ISecurityEncodable.FromXml(SecurityElement) 方法

定義

命名空間:
System.Security
組件:
netstandard.dll, System.Runtime.dll
組件:
System.Runtime.Extensions.dll
組件:
mscorlib.dll
組件:
netstandard.dll
來源:
ISecurityEncodable.cs
來源:
ISecurityEncodable.cs
來源:
FileSystem.Exists.Unix.cs

從 XML 編碼中重建具有指定狀態的安全物件。

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)

參數

e
SecurityElement

用來重建安全物件的 XML 編碼。

範例

以下程式碼範例示範了該 FromXml 方法的實作。 此程式碼範例是本類別更大範例 ISecurityEncodable 的一部分。

// 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

備註

擴充安全物件的自訂程式碼需要實作 和 ToXmlFromXml 方法，使物件可安全編碼。

適用於