我正在尝试以格式更新gridview外的gridview记录。在编辑按钮单击时，我编写了一个事件，当它触发时，它将行数据发送到表单供用户编辑，当我单击提交/更新按钮时，gridview将其添加为新记录而不是更新原始记录。 知道我错过了什么吗？
以下是使用gridview的设计代码
<%@ Page Title="Add User" Language="C#" AutoEventWireup="true" CodeFile="adduser.aspx.cs" Inherits="_Default" %>
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="ajax" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title></title>
<link href="style.css" type="text/css" rel="Stylesheet" />
<script type="text/javascript">
function confirmDelete() {
return confirm("Do you want to delete this record?");
}
</script>
</head>
<body>
<form id="form1" runat="server">
<ajax:ToolkitScriptManager ID="toolkit1" runat="server">
</ajax:ToolkitScriptManager>
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<table border="0" align="center" cellpadding="2" cellspacing="2" class="maindiv">
<tr><!--Hidden field for EmployeeID reference-->
<td colspan="2"><asp:HiddenField ID="txtHiddenEmpID" Value="0" runat="server" /></td>
</tr>
<tr>
<td>
<span class="asterisk">*</span><asp:Label ID="name" runat="server" Text="Name"></asp:Label>
</td>
<td>
<asp:TextBox ID="txtEmpName" runat="server" CssClass="box"></asp:TextBox>
<asp:RequiredFieldValidator Display="None" ID="RequiredFieldValidator1" ErrorMessage="Name is required!"
EnableClientScript="true" SetFocusOnError="true" runat="server" ControlToValidate="txtEmpName"
CssClass="error_msg"></asp:RequiredFieldValidator>
<asp:RegularExpressionValidator ID="NameValidator" runat="server" ErrorMessage="Name can not contain numeric or special characters."
ControlToValidate="txtEmpName" ValidationExpression="^[A-Za-z ]*$" CssClass="error_msg"></asp:RegularExpressionValidator>
</td>
</tr>
<tr>
<td>
<span class="asterisk">*</span><asp:Label ID="Label1" runat="server" Text="Address"></asp:Label>
</td>
<td>
<asp:TextBox ID="addressBox" runat="server" CssClass="box"></asp:TextBox>
<asp:RequiredFieldValidator Display="None" ID="AddressValidator" ErrorMessage="Address is required!"
EnableClientScript="true" SetFocusOnError="true" runat="server" ControlToValidate="addressBox"
CssClass="error_msg"></asp:RequiredFieldValidator>
</td>
</tr>
<tr>
<td>
<span class="asterisk">*</span><asp:Label ID="Label2" runat="server" Text="DOB"></asp:Label>
</td>
<td>
<asp:TextBox ID="dobBox" runat="server" CssClass="dob_cal box" ReadOnly="false" ></asp:TextBox>
<ajax:CalendarExtender ID="CalenderExtender1" TargetControlID="dobBox" Format="dd/MM/yyyy"
runat="server">
</ajax:CalendarExtender>
<asp:RequiredFieldValidator Display="None" ID="dobValidator" ErrorMessage="DOB is required!"
EnableClientScript="true" SetFocusOnError="true" runat="server" ControlToValidate="dobBox"
CssClass="error_msg"></asp:RequiredFieldValidator>
</td>
</tr>
<tr>
<td>
<span class="asterisk">*</span><asp:Label ID="Label3" runat="server" Text="Salary"></asp:Label>
</td>
<td>
<asp:TextBox ID="salaryBox" runat="server" CssClass="box" MaxLength="8" ></asp:TextBox>
<asp:RequiredFieldValidator ID="salaryValidate" runat="server" ControlToValidate="salaryBox"
ErrorMessage="Salary is required!" Display="None" CssClass="error_msg" SetFocusOnError="true"
EnableClientScript="true"></asp:RequiredFieldValidator>
<asp:RegularExpressionValidator ID="SalaryValidator" runat="server" ErrorMessage="Salary can contain only numeric values."
