我有一个小问题！一旦用户从下拉列表中选择一个特定名称，我就编写了一个绑定三个网格视图的代码...在每个网格视图中，我给了一个用户编辑和更新特定行的选项gridview ..问题是页面加载时... gridview数据没有显示...但如果我点击特定行的编辑按钮..它显示数据。你们可以帮帮我吗？以下是我的代码。
using System;
using System.Data;
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 System.Data.SqlClient;
namespace Travel1.Forms
{
public partial class claimadmin : System.Web.UI.Page
{
SqlConnection conn = new SqlConnection("");
SqlDataAdapter dadapter;
DataSet dset;
string sql = "SELECT DISTINCT M_Emp_Personal.EmpName, T_TADA_tempform.req_ID FROM T_TADA_tempform INNER JOIN M_Emp_Personal ON T_TADA_tempform.EmpID = M_Emp_Personal.EmpID INNER JOIN T_TADA_claim ON T_TADA_tempform.req_ID = T_TADA_claim.req_ID";
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
Lbltoday.Text = DateTime.Now.ToString();
dadapter = new SqlDataAdapter(sql, conn);
dset = new DataSet();
dadapter.Fill(dset);
ddlname.DataSource = dset.Tables[0];
ddlname.DataTextField = "EmpName";
ddlname.DataValueField = "req_ID";
ddlname.DataBind();
ddlname.Items.Insert(0, "--Select--");
}
}
protected void ddlname_SelectedIndexChanged(object sender, EventArgs e)
{
Label3.Visible = true;
Label4.Visible = true;
txtrma.Visible = true;
txtda.Visible = true;
int empid = Convert.ToInt32(ddlname.SelectedValue);
Gridview1Bind();
Gridview2Bind();
Gridview3Bind();
}
protected void Gridview1Bind()
{
conn.Open();
SqlCommand cmd = new SqlCommand("SELECT place_arrived, arrival_date, arrival_time, distance, mode, departure_date, departure_time, amount, ticket_number, total_amount FROM T_TADA_journey_details where req_ID=@req_ID", conn);
cmd.Parameters.AddWithValue("@req_ID",ddlname.SelectedValue);
SqlDataReader dr = cmd.ExecuteReader();
GridView1.DataSource = dr;
GridView1.DataBind();
conn.Close();
}
protected void gv1Details_RowEditing(object sender, GridViewEditEventArgs e)
{
GridView1.EditIndex = e.NewEditIndex;
Gridview1Bind();
}
protected void gv1Details_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
TextBox txtplace = (TextBox)GridView1.Rows[e.RowIndex].FindControl("txtplace");
TextBox txtadate = (TextBox)GridView1.Rows[e.RowIndex].FindControl("txtadate");
TextBox txtatime = (TextBox)GridView1.Rows[e.RowIndex].FindControl("txtatime");
TextBox txtdistance = (TextBox)GridView1.Rows[e.RowIndex].FindControl("txtdistance");
TextBox txtmode = (TextBox)GridView1.Rows[e.RowIndex].FindControl("txtmode");
TextBox txtddate = (TextBox)GridView1.Rows[e.RowIndex].FindControl("txtddate");
TextBox txtdtime = (TextBox)GridView1.Rows[e.RowIndex].FindControl("txtdtime");
TextBox txtamt = (TextBox)GridView1.Rows[e.RowIndex].FindControl("txtamt");
TextBox txtticket = (TextBox)GridView1.Rows[e.RowIndex].FindControl("txtticket");
TextBox txttotamt = (TextBox)GridView1.Rows[e.RowIndex].FindControl("txttotamt");
conn.Open();
SqlCommand cmd = new SqlCommand("update T_TADA_journey_details set place_arrived='"+ txtplace.Text+"',arrival_date='"+ txtadate.Text+"',arrival_time='"+ txtatime.Text+"',distance='"+ txtdistance.Text+"', mode='"+ txtmode.Text+"',departure_date='"+ txtddate.Text+"',departure_time='"+ txtdtime.Text+"',amount='"+ txtamt.Text+"',ticket_number='"+ txtticket.Text+"', total_amount='"+ txttotamt.Text+"' where req_ID=" + ddlname.SelectedValue , conn);
cmd.ExecuteNonQuery();
conn.Close();
GridView1.EditIndex = -1;
Gridview1Bind();
}
protected void Gridview2Bind()
{
conn.Open();
SqlCommand cmd = new SqlCommand("SELECT from_place, to_place, distance, amount_paid, total_amount, total_sum_amount FROM T_TADA_RMA where req_ID=@req_ID", conn);
cmd.Parameters.AddWithValue("@req_ID", ddlname.SelectedValue);
SqlDataReader dr = cmd.ExecuteReader();
GridView2.DataSource = dr;
GridView2.DataBind();
conn.Close();
}
protected void gv2Details_RowEditing(object sender, GridViewEditEventArgs e)
{
GridView2.EditIndex = e.NewEditIndex;
Gridview2Bind();
}
protected void gv2Details_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
TextBox txt1 = (TextBox)GridView2.Rows[e.RowIndex].FindControl("txtfplace");
TextBox txt2 = (TextBox)GridView2.Rows[e.RowIndex].FindControl("txttoplace");
TextBox txt3 = (TextBox)GridView2.Rows[e.RowIndex].FindControl("txtdistance");
