Hoe kolommen van ASP.NET Kolomdiagram te spreiden over relevante intervallen van de X-as?

Zie hieronder uw originele ASPX aangepast aan uw gewenste resultaat. In principe moet u ervoor zorgen dat uw belangrijkste rasterinterval hetzelfde is als uw scorebereik en dat elke XValue het middelpunt van elk bereik zijn. Om ervoor te zorgen dat uw kolommen het gat volledig vullen, moet u de aangepaste eigenschap PointWidth=1 instellen .

ASPX:

       <asp:Chart ID="Chart2" runat="server"  BackColor="DarkSlateBlue" BackGradientStyle="LeftRight"  
       BorderlineWidth="0" Height="440px" Palette="SeaGreen" PaletteCustomColors="24, 0, 0"  
       Width="560px" BorderlineColor="128, 128, 255" OnLoad="Chart2_Load">

            <Titles>
                <asp:Title Name="DefaultTitle" Font="Trebuchet MS, 15pt, style=Bold"
                           Text = "Students per Total Score Achieved" />
            </Titles>
            <%-- <Legends>
                     <asp:Legend Name="DefaultLegend" Enabled="True" Docking="Top" />
            </Legends>--%>

            <Series>
                <asp:Series Name="Series1" YValuesPerPoint="1" CustomProperties="PointWidth=1">
                    <Points>
                        <asp:DataPoint Color="GreenYellow" XValue="15" YValues="25" />
                        <asp:DataPoint Color="255, 255, 128" XValue="25" YValues="15" />
                        <asp:DataPoint Color="0, 192, 192" XValue="35" YValues="10" />
                        <asp:DataPoint Color="Khaki" XValue="45" YValues="35" />
                    </Points>
                </asp:Series>
            </Series>
            <ChartAreas>
                <asp:ChartArea Name="ChartArea1" >
                    <AxisY Title="No of Students ">
                        <MajorGrid LineColor="DarkGray" LineDashStyle="Dot" />
                    </AxisY>
                    <AxisX Title="Score Achieved" Minimum="0" Enabled="True">
                        <MajorGrid Interval="10" IntervalOffset="Auto" IntervalOffsetType="Number" IntervalType="Number" LineColor="DarkGray" LineDashStyle="Dot" />
                        <MajorTickMark Interval="10" IntervalOffset="Auto" IntervalOffsetType="Number" IntervalType="Number" />
                    </AxisX>
                    <AxisY2>
                        <LabelStyle TruncatedLabels="True" />
                    </AxisY2>
                </asp:ChartArea>
            </ChartAreas>
        </asp:Chart>

BEWERKEN: Merk op dat de kleur voor elk punt expliciet wordt toegewezen in het aspx-bestand. U kunt hetzelfde doen in code-behind door vooraf gedefinieerde kleuren uit een verzameling te gebruiken of willekeurige kleuren te genereren, zoals deze:

Random r = new Random();
foreach (DataPoint dp in Chart2.Series[0].Points)
    dp.Color = Color.FromArgb(255, r.Next(100, 255), r.Next(100, 255), r.Next(100, 255));

BEWERK 2: Dit is precies hoe mijn code er nu uitziet:

ASPX:

   <asp:Chart ID="Chart2" runat="server"  BackColor="DarkSlateBlue" BackGradientStyle="LeftRight"  
   BorderlineWidth="0" Height="440px" Palette="SeaGreen" PaletteCustomColors="24, 0, 0"  
   Width="560px" BorderlineColor="128, 128, 255" OnLoad="Chart2_Load">

        <Titles>
            <asp:Title Name="DefaultTitle" Font="Trebuchet MS, 15pt, style=Bold"
                       Text = "Students per Total Score Achieved" />
        </Titles>
        <%-- <Legends>
                 <asp:Legend Name="DefaultLegend" Enabled="True" Docking="Top" />
        </Legends>--%>

        <Series>
            <asp:Series Name="Series1" YValuesPerPoint="1" CustomProperties="PointWidth=1">
            </asp:Series>
        </Series>
        <ChartAreas>
            <asp:ChartArea Name="ChartArea1" >
                <AxisY Title="No of Students ">
                    <MajorGrid LineColor="DarkGray" LineDashStyle="Dot" />
                </AxisY>
                <AxisX Title="Score Achieved" Minimum="0" Enabled="True">
                    <MajorGrid Interval="10" IntervalOffset="Auto" IntervalOffsetType="Number" IntervalType="Number" LineColor="DarkGray" LineDashStyle="Dot" />
                    <MajorTickMark Interval="10" IntervalOffset="Auto" IntervalOffsetType="Number" IntervalType="Number" />
                </AxisX>
                <AxisY2>
                    <LabelStyle TruncatedLabels="True" />
                </AxisY2>
            </asp:ChartArea>
        </ChartAreas>
    </asp:Chart>

CS:

protected void Chart2_Load(object sender, EventArgs e)
{
    Chart2.Visible = true;
    /*
    SqlConnection connection = new SqlConnection(ConfigurationManager.ConnectionStrings["Con"].ConnectionString);

    SqlCommand cmd = new SqlCommand();
    cmd.Connection = connection;
    cmd.CommandType = CommandType.StoredProcedure;
    cmd.CommandText = "sp_range";
    cmd.Parameters.AddWithValue("@sub_code", DropDown_Subjects.SelectedItem.Value);

    //  cmd.ExecuteNonQuery();

    connection.Open();
    SqlDataReader dr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
    */

    Chart2.DataSource = dt;

    Chart2.Series[0].XValueMember = "Score_Achieved";
    Chart2.Series[0].YValueMembers = "No_of_Students";

    Chart2.DataBind();

    Random r = new Random();
    foreach (DataPoint dp in Chart2.Series[0].Points)
        dp.Color = Color.FromArgb(255, r.Next(100, 255), r.Next(100, 255), r.Next(100, 255));

    //connection.Close();
}