SortExpression 的问题
当gridview 和数据源控件邦定的时候，点击排序 SortExpression 就有值当我是自定义数据邦定的时候
String sCon = ConfigurationManager.ConnectionStrings["pubConnectString"].ConnectionString;
SqlConnection con = new SqlConnection(sCon);
SqlDataAdapter sda = new SqlDataAdapter("select * from authors", con);
DataSet ds = new DataSet();
sda.Fill(ds);
MyGridView1.DataSource = ds;
MyGridView1.DataBind();
con.Close();
点击排序的时候SortExpression ="" 为什么呢。怎么让他出来？ --------------------编程问答-------------------- ..up --------------------编程问答-------------------- 顶下 --------------------编程问答-------------------- using System;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using TedaBus.RFPrincipal;
/// <summary>
/// 行政用车申请列表页面
/// 创建：叶明
/// 创建日期：2007-03-09
/// 修改记录：
/// </summary>
public partial class OfficeUseBus_ApplyUseBusList : SimpleCode
{
DataSet ds = new DataSet("BusUseRecord"); //存储申请记录的数据集
protected override void OnInit(EventArgs e)
{
base.OnInit(e);
}
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
BindUseBusRecordList();
}
}
protected void btnShowFilter_Click(object sender, EventArgs e)
{
//设置筛选Panel的可见性
pnlFilter.Visible = !pnlFilter.Visible;
}
/// <summary>
/// 绑定行政用车记录GridView
/// 涉及数据表:OfficeUseBusRecord
/// </summary>
private void BindUseBusRecordList()
{
string sql = "SELECT * FROM OfficeUseBusRecord WHERE valid = 1 AND DeptID = " + GetCurrentUserDeptID();
SqlConnection conn = new SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings["TedabusMIS"].ToString());
SqlDataAdapter sda = new SqlDataAdapter(sql, conn);
sda.Fill(ds);
DataView dv = ds.Tables[0].DefaultView;
//对于数据视图的RowFilter选项,我先将其赋值为一个总是为真的条件,然后根据用户的选择逐步增加其限制
string filterString = "1 = 1";
//处理开始查询的日期
if (ViewState["StartDate"] != null)
{
if (ViewState["StartDate"].ToString() != string.Empty)
{
filterString += " and UserBusDate > #" + ViewState["StartDate"].ToString() + "#";
}
}
//处理最晚查询的日期
if (ViewState["EndDate"] != null)
{
if (ViewState["EndDate"].ToString() != string.Empty)
{
filterString += " and UserBusDate < #" + ViewState["EndDate"].ToString() + "#";
}
}
dv.RowFilter = filterString;
//处理GridView的排序
if (ViewState["sort"] != null)
{
if(ViewState["sort"].ToString() != string.Empty)
{
dv.Sort = ViewState["sort"].ToString();
}
else
{
dv.Sort = "";
}
}
gvUseBusRecord.DataSource = dv;
gvUseBusRecord.DataBind();
}
protected void gvUseBusRecord_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow) //只处理数据行
{
//将GridView中的日期显示为短日期
DateTime dt = DateTime.Parse(e.Row.Cells[0].Text);
e.Row.Cells[0].Text = dt.ToShortDateString();
//把申请的批准状态映射为中文
DataRowView row = (DataRowView)e.Row.DataItem;
e.Row.Cells[0].ToolTip = row["RecordID"].ToString();
if ((int)row["Status"] == 0)
{
e.Row.Cells[5].Text = "未批准";
e.Row.Cells[5].ForeColor = System.Drawing.Color.Red;
}
else if ((int)row["Status"] == 1)
{
e.Row.Cells[5].Text = "已批准";
e.Row.Cells[5].ForeColor = System.Drawing.Color.Green;
//如果申请已经批准了,就不能撤销了
LinkButton lb = (LinkButton)e.Row.Cells[7].Controls[0];
lb.Enabled = false;
}
//设置查看LinkButton的PostUrl,这样用户点击的时候会转到申请查看的页面
LinkButton lbView = (LinkButton)e.Row.Cells[8].FindControl("lbView");
lbView.PostBackUrl = "ViewBusUseApply.aspx?RecordID=" + row["RecordID"].ToString();
//为撤销按钮添加确认对话框
LinkButton lbDelete = (LinkButton)e.Row.Cells[7].Controls[0];
lbDelete.Attributes.Add("OnClick","return confirm('您是否要撤销这个申请？');");
}
}
protected void gvUseBusRecord_Sorting(object sender, GridViewSortEventArgs e)
{
//把GridView的排序表达式存储在ViewState中,然后重新绑定GridView
ViewState["sort"] = e.SortExpression;
BindUseBusRecordList();
}
protected void gvUseBusRecord_PageIndexChanging(object sender, GridViewPageEventArgs e)
{
//把GridVew得到PageIndex设置为新值,然后重新绑定GridView
gvUseBusRecord.PageIndex = e.NewPageIndex;
BindUseBusRecordList();
}
protected void btnSetFilter_Click(object sender, EventArgs e)
{
//用户点击设置筛选条件的按钮时,我把筛选条件存入ViewState,具体的工作,绑定GridView的时候会处理
ViewState["StartDate"] = txtStart.Text;
ViewState["EndDate"] = txtEnd.Text;
BindUseBusRecordList();
}
protected void gvUseBusRecord_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
//点击删除的时候,只是将Valid字段设置为0,并没有物理删除
//如果其他表中出现过的车辆被"删除",可以避免出现错误
string sql = "UPDATE OfficeUseBusRecord SET valid = 0 WHERE RecordID = " + gvUseBusRecord.Rows[e.RowIndex].Cells[0].ToolTip ;
SqlConnection conn = new SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings["TedabusMIS"].ToString());
SqlCommand cmd = new SqlCommand(sql, conn);
conn.Open();
if(cmd.ExecuteNonQuery() > 0)
{
BindUseBusRecordList();
RegisterStartupScript("message","<script language='JavaScript'>alert('删除成功');</script>");
}
else
{
RegisterStartupScript("message","<script language='JavaScript'>alert('删除失败');</script>");
}
conn.Close();
conn.Dispose();
}
/// <summary>
/// 利用当前用户的登录名获取当前用户所在的部门编号
/// 涉及数据表:EmployeeBaseInfo
/// </summary>
/// <returns>当前用户所在的部门编号</returns>
private string GetCurrentUserDeptID()
{
string result = "";
//获取当前登录的用户的员工编号
//P.S. 如果无法得到当前用户所在的部门,请在这里Response一下,很可能就是下面的变量没有得到
string userName = ((SitePrincipal)Context.User).UserCardNum.ToString();
if (userName != string.Empty)
{
string sql = "SELECT DepID FROM EmployeeBaseInfo WHERE EmployeeNo ='" + userName + "'";
SqlConnection conn = new SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings["TedabusMIS"].ToString());
conn.Open();
SqlCommand cmd = new SqlCommand(sql, conn);
try
{
//因为只有一个字段,我用的是SqlCommand的ExecuteScalar方法
result = cmd.ExecuteScalar().ToString();
}
catch
{
result = "";
}
finally
{
cmd.Dispose();
conn.Close();
conn.Dispose();
}
}
//Response.Write("dept:" + result + " user " + userName);
return result;
}
}
补充：.NET技术 , ASP.NET
