以TreeView形式显示时间

效果图：

    /// <summary>
    /// 绑定时间
    /// </summary>
    /// <param name="dtSource">数据源</param>
    /// <param name="columnName">用于显示时间列的列称</param>
    /// <param name="sort">排序方式：desc,asc</param>
    private void BindTreeViewDate(DataTable dtSource, string columnName, string sort)
    {
        DataTable dt = new DataTable();
        DataColumn[] cols = new DataColumn[1];

        cols[0] = new DataColumn();
        cols[0].ColumnName = "sortDate";
        dt.Columns.Add(cols[0]);

        dt.PrimaryKey = cols;

        foreach (DataRow row in dtSource.Select("1=1", columnName + " " + sort))
        {
            object obj = row[columnName];
            if (dt.Rows.Find(obj) == null)
            {
                dt.Rows.Add(obj);
            }
        }

        tvDate.Nodes.Clear();
        TreeNode nodeSelect = new TreeNode();
        TreeNode nodeSelectM = new TreeNode();
        TreeNode nodeSelectY = new TreeNode();

        if (dt != null && dt.Rows.Count > 0)
        {
            //绑定第一行时间
            TreeNode tn1 = new TreeNode();
            TreeNode tn2 = new TreeNode();
            TreeNode tn3 = new TreeNode();
            DateTime date = Convert.ToDateTime(dt.Rows[0][0].ToString());

            tn1.Text = date.Year.ToString() + "年";
            tn1.ToolTip = date.ToShortDateString();
            tvDate.Nodes.Add(tn1);

            tn2.Text = date.Month.ToString() + "月";
            tn2.ToolTip = date.ToShortDateString();
            tn1.ChildNodes.Add(tn2);

            tn3.Text = date.Day.ToString() + "日";
            tn3.ToolTip = date.ToShortDateString();
            tn2.ChildNodes.Add(tn3);

            dt.Rows.RemoveAt(0); //移除第一行

            foreach (DataRow row in dt.Rows)
            {
                DateTime dateNext = Convert.ToDateTime(row[0].ToString());

                //绑定年
                if (string.Compare(dateNext.Year.ToString() + "年", tn1.Text) != 0)
                {
                    tn1 = new TreeNode();
                    tn2 = new TreeNode();
                    tn3 = new TreeNode();

                    tn1.Text = dateNext.Year.ToString() + "年";
                    tn1.ToolTip = dateNext.ToShortDateString();
                    tvDate.Nodes.Add(tn1);

                    tn2.Text = dateNext.Month.ToString() + "月";
                    tn2.ToolTip = dateNext.ToShortDateString();
                    tn1.ChildNodes.Add(tn2);

                    tn3.Text = dateNext.Day.ToString() + "日";
                    tn3.ToolTip = dateNext.ToShortDateString();
                    tn2.ChildNodes.Add(tn3);

                    if (nodeSelectY == null && dateNext.Year.ToString() == DateTime.Now.Year.ToString())
                    {
                        nodeSelectY = tn1;
                    }
                }
                //绑定月
                else if (string.Compare(dateNext.Month.ToString() + "月", tn2.Text) != 0)
                {
                    tn2 = new TreeNode();
                    tn3 = new TreeNode();

                    tn2.Text = dateNext.Month.ToString() + "月";
                    tn2.ToolTip = dateNext.ToShortDateString();
                    tn1.ChildNodes.Add(tn2);

                    tn3.Text = dateNext.Day.ToString() + "日";
                    tn3.ToolTip = dateNext.ToShortDateString();
                    tn2.ChildNodes.Add(tn3);

                    if (nodeSelectM == null && dateNext.ToString("yyyyMM") == DateTime.Now.ToString("yyyyMM"))
                    {
                        nodeSelectM = tn2;
                    }
                }
                //绑定日
                else
                {
                    tn3 = new TreeNode();

                    tn3.Text = dateNext.Day.ToString() + "日";
                    tn3.ToolTip = dateNext.ToShortDateString();
                    tn2.ChildNodes.Add(tn3);

                    if (dateNext.ToShortDateString() == DateTime.Now.ToShortDateString())
                    {
                        nodeSelect = tn3;
                    }
                }
            }
        }

        tvDate.CollapseAll();
    }

以上时ASP.NET中代码，如果在WinForm中使用，请将“ToolTip”改为“Tag”，将“ChildNodes”改为“Nodes”。