由于似乎无法控制图例标记，因此您可能需要创建自定义图例.以下是它在 Form 和 PDF 中的外观示例:

Since there seems to be no way to control the Legend Markers you may need to create a custom Legend. Here is an example of how it may look in the Form and in a PDF:

我不得不缩小 PDF，所以它看起来更薄/更轻.

I had to zoom out the PDF, so it looks a little thinner/lighter.

这是一个返回 CustomLegend 的函数:

Here is a function that returns a CustomLegend:

Legend CustomCloneLegend(Chart chart, Legend oLeg)
{
    Legend newL = new Legend();
    newL.Position = oLeg.Position;  // copy a few settings:
    newL.Docking = oLeg.Docking;
    newL.Alignment = oLeg.Alignment;
    // a few numbers for the drawing to play with; you may want to use floats..
    int iw = 32; int iw2 = iw / 2;    int ih = 18; int ih2 = ih / 2;
    int ir = 12;  int ir2 = ir / 2;   int lw = 3;
    // we want to access the series' colors!
    chart.ApplyPaletteColors();
    foreach (Series S in chart.Series)
    {
        // the drawing code is only for linechart and markerstyles circle or square:
        Bitmap bmp = new Bitmap(iw, ih);
        using (Graphics G = Graphics.FromImage(bmp))
        using (Pen pen = new Pen(S.Color, lw))
        using (SolidBrush brush = new SolidBrush(S.Color))
        {
            G.DrawLine(pen, 0, ih2, iw, ih2);
            if (S.MarkerStyle == MarkerStyle.Circle)
                G.FillEllipse(brush, iw2 - ir2, ih2 - ir2, ir, ir);
            else if (S.MarkerStyle == MarkerStyle.Square)
                G.FillRectangle(brush, iw2 - ir2, ih2 - ir2, ir, ir);
        }
        // add a new NamesImage
        NamedImage ni = new NamedImage(S.Name, bmp);
        chart.Images.Add(ni);
        // create and add the custom legend item
        LegendItem lit = new