/// <summary>Creates and returns a permission that is the intersection of the current permission and the specified permission.</summary>
/// <returns>A new permission that represents the intersection of the current permission and the specified permission. This new permission is null if the intersection is empty.</returns>
/// <param name="target">A permission to intersect with the current permission. It must be the same type as the current permission. </param>
/// <exception cref="T:System.ArgumentException">The <paramref name="target" /> parameter is not null and is not of the same type as the current permission. </exception>
public override IPermission Intersect(IPermission target)
{
FileIOPermission fileIOPermission = FileIOPermission.Cast(target);
if (fileIOPermission == null)
{
return(null);
}
if (this.IsUnrestricted())
{
return(fileIOPermission.Copy());
}
if (fileIOPermission.IsUnrestricted())
{
return(this.Copy());
}
FileIOPermission fileIOPermission2 = new FileIOPermission(PermissionState.None);
fileIOPermission2.AllFiles = (this.m_AllFilesAccess & fileIOPermission.AllFiles);
fileIOPermission2.AllLocalFiles = (this.m_AllLocalFilesAccess & fileIOPermission.AllLocalFiles);
FileIOPermission.IntersectKeys(this.readList, fileIOPermission.readList, fileIOPermission2.readList);
FileIOPermission.IntersectKeys(this.writeList, fileIOPermission.writeList, fileIOPermission2.writeList);
FileIOPermission.IntersectKeys(this.appendList, fileIOPermission.appendList, fileIOPermission2.appendList);
FileIOPermission.IntersectKeys(this.pathList, fileIOPermission.pathList, fileIOPermission2.pathList);
return((!fileIOPermission2.IsEmpty()) ? fileIOPermission2 : null);
}