TextBox txt4 = (TextBox)GridView2.Rows[e.RowIndex].FindControl("txtamount_paid");
TextBox txt5 = (TextBox)GridView2.Rows[e.RowIndex].FindControl("txttotal_amount");
TextBox txt6 = (TextBox)GridView2.Rows[e.RowIndex].FindControl("txttotal_sum_amount");
conn.Open();
SqlCommand cmd1 = new SqlCommand("update T_TADA_RMA set from_place='" + txt1.Text + "',to_place='" + txt2.Text + "',distance='" + txt3.Text + "',amount_paid='" + txt4.Text + "', total_amount='" + txt5.Text + "',total_sum_amount='" + txt6.Text + "' where req_ID=" + ddlname.SelectedValue, conn);
cmd1.ExecuteNonQuery();
conn.Close();
GridView2.EditIndex = -1;
Gridview2Bind();
}
protected void Gridview3Bind()
{
conn.Open();
SqlCommand cmd = new SqlCommand("SELECT total_amount, advance_given, recieved_amount FROM final_amount_claim where req_ID=@req_ID", conn);
cmd.Parameters.AddWithValue("@req_ID",ddlname.SelectedValue);
SqlDataReader dr = cmd.ExecuteReader();
GridView3.DataSource = dr;
GridView3.DataBind();
conn.Close();
}
protected void gv3Details_RowEditing(object sender, GridViewEditEventArgs e)
{
GridView3.EditIndex = e.NewEditIndex;
Gridview3Bind();
}
protected void gv3Details_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
TextBox txt1 = (TextBox)GridView3.Rows[e.RowIndex].FindControl("txttotalamt");
TextBox txt2 = (TextBox)GridView3.Rows[e.RowIndex].FindControl("txtadvance");
TextBox txt3 = (TextBox)GridView3.Rows[e.RowIndex].FindControl("txtrecieved");
conn.Open();
SqlCommand cmd1 = new SqlCommand("update final_amount_claim set total_amount='" + txt1.Text + "',advance_given='" + txt2.Text + "',recieved_amount='" + txt3.Text + "' where req_ID=" + ddlname.SelectedValue, conn);
cmd1.ExecuteNonQuery();
conn.Close();
GridView3.EditIndex = -1;
Gridview3Bind();
}
protected void btnOK_Click(object sender, EventArgs e)
{
conn.Open();
SqlCommand cmd=new SqlCommand("Update final_amount_claim set no_da=@no_da,rate_rma=@rate_rma where req_ID=@req_ID",conn);
cmd.Parameters.AddWithValue("no_da",txtda.Text);
cmd.Parameters.AddWithValue("rate_rma",txtrma.Text);
cmd.Parameters.AddWithValue("req_ID",ddlname.SelectedValue);
cmd.ExecuteNonQuery();
lblmsg.Visible = true;
conn.Close();
}
}
}
*
以下是ASP.NET代码
*
<asp:GridView ID="GridView1" runat="server" CssClass="vutblrow" TabIndex="6" onrowediting="gv1Details_RowEditing" onrowupdating="gv1Details_RowUpdating" CellPadding="4" ForeColor="#333333" GridLines="None" Width="18%"
PagerStyle-Mode="NumericPages" HeaderStyle-BackColor="black"
HeaderStyle-ForeColor="White" Height="53px" AutoGenerateColumns="false" >
<HeaderStyle BackColor="Black" ForeColor="White"></HeaderStyle>
<PagerStyle CssClass="pgr" Height="25px" BorderStyle="Solid" />
<Columns>
<asp:TemplateField HeaderText="Place Arrived">
<EditItemTemplate>
<asp:TextBox ID="txtplace" runat="server" Text='<%#Eval("place_arrived") %>'/>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Arrival Date">
<EditItemTemplate>
<asp:TextBox ID="txtadate" runat="server" Text='<%#Eval("arrival_date") %>'/>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Arrival Time">
<EditItemTemplate>
<asp:TextBox ID="txtatime" runat="server" Text='<%#Eval("arrival_time") %>'/>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Distance">
<EditItemTemplate>
<asp:TextBox ID="txtdistance" runat="server" Text='<%#Eval("distance") %>'/>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Mode">
<EditItemTemplate>
<asp:TextBox ID="txtmode" runat="server" Text='<%#Eval("mode") %>'/>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Departure Date">
<EditItemTemplate>
<asp:TextBox ID="txtddate" runat="server" Text='<%#Eval("departure_date") %>'/>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Departure Time">
<EditItemTemplate>
<asp:TextBox ID="txtdtime" runat="server" Text='<%#Eval("departure_time") %>'/>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Amount">
<EditItemTemplate>
<asp:TextBox ID="txtamt" runat="server" Text='<%#Eval("amount") %>'/>
</EditItemTemplate>
</asp:TemplateField> <asp:TemplateField HeaderText="Ticket number">
<EditItemTemplate> <asp:TextBox ID="txtticket" runat="server" Text='<%#Eval("ticket_number") %>'/>
