforms>";
        transformXml += "<Transform><XPath ";
        transformXml += "xmlns:dsig='http://www.w3.org/2000/09/xmldsig#'>";
        transformXml += "not(ancestor-or-self::dsig:Signature)";
        transformXml += "</XPath></Transform>";
        transformXml += "</Transforms></Reference></Signature>";

        xmlDoc.LoadXml(transformXml);
        return xmlDoc;
    }

    // Create an XML document describing various products.
    private static XmlDocument LoadProducts()
    {
        XmlDocument xmlDoc = new XmlDocument();

        string contosoProducts = "<PRODUCTS>";
        contosoProducts += "<PRODUCT><ID>123</ID>";
        contosoProducts += "<DESCRIPTION>Router</DESCRIPTION></PRODUCT>";
        contosoProducts += "<PRODUCT><ID>456</ID>";
        contosoProducts += "<DESCRIPTION>Keyboard</DESCRIPTION></PRODUCT>";
        contosoProducts += "<PRODUCT><ID>789</ID>";
        contosoProducts += "<DESCRIPTION>Monitor</DESCRIPTION></PRODUCT>";
        contosoProducts += "</PRODUCTS>";

        xmlDoc.LoadXml(contosoProducts);
        return xmlDoc;
    }

    // Resolve the specified base and relative Uri's .
    private static Uri ResolveUris(Uri baseUri,
 string relativeUri)
    {
        XmlUrlResolver xmlResolver = new XmlUrlResolver();
        xmlResolver.Credentials =
            System.Net.CredentialCache.DefaultCredentials;

        XmlDsigXPathTransform xmlTransform =
            new XmlDsigXPathTransform();
        xmlTransform.Resolver = xmlResolver;

        Uri absoluteUri = xmlResolver.ResolveUri(baseUri, relativeUri);

        if (absoluteUri != null)
        {
            Console.WriteLine(
                "\nResolved the base Uri and relative Uri
 to the following:");
            Console.WriteLine(absoluteUri.ToString());
        }
        else
        {
            Console.WriteLine(
                "Unable to resolve the base Uri and relative
 Uri");
        }
        return absoluteUri;
    }
}

プラットフォーム

バージョン情報

.NET Framework
サポート対象 : 2.0

参照

関連項目
SignedXml クラス
SignedXml メンバ
System.Security.Cryptography.Xml 名前空間

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