用Timer实现
/// <summary>
/// 打开地图文档Mxd命令
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void Open_Click(object sender, EventArgs e)
{
if (this.axMapControl1.LayerCount > 0)
{
DialogResult result = MessageBox.Show("是否保存当前地图？", "警告",
MessageBoxButtons.YesNoCancel, MessageBoxIcon.Question);
if (result == DialogResult.Cancel) return;
if (result == DialogResult.Yes) this.Save_Click(null, null);
}
OpenNewMapDocument openMapDoc =new OpenNewMapDocument(m_controlsSynchronizer);
openMapDoc.OnCreate(m_controlsSynchronizer.MapControl.Object);
openMapDoc.OnClick();
}

你所谓的动态加载是什么意思？