mydatagrid.cs

企业内部的短信交流管理平台。 设计详细

using System;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.ComponentModel;

namespace MyControls
{
	/// <summary>
	/// MyDataGrid 的摘要说明。
	/// </summary>
	[DefaultProperty("Text"),
	ToolboxData("<{0}:MyDataGrid runat=server></{0}:MyDataGrid>")]
	public class MyDataGrid : DataGrid
	{
		public const string MyDataGridPageEventCommandName = "MyPage";
		public const string FisrtPageText = "首页";
		public const string FisrtPageCommandArgument = "Fisrt";

		public const string EndPageText = "尾页";
		public const string EndPageCommandArgument = "End";


		protected override void OnItemCreated(DataGridItemEventArgs e)
		{
			if (e.Item.ItemType == ListItemType.Pager)
			{
				if (this.AllowPaging && this.PagerStyle.Mode == PagerMode.NextPrev)
				{
					if (this.CurrentPageIndex > 0)
					{
						LinkButton lb;
						lb = new LinkButton();
						lb.Text = FisrtPageText;
						lb.CommandName = MyDataGridPageEventCommandName;
						lb.CommandArgument = FisrtPageCommandArgument;

						e.Item.Cells[0].Controls.AddAt(0, new LiteralControl(" "));
						e.Item.Cells[0].Controls.AddAt(0, lb);
					}
					else
					{
						e.Item.Cells[0].Controls.AddAt(0, new LiteralControl(FisrtPageText + "  "));
					}

					if (this.CurrentPageIndex < this.PageCount - 1)
					{
						LinkButton lb;
						lb = new LinkButton();
						lb.Text = EndPageText;
						lb.CommandName = MyDataGridPageEventCommandName;
						lb.CommandArgument = EndPageCommandArgument;

						e.Item.Cells[0].Controls.Add(new LiteralControl(" "));
						e.Item.Cells[0].Controls.Add(lb);
					}
					else
					{
						e.Item.Cells[0].Controls.Add(new LiteralControl("  " + EndPageText));
					}
				}
				Label lab = new Label();
				lab.Text = " 当前第" +
					(CurrentPageIndex + 1)
					+ "页，共" +
					PageCount
					+ "页 ";
				e.Item.Cells[0].Controls.Add(lab);


				DropDownList dl = new DropDownList();
				dl.Items.Clear();
				for (int i = 1; i <= PageCount; i++)
					dl.Items.Add(i.ToString());
				dl.SelectedValue = Convert.ToString(CurrentPageIndex + 1);
				dl.AutoPostBack = true;
				dl.SelectedIndexChanged += new EventHandler(dl_SelectedIndexChanged);
				e.Item.Cells[0].Controls.Add(dl);
			}
			base.OnItemCreated(e);
		}
		protected override void OnItemCommand(DataGridCommandEventArgs e)
		{
			if (this.AllowPaging && this.PagerStyle.Mode == PagerMode.NextPrev)
			{
				if (e.CommandName == MyDataGridPageEventCommandName)
				{
					if (e.CommandArgument.Equals(FisrtPageCommandArgument))
					{
						OnPageIndexChanged(new DataGridPageChangedEventArgs(this, 0));
					}
					if (e.CommandArgument.Equals(EndPageCommandArgument))
					{
						OnPageIndexChanged(new DataGridPageChangedEventArgs(this, this.PageCount - 1));
					}
				}
			}
			base.OnItemCommand(e);
		}

		private void dl_SelectedIndexChanged(object sender, EventArgs e)
		{
			OnPageIndexChanged(new DataGridPageChangedEventArgs(this,
				Convert.ToInt32(((DropDownList)sender).SelectedValue) - 1
				));
		}
	}
}