private void _setLength(long len)
{
var e = new InterceptableStreamLengthEventArgs(len, null);
this.ChangeLength(this, e);
if (e.Exception != null)
{
throw e.Exception;
}
}
// 非公開メソッド
private long _getLength()
{
var e = new InterceptableStreamLengthEventArgs(0, null);
this.GettingLength(this, e);
if (e.Exception != null)
{
throw e.Exception;
}
return(e.Length);
}