C# 数据绑定：“System.Data.DataRowView”不包含名为“Rating”的属性

这是我的Html标记

    <form runat="server">

  <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false" RowStyle-BackColor="#A1DCF2" Font-Names = "Arial" Font-Size = "10pt"
HeaderStyle-BackColor="#3AC0F2" HeaderStyle-ForeColor="White" DataKeyNames="FilePath" >
<Columns>
    <asp:BoundField DataField="FileName" HeaderText="FileName" />
    <asp:TemplateField>
        <ItemTemplate>
            <object type="application/x-shockwave-flash" data='dewplayer-vol.swf?mp3=<%#Eval("FilePath") %>'
                width="240" height="20" id="dewplayer">
                <param name="wmode" value="transparent" />
                <param name="movie" value='dewplayer-vol.swf?mp3=<%#Eval("FilePath") %>' />
            </object>
        </ItemTemplate>
    </asp:TemplateField>
   <asp:TemplateField ItemStyle-HorizontalAlign="Center">
                    <ItemTemplate>
                        <asp:LinkButton ID="lnkDownload" runat="server" Text="Download" OnClick="lnkDownload_Click"></asp:LinkButton>
                    </ItemTemplate>
                </asp:TemplateField><asp:TemplateField HeaderText="Song Ratings">
        <ItemTemplate>
            <asp:Rating ID="Rating1"  OnChanged="OnRatingChanged" runat="server"
                StarCssClass="Star" WaitingStarCssClass="WaitingStar" EmptyStarCssClass="Star"
                FilledStarCssClass="FilledStar" CurrentRating='<%# Eval("Rating") %>'>
            </asp:Rating>
        </ItemTemplate>
   </asp:TemplateField></Columns></asp:GridView></form>

//将用户评级插入并保存到SQL Server数据库表

    protected void OnRatingChanged(object sender, RatingEventArgs e)
    {
        int rowIndex = ((sender as Rating).NamingContainer as GridViewRow).RowIndex;
        int songId = Convert.ToInt32(GridView1.DataKeys[rowIndex].Value);
        string constr = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
        using (SqlConnection con = new SqlConnection(constr))
        {
            using (SqlCommand cmd = new SqlCommand("INSERT INTO SongRating VALUES(@SongId, @Rating)"))
            {
                cmd.CommandType = CommandType.Text;
                cmd.Parameters.AddWithValue("@SongId", songId);
                cmd.Parameters.AddWithValue("@Rating", e.Value);
                cmd.Connection = con;
                con.Open();
                cmd.ExecuteNonQuery();
                con.Close();
            }
        }
        Response.Redirect(Request.Url.AbsoluteUri);
    }



    private void BindGridviewData()
    {
        SqlConnection con = new  SqlConnection(ConfigurationManager.ConnectionStrings["constr"].ToString());
        con.Open();
        SqlCommand cmd = new SqlCommand("select * from SongTable", con);
        SqlDataAdapter da = new SqlDataAdapter(cmd);
        DataSet ds = new DataSet();
        da.Fill(ds);
        con.Close();
        GridView1.DataSource = ds;
        GridView1.DataBind();

    }

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错误发生在哪里？我是asp.net的新手谢谢你

hi@abhi你在选择列表中没有提到列评级，请执行以下操作

选择SongId，文件名，ISNULLAVGRating，0作为SongTable左侧的分级，在SongRating.SongId=SongTable.SongId组中按SongId，文件名加入SongRating

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希望这能对你有所帮助。

根据你的例外情况，上面说

当web中存在指定的数据项时，会发生上述异常 控件在返回的DataRowView的架构中不存在。在里面 也就是说，使用数据绑定指定的列 从数据库返回的数据中不存在控件

因此，在BindGridviewData方法中，可能会从此处更改Select查询

对此

  SELECT SongId, FileName, ISNULL((SELECT AVG(Rating) 
FROM SongRating WHERE SongId = SongTable.SongId), 0) as  Rating FROM SongTable

---

对不起，我不明白。请指定查询。

select * from SongTable

  SELECT SongId, FileName, ISNULL((SELECT AVG(Rating) 
FROM SongRating WHERE SongId = SongTable.SongId), 0) as  Rating FROM SongTable