chartField.Series.Clear();

            chartField.ChartAreas.Clear();

            chartField.Legends.Clear();

            chartField.ChartAreas.Add(new ChartArea("Default"));

//设置图例背景色

            Legend leg = new Legend();

            leg.BackColor = Color.Transparent;

            leg.Name = "Legend1";

            chartField.Legends.Add(leg);

            chartField.BackColor = Color.FromArgb(((int)(((byte)(211)))), ((int)(((byte)(223)))), ((int)(((byte)(240)))));

            chartField.BackGradientStyle = GradientStyle.TopBottom;

            chartField.BackSecondaryColor = Color.White;

        

            foreach (string key in chartLineDic.Keys)

            {

                Series serie = new Series();

                serie.Name = key;

                serie.LegendText = key;

                serie.BorderWidth = 1;

                serie.ChartType = SeriesChartType.Line;

                serie.YValueType = ChartValueType.Int32;

                serie.XValueType = ChartValueType.DateTime;

                chartField.Series.Add(serie);

                foreach (Temp t in chartLineDic[key])

                {

                    chartField.Series[key].Points.AddXY(t.Date, t.Source);

                }

                chartField.Series[key].IsValueShownAsLabel = true;

                chartField.Series[key].LabelAngle = 10;

            }

            this.chartEventPie.Series.Clear();

            chartEventPie.ChartAreas.Clear();

            chartEventPie.Legends.Clear();

            chartEventPie.ChartAreas.Add(new ChartArea("Default"));

            chartEventPie.ChartAreas["Default"].BackColor = chartEventPie.BackColor;

            Legend legend = new Legend();

            Series series = new Series();

            legend.BackColor = chartEventPie.BackColor;

            legend.IsEquallySpacedItems = true;

            legend.IsTextAutoFit = false;

            legend.Name = "Default";

            this.chartEventPie.IsSoftShadows = false;

            if (chartEventPieDic != null)

            {

                int index = 0;

                foreach (string key in chartEventPieDic.Keys)

                {

                    DataPoint dataPoint = new DataPoint(0, chartEventPieDic[key]);

                    dataPoint.CustomProperties = "OriginalPointIndex=" + index;

                    dataPoint.LegendText = key;

                    dataPoint.IsValueShownAsLabel = false;

                    if (key == "提示")

                    {

//设置饼图颜色

                        dataPoint.Color = Color.Blue;

                    }

                    if (key == "报警")

                    {

                        dataPoint.Color = Color.Red;

                    }

                    if (key == "正常")

                    {

                        dataPoint.Color = Color.Green;

                    }

                    if (key == "预警")

                    {

                        dataPoint.Color = Color.Yellow;

                    }

                    series.Points.Add(dataPoint);

                    index++;

                }

                this.chartEventPie.Legends.Add(legend);

                series.ChartArea = "Default";

                series.ChartType = SeriesChartType.Pie;

                series.Label = "#PERCENT{P1}";

                series.Legend = "Default";

                series.XValueType = ChartValueType.Double;

                series.YValueType = ChartValueType.Double;

                this.chartEventPie.Series.Add(series);

                chartEventPie.Series[0]["CollectedColor"] = "Gray";

            }

图例显示位置

  legend.Alignment = StringAlignment.Center;

                legend.Docking = Docking.Bottom;