在GridView的动态按钮 - Button.Click事件不触发 [英] Dynamic buttons in GridView - Button.Click event not firing

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本文介绍了在GridView的动态按钮 - Button.Click事件不触发的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我必须绑定到的AccessDataSource GridView控件。选择行后，我创建所选行内的表。我添加按钮此表。他们的Click事件永远不会被解雇。我读到重新创建按钮之类的东西，但仍没有运气问题的解决。感谢您的帮助！

的.aspx：

 ＆LT;％@页面语言=C＃AutoEventWireup =真codeFILE =AdminSurvey.aspx.cs继承=AdminSurvey％GT;！＆LT; D​​OCTYPE HTML PUBLIC -  // W3C // DTD XHTML 1.0过渡// ENhttp://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd\">＆LT; HTML的xmlns =htt​​p://www.w3.org/1999/xhtml＆GT;
＆LT;头=服务器＆GT;
   ＆LT;标题＆GT;＆LT; /标题＆GT;
＆LT; /头＆GT;
＆LT;身体GT;
＆LT;表ID =form1的=服务器＆GT;
＆LT; ASP：GridView控件ID =id_survey_grid_view=服务器的DataSourceID =id_access_data_source
              SkinID =default_skinAllowSorting =真的AutoGenerateColumns =假
              OnRowCreated =SurveyGridView_RowCreated＆GT;
＆LT;柱体和GT;
        ＆LT; ASP：HyperLinkField字段的HeaderText =标题SORTEX pression =TITLE
            DataTextField =TITLEDataNavigateUrlFields =SURVEY_ID
            DataNavigateUrlFormatString =〜\\ AdminSurvey.aspx survey_id = {0}？＆GT;
        ＆LT; / ASP：HyperLinkField字段＆GT;
    ＆LT; /专栏＆GT;
＆LT; / ASP：GridView的＆GT;
＆LT; ASP：的AccessDataSource ID =id_access_data_source=服务器数据文件=〜/ App_Data文件/ database.mdb
    OldValues​​ParameterFormatString =original_ {0}
    的OnLoad =InitAccessDataSource＆GT;
＆LT; / ASP：＆的AccessDataSource GT;
＆LT; /表及GT;
＆LT; /身体GT;
＆LT; / HTML＆GT;

