UIPermission.FromXml(SecurityElement) Method

Definition

Namespace:

System.Security.Permissions

Assembly:

System.Security.Permissions.dll

Source:

UIPermission.cs

Reconstructs a permission with a specified state from an XML encoding.

C#

public override void FromXml(System.Security.SecurityElement esd);

Parameters

esd

SecurityElement

The XML encoding used to reconstruct the permission.

Exceptions

ArgumentNullException

The esd parameter is null.

ArgumentException

The esd parameter is not a valid permission element.

-or-

The esd parameter's version number is not valid.

Examples

The following code example shows the behavior of the FromXml method. This example is part of a larger example provided for the UIPermission class.

Бележка

The code example is intended to show the behavior of the method, not to demonstrate its use. In general, the methods of permission classes are used by the security infrastructure; they are not typically used in applications.

C#

// ToXml creates an XML encoding of the permission and its current state; FromXml reconstructs a
// permission with the specified state from the XML encoding.
private static void ToFromXmlDemo()
{

    UIPermission uiPerm1 = new UIPermission(UIPermissionWindow.SafeTopLevelWindows);
    UIPermission uiPerm2 = new UIPermission(PermissionState.None);
    uiPerm2.FromXml(uiPerm1.ToXml());
    bool result = uiPerm2.Equals(uiPerm1);
    if (result)
    {
        Console.WriteLine("Result of ToFromXml = " + uiPerm2.ToString());
    }
    else
    {
        Console.WriteLine(uiPerm2.ToString());
        Console.WriteLine(uiPerm1.ToString());
    }
}

Applies to