FromXmlString Method
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AsymmetricAlgorithm.FromXmlString Method

When overridden in a derived class, reconstructs an AsymmetricAlgorithm object from an XML string.

Namespace:  System.Security.Cryptography
Assembly:  mscorlib (in mscorlib.dll)

public abstract void FromXmlString(
	string xmlString


Type: System.String

The XML string to use to reconstruct the AsymmetricAlgorithm object.

The following code example demonstrates how to implement the FromXmlString method to parse the specified XML string to populate the current CspParameters object. This code example is part of a larger example provided for the AsymmetricAlgorithm class.

// Expected XML schema: 
//  <CustomCryptoKeyValue> 
//      <ProviderName></ProviderName> 
//      <KeyContainerName></KeyContainerName> 
//      <KeyNumber></KeyNumber> 
//      <ProviderType></ProviderType> 
//  </CustomCryptoKeyValue> 
public override void FromXmlString(string xmlString)
    if (xmlString != null)
        XmlDocument doc = new XmlDocument();
        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);
        throw new ArgumentNullException("xmlString");

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, 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, 1.1, 1.0

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