的.cs：

 公共部分类AdminSurvey：System.Web.UI.Page
{
 私人常量字符串ID_BUTTON_SUBMIT =SUBMIT_BUTTON;
 私人常量字符串ID_BUTTON_DELETE =SUBMIT_DELETE;
 私人字符串_selected_survey;保护无效SurveyGridView_RowCreated（对象发件人，GridViewRowEventArgs E）
{
    如果（e.Row.RowType == DataControlRowType.DataRow＆放大器;＆安培;！e.Row.DataItem = NULL＆放大器;＆安培;！的IsPostBack）
    {
        字符串调查=（（DataRowView的）e.Row.DataItem）.Row.ItemArray [0]的ToString（）;
        如果（survey.Equals（_selected_survey））
        {
            e.Row.Cells [0] .Controls.Clear（）;
            //创建表
            e.Row.Cells[0].Controls.Add(createSurveyTable(((DataRowView)e.Row.DataItem).Row.ItemArray[0].ToString(),
                                                    （（DataRowView的）e.Row.DataItem）.Row.ItemArray [1]的ToString（），
                                                    （（DataRowView的）e.Row.DataItem）.Row.ItemArray [2]的ToString（）））;            的ViewState [ROW_INDEX] = Convert.ToString（e.Row.RowIndex）;
            的ViewState [survey_id] =（（DataRowView的）e.Row.DataItem）.Row.ItemArray [0]的ToString（）;
            的ViewState [标题] =（（DataRowView的）e.Row.DataItem）.Row.ItemArray [1]的ToString（）;
            的ViewState [说明] =（（DataRowView的）e.Row.DataItem）.Row.ItemArray [2]的ToString（）;
        }
    }否则如果（e.Row.RowType == DataControlRowType.DataRow＆放大器;＆安培;！e.Row.DataItem = NULL＆放大器;＆放大器;的IsPostBack）{
        字符串row_idx =（字符串）的ViewState [ROW_INDEX];        如果（row_idx = NULL＆放大器;！＆安培; e.Row.RowIndex.Equals（Convert.ToInt32（row_idx）））
        {
            _selected_survey =（字符串）的ViewState [survey_id];
            字符串标题=（字符串）的ViewState [标题];
            字符串描述=（字符串）的ViewState [说明];            e.Row.Cells [0] .Controls.Clear（）;
            //重新创建表
            e.Row.Cells [0] .Controls.Add（createSurveyTable（_selected_survey，标题，描述））;
        }
    }
}私人表createSurveyTable（字符串survey_id，字符串名称，字符串描述）
{
    表的表=新表（）;
    连续的TableRow =新的TableRow（）;
    TableCell的细胞=新的TableCell（）;    表questions_table = createQuestionsTable（survey_id）;    cell.Controls.Add（questions_table）;    row.Cells.Add（细胞）;
    table.Rows.Add（行）;    返回表;
}私人表createQuestionsTable（字符串survey_id）
{    //提交排
    的TableRow submit_row =新的TableRow（）;
    TableCell的submit_cell =新的TableCell（）;    submit_button =新按钮（）;
    submit_button.Text =提交;
    submit_button.ID = ID_BUTTON_SUBMIT;
    submit_button.Click + =新的EventHandler（submitButton_Click）;
    submit_cell.Controls.Add（submit_button）;    delete_button =新按钮（）;
    delete_button.Text =删除;
    delete_button.ID = ID_BUTTON_DELETE;
    delete_button.Click + =新的EventHandler（deleteButton_Click）;
    submit_cell.Controls.Add（delete_button）;    submit_row.Cells.Add（submit_cell）;
    table.Rows.Add（submit_row）;    返回表;
}私人无效submitButton_Click（对象发件人，EventArgs的发送）
{
}私人无效deleteButton_Click（对象发件人，EventArgs的发送）
}} //类


解决方案

我不想回答我的问题，但我希望在看问题的时候可以节省时间的人。原来，那是错误的，如果条件：

 如果（e.Row.RowType == DataControlRowType.DataRow＆放大器;＆安培;！e.Row.DataItem = NULL＆放大器;＆安培;！的IsPostBack）
{
    // ...
}否则如果（e.Row.RowType == DataControlRowType.DataRow＆放大器;＆安培;！e.Row.DataItem = NULL＆放大器;＆放大器;的IsPostBack）{
    // ...
}

e.Row.DataItem！= NULL 被错误present在这两个条件，第二个条件，与的IsPostBack 等于真实的，从来没有执行。

正确的code是：

 如果（e.Row.RowType == DataControlRowType.DataRow＆放大器;＆安培;！e.Row.DataItem = NULL＆放大器;＆安培;！的IsPostBack）
{
    // ...
}否则如果（e.Row.RowType == DataControlRowType.DataRow＆放大器;＆放大器;的IsPostBack）
{
    // ...
}

I have a GridView control bound to an AccessDataSource. After selecting a row I'm creating a table inside the selected row. I'm adding Buttons to this table. Their Click event never gets fired. I read about recreating the buttons and stuff, but still no luck solving the issue. Thanks for help!

.aspx:

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

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
   <title></title>
</head>
<body>
<form id="form1" runat="server">
<asp:GridView ID="id_survey_grid_view" runat="server" DataSourceID="id_access_data_source"  
              SkinID="default_skin" AllowSorting="True" AutoGenerateColumns="false" 
              OnRowCreated="SurveyGridView_RowCreated">
<Columns>
        <asp:HyperLinkField HeaderText="Title" SortExpression="TITLE"
            DataTextField="TITLE" DataNavigateUrlFields="SURVEY_ID"
            DataNavigateUrlFormatString="~\AdminSurvey.aspx?survey_id={0}">
        </asp:HyperLinkField>
    </Columns>
</asp:GridView>
<asp:AccessDataSource ID="id_access_data_source" runat="server" DataFile="~/App_Data/database.mdb" 
    OldValuesParameterFormatString="original_{0}"
    OnLoad="InitAccessDataSource">
</asp:AccessDataSource>
</form>
</body>
</html>

