/// <summary>Creates a permission that is the union of the current permission and the specified permission.</summary>
/// <returns>A new permission that represents the union of the current permission and the specified permission.</returns>
/// <param name="other">A permission to combine with the current permission. It must be the same type as the current permission. </param>
/// <exception cref="T:System.ArgumentException">The <paramref name="other" /> parameter is not null and is not of the same type as the current permission. </exception>
public override IPermission Union(IPermission other)
{
FileIOPermission fileIOPermission = FileIOPermission.Cast(other);
if (fileIOPermission == null)
{
return(this.Copy());
}
if (this.IsUnrestricted() || fileIOPermission.IsUnrestricted())
{
return(new FileIOPermission(PermissionState.Unrestricted));
}
if (this.IsEmpty() && fileIOPermission.IsEmpty())
{
return(null);
}
FileIOPermission fileIOPermission2 = (FileIOPermission)this.Copy();
fileIOPermission2.AllFiles |= fileIOPermission.AllFiles;
fileIOPermission2.AllLocalFiles |= fileIOPermission.AllLocalFiles;
string[] array = fileIOPermission.GetPathList(FileIOPermissionAccess.Read);
if (array != null)
{
FileIOPermission.UnionKeys(fileIOPermission2.readList, array);
}
array = fileIOPermission.GetPathList(FileIOPermissionAccess.Write);
if (array != null)
{
FileIOPermission.UnionKeys(fileIOPermission2.writeList, array);
}
array = fileIOPermission.GetPathList(FileIOPermissionAccess.Append);
if (array != null)
{
FileIOPermission.UnionKeys(fileIOPermission2.appendList, array);
}
array = fileIOPermission.GetPathList(FileIOPermissionAccess.PathDiscovery);
if (array != null)
{
FileIOPermission.UnionKeys(fileIOPermission2.pathList, array);
}
return(fileIOPermission2);
}