Question

我在执行以下代码时遇到问题，我正在创建一个电子邮件系统，我可以通过单击gridview中的复选框来选择多个电子邮件。一旦我选择了我想要的电子邮件并点击发送按钮，我收到以下错误

指数超出范围。必须是非负数且小于集合的大小。   参数名称：index

描述：执行当前Web请求期间发生了未处理的异常。请查看堆栈跟踪以获取有关错误及其源自代码的位置的更多信息。

异常详细信息：System.ArgumentOutOfRangeException：索引超出范围。必须是非负数且小于集合的大小。   参数名称：index

以下是我的代码任何帮助表示赞赏

protected void send_Click(object sender, EventArgs e)
{
        //Array list to hold selected email ids
        ArrayList emailArray = new ArrayList();
        //Looping through rows of GridView
        foreach (GridViewRow item in GridView1.Rows)
        {
            //Creating checkbox object using the find control method
            CheckBox cb = (CheckBox)item.Cells[1].FindControl("CheckBox1");
            //CheckBox cb = (CheckBox)item.FindControl("CheckBox1");
            //Checking whether checkbox is checked or not
            if (cb.Checked)
            {
                //If checked Adding email id to Arraylist
                emailArray.Add(GridView1.DataKeys[item.RowIndex]["email"].ToString());
            }
        }
        //Looping through the email id list
        foreach (string email in emailArray)
        {
            MailMessage msg = new MailMessage();
            msg.From = new MailAddress("siscsc3047@gmail.com");
            msg.To.Add(email);

            msg.Subject = subjecttext.Text;
            msg.Body = TextBox1.Text;
            SmtpClient smt = new SmtpClient("smtp.gmail.com", 587);
            smt.Credentials = new System.Net.NetworkCredential("siscsc3047@gmail.com", "xxxxxxxxx");
            smt.EnableSsl = true;
            smt.Send(msg);
            //}
        }
        emailsent.Text = "Email has been sent Successfully";
    }
}  

<asp:GridView ID="GridView1" runat="server" Visible="true"
    CssClass="mydatagrid" EmptyDataText="No Students Enrolled on this Module" 
    EmptyDataRowStyle-BorderWidth="0px" PagerStyle-CssClass="pager" 
    HeaderStyle-CssClass="header" RowStyle-CssClass="rows"   
    DataSourceID="displayemail">  
    <Columns>
        <asp:TemplateField>
            <ItemTemplate>
                <asp:CheckBox ID="CheckBox1" runat="server" />
            </ItemTemplate>
        </asp:TemplateField>
        <asp:BoundField DataField="email" HeaderText="email" SortExpression="name" />
    </Columns>
</asp:GridView>

Answer 1

您缺少的是设置GridView的DataKeyName属性。您的GridView应更改如下。

<asp:GridView ID="GridView1" runat="server" Visible="true"
    CssClass="mydatagrid" EmptyDataText="No Students Enrolled on this Module" 
    EmptyDataRowStyle-BorderWidth="0px" PagerStyle-CssClass="pager" 
    HeaderStyle-CssClass="header" RowStyle-CssClass="rows"   
    DataSourceID="displayemail" DataKeyNames="email">  
    <Columns>
        <asp:TemplateField>
            <ItemTemplate>
                <asp:CheckBox ID="CheckBox1" runat="server" />
            </ItemTemplate>
        </asp:TemplateField>
        <asp:BoundField DataField="email" HeaderText="email" SortExpression="name" />
    </Columns>
</asp:GridView>

ASP电子邮件客户端错误，Gridview和复选框

1 个答案: