Question

我找到了一个动态网格视图代码，用于创建行并保存最后填充的行。

在我的代码中，我想解析droplist选择的值文本，而不是实际写入文本框。

我已经设法在文本框中解析selectedvalue文本，并且对于一行，一切都很顺利，但是当我尝试创建第二行时，所选值对于两行都变得相同。（例如：假设我有一个带有值“a，b”的ddl菜单，如果我首先选择a值，文本框将填充ok“a”值，但如果我为第二行选择b则它将是“ b”。

我将需要9个文本框，但为了空间，我制作了一个只包含1个文本框的简单版本的代码。

HTML

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="WebApplication4.WebForm1" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
        <div style="height: 337px">
            <asp:GridView ID="Gridview1" runat="server" ShowFooter="true" AutoGenerateColumns="false" OnSelectedIndexChanged="Gridview1_SelectedIndexChanged">
                <Columns>
                    <asp:BoundField DataField="RowNumber" HeaderText="Row Number" />
                    <asp:TemplateField HeaderText="Header 1">
                        <ItemTemplate>
                            <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
                        </ItemTemplate>
                    </asp:TemplateField>
                
                    <asp:TemplateField >
                        
                        <FooterStyle HorizontalAlign="Right" />
                        <FooterTemplate>
                            <asp:Button ID="ButtonAdd" runat="server" Text="Add New Row"
                                OnClick="ButtonAdd_Click" />
                        </FooterTemplate>
                    </asp:TemplateField>
                </Columns>
            </asp:GridView>


            <br />
            <asp:DropDownList ID="DropDownList1" runat="server" OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged">
        </asp:DropDownList>
            <br />
            <br />
            <br />


        </div>
    </form>
</body>
</html>

C＃代码

namespace WebApplication4
{
    public partial class WebForm1 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
        if (!Page.IsPostBack)
        {
            setInitialRow();
        }
    }




    protected void Gridview1_SelectedIndexChanged(object sender, EventArgs e)
    {

    }





    protected void ButtonAdd_Click(object sender, EventArgs e)
    {
        AddNewRowToGrid();
    }





    private void setInitialRow()
    {
        DataTable dt = new DataTable();
        DataRow dr = null;

        dt.Columns.Add(new DataColumn("RowNumber", typeof(string)));
        dt.Columns.Add(new DataColumn("Column1", typeof(string)));


        dr = dt.NewRow();
        dr["RowNumber"] = 1;
        dr["Column1"] = string.Empty;

        dt.Rows.Add(dr);


        ViewState["CurrentTable"] = dt;
        Gridview1.DataSource = dt;
        Gridview1.DataBind();
    }







    private void AddNewRowToGrid()
    {
        int rowIndex = 0;

        if (ViewState["CurrentTable"] != null)
        {
            DataTable dtCurrentTable = (DataTable)ViewState["CurrentTable"];
            DataRow drCurrentRow = null;
            if (dtCurrentTable.Rows.Count > 0)
            {
                for (int i = 1; i <= dtCurrentTable.Rows.Count; i++)
                {

                    TextBox box1 = (TextBox)Gridview1.Rows[rowIndex].Cells[1].FindControl("TextBox1");


                    drCurrentRow = dtCurrentTable.NewRow();
                    drCurrentRow["RowNumber"] = i + 1;


                    dtCurrentTable.Rows[i - 1]["Column1"] = box1.Text;



                    rowIndex++;

                }

                dtCurrentTable.Rows.Add(drCurrentRow);
                ViewState["CurrentTable"] = dtCurrentTable;

                Gridview1.DataSource = dtCurrentTable;
                Gridview1.DataBind();

            }
            else
            {
                Response.Write("Viewstate is null");
            }
            SetPreviousData();
        }
    }






    private void SetPreviousData()
    {

        int rowIndex = 0;

        if (ViewState["CurrentTable"] != null)
        {

            DataTable dt = (DataTable)ViewState["CurrentTable"];

            if (dt.Rows.Count > 0)
            {

                for (int i = 0; i < dt.Rows.Count; i++)
                {
                    TextBox box1 = (TextBox)Gridview1.Rows[rowIndex].Cells[1].FindControl("TextBox1");


                    box1.Text = dt.Rows[i]["Column1"].ToString();

                    rowIndex++;
                }
            }
        }
    }



    protected void DropDownList1_SelectedIndexChanged(object sender,   EventArgs e)
    {

    }
}

}

所以你想象我试着去

 box1.Text = DropDownList1.SelectedValue.ToString();

我尝试了查看状态，但通常我失败了。谢谢你的任何答案！

Answer 1

ASPX页面

 <asp:DropDownList ID="DropDownList1" runat="server" OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged" AutoPostBack="true">
    </asp:DropDownList>

背后的代码

protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
    {
        SetPreviousData();
        if (ViewState["CurrentTable"] != null)
        {

            DataTable dt = (DataTable)ViewState["CurrentTable"];

            if (dt.Rows.Count > 0)
            {
                TextBox box1 = (TextBox)Gridview1.Rows[(dt.Rows.Count - 1)].Cells[1].FindControl("TextBox1");
                box1.Text = DropDownList1.SelectedValue;
            }
        }
    }

您可以尝试的另一种方法是直接将下拉列表放在gridview而不是textbox中。

使用dropmenu创建asp.net GridView动态行作为文本框条目

1 个答案: