Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / tx / System / Transactions / DistributedTransactionPermission.cs / 1305376 / DistributedTransactionPermission.cs
using System; using System.Security; using System.Security.Permissions; using System.Text; using System.Globalization; namespace System.Transactions { [SerializableAttribute()] public sealed class DistributedTransactionPermission: CodeAccessPermission, IUnrestrictedPermission { private bool unrestricted; public DistributedTransactionPermission(PermissionState state) { if(state == PermissionState.Unrestricted) { unrestricted = true; } else { unrestricted = false; } } public bool IsUnrestricted() { return unrestricted; } //Define the rest of your custom permission here. You must //implement IsUnrestricted, and override Copy, Intersect, //IsSubsetOf, ToXML, and FromXML. public override IPermission Copy() { DistributedTransactionPermission copy = new DistributedTransactionPermission(PermissionState.None); if(this.IsUnrestricted()) { copy.unrestricted = true; } else { copy.unrestricted = false; } return copy; } public override IPermission Intersect(IPermission target) { try { if(null == target) { return null; } DistributedTransactionPermission passedPermission = (DistributedTransactionPermission)target; if(!passedPermission.IsUnrestricted()) { return passedPermission; } return this.Copy(); } catch (InvalidCastException) { throw new ArgumentException( SR.GetString( SR.ArgumentWrongType ), "target"); } } public override IPermission Union(IPermission target) { try { if(null == target) { return this.Copy(); } DistributedTransactionPermission passedPermission = (DistributedTransactionPermission)target; if(passedPermission.IsUnrestricted()) { return passedPermission; } return this.Copy(); } catch (InvalidCastException) { throw new ArgumentException( SR.GetString( SR.ArgumentWrongType ), "target"); } } public override bool IsSubsetOf(IPermission target) { if(null == target) { return !this.unrestricted; } try { DistributedTransactionPermission passedPermission = (DistributedTransactionPermission)target; // If the current permission is "none" it will always be a subset of // any other DistributedTransactionPermission. if ( !this.unrestricted ) { return true; } // At this point, we know the current permission is unrestricted. If // the passed permission is unrestricted, we have a subset. if ( passedPermission.unrestricted ) { return true; } // If we get here, the current permission is unrestricted, but the passed // permission is "none", so the current permission is NOT a subset of // the passed permission. return false; } catch (InvalidCastException) { throw new ArgumentException( SR.GetString( SR.ArgumentWrongType ), "target"); } } public override SecurityElement ToXml() { SecurityElement element = new SecurityElement("IPermission"); Type type = this.GetType(); StringBuilder assemblyName = new StringBuilder(type.Assembly.ToString()); assemblyName.Replace('\"', '\''); element.AddAttribute("class", type.FullName + ", " + assemblyName); element.AddAttribute("version", "1"); element.AddAttribute("Unrestricted", unrestricted.ToString()); return element; } public override void FromXml(SecurityElement securityElement) { if ( null == securityElement ) { throw new ArgumentNullException( "securityElement" ); } if (!securityElement.Tag.Equals ("IPermission")) { throw new ArgumentException( SR.GetString( SR.ArgumentWrongType ), "securityElement" ); } string element = securityElement.Attribute("Unrestricted"); if(null != element) { this.unrestricted = Convert.ToBoolean(element, CultureInfo.InvariantCulture); } else { this.unrestricted = false; } } } [AttributeUsageAttribute(AttributeTargets.All, AllowMultiple = true)] public sealed class DistributedTransactionPermissionAttribute: CodeAccessSecurityAttribute { bool unrestricted = false; public new bool Unrestricted { get{ return unrestricted; } set{ unrestricted = value; } } public DistributedTransactionPermissionAttribute(SecurityAction action): base (action) { } public override IPermission CreatePermission() { if(Unrestricted) { return new DistributedTransactionPermission(PermissionState.Unrestricted); } else { return new DistributedTransactionPermission(PermissionState.None); } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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