GridView中的鏈接按鈕的單擊事件在網頁中不起作用？

Question

鏈接按鈕事件無法正常工作...當我單擊“參加測驗”時，鏈接按鈕測驗將在完成后在下一頁上開始，鏈接按鈕被禁用，文本將更改為“完成”，其他字段的標簽文本也會更改，例如“測驗狀態”標簽文本為“打開”，測驗后將為“關閉”，並且在“未提交”之前和“已提交”之前與“提交”狀態相同。 現在，使用linkbutton的postbackurl，單擊事件將無法進行，測驗將開始，當我返回到linkbutton頁面時，其他字段（如狀態“ Closed”）的單元格文本均未更改，並且如果我刪除了linkbutton的postbackurl並單擊它，事件工作不是針對該行而是針對整個網格。 請給我一些解決方案

****我的ASPX代碼****

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" 
BackColor="White" BorderColor="#CCCCCC" BorderStyle="None" BorderWidth="1px" 
CellPadding="3" DataKeyNames="QuizID" 
DataSourceID="SqlDataSource2" style="text-align: center" Width="800px" 
onrowdatabound="GridView1_RowDataBound1">
<Columns>
<asp:BoundField DataField="QuizID" HeaderText="QuizID" InsertVisible="False" 
ReadOnly="True" SortExpression="QuizID" />
<asp:BoundField DataField="QuizTitle" HeaderText="QuizTitle" SortExpression="QuizTitle" />
<asp:BoundField DataField="StartDate" HeaderText="StartDate"  SortExpression="StartDate" />
<asp:BoundField DataField="EndDate" HeaderText="EndDate" SortExpression="EndDate" />
<asp:BoundField DataField="TotalMarks" HeaderText="TotalMarks" SortExpression="TotalMarks" />
<asp:TemplateField HeaderText="QuizStatus" SortExpression="QuizStatus">
<ItemTemplate>
<asp:Label ID="qStatus" runat="server" Text='<%# Bind("QuizStatus") %>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="TextBox1" runat="server" Text='<%# Bind("QuizStatus") %>'></asp:TextBox>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="SubmitStatus" SortExpression="SubmitStatus">
<ItemTemplate>
<asp:Label ID="sStatus" runat="server" Text='<%# Bind("SubmitStatus") %>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="TextBox2" runat="server" Text='<%# Bind("SubmitStatus") %>'></asp:TextBox>
</EditItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField="LectureID" HeaderText="LectureID" SortExpression="LectureID" />
<asp:BoundField DataField="CourseID" HeaderText="CourseID" SortExpression="CourseID" />
<asp:TemplateField HeaderText="Start" SortExpression="Start">
<ItemTemplate>
<asp:LinkButton ID="lbStart" runat="server" CausesValidation="false" CommandName="Select" Text="Take Quiz" onclick="lbStart_Click" PostBackUrl='<%# "start.aspx?LecID="+Eval("LectureID") %>'EnableTheming="False"></asp:LinkButton>
</ItemTemplate>
</asp:TemplateField>
</Columns>
<FooterStyle BackColor="White" ForeColor="#000066" />
<HeaderStyle BackColor="#006699" Font-Bold="True" ForeColor="White" />
</asp:GridView>

<asp:SqlDataSource ID="SqlDataSource2" runat="server" ConnectionString="<%$ ConnectionStrings:ConnectionString %>" 
SelectCommand="SELECT * FROM [MQ_Quiz]"></asp:SqlDataSource>
</table>

C＃代碼

using System;
using System.Data;
using System.Data.SqlClient;
using System.Linq;
using System.Collections;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Collections.Specialized;
using System.Collections.Generic;

public partial class StudentQuiz1 : System.Web.UI.Page
{

    protected void Page_Load(object sender, EventArgs e)
    {

    }

    protected void lbStart_Click(object sender, EventArgs e)
    { 
        int i = 0;
        foreach (GridViewRow row in GridView1.Rows)
        {
            LinkButton lbtn = (LinkButton)row.FindControl("lbStart");
            if (lbtn != null)
            {
                i++;

                int QID = Convert.ToInt32(GridView1.DataKeys[row.RowIndex].Value);

                string status = "Closed";

                string con = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;