</EditItemTemplate>
</asp:TemplateField> <asp:TemplateField HeaderText="Total Amount">
<EditItemTemplate>
<asp:TextBox ID="txttotamt" runat="server" Text='<%#Eval("total_amount") %>'/>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField>
<ItemTemplate>
<asp:ImageButton ID="imgedit" CommandName="Edit" runat="server"ImageUrl="~/Images/edit.gif" />
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField>
<ItemTemplate>
<asp:ImageButton ID="imgupdate" CommandName="Update" runat="server" ImageUrl="~/Images/Update.gif" />
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
</td>
<tr>
<td class="style14" colspan="3">
<asp:GridView ID="GridView2" runat="server" AutoGenerateColumns="False"
CssClass="vutblrow" TabIndex="6" onrowediting="gv2Details_RowEditing" onrowupdating="gv2Details_RowUpdating"
CellPadding="4" ForeColor="#333333" GridLines="None" Width="13%"
PagerStyle-Mode="NumericPages" HeaderStyle-BackColor="black"
HeaderStyle-ForeColor="White" Height="77px" >
<HeaderStyle BackColor="Black" ForeColor="White" />
<PagerStyle CssClass="pgr" Height="25px" BorderStyle="Solid" />
<Columns>
<asp:TemplateField HeaderText="From Place">
<EditItemTemplate>
<asp:TextBox ID="txtfplace" runat="server" Text='<%#Eval("from_place") %>'/>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="To Place">
<EditItemTemplate>
<asp:TextBox ID="txttoplace" runat="server" Text='<%#Eval("to_place") %>'/>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Distance">
<EditItemTemplate>
<asp:TextBox ID="txtdistance" runat="server" Text='<%#Eval("distance") %>'/>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Amount Paid">
<EditItemTemplate>
<asp:TextBox ID="txtamount_paid" runat="server" Text='<%#Eval("amount_paid") %>'/>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Total Amount"><EditItemTemplate>
<asp:TextBox ID="txttotal_amount" runat="server" Text='<%#Eval("total_amount") %>'/>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField>
HeaderText="Sum Of Amount">
<EditItemTemplate>
<asp:TextBox ID="txttotal_sum_amount" runat="server" Text='<%#Eval("total_sum_amount") %>'/> </EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField>
<ItemTemplate>
<asp:ImageButton ID="imgedit" CommandName="Edit" runat="server" ImageUrl="~/Images/edit.gif" /></ItemTemplate>
<asp:TemplateField>
<asp:TemplateField>
<ItemTemplate>
<asp:ImageButton ID="imgupdate" CommandName="Update" runat="server" ImageUrl="~/Images/Update.gif" />
</ItemTemplate> </asp:TemplateField>
</Columns>
</asp:GridView>
</td>
<tr>
<td class="style14" colspan="3">
<asp:GridView ID="GridView3" runat="server" AutoGenerateColumns="False"
CssClass="vutblrow" TabIndex="6" onrowediting="gv3Details_RowEditing" onrowupdating="gv3Details_RowUpdating"
CellPadding="4" ForeColor="#333333" GridLines="None" Width="7%"
PagerStyle-Mode="NumericPages" HeaderStyle-BackColor="black"
HeaderStyle-ForeColor="White" Height="60px" >
<HeaderStyle BackColor="Black" ForeColor="White" />
<PagerStyle CssClass="pgr" Height="25px" BorderStyle="Solid" />
<Columns>
<asp:TemplateField HeaderText="Total Amount">
<EditItemTemplate>
<asp:TextBox ID="txttotalamt" runat="server" Text='<%#Eval("total_amount") %>'/>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Advance Given">
<EditItemTemplate>
<asp:TextBox ID="txtadvance" runat="server" Text='<%#Eval("advance_given") %>'/>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Recieved Amount">
<EditItemTemplate>
<asp:TextBox ID="txtrecieved" runat="server" Text='<%#Eval("recieved_amount") %>'/>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField>
<ItemTemplate>
<asp:ImageButton ID="imgedit" CommandName="Edit" runat="server" ImageUrl="~/Images/edit.gif" />
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField>
<ItemTemplate>
<asp:ImageButton ID="imgupdate" CommandName="Update" runat="server" ImageUrl="~/Images/Update.gif" />
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
*
答案 0 :(得分：0)
使用会话来保存绑定值，从而保护它以进行下一次刷新
Session["DTable"] = dt;
然后调用它来分配它
答案 1 :(得分：0)
在Page_Load方法中，我没有看到您执行任何数据网格绑定。在绑定下拉列表后，您可能希望显式调用ddlname_SelectedIndexChanged(null, null)。