private void menuEnableAttachment_Click(object sender, EventArgs e)
{
myTreeNode selectNode = this.tv_CatalogTree.SelectedNode as myTreeNode;
IFeatureClass fc = selectNode.Tag as IFeatureClass;
if (fc.HasAttachments())
{
if (MessageBox.Show("禁用附件功能会删除所有现存的附件，请确认！", "警告", MessageBoxButtons.OKCancel, MessageBoxIcon.Warning) == DialogResult.OK)
{
fc.DisableAttachment();
}
}
else
{
fc.EnableAttachment();
}
}