[原创]DataGrid分页，排序(正序反序)功能及注意点

当DataGrid同时具有分页和排序功能时应注意在重新绑定数据源时，MyDataGrid.CurrentPageIndex=0;
下面给实现以上功能的原码，也就不多缀了
aspx中包含有DataGrid和控制其数据源变化的dropdownlist
DataGrid代码
<asp:datagrid id="MyDataGrid" runat="server" BorderColor="#CCCCCC" Font-Size="100%" HorizontalAlign="Center"
AutoGenerateColumns="False" OnDeleteCommand="MyDataGrid_Delete" OnSortCommand="Sort_Grid" OnPageIndexChanged="MyDataGrid_PageIndexChanged"
DataKeyField="ACC_NO" PagerStyle-Position="Bottom" PagerStyle-HorizontalAlign="Center" PagerStyle-Mode="NextPrev"
PageSize="10" AllowSorting="True" AllowPaging="True" CellPadding="4" Width="100%">
<AlternatingItemStyle BackColor="#E9E9E6"></AlternatingItemStyle>
<HeaderStyle Font-Bold="True" Wrap="False" ForeColor="White" BackColor="#999999"></HeaderStyle>
<Columns>
<asp:ButtonColumn Text="口" CommandName="Delete"></asp:ButtonColumn>
<asp:BoundColumn DataField="NO" SortExpression="NO" ReadOnly="True" HeaderText="序号"></asp:BoundColumn>
<asp:BoundColumn DataField="ID" SortExpression="ID" HeaderText="ID"></asp:BoundColumn>
<asp:BoundColumn DataField="NAME" SortExpression="NAME" HeaderText="名称"></asp:BoundColumn>
<asp:BoundColumn DataField="C_NAME" SortExpression="C_NAME" HeaderText="各科名称"></asp:BoundColumn>
<asp:BoundColumn DataField="FLG" SortExpression="FLG" HeaderText="项目"></asp:BoundColumn>
</Columns>
<PagerStyle NextPageText="下10件" PrevPageText="返回" HorizontalAlign="Center"></PagerStyle>
</asp:datagrid>

dropdownlist代码
<asp:dropdownlist id="ddlWk" Runat="server" AutoPostBack="True" Enabled="False">
<asp:ListItem Value="0">东京</asp:ListItem>
<asp:ListItem Value="3">九州</asp:ListItem>
<asp:ListItem Value="8">北海道</asp:ListItem>
<asp:ListItem Value="9">四国</asp:ListItem>
</asp:dropdownlist>

aspx.cs文件代码核心如下：

protected static string SortExp;//排序用

private void Page_Load(object sender, System.EventArgs e)
{
if(!IsPostBack)
{
Session["WP"] ="0";
SortExp="";//初始化
ddlWk_getS();
BindGrid(); //DateGrid获取数据并绑定数据源
}
}
private void ddlWk_getS()
{
switch (Session["WP"].ToString())
{
case "0":ddlWk.SelectedIndex=0;
break;
case "3":ddlWk.SelectedIndex=1;
break;
case "8":ddlWk.SelectedIndex=2;
break;
case "9":ddlWk.SelectedIndex=3;
break;
default:ddlWk.SelectedIndex=0;
break;
}
}
protected void BindGrid()
{
DataView dv = GetData().Tables["vCO"].DefaultView;
if(SortExp!="")
dv.Sort=SortExp;//给数据源加排序
MyDataGrid.DataSource=dv;
MyDataGrid.DataBind();
//COUNT.Text=MyDataGrid.Columns.Count.ToString();
}

/// <summary>
/// 返回Data
/// </summary>
///<returns></returns>
private DataSet GetData()
{
string strConn=(String) ((NameValueCollection) Context.GetConfig("system.web/database"))["strConn"];
using (SqlConnection conn = new SqlConnection(strConn))
{
SqlCommand cmd = new SqlCommand("sp_C",conn);
cmd.CommandType=CommandType.StoredProcedure;
cmd.Parameters.Add("@place",SqlDbType.VarChar,2);
cmd.Parameters["@place"].Value=Session["WP"].ToString();
conn.Open();

SqlDataAdapter da = new SqlDataAdapter();
da.SelectCommand=cmd;
DataSet ds=new DataSet();
da.Fill(ds,"vCO");
Count.Text="ヒット："+ds.Tables["vCO"].Rows.Count.ToString()+"件";
return ds;
}

}
/// <summary>
///从DataSet中除一
/// </summary>
/// <param name="sender"></param>
/// <param name="E"></param>
protected void MyDataGrid_Delete(Object sender, DataGridCommandEventArgs E)
{
String strID=MyDataGrid.DataKeys[(int)E.Item.ItemIndex].ToString();
//删除操作
}
/// <summary>
/// 分页操作
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void MyDataGrid_PageIndexChanged(object source, DataGridPageChangedEventArgs e)
{
MyDataGrid.CurrentPageIndex=e.NewPageIndex;
BindGrid();
}
/// <summary>
/// 排序
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void Sort_Grid(object sender, DataGridSortCommandEventArgs e)
{
if(SortExp==e.SortExpression)
SortExp+=" DESC";
else
SortExp= e.SortExpression;
BindGrid();
}

#region Web override protected void OnInit(EventArgs e)
{
// //
InitializeComponent();
base.OnInit(e);
}

/// <summary> /// </summary>
private void InitializeComponent()
{
this.ddlWk.SelectedIndexChanged += new System.EventHandler(this.ddlWk_SelectedIndexChanged);
this.Load += new System.EventHandler(this.Page_Load);

}
#endregion

private void ddlWk_SelectedIndexChanged(object sender, System.EventArgs e)
{
Session["WP"]=ddlWk.SelectedValue;
MyDataGrid.CurrentPageIndex=0;//没有这一句，当该页码超出其他数据源的范围时会出错
BindGrid();
}

强调一个DataGrid格式化输出的代码
<asp:TemplateColumn>
<HeaderTemplate>
年月日
</HeaderTemplate>
<ItemTemplate>
<asp:Label Runat=server text='<%# DataBinder.Eval(Container,"DataItem.TD_Date","{0:d}")%>' ID="Label1">//输出日期数据的年月日，而不显示小时分钟秒
</asp:Label>
</ItemTemplate>
</asp:TemplateColumn>