ISecurityEncodable.FromXml(SecurityElement) Method

Reference

Definition

Namespace:: System.Security

Assemblies:: netstandard.dll, System.Runtime.dll

Assembly:: System.Runtime.Extensions.dll

Assembly:: mscorlib.dll

Assembly:: netstandard.dll

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

Reconstructs a security object with a specified state from an XML encoding.

public:
 void FromXml(System::Security::SecurityElement ^ e);

public void FromXml(System.Security.SecurityElement e);

abstract member FromXml : System.Security.SecurityElement -> unit

Public Sub FromXml (e As SecurityElement)

Parameters

e: SecurityElement

The XML encoding to use to reconstruct the security object.

Examples

The following code example demonstrates implementing the FromXml method. This code example is part of a larger example provided for the ISecurityEncodable class.

    // Populate the permission's fields from XML.
public:
    virtual void FromXml(SecurityElement^ element) override
    {
        specifiedAsUnrestricted = false;
        stateFlags = (SoundPermissionState)0;

        // If XML indicates an unrestricted permission, 
        // make this permission unrestricted.
        String^ attributeString = 
            (String^) element->Attributes["Unrestricted"];
        if (attributeString != nullptr)
        {
            specifiedAsUnrestricted = Convert::ToBoolean(attributeString);
            if (specifiedAsUnrestricted)
            {
                stateFlags = SoundPermissionState::PlayAnySound;
            }
        }

        // If XML indicates a restricted permission, parse the flags.
        if (!specifiedAsUnrestricted)
        {
            attributeString = (String^) element->Attributes["Flags"];
            if (attributeString != nullptr)
            {
                stateFlags = (SoundPermissionState) Convert::ToInt32(
                    Enum::Parse(SoundPermissionState::typeid, 
                    attributeString, true));
            }
        }
    }

// Populate the permission's fields from XML.
public override void FromXml(SecurityElement e)
{
    m_specifiedAsUnrestricted = false;
    m_flags = 0;

    // If XML indicates an unrestricted permission, make this permission unrestricted.
    String s = (String)e.Attributes["Unrestricted"];
    if (s != null)
    {
        m_specifiedAsUnrestricted = Convert.ToBoolean(s);
        if (m_specifiedAsUnrestricted)
            m_flags = SoundPermissionState.PlayAnySound;
    }

    // If XML indicates a restricted permission, parse the flags.
    if (!m_specifiedAsUnrestricted)
    {
        s = (String)e.Attributes["Flags"];
        if (s != null)
        {
            m_flags = (SoundPermissionState)
            Convert.ToInt32(Enum.Parse(typeof(SoundPermission), s, true));
        }
    }
}

' Populate the permission's fields from XML.
Public Overrides Sub FromXml(ByVal e As SecurityElement)
    m_specifiedAsUnrestricted = False
    m_flags = 0

    ' If XML indicates an unrestricted permission, make this permission unrestricted.
    Dim s As String = CStr(e.Attributes("Unrestricted"))
    If Not (s Is Nothing) Then
        m_specifiedAsUnrestricted = Convert.ToBoolean(s)
        If m_specifiedAsUnrestricted Then
            m_flags = SoundPermissionState.PlayAnySound
        End If
    End If
    ' If XML indicates a restricted permission, parse the flags.
    If Not m_specifiedAsUnrestricted Then
        s = CStr(e.Attributes("Flags"))
        If Not (s Is Nothing) Then
            m_flags = CType(Convert.ToInt32([Enum].Parse(GetType(SoundPermission), s, True)), SoundPermissionState)
        End If
    End If

End Sub

Remarks

Custom code that extends security objects needs to implement the ToXml and FromXml methods to make the objects security-encodable.

Applies to

Proizvod	Verzije
.NET	Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9, 10
.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

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