FlexChartのLegend.StyleのStrokeColorおよびFontプロパティを用いると、凡例の文字色とフォントを指定できます。



◎サンプルコード（VB）

Imports C1.Chart
Imports C1.Win.Chart

Public Class Form1
    Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        ' データテーブルの設定
        Dim dt1 As DataTable = New DataTable()
        dt1.Columns.Add(New DataColumn("ID", GetType(Integer)))
        dt1.Columns.Add(New DataColumn("個数", GetType(Integer)))
        dt1.Rows.Add(0, 10)
        dt1.Rows.Add(1, 50)
        dt1.Rows.Add(2, 30)
        dt1.Rows.Add(3, 40)
        Dim dt2 As DataTable = New DataTable()
        dt2.Columns.Add(New DataColumn("ID", GetType(Integer)))
        dt2.Columns.Add(New DataColumn("個数", GetType(Integer)))
        dt2.Rows.Add(0, 20)
        dt2.Rows.Add(1, 30)
        dt2.Rows.Add(2, 60)
        dt2.Rows.Add(3, 30)

        ' 系列へのバインド
        FlexChart1.Series.Clear()
        Dim series1 As Series = New Series()
        series1.ChartType = ChartType.LineSymbols
        series1.DataSource = dt1
        series1.BindingX = "ID"
        series1.Binding = "個数"
        series1.Name = "系列1"
        FlexChart1.Series.Add(series1)
        Dim series2 As Series = New Series()
        series2.ChartType = ChartType.LineSymbols
        series2.DataSource = dt2
        series2.BindingX = "ID"
        series2.Binding = "個数"
        series2.Name = "系列2"
        FlexChart1.Series.Add(series2)

        ' 凡例のスタイル設定
        FlexChart1.Legend.Style.Font = New Font("MS ゴシック", 10, FontStyle.Bold)  'フォント
        FlexChart1.Legend.Style.StrokeColor = Color.DarkMagenta  'ストローク色=凡例のテキストの色
    End Sub
End Class

◎サンプルコード（C#）

using C1.Chart;
using C1.Win.Chart;

namespace prj_C1FlexChart
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();

            //データテーブルの設定
            DataTable dt1 = new DataTable();
            dt1.Columns.Add(new DataColumn("ID", typeof(Int32)));
            dt1.Columns.Add(new DataColumn("個数", typeof(Int32)));
            dt1.Rows.Add(0, 10);
            dt1.Rows.Add(1, 50);
            dt1.Rows.Add(2, 30);
            dt1.Rows.Add(3, 40);
            DataTable dt2 = new DataTable();
            dt2.Columns.Add(new DataColumn("ID", typeof(Int32)));
            dt2.Columns.Add(new DataColumn("個数", typeof(Int32)));
            dt2.Rows.Add(0, 20);
            dt2.Rows.Add(1, 30);
            dt2.Rows.Add(2, 60);
            dt2.Rows.Add(3, 30);

            // 系列へのバインド
            flexChart1.Series.Clear();
            Series series1 = new Series();
            series1.ChartType = ChartType.LineSymbols;
            series1.DataSource = dt1;
            series1.BindingX = "ID";
            series1.Binding = "個数";
            series1.Name = "系列1";
            flexChart1.Series.Add(series1);
            Series series2 = new Series();
            series2.ChartType = ChartType.LineSymbols;
            series2.DataSource = dt2;
            series2.BindingX = "ID";
            series2.Binding = "個数";
            series2.Name = "系列2";
            flexChart1.Series.Add(series2);
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            // 凡例のスタイル設定
            flexChart1.Legend.Style.Font = new Font("MS ゴシック", 10, FontStyle.Italic);  //フォント
            flexChart1.Legend.Style.StrokeColor = Color.Green;  //ストローク色＝凡例のテキストの色
        }
    }
}