Question

我有一个网格视图：

Discount.aspx

   <asp:GridView ID="GridView2" runat="server" BackColor="White" 
        BorderColor="White" BorderStyle="Ridge" BorderWidth="2px" CellPadding="3" 
        CellSpacing="1" GridLines="None">
        <FooterStyle BackColor="#C6C3C6" ForeColor="Black" />
        <HeaderStyle BackColor="#4A3C8C" Font-Bold="True" ForeColor="#E7E7FF" />
        <PagerStyle BackColor="#C6C3C6" ForeColor="Black" HorizontalAlign="Right" />
        <RowStyle BackColor="#DEDFDE" ForeColor="Black" />
        <SelectedRowStyle BackColor="#9471DE" Font-Bold="True" ForeColor="White" />
        <SortedAscendingCellStyle BackColor="#F1F1F1" />
        <SortedAscendingHeaderStyle BackColor="#594B9C" />
        <SortedDescendingCellStyle BackColor="#CAC9C9" />
        <SortedDescendingHeaderStyle BackColor="#33276A" />
    </asp:GridView>

然后我通过Discount.aspx.cs

的数据集填充它

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.Configuration;
using System.Data;
using System.Data.SqlClient;

public partial class Discount : System.Web.UI.Page
{
    DataSet ds = new DataSet();
    protected void Page_Load(object sender, EventArgs e)
    {

        DBservices db2 = new DBservices();
        SqlConnection con = db2.connect("storeConnectionString"); 
        string SelectSTR = "SELECT * FROM Items";  
        SqlDataAdapter da = new SqlDataAdapter(SelectSTR, con);  


        da.Fill(ds);
        GridView2.DataSource = ds;
        GridView2.DataBind();
    }

    protected void Button1_Click(object sender, EventArgs e)
    {
        int price;
        for (int i = 0; i < GridView2.Rows.Count; i++)
        {

            if (Convert.ToInt32(ds.Tables[0].Rows[i].ItemArray[4]) > Convert.ToInt32(minamount.Text))
            {
                price = Convert.ToInt32(ds.Tables[0].Rows[i].ItemArray[2]);
                price= price*((100- Convert.ToInt32(discountrate.Text))/100);
                ds.Tables[0].Rows[i].ItemArray[4] = price;
                GridView2.DataBind();
            }
        }
    }

}

你可以看到我试图更新数据集中的价格列而不是更新gridview，但问题是gridview没有任何变化......

谢谢你，祝你有愉快的一天

Answer 1

您需要使用数据源重新绑定网格：

 GridView2.DataSource = ds; //missing

  GridView2.DataBind();

您缺少按钮点击事件中的第一行：

声明全局数据适配器;

然后改变价值后：

   da.update() // Saves Changes to database

<强> Updated2：

    SqlDataAdapter da = new SqlDataAdapter(SelectSTR, con);  

    make changes to dataset

   da.update() // save changes to database

NOte：在外面声明dataadapter，以便在两种方法中都可以访问它

Answer 2

您没有在按钮点击时指定gridview的数据源。请注意，这些更改不会更新到数据库（您的电话）。

 protected void Button1_Click(object sender, EventArgs e)
{
    int price;
    for (int i = 0; i < GridView2.Rows.Count; i++)
    {

        if (Convert.ToInt32(ds.Tables[0].Rows[i].ItemArray[4]) > Convert.ToInt32(minamount.Text))
        {
            price = Convert.ToInt32(ds.Tables[0].Rows[i].ItemArray[2]);
            price= price*((100- Convert.ToInt32(discountrate.Text))/100);
            ds.Tables[0].Rows[i].ItemArray[4] = price;
            Gridview2.DataSource=ds;
            GridView2.DataBind();
        }
    }
}

使用gridview更新数据集值

2 个答案: