AsymmetricAlgorithm.FromXmlString(String) Méthode

Référence

Définition

Espace de noms:: System.Security.Cryptography

Assembly:: System.Security.Cryptography.Primitives.dll

Assembly:: System.Security.Cryptography.dll

Assembly:: mscorlib.dll

Assembly:: netstandard.dll

Source:: AsymmetricAlgorithm.cs

Source:: AsymmetricAlgorithm.cs

Source:: AsymmetricAlgorithm.cs

Important

Certaines informations portent sur la préversion du produit qui est susceptible d’être en grande partie modifiée avant sa publication. Microsoft exclut toute garantie, expresse ou implicite, concernant les informations fournies ici.

En cas de substitution dans une classe dérivée, reconstruit un objet AsymmetricAlgorithm à partir d'une chaîne XML. Sinon, lève un NotImplementedException.

public:
 virtual void FromXmlString(System::String ^ xmlString);

public:
 abstract void FromXmlString(System::String ^ xmlString);

public virtual void FromXmlString (string xmlString);

public abstract void FromXmlString (string xmlString);

abstract member FromXmlString : string -> unit
override this.FromXmlString : string -> unit

abstract member FromXmlString : string -> unit

Public Overridable Sub FromXmlString (xmlString As String)

Public MustOverride Sub FromXmlString (xmlString As String)

Paramètres

xmlString: String

Chaîne XML à utiliser pour reconstruire l'objet AsymmetricAlgorithm.

Exemples

L’exemple de code suivant montre comment implémenter la FromXmlString méthode pour analyser la chaîne XML spécifiée afin de remplir l’objet actuel CspParameters . Cet exemple de code fait partie d’un exemple plus grand fourni pour la AsymmetricAlgorithm classe .

    // Expected XML schema:
    //      <ProviderName></ProviderName>
    //      <KeyContainerName></KeyContainerName>
    //      <KeyNumber></KeyNumber>
    //      <ProviderType></ProviderType>
public:
    virtual void FromXmlString(String^ xmlString) override 
    {
        if (xmlString != nullptr)
        {
            XmlDocument^ document = gcnew XmlDocument();
            document->LoadXml(xmlString);
            XmlNode^ firstNode = document->FirstChild;
            XmlNodeList^ nodeList;

            // Assemble parameters from values in each XML element.
            cryptoServiceParameters = gcnew CspParameters();

            // KeyContainerName is optional.
            nodeList = 
                document->GetElementsByTagName("KeyContainerName");
            if (nodeList->Count > 0)
            {
                cryptoServiceParameters->KeyContainerName =
                    nodeList->Item(0)->InnerText;
            }

            // KeyNumber is optional.
            nodeList = document->GetElementsByTagName("KeyNumber");
            if (nodeList->Count > 0)
            {
                cryptoServiceParameters->KeyNumber =
                    Int32::Parse(nodeList->Item(0)->InnerText);
            }

            // ProviderName is optional.
            nodeList = document->GetElementsByTagName("ProviderName");
            if (nodeList->Count > 0)
            {
                cryptoServiceParameters->ProviderName =
                    nodeList->Item(0)->InnerText;
            }

            // ProviderType is optional.
            nodeList = document->GetElementsByTagName("ProviderType");
            if (nodeList->Count > 0)
            {
                cryptoServiceParameters->ProviderType =
                    Int32::Parse(nodeList->Item(0)->InnerText);
            }
        }
        else
        {
            throw gcnew ArgumentNullException("xmlString");
        }
    }

// Expected XML schema:
//      <ProviderName></ProviderName>
//      <KeyContainerName></KeyContainerName>
//      <KeyNumber></KeyNumber>
//      <ProviderType></ProviderType>
public override void FromXmlString(string xmlString)
{
    if (xmlString != null)
    {
        XmlDocument doc = new XmlDocument();
        doc.LoadXml(xmlString);
        XmlNode firstNode = doc.FirstChild;
        XmlNodeList nodeList;

        // Assemble parameters from values in each XML element.
        cspParameters = new CspParameters();

        // KeyContainerName is optional.
        nodeList = doc.GetElementsByTagName("KeyContainerName");
        string keyName = nodeList.Item(0).InnerText;
        if (keyName != null) 
        {
            cspParameters.KeyContainerName = keyName;
        }

        // KeyNumber is optional.
        nodeList = doc.GetElementsByTagName("KeyNumber");
        string keyNumber = nodeList.Item(0).InnerText;
        if (keyNumber != null) 
        {
            cspParameters.KeyNumber = Int32.Parse(keyNumber);
        }

        // ProviderName is optional.
        nodeList = doc.GetElementsByTagName("ProviderName");
        string providerName = nodeList.Item(0).InnerText;
        if (providerName != null) 
        {
            cspParameters.ProviderName = providerName;
        }

        // ProviderType is optional.
        nodeList = doc.GetElementsByTagName("ProviderType");
        string providerType = nodeList.Item(0).InnerText;
        if (providerType != null) 
        {
            cspParameters.ProviderType = Int32.Parse(providerType);
        }
    }
    else
    {
        throw new ArgumentNullException("xmlString");
    }
}

' Expected XML schema:
'      <ProviderName></ProviderName>
'      <KeyContainerName></KeyContainerName>
'      <KeyNumber></KeyNumber>
'      <ProviderType></ProviderType>
Public Overrides Sub FromXmlString(ByVal xmlString As String)
    If Not xmlString Is Nothing Then
        Dim doc As New XmlDocument
        doc.LoadXml(xmlString)
        Dim firstNode As XmlNode = doc.FirstChild
        Dim nodeList As XmlNodeList

        ' Assemble parameters from values in each XML element.
        cspParameters = New CspParameters

        ' KeyContainerName is optional.
        nodeList = doc.GetElementsByTagName("KeyContainerName")
        Dim keyName As String = nodeList.Item(0).InnerText
        If Not keyName Is Nothing Then
            cspParameters.KeyContainerName = keyName
        End If

        ' KeyNumber is optional.
        nodeList = doc.GetElementsByTagName("KeyNumber")
        Dim keyNumber As String = nodeList.Item(0).InnerText
        If Not keyNumber Is Nothing Then
            cspParameters.KeyNumber = Int32.Parse(keyNumber)
        End If

        ' ProviderName is optional.
        nodeList = doc.GetElementsByTagName("ProviderName")
        Dim providerName As String = nodeList.Item(0).InnerText
        If Not providerName Is Nothing Then
            cspParameters.ProviderName = providerName
        End If

        ' ProviderType is optional.
        nodeList = doc.GetElementsByTagName("ProviderType")
        Dim providerType As String = nodeList.Item(0).InnerText
        If Not providerType Is Nothing Then
            cspParameters.ProviderType = Int32.Parse(providerType)
        End If
    Else
        Throw New ArgumentNullException("xmlString")
    End If
End Sub

S’applique à

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