C# 将数据库中的smallint绑定到gridview中的ajax stars rating

我有一个简单的表格，其中存储了评论和评级，如下所示：

Create table tblReview
 (
 Id int primary key identity,
 Rating smallint,
 Review nvarchar(max),
 RegistrationId int foreign key references tblAllRegisteredBusiness(RegistrationId),
 ReviewDate DateTime not null Default GetDate()
 )

<asp:GridView ID="GridView1" runat="server" GridLines="None" AutoGenerateColumns="False" ShowHeader="False" Width="618px" OnRowDataBound="GridView1_RowDataBound">
                        <Columns>
                        <asp:TemplateField>
                        <ItemTemplate>

                            <table cellpadding="0" cellspacing="0" class="auto-style12">
                                <tr>
                                    <td class="auto-style58"></td>
                                    <td class="auto-style61">&nbsp;<ajax:Rating ID="rating2" AutoPostBack="true" runat="server" StarCssClass="ratingEmpty" WaitingStarCssClass="ratingSaved" EmptyStarCssClass="ratingEmpty" FilledStarCssClass="ratingFilled"></ajax:Rating>&nbsp;</td>
                                    <td class="auto-style59" style="vertical-align:bottom">&nbsp;<span class="auto-style11">Review by:</span><asp:Label ID="lblUser" runat="server" CssClass="auto-style11"></asp:Label>
                                        <span class="auto-style11">&nbsp;on </span>
                                        <asp:Label ID="lblDateTime" runat="server" style="font-size: small" Text="<%# Bind('ReviewDate') %>"></asp:Label>
                                    </td>
                                    <td class="auto-style60"></td>
                                </tr>
                                <tr>
                                    <td class="auto-style56">&nbsp;</td>
                                    <td class="auto-style57" colspan="2">
                                        <asp:Label ID="lblReview" runat="server" Text="<%# Bind('Review') %>"></asp:Label>
                                    </td>
                                    <td>&nbsp;</td>
                                </tr>
                                <tr>
                                    <td class="auto-style56">&nbsp;</td>
                                    <td class="auto-style57" colspan="2">&nbsp;</td>
                                    <td>&nbsp;</td>
                                </tr>
                            </table>

                        </ItemTemplate>
                        </asp:TemplateField>
                        </Columns>
                        </asp:GridView>

 <ajax:Rating ID="rating2" CurrentRating=<%# Rating %>

 protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        string CS = ConfigurationManager.ConnectionStrings["IndiaLystConnectionString"].ConnectionString;
        using (SqlConnection con = new SqlConnection(CS))
        {
            con.Open();
            SqlCommand cmd = new SqlCommand("Select Rating from tblReview where RegistrationId=@RegistrationId", con);
            cmd.Parameters.AddWithValue("@RegistrationId", lblId.Text);
            SqlDataReader rdr = cmd.ExecuteReader();
            rdr.Read();
            AjaxControlToolkit.Rating star = (AjaxControlToolkit.Rating)GridView1.FindControl("rate2");
            star.CurrentRating = Convert.ToInt32(rdr["Rating"].ToString());
        }
    }
}

我有一个gridview，它有一个AJAX stars评级控件。我所要做的就是使用基于RegistrationId的所有评论填充gridview。gridview如下所示：

Create table tblReview
 (
 Id int primary key identity,
 Rating smallint,
 Review nvarchar(max),
 RegistrationId int foreign key references tblAllRegisteredBusiness(RegistrationId),
 ReviewDate DateTime not null Default GetDate()
 )

<asp:GridView ID="GridView1" runat="server" GridLines="None" AutoGenerateColumns="False" ShowHeader="False" Width="618px" OnRowDataBound="GridView1_RowDataBound">
                        <Columns>
                        <asp:TemplateField>
                        <ItemTemplate>

                            <table cellpadding="0" cellspacing="0" class="auto-style12">
                                <tr>
                                    <td class="auto-style58"></td>
                                    <td class="auto-style61">&nbsp;<ajax:Rating ID="rating2" AutoPostBack="true" runat="server" StarCssClass="ratingEmpty" WaitingStarCssClass="ratingSaved" EmptyStarCssClass="ratingEmpty" FilledStarCssClass="ratingFilled"></ajax:Rating>&nbsp;</td>
                                    <td class="auto-style59" style="vertical-align:bottom">&nbsp;<span class="auto-style11">Review by:</span><asp:Label ID="lblUser" runat="server" CssClass="auto-style11"></asp:Label>
                                        <span class="auto-style11">&nbsp;on </span>
                                        <asp:Label ID="lblDateTime" runat="server" style="font-size: small" Text="<%# Bind('ReviewDate') %>"></asp:Label>
                                    </td>
                                    <td class="auto-style60"></td>
                                </tr>
                                <tr>
                                    <td class="auto-style56">&nbsp;</td>
                                    <td class="auto-style57" colspan="2">
                                        <asp:Label ID="lblReview" runat="server" Text="<%# Bind('Review') %>"></asp:Label>
                                    </td>
                                    <td>&nbsp;</td>
                                </tr>
                                <tr>
                                    <td class="auto-style56">&nbsp;</td>
                                    <td class="auto-style57" colspan="2">&nbsp;</td>
                                    <td>&nbsp;</td>
                                </tr>
                            </table>

                        </ItemTemplate>
                        </asp:TemplateField>
                        </Columns>
                        </asp:GridView>

 <ajax:Rating ID="rating2" CurrentRating=<%# Rating %>

 protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        string CS = ConfigurationManager.ConnectionStrings["IndiaLystConnectionString"].ConnectionString;
        using (SqlConnection con = new SqlConnection(CS))
        {
            con.Open();
            SqlCommand cmd = new SqlCommand("Select Rating from tblReview where RegistrationId=@RegistrationId", con);
            cmd.Parameters.AddWithValue("@RegistrationId", lblId.Text);
            SqlDataReader rdr = cmd.ExecuteReader();
            rdr.Read();
            AjaxControlToolkit.Rating star = (AjaxControlToolkit.Rating)GridView1.FindControl("rate2");
            star.CurrentRating = Convert.ToInt32(rdr["Rating"].ToString());
        }
    }
}

这又不起作用了。那么在这种情况下我该怎么办呢？我原以为这很简单，但事实证明这是一项艰巨的任务。

你可以试试这句话

<ajax:Rating ID="rating2" CurrentRating=<%# Bind('Rating') %>

---

试试这个，肯定有用

<cc1:Rating ID="rtUserRating" ReadOnly="true" runat="server" 
StarCssClass="Star" WaitingStarCssClass="WaitingStar" CurrentRating=**'
<%# Convert.ToInt16(Eval("Rating")) %>

'** EmptyStarCssClass="Star" FilledStarCssClass="FilledStar">
</cc1:Rating>

---

希望您能从上面的代码中得到参考

它仍然说“指定的强制转换无效”。star.CurrentRating=Convert.ToInt32DataBinder.Evale.Row.DataItem，Rating；您可以在调试模式下检查DataBinder.Evale.Row.DataItem的值是多少吗，评级？我真的很不好意思告诉你，我从来没有使用过调试模式，这意味着我对它一无所知。你有教程或好的视频，我可以学习如何使用调试模式和断点测试代码吗？我刚刚做了，它看起来是空的。