如何从gridview文本框中读取值 [英] How do I read value from gridview textbox

问题描述

i在现有gridview中通过行数据绑定事件的代码插入文本框

Hi,

i insert textbox in existing gridview by the code below on row databound event

Quote：

TextBox tx = new TextBox（）;

tx.ID =txtStore;

tx.Attributes。添加（runat，server）;

e.Row.Cells [2] .Controls.Add（tx）;

TextBox tx = new TextBox();
tx.ID = "txtStore";
tx.Attributes.Add("runat", "server");
e.Row.Cells[2].Controls.Add(tx);

现在当我我试图找到并读取此文本框的值是提高null异常代码是 -

now when i am trying to find and read the value of this text box is raise null exception code is -

Quote：

for （int i = 0; i< GvVarientstoredetails.Rows.Count; i ++）

{

TextBox box1 =（TextBox）GvVarientstoredetails.Rows [i] .Cells [2 ] .FindControl（txtStore）;

string s = box1.Text;

}

for (int i = 0; i < GvVarientstoredetails.Rows.Count; i++)
{
TextBox box1 = (TextBox)GvVarientstoredetails.Rows[i].Cells[2].FindControl("txtStore");
string s = box1.Text;
}

我尝试了什么：



for（int i = 0; i&l吨; GvVarientstoredetails.Rows.Count; i ++）

{

TextBox box1 =（TextBox）GvVarientstoredetails.Rows [i] .Cells [2]。.FindControl（txtStore）;

string s = box1.Text;

}

string CustomerID =（（TextBox）GvVarientstoredetails.Rows [0] .FindControl（txtStore））。Text;



请指导...

What I have tried:

for (int i = 0; i < GvVarientstoredetails.Rows.Count; i++)
{
TextBox box1 = (TextBox)GvVarientstoredetails.Rows[i].Cells[2].FindControl("txtStore");
string s = box1.Text;
}
string CustomerID = ((TextBox)GvVarientstoredetails.Rows[0].FindControl("txtStore")).Text;

please guide...

推荐答案

我还没有在RowDataBound事件中看到你的整个代码所以我不知道出了什么问题。您可能希望使用RowCreated事件来确保将创建控件。这是一个简单的例子：



ASPX：

I haven't seen your whole code in RowDataBound event so I can't tell what went wrong. You might want to use the RowCreated event to ensure that the controls will be created. Here's a quick example:

ASPX:

<asp:content id="Content2" contentplaceholderid="MainContent" runat="server" xmlns:asp="#unknown">
    <asp:gridview id="GridView1" runat="server" onrowcreated="GridView1_RowCreated">
        <columns>
                <asp:templatefield>
                    <itemtemplate>
                        <asp:placeholder id="PlaceHolder1" runat="server">           </asp:placeholder>
                        </itemtemplate>
                </asp:templatefield>
         </columns>
    </asp:gridview>
    <asp:button id="Button1" runat="server" onclick="Button1_Click" text="Button" />
</asp:content>

背后的代码：

CODE BEHIND:

using System;
using System.Web.UI.WebControls;
using System.Data;
 
namespace WebFormDemo
{
    public partial class DynamicControlInGridView : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e) {
            if (!IsPostBack)
                BindGridView();
        }
 
        protected void GridView1_RowCreated(object sender, GridViewRowEventArgs e) {
            if (e.Row.RowType == DataControlRowType.DataRow) {
                TextBox tbox = new TextBox();
                tbox.ID = "TextBox1";
 
                PlaceHolder p = (PlaceHolder)e.Row.FindControl("PlaceHolder1");
                p.Controls.Add(tbox);
 
                //you could also add it to the cells collection like

                //TextBox tbox = new TextBox();
                //tbox.ID = "TextBox1";
                //e.Row.Cells[0].Controls.Add(tbox);
 
            }
        }
 
        private void BindGridView() {
            GridView1.DataSource = CreateDataSource();
            GridView1.DataBind();
        }
 
        public DataTable CreateDataSource() {
            DataTable dt = new DataTable();
            DataRow dr;
 
            dt.Columns.Add(new DataColumn("ID", typeof(string)));
            dt.Columns.Add(new DataColumn("Name", typeof(string)));
            dt.Columns.Add(new DataColumn("Lastname", typeof(string)));
 
            dr = dt.NewRow();
            //add values to each columns
            dr["ID"] = 1;
            dr["Name"] = "Vincent";
            dr["LastName"] = "Durano";
            dt.Rows.Add(dr);
            return dt;
        }
 
        protected void Button1_Click(object sender, EventArgs e) {
	    //access TextBox controls
            foreach (GridViewRow row in GridView1.Rows) {
                TextBox tbox = row.FindControl("TextBox1") as TextBox;
                if (tbox != null) {
                    Response.Write("Found TextBox!");
                }
            }
           
        }
       
    }
}

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