                SqlConnection connection = new SqlConnection(con);

                string qry = "UPDATE [MQ_Quiz] SET QuizStatus='" + status + "' WHERE QuizID='" + QID + "'";
                SqlCommand cmd = new SqlCommand(qry, connection);
                connection.Open();
                cmd.ExecuteNonQuery();
                connection.Close();
                GridView1.DataBind();
            }
        }
    }

    protected void GridView1_RowDataBound1(object sender, GridViewRowEventArgs e)
    {

        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            string status = DataBinder.Eval(e.Row.DataItem, "QuizStatus").ToString();
            string start = DataBinder.Eval(e.Row.DataItem, "Start").ToString();

            if (status == "Open")
            {
                Label statuslbl = (Label)e.Row.FindControl("qStatus");
                statuslbl.ForeColor = System.Drawing.Color.Green;

                LinkButton lb = (LinkButton)e.Row.FindControl("lbStart");
                lb.Visible = true;

                Label submitlbl = (Label)e.Row.FindControl("sStatus");
                submitlbl.ForeColor = System.Drawing.Color.Red;

            }
            else if (status == "Closed")
            {
                Label statuslbl = (Label)e.Row.FindControl("qStatus");
                statuslbl.ForeColor = System.Drawing.Color.Red;

                Label submitlbl = (Label)e.Row.FindControl("sStatus");
                submitlbl.Text = "Submitted";
                submitlbl.ForeColor = System.Drawing.Color.Green;


                e.Row.Cells[9].Text = "Done";
                e.Row.Cells[9].Attributes.CssStyle[HtmlTextWriterStyle.Color] = "gray";
                e.Row.Cells[9].Enabled = false;
            }
        }
    }
}

Answer 1

在您的gridview中，添加onRowCommand事件，如下所示：

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" 
BackColor="White" BorderColor="#CCCCCC" BorderStyle="None" BorderWidth="1px" 
CellPadding="3" DataKeyNames="QuizID" 
DataSourceID="SqlDataSource2" style="text-align: center" Width="800px" 
onrowdatabound="GridView1_RowDataBound1"
OnRowCommand="GridView1_RowCommand">

鏈接按鈕是這樣的：

<asp:LinkButton ID="lbStart" 
                runat="server" 
                CausesValidation="false" 
                CommandName="TakeQuiz" 
                Text="Take Quiz"
                CommandArgument='<%# Eval("LectureID") %>'
                EnableTheming="False">
                </asp:LinkButton>

在網格視圖的行按鈕中，行命令事件如下所示：

 protected void grdCustomPagging_RowCommand(object sender, GridViewCommandEventArgs e)
{
    if (e.CommandName == "TakeQuiz")
    {
        LinkButton lnkView = (LinkButton)e.CommandSource;
        string lectureId= lnkView.CommandArgument;
      // write link button click event code here
    }
}

Answer 2

從鏈接按鈕中刪除PostBackUrl屬性，鏈接的onClick事件將起作用。

<asp:LinkButton ID="lbStart" runat="server" CausesValidation="false" CommandName="Select" Text="Take Quiz" onclick="lbStart_Click" EnableTheming="False"></asp:LinkButton>

讓我知道是否有效。 :)

Answer 3

像這樣使用您的事件：

 protected void lbStart_Click(object sender, EventArgs e)
 {
        LinkButton lbtn = (LinkButton)sender;
        GridViewRow row = (GridViewRow)lbtn.NamingContainer;
        if (row != null)
        {

            int QID = Convert.ToInt32(GridView1.DataKeys[row.RowIndex].Value);
            string status = "Closed";
            string con = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
            SqlConnection connection = new SqlConnection(con);
            string qry = "UPDATE [MQ_Quiz] SET QuizStatus='" + status + "' WHERE QuizID='" + QID + "'";
            SqlCommand cmd = new SqlCommand(qry, connection);
            connection.Open();
            cmd.ExecuteNonQuery();
            connection.Close();
            GridView1.DataBind();
        }

}