Question

我正在使用SQL命令插入和删除网格，但在执行时遇到以下错误。

错误1使用未分配的本地变量＆＃39; cmd＆＃39; （这是INSERT INTO表（ID，摘要）值（＆＃39;＆＃34; +转换）错误2＆＃39; System.DateTime＆＃39;不包含＆＃39;文字＆＃39;的定义错误3＆＃39; System.EventArgs＆＃39;不包含＆＃39; CommandName＆＃39;的定义没有扩展方法＆＃39; CommandName＆＃39;接受类型＆＃39; System.EventArgs＆＃39;的第一个参数。可以找到（你错过了使用指令或汇编参考吗？）
错误4＆＃39; System.EventArgs＆＃39;不包含＆＃39; CommandArgument＆＃39;的定义没有扩展方法＆＃39; CommandArgument＆＃39;接受类型＆＃39; System.EventArgs＆＃39;的第一个参数。可以找到（你错过了使用指令或程序集引用吗？）错误5名称＆＃39; fillgrid＆＃39;在当前上下文中不存在

HTML部分是正确的。但我认为我没有正确编写插入和删除功能这是HTML代码

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
    <head id="Head1" runat="server">
        <title> </title>
    </head>

<body>

    <form id="form1" runat="server">
        <div>
            <asp:Label ID="label" runat="server">New Task</asp:Label>
            <asp:TextBox ID="textbox1" runat="server" placeHolder="Type  
            new task summary here, and click add" Width="353px">    
            </asp:TextBox>
            <asp:Button ID="button1" runat="server" OnClick="click_add" 
            Text="Add" style="margin-left: 54px" Width="67px" />
            <br />
        </div>

        <asp:GridView ID="grdStatus" runat="server" 
        OnRowCommand="grdStatus_RowCommand" AutoGenerateColumns="false">
        <Columns> 
            <asp:TemplateField HeaderText="Done?">
                <ItemTemplate>
                    <asp:CheckBox ID="checkbx" runat="server" 
                    Checked='<%#Eval("Done") %>' />
                </ItemTemplate>
            </asp:TemplateField>
            <asp:TemplateField HeaderText="ID">
                <ItemTemplate>
                    <asp:Label ID="label12" runat="server" 
                    Checked='<%#Container.DataItemIndex+1 %>'></asp:Label>
                </ItemTemplate>
            </asp:TemplateField>
            <asp:TemplateField HeaderText="Summary">
                <ItemTemplate> 
                    <asp:Label ID="label3" runat="server" 
                    Checked='<%#Eval("Summary") %>'></asp:Label>
                </ItemTemplate>
            </asp:TemplateField>
            <asp:TemplateField HeaderText="Created On">
                <ItemTemplate>
                    <asp:Label ID="label4" runat="server" 
                    Checked='<%#Eval("Date")%>' ></asp:Label>
                </ItemTemplate>
            </asp:TemplateField>
            <asp:TemplateField>
                <ItemTemplate>
                    <asp:ImageButton ID="dltButton" runat="server" 
                    ImageUrl="~/images/delete.png"   
                    CommandName="DeleteTask" Text="Delete" Width="30px" 
                    Height="30px" CommandArgument="<%#     
                    Container.DataItemIndex%>" />
                </ItemTemplate>
            </asp:TemplateField>

        </Columns>
        </asp:GridView>
    </form>
</body>
</html>

c＃代码就是这个

public partial class _Default : Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            string connectionString =    
WebConfigurationManager.ConnectionStrings["Northwind"].ConnectionString;
        string selectSQL = "SELECT * FROM Table";
            SqlConnection con = new SqlConnection(connectionString);
            SqlCommand cmd = new SqlCommand(selectSQL, con);
            SqlDataAdapter adapter = new SqlDataAdapter(cmd);
            DataSet ds = new DataSet();

            adapter.Fill(ds, "Table");

            grdStatus.DataSource = ds;
            grdStatus.DataBind();
        }
    }
    protected void click_add(object sender, EventArgs e)
    {

            string connectionString =   
  WebConfigurationManager.ConnectionStrings["Northwind"].ConnectionString;
            SqlConnection con = new SqlConnection(connectionString);
            SqlCommand cmd = new SqlCommand("INSERT INTO 
                             Table(ID,Summary) values ('" +  
            convert.ToInt32(cmd.Parameters["label2"].Value.ToString())   
            + "'" + textbox1.Text  + "'"  DateTime.Text+ "'", con);

            con.Open();
            cmd.ExecuteNonQuery();
            con.Close();


    }

    protected void grdStatus_RowCommand(object sender, EventArgs e)
    {
        if(e.CommandName == "DeleteTask")
        {
            string connectionString =    
WebConfigurationManager.ConnectionStrings["Northwind"].ConnectionString;
            SqlConnection con = new SqlConnection(connectionString);
            con.Open();
            string query = "delete from Table where id=" + 
            e.CommandArgument + "'";
            SqlCommand cmd = new SqlCommand(query, con);
            cmd.ExecuteNonQuery();
            con.Close();
            fillgrid();
        }
     }
 }

插入和删除错误Gridview ASP.NET

0 个答案: