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Hi All,
I am using AJAX Rating Control.I want half star rating.
For Example,
If My AVG Rating Count is 3 Then My Stars Wants to be show 3
If My AVG Rating Count is 2.6 Then My Stars Wants to be Show 2 1/2 mark i.e., two & half stars.But,it was not showing then also it is showing 3 stars.

My Database & My Code goes like this,

Create Table Averagerating
( 
    ID int IDENTITY(1,1) Primary Key,
    Rating Float,
    UserName Varchar(50) 
)
<style type="text/css">
        .ratingStar
        {
            font-size: 0pt;
            width: 13px;
            height: 12px;
            margin: 0px;
            padding: 0px;
            cursor: pointer;
            display: block;
            background-repeat: no-repeat;
        }
        .filledRatingStar
        {
            background-image: url(FilledStar.PNG);
        }
        .emptyRatingStar
        {
            background-image: url(EmptyStar.PNG);
        }
        .savedRatingStar
        {
            background-image: url(SavedStar.PNG);
        }
</style>
<form id="form1" runat="server">
    <AJAX:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server">
    </AJAX:ToolkitScriptManager>
    <div>
        <asp:UpdatePanel ID="pnlRating" runat="server">
            <ContentTemplate>
                <table>
                    <tr>
                        <td>
                            <asp:Label ID="lblMyRating" runat="server" Text="Average Rating" Font-Bold="true"></asp:Label>
                        </td>
                        <td>
                            <ajax:Rating ID="ArticleRating"
                                         runat="server"
                                         CurrentRating="2"
                                         MaxRating="5"
                                         StarCssClass="ratingStar"
                                         WaitingStarCssClass="savedRatingStar"
                                         FilledStarCssClass="filledRatingStar"
                                         EmptyStarCssClass="emptyRatingStar"
                                         onchanged="ArticleRating_Changed"/>
                        </td>
                        <td>
                            <asp:Label ID="lblDisplay" runat="server" Font-Bold="true"></asp:Label>
                        </td>
                    </tr>
                    </table>
            </ContentTemplate>
        </asp:UpdatePanel>
    </div>
    </form>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
using System.Data;
 
public partial class _Default : System.Web.UI.Page
{
    SqlConnection con = new SqlConnection("MyConnection");
 
    float COUNT = 0;
    float RATING = 0;
    float Result = 0;
    float MyCurrentRating = 0;
 
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            BindAverageRatingControl();
        }
    }
    public void BindAverageRatingControl()
    {
        DataTable dt = new DataTable();
        con.Open();
        SqlCommand cmd = new SqlCommand("SELECT COUNT(ID) AS NumberOfUsers,SUM(Rating) AS Total FROM Averagerating", con);
        SqlDataAdapter da = new SqlDataAdapter(cmd);
        da.Fill(dt);
 
        if (Convert.ToInt32(dt.Rows[0]["NumberOfUsers"].ToString()) != 0)
        {
            COUNT = float.Parse(dt.Rows[0]["NumberOfUsers"].ToString());
            RATING = float.Parse(dt.Rows[0]["Total"].ToString());
            Result = Convert.ToInt32(Math.Ceiling((RATING / COUNT) * 18));
            MyCurrentRating = (float)Math.Round((RATING / COUNT), 1);
            ArticleRating.CurrentRating = Convert.ToInt32(MyCurrentRating);
        }
        else
        {
            ArticleRating.CurrentRating = 0;
        }
        lblDisplay.Text = MyCurrentRating.ToString();
        ArticleRating.Style.Add("width", MyCurrentRating + "px");
    }
 
    protected void ArticleRating_Changed(object sender, AjaxControlToolkit.RatingEventArgs e)
    {
        con.Open();
        SqlCommand cmd = new SqlCommand("Insert Into Averagerating(Rating,UserName)values(@Rating,@UserName)", con);
        cmd.Parameters.AddWithValue("@Rating", ArticleRating.CurrentRating);
        cmd.Parameters.AddWithValue("@UserName", "DESAI");
        cmd.ExecuteNonQuery();
        con.Close();
        BindAverageRatingControl();
    }
}
Please Give solution for this...

Thanks in advance,
VenkiDesai.
Posted 13-Sep-12 19:56pm
Edited 13-Sep-12 20:04pm
v2
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Solution 2

You need to have different images, 5*, 4.5 * , 4*, ... etc
Then you can use a Image Label, and set it image source(url) run time, a sample could be:

Markup:
<asp:Image runat="server" ID="imgRating" AlternateText="Average rating" />

code behind:
string url = "~/images/stars{0}.gif";
           if (_value <= 1.3)
              url = string.Format(url, "10");
           else if (_value <= 1.8)
              url = string.Format(url, "15");
           else if (_value <= 2.3)
              url = string.Format(url, "20");
           else if (_value <= 2.8)
              url = string.Format(url, "25");
           else if (_value <= 3.3)
              url = string.Format(url, "30");
           else if (_value <= 3.8)
              url = string.Format(url, "35");
           else if (_value <= 4.3)
              url = string.Format(url, "40");
           else if (_value <= 4.8)
              url = string.Format(url, "45");
           else
              url = string.Format(url, "50");
           imgRating.ImageUrl = url;

see 2.5 image, we can save it as star25.png:
http://mmmjustlovely.files.wordpress.com/2012/07/2-5-stars.png[^]

Se 4.5 image, save it as star45.png
http://www.easywaystosavemoney.com.au/images/689.jpg[^]
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v4
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Solution 1

Try changing this line:
MyCurrentRating = (float)Math.Round((RATING / COUNT), 1);
to
MyCurrentRating = (float)Math.Round((RATING / COUNT),  1, MidpointRounding.AwayFromZero);

If this does not resolve, look here at the different overloads and see what works for you: MSDN: Math.Round Method [^]


BTW, strange you want to lower your rating then actual!
  Permalink  
v2

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