private void toolStripButtonDelete_Click(object sender, EventArgs e)
{
if (trvwRsses.SelectedNode.Level == 2) //删除RSS节点
{
if (DialogResult.Yes ==
MessageBox.Show("真的要删除选中的RSS来源吗？", "警告", MessageBoxButtons.YesNo, MessageBoxIcon.Warning))
{
RssDAL.Delete(trvwRsses.SelectedNode.Name);
BindTreeView();
}
}
else if (trvwRsses.SelectedNode.Level == 1) //删除分类节点
{
string categoryID = trvwRsses.SelectedNode.Name;
if (DialogResult.Yes ==
MessageBox.Show("真的要删除选中的分类，包括分类下所有的RSS来源吗？", "警告", MessageBoxButtons.YesNo, MessageBoxIcon.Warning))
{
//删除分类下的所有 RSS 来源
foreach (
var r in
RssDAL.GetAllRsses().Where(r => r.Category.ToString() == categoryID))
{
RssDAL.Delete(r.ID.ToString());
}
//删除分类本身
CategoryDAL.Delete(categoryID);
BindTreeView();
}
}
}
private void BindTreeView()
{
trvwRsses.Nodes.Clear();
//增加根节点（全部分类）
TreeNode rootNode = new TreeNode("所有分类", 0, 0)
{
Name = "/"
};
trvwRsses.Nodes.Add(rootNode);
//增加所有分类
foreach (var category in CategoryDAL.GetAllCategories())
{
rootNode.Nodes.Add(new TreeNode(category.CategoryName, 1, 1)
{
Name = category.ID.ToString()
});
}
var rsses = RssDAL.GetAllRsses();
//增加所有 RSS 节点
foreach (TreeNode node in trvwRsses.Nodes["/"].Nodes)
{
foreach (var rss in rsses.Where(r => r.Category.ToString() == node.Name))
{
node.Nodes.Add(new TreeNode(rss.Title, 2, 2)
{
Name = rss.ID.ToString(),
ToolTipText = rss.Description
});
}
}
trvwRsses.ExpandAll();
}