如何訪問圖表以在 c# 中添加數據點

Question

我正在嘗試編寫 class 來更新圖表數據。 我已經通過 windows forms 創建了圖表，它在 Form1.cs 和 Form1.Designer.cs 中自動生成了代碼

這是我認為來自 Form1.designer.cs 的相關部分：

private void InitializeComponent()
{
    System.Windows.Forms.DataVisualization.Charting.ChartArea chartArea1 = new System.Windows.Forms.DataVisualization.Charting.ChartArea();
    System.Windows.Forms.DataVisualization.Charting.Legend legend1 = new System.Windows.Forms.DataVisualization.Charting.Legend();
    System.Windows.Forms.DataVisualization.Charting.Series series1 = new System.Windows.Forms.DataVisualization.Charting.Series();
    System.Windows.Forms.DataVisualization.Charting.DataPoint dataPoint1 = new System.Windows.Forms.DataVisualization.Charting.DataPoint(0D, 2D);
    System.Windows.Forms.DataVisualization.Charting.DataPoint dataPoint2 = new System.Windows.Forms.DataVisualization.Charting.DataPoint(0D, 3D);
    System.Windows.Forms.DataVisualization.Charting.DataPoint dataPoint3 = new System.Windows.Forms.DataVisualization.Charting.DataPoint(0D, 2D);
    System.Windows.Forms.DataVisualization.Charting.DataPoint dataPoint4 = new System.Windows.Forms.DataVisualization.Charting.DataPoint(0D, 25D);
    System.Windows.Forms.DataVisualization.Charting.DataPoint dataPoint5 = new System.Windows.Forms.DataVisualization.Charting.DataPoint(0D, 2D);
    System.Windows.Forms.DataVisualization.Charting.DataPoint dataPoint6 = new System.Windows.Forms.DataVisualization.Charting.DataPoint(0D, 3D);
    System.Windows.Forms.DataVisualization.Charting.DataPoint dataPoint7 = new System.Windows.Forms.DataVisualization.Charting.DataPoint(0D, 0D);
    this.tableLayoutPanel1 = new System.Windows.Forms.TableLayoutPanel();
    this.chart1 = new System.Windows.Forms.DataVisualization.Charting.Chart();
    this.tableLayoutPanel1.SuspendLayout();
    ((System.ComponentModel.ISupportInitialize)(this.chart1)).BeginInit();
    this.SuspendLayout();

我寫了另一個名為 UpdateGraph.cs 的 class，它有一種方法可以在圖中添加一個額外的點

namespace DataLogger
{
    class UpdateGraph
    {
        public void addGraphPoints()
        {
            chart1.Series.Points.AddXY(0, 10);   
        }
    }
}

問題是我收到消息錯誤

當前上下文中不存在名稱 chart1

因此，如果有人能解釋我如何訪問圖表來修改數據（或者我應該指的是什么），我會非常感激，因為我現在有點難過。

Answer 1

您可以嘗試以下方法：

using System.Windows.Forms.DataVisualization.Charting;

class UpdateGraph
{
    public Chart Chart1 { get; set; }

    public UpdateGRaph(Chart chart)
    {
        Chart1 = chart;
    }

    public void AddGraphPoints()
    {
        Chart1.Series.Points.AddXY(0, 10);

    }
}

Answer 2

Forms Designer將在InitializeComponent（）中創建一個本地圖表-也許有一種方法可以阻止它，但是我還沒有找到它。 訣竅是使圖表脫離您的控制層次結構。 例如，將我在Designer.cs中的圖表添加到grpStuff中：

this.grpStuff.Controls.Add(chrtStuff);

其名稱也可以在Designer.cs中找到：

chrtStuff.Name = "chartName";

所以-在我的代碼中，我通過以下方式找到圖表：

chrt = (System.Windows.Forms.DataVisualization.Charting.Chart)grpStuff.Controls("chartName");

Answer 3

chart1.Series["您的系列名稱"].Points.AddXY(0, 10); 抱歉這么快