.cs:

public partial class AdminSurvey : System.Web.UI.Page
{
 private const string ID_BUTTON_SUBMIT = "SUBMIT_BUTTON";
 private const string ID_BUTTON_DELETE = "SUBMIT_DELETE";
 private string _selected_survey;

protected void SurveyGridView_RowCreated(Object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow && e.Row.DataItem != null && !IsPostBack)
    {
        string survey = ((DataRowView)e.Row.DataItem).Row.ItemArray[0].ToString();
        if (survey.Equals(_selected_survey))
        {
            e.Row.Cells[0].Controls.Clear();
            // create table
            e.Row.Cells[0].Controls.Add(createSurveyTable(((DataRowView)e.Row.DataItem).Row.ItemArray[0].ToString(),
                                                    ((DataRowView)e.Row.DataItem).Row.ItemArray[1].ToString(),
                                                    ((DataRowView)e.Row.DataItem).Row.ItemArray[2].ToString()));

            ViewState["row_index"] = Convert.ToString(e.Row.RowIndex);
            ViewState["survey_id"] = ((DataRowView)e.Row.DataItem).Row.ItemArray[0].ToString();
            ViewState["title"] = ((DataRowView)e.Row.DataItem).Row.ItemArray[1].ToString();
            ViewState["description"] = ((DataRowView)e.Row.DataItem).Row.ItemArray[2].ToString();
        }
    } else if(e.Row.RowType == DataControlRowType.DataRow && e.Row.DataItem != null && IsPostBack) {
        string row_idx = (string)ViewState["row_index"];

        if (row_idx != null && e.Row.RowIndex.Equals(Convert.ToInt32(row_idx)))
        {
            _selected_survey = (string)ViewState["survey_id"];
            string title = (string)ViewState["title"];
            string description = (string)ViewState["description"];

            e.Row.Cells[0].Controls.Clear();
            // recreate table
            e.Row.Cells[0].Controls.Add(createSurveyTable(_selected_survey, title, description));
        }
    }
}

private Table createSurveyTable(string survey_id, string title, string description)
{
    Table table = new Table();
    TableRow row = new TableRow();
    TableCell cell = new TableCell();

    Table questions_table = createQuestionsTable(survey_id);

    cell.Controls.Add(questions_table);

    row.Cells.Add(cell);
    table.Rows.Add(row);

    return table;
}

private Table createQuestionsTable(string survey_id)
{

    // submit row
    TableRow submit_row = new TableRow();
    TableCell submit_cell = new TableCell();

    submit_button = new Button();
    submit_button.Text = "Submit";
    submit_button.ID = ID_BUTTON_SUBMIT;
    submit_button.Click += new EventHandler(submitButton_Click);
    submit_cell.Controls.Add(submit_button);

    delete_button = new Button();
    delete_button.Text = "Delete";
    delete_button.ID = ID_BUTTON_DELETE;
    delete_button.Click += new EventHandler(deleteButton_Click);
    submit_cell.Controls.Add(delete_button);

    submit_row.Cells.Add(submit_cell);
    table.Rows.Add(submit_row);

    return table;
}

private void submitButton_Click(object sender, EventArgs e)
{
}

private void deleteButton_Click(object sender, EventArgs e)
}

} // class

解决方案

I hate to answer my question, but I hope it saves anyone time when looking at the problem. It turned out, that the error was in the if conditions:

if (e.Row.RowType == DataControlRowType.DataRow && e.Row.DataItem != null && !IsPostBack)
{
    // ...
} else if (e.Row.RowType == DataControlRowType.DataRow && e.Row.DataItem != null && IsPostBack) {
    // ...
}

e.Row.DataItem != null was erroneously present in both conditions and the second condition, with IsPostBack equal to true, was never executed.

The correct code is:

if (e.Row.RowType == DataControlRowType.DataRow && e.Row.DataItem != null && !IsPostBack)
{
    // ...
} else if (e.Row.RowType == DataControlRowType.DataRow && IsPostBack)
{
    // ...
}

这篇关于在GridView的动态按钮 - Button.Click事件不触发的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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