[英]asp.net GridView dynamic line creation with dropmenu as Textbox entry
我发现了一个动态的gridview代码,该代码创建行并保存您最后填充的行。
在我的代码中,我想解析下拉列表选择的值文本,而不是实际在文本框中编写文本。
我设法解析了文本框中的selectedvalue文本,对于一行来说一切都很好,但是当我尝试创建第二行时,两行的选择值都相同。 (例如:假设我有一个ddl菜单,其中如果我先选择一个值,则文本框将被填充为“ a”值,但是如果我在第二行中选择b,则它将同时为“ b”。
我将需要9个文本框,但是为了节省空间,我只编写了一个仅包含1个文本框的代码。
的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)
{
}
}
}
就像你想像的那样,我试着去
box1.Text = DropDownList1.SelectedValue.ToString();
我尝试使用视图状态,但总的来说我失败了。 谢谢你们的任何答案!
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,您可以将dropdownlist直接放置在gridview中而不是文本框中。
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