Display="None" ControlToValidate="salaryBox" ValidationExpression="^[0-9]*$"
CssClass="error_msg"></asp:RegularExpressionValidator>
</td>
</tr>
<tr>
<td>
<span class="asterisk">*</span><asp:Label ID="gender" runat="server" Text="Gender"></asp:Label>
</td>
<td>
<span>
<asp:RadioButton GroupName="gendergrp" ID="gendermale" runat="server" Text="Male"
Checked="true" /></span><span style="padding-left: 5px;">
<asp:RadioButton GroupName="gendergrp" ID="genderfemale" runat="server" Text="Female"
Checked="false" /></span>
</td>
</tr>
<tr>
<td>
<div style="float: right; margin-right: -70px;">
<asp:Button ID="Button1" runat="server" CssClass="btn" Text="Save" OnClick="Button1_Click" /></div>
</td>
<td>
<div style="float: left; margin-left: 70px;">
<asp:Button ID="CancelBtn" CausesValidation="false" runat="server" CssClass="btn"
Text="Cancel" OnClick="CancelBtn_Click" />
</div>
</td>
</tr>
<tr>
<td colspan="2">
<asp:Label ID="lblError" runat="server" CssClass="error_msg"></asp:Label>
</td>
</tr>
<tr>
<td colspan="2">
<asp:ValidationSummary ID="valSum" DisplayMode="BulletList" EnableClientScript="true"
HeaderText="Error!" runat="server" CssClass="error_msg" />
</td>
</tr>
</table>
<!--div for data display-->
<div class="data_display">
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" CellPadding="4"
DataKeyNames="EmployeeID" EmptyDataText="There are no data records to display."
GridLines="Horizontal" BackColor="#CCCCCC" BorderColor="White" Font-Bold="False"
Font-Names="Arial" Font-Size="Medium" ForeColor="#666666"
AllowPaging="True" PageSize="5" PagerSettings-Mode="Numeric"
PagerSettings-Position="Bottom"
onpageindexchanging="GridView1_PageIndexChanging"
>
<Columns>
<%-- <asp:TemplateField>
<ItemTemplate>
<asp:HiddenField ID="EmpID" runat="server" Value='<%# Eval("EmployeeID") %>' />
</ItemTemplate>
</asp:TemplateField>
--%> <asp:BoundField DataField="EmployeeID" HeaderText="Employee ID"
SortExpression="EmployeeID" Visible="true" ItemStyle-HorizontalAlign="Center">
<ItemStyle HorizontalAlign="Center" />
</asp:BoundField>
<asp:BoundField DataField="EmployeeName" HeaderText="Name" SortExpression="EmployeeName"
ItemStyle-Width="130px" ItemStyle-HorizontalAlign="Center">
<ItemStyle HorizontalAlign="Center" Width="130px" />
</asp:BoundField>
<asp:BoundField DataField="DateOfBirth" HeaderText="DoB" SortExpression="DateOfBirth"
DataFormatString="{0:dd-MM-yyyy}" ItemStyle-Width="100px" ItemStyle-HorizontalAlign="Center">
<ItemStyle HorizontalAlign="Center" Width="100px" />
</asp:BoundField>
<asp:BoundField DataField="Salary" HeaderText="Salary"
SortExpression="Salary">
<ItemStyle HorizontalAlign="Center" Width="90px" />
</asp:BoundField>
<asp:BoundField DataField="Gender" HeaderText="Gender" ItemStyle-Width="90px"
ItemStyle-HorizontalAlign="Center">
<ItemStyle HorizontalAlign="Center" Width="70px" />
</asp:BoundField>
<asp:TemplateField>
<ItemTemplate>
<asp:Button ID="EditBtn" runat="server" Text="Select" CausesValidation="false" OnClick="EditBtn_Click" />
<asp:Button ID="DelBtn" runat="server" Text="Delete" CausesValidation="false" OnClick="DelBtn_Click" OnClientClick="confirmDelete()" />
</ItemTemplate>
</asp:TemplateField>
</Columns>
<EditRowStyle BackColor="#ffffff" />
<FooterStyle BackColor="#1C5E55" Font-Bold="True" ForeColor="White" />
<HeaderStyle BackColor="Gray" Font-Bold="false" ForeColor="White" />
<PagerStyle BackColor="Gray" ForeColor="White" HorizontalAlign="Center" />
<RowStyle BackColor="#E3EAEB" />
<SelectedRowStyle BackColor="#C5BBAF" Font-Bold="True" ForeColor="#333333" />
<SortedAscendingCellStyle BackColor="#F8FAFA" />
<SortedAscendingHeaderStyle BackColor="#246B61" />
<SortedDescendingCellStyle BackColor="#D4DFE1" />
<SortedDescendingHeaderStyle BackColor="#15524A" />
</asp:GridView>
<br />
<span style="font-family: Arial; font-size: small; color: Green; font-weight: bold;">
You are viewing page <%=GridView1.PageIndex + 1%> of <%=GridView1.PageCount%>
</span>
</div>
<div>
<asp:Label ID="lblMessage" runat="server"></asp:Label></div>
</ContentTemplate>
</asp:UpdatePanel>
</form>
</body>
</html>
以下是
背后的代码using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using System.Globalization;
public partial class _Default : System.Web.UI.Page
{
private SqlConnection con;
private SqlCommand cmd;
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
GetData();
}
}
protected void CancelBtn_Click(object sender, EventArgs e)
{
if (IsPostBack)
{
ClearForm();
}
}
protected void CalenderExtender1_DatePick(object sender, EventArgs e)
{
dobBox.Text = CalenderExtender1.SelectedDate.ToString();
CalenderExtender1.Visible = false;
}
protected void DatePick(object sender, EventArgs e)
{
CalenderExtender1.Visible = true;
}
protected void Button1_Click(object sender, EventArgs e)
{
try
{
string EmpName = txtEmpName.Text;
string address = addressBox.Text;
DateTime dob = Convert.ToDateTime(dobBox.Text);
decimal salary = Convert.ToDecimal(salaryBox.Text);
bool gender = (gendermale.Checked == true ? true : false);
string constr = ConfigurationManager.ConnectionStrings["EmpConstr"].ConnectionString;
con = new SqlConnection();
con.ConnectionString = constr;
con.Open();
int count=0;
if (txtHiddenEmpID.Value != "") //insert
{
string query = "Insert into Employee (EmployeeName,Address,DateOfBirth,Salary,Gender) Values(@enm,@address,@dob,@salary,@gender)";
cmd = new SqlCommand(query, con);
cmd.Parameters.AddWithValue("@enm", EmpName);
cmd.Parameters.AddWithValue("@address", address);
cmd.Parameters.AddWithValue("@dob", dob);
cmd.Parameters.AddWithValue("@salary", salary);
cmd.Parameters.AddWithValue("@gender", gender);
count = cmd.ExecuteNonQuery();
}
else
{
// update
}
if (count == 1)
{
ClearForm();
}
con.Close();
GetData();
}
catch (Exception ex)
{
lblError.Text = ex.Message;
}
}
#region Public Functions
public void ClearForm()
{
txtEmpName.Text = string.Empty;
addressBox.Text = string.Empty;
dobBox.Text = string.Empty;
salaryBox.Text = string.Empty;
lblError.Text = string.Empty;
if (genderfemale.Checked)
{
genderfemale.Checked = false;
gendermale.Checked = true;
}
else
{
gendermale.Checked = true;
}
}
private void GetData()
{
DataTable dt = new DataTable();
string constr = ConfigurationManager.ConnectionStrings["EmpConstr"].ConnectionString;
con = new SqlConnection();
con.ConnectionString = constr;
con.Open();
string query = "SELECT * from Employee Order by EmployeeID DESC";
SqlDataAdapter sqladpt = new SqlDataAdapter(query, con);
sqladpt.Fill(dt);
