GridView中的动态按钮-Button.Click事件未触发

Question

我有一个绑定到AccessDataSource的GridView控件。 选择一行后，我将在所选行中创建一个表。 我要在此表中添加按钮。 他们的Click事件永远不会被解雇。 我读到有关重新创建按钮和内容的信息，但仍然无法解决问题。 感谢帮助！

.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

Answer 1

我不愿回答我的问题，但我希望它可以节省任何人查看问题的时间。 原来，错误在于if条件：

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在两个条件中均错误地存在，并且从未执行过第二个条件（ IsPostBack等于true）。

正确的代码是：

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

Answer 2

尝试分配命令名称，并附加到网格的RowCommand事件以监听按钮的单击，以替代点击事件。