如何使用ajax显示比较图表

Question

我正在尝试在我的网页中显示ajax条形图。但它只显示一个值。 我的数据库包含3列（名称，信用卡，借记卡）我想在图表中显示信用卡借方值。但图表只显示一个值。如何修改下面给出的编码。谢谢。

代码：

 protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            string query = "select Name from aTable";
            DataTable dt = GetData(query);
            ddlCountries.DataSource = dt;
            ddlCountries.DataTextField = "Name";
            ddlCountries.DataValueField = "Name";
            ddlCountries.DataBind();
            ddlCountries.Items.Insert(0, new ListItem("Select", ""));
        }
    }
    private DataTable GetData(string query, SqlParameter[] prms = null)
    {
        DataTable dt = new DataTable();
        string constr = ConfigurationManager.ConnectionStrings["demoConnectionString"].ConnectionString;
        using (SqlConnection con = new SqlConnection(constr))
        {
            using (SqlCommand cmd = new SqlCommand(query))
            {
                if (prms != null)
                    cmd.Parameters.AddRange(prms);
                using (SqlDataAdapter sda = new SqlDataAdapter())
                {
                    cmd.CommandType = CommandType.Text;
                    cmd.Connection = con;
                    sda.SelectCommand = cmd;
                    sda.Fill(dt);
                }
            }
            return dt;
        }
    }
    protected void ddlCountries_SelectedIndexChanged(object sender, EventArgs e)
    {
        string query = "select Name, Debit, Credit From aTable where Name=@Name";
        SqlParameter[] prms = new SqlParameter[1];
        prms[0] = new SqlParameter("@name", SqlDbType.NVarChar);
        prms[0].Value = ddlCountries.SelectedItem.Value.ToString();
        DataTable dt = GetData(query, prms);

        string[] x = new string[dt.Rows.Count];
        decimal[] y = new decimal[dt.Rows.Count];
        for (int i = 0; i < dt.Rows.Count; i++)
        {
            x[i] = dt.Rows[i][0].ToString();
            y[i] = Convert.ToInt32(dt.Rows[i][1]);
        }
        BarChart1.Series.Add(new AjaxControlToolkit.BarChartSeries { Data = y });
        BarChart1.CategoriesAxis = string.Join(",", x);
        BarChart1.ChartTitle = string.Format("{0} -RunTimeReportChart", ddlCountries.SelectedItem.Value);
        if (x.Length > 3)
        {
            BarChart1.ChartWidth = (x.Length * 100).ToString();
        }
        BarChart1.Visible = ddlCountries.SelectedItem.Value != "";

    }

数据库：

实际输出： 下面给出的图表仅显示名称和借记值。我也希望显示信用值。请帮我。

Answer 1

喜欢的东西：

decimal[] z = new decimal[dt.Rows.Count];
z[i] = Convert.ToInt32(dt.Rows[i][2]);
BarChart1.Series.Add(new AjaxControlToolkit.BarChartSeries { Data = z });