GridView1.DataSource = dt;
GridView1.DataBind();
con.Close();
}
#endregion
#region GridView Functions
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
if (e.Row.Cells[4].Text == "True")
{
e.Row.Cells[4].Text = "Male";
}
else
{
e.Row.Cells[4].Text = "Female";
}
}
}
#endregion
//select data to display when gridview select button is clicked
//source: www.aspdotnet-suresh.com/2011/01/how-to-delete-records-in-gridview-with.html
protected void EditBtn_Click(object sender, EventArgs e)
{
Button btn = (Button)sender;
//Get the row that contains this button
GridViewRow gvr = (GridViewRow)btn.NamingContainer;
int index = gvr.RowIndex;
string ID = GridView1.Rows[index].Cells[0].Text;
string constr = ConfigurationManager.ConnectionStrings["EmpConstr"].ConnectionString;
SqlConnection con = new SqlConnection();
string strSQL = "SELECT * from Employee where employeeid = " + Convert.ToInt32(ID);
SqlDataAdapter sqlAdpt = new SqlDataAdapter(strSQL,constr);
DataTable dt = new DataTable();
sqlAdpt.Fill(dt);
txtHiddenEmpID.Value = ID;
txtEmpName.Text = dt.Rows[0]["EmployeeName"].ToString();
addressBox.Text = dt.Rows[0]["Address"].ToString();
dobBox.Text = Convert.ToDateTime(dt.Rows[0]["DateOfBirth"].ToString()).ToString("dd/MM/yyyy");
salaryBox.Text = dt.Rows[0]["Salary"].ToString();
string gender = dt.Rows[0]["Gender"].ToString();
if (gender == "Male")
{
gendermale.Checked = true;
genderfemale.Checked = false;
}
else
{
gendermale.Checked = false;
genderfemale.Checked = true;
}
GetData();
}
//Delete record from Gridview
public string date { get; set; }
protected void DelBtn_Click(object sender, EventArgs e)
{
LinkButton lnkbtn = sender as LinkButton;
//getting particular row linkbutton
GridViewRow gvrow = lnkbtn.NamingContainer as GridViewRow;
//getting userid of particular row
int EmpID = Convert.ToInt32(GridView1.DataKeys[gvrow.RowIndex].Value.ToString());
string username = gvrow.Cells[0].Text;
con.Open();
SqlCommand cmd = new SqlCommand("Delete from Employee where EmployeeID=" + EmpID, con);
int result = cmd.ExecuteNonQuery();
con.Close();
if (result == 1)
{
GetData();
//Displaying alert message after successfully deletion of user
ScriptManager.RegisterStartupScript(this, this.GetType(), "alertmessage", "javascript:alert('" + username + " details deleted successfully')", true);
}
GetData();
}
public string Constr { get; set; }
protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e)
{
GetData();
GridView1.PageIndex = e.NewPageIndex;
GridView1.DataBind();
}
}
答案 0 :(得分：1)
你必须为它添加一个简单的查询，
IF EXISTS (SELECT column_name FROM this_table WHERE some_col = '1' )
UPDATE this_table SET column_name='2' WHERE column_name = '1'
ELSE
INSERT into this_table (column_name) values (4)
答案 1 :(得分：1)
尝试使用sql查询将以下代码更新到表
string query = "update Employee set EmployeeName=@enm,Address=@address, DateOfBirth=
@dob, Salary=@salary,Gender=@gender where EmployeeID=@EmpID"
cmd = new SqlCommand(query, con);
cmd.Parameters.AddWithValue("@EmpID", EmpID);
cmd.Parameters.AddWithValue("@enm", EmpName);
cmd.Parameters.AddWithValue("@address", address);
cmd.Parameters.AddWithValue("@dob", dob);
cmd.Parameters.AddWithValue("@salary", salary);
cmd.Parameters.AddWithValue("@gender", gender);
count = cmd.ExecuteNonQuery();
这对您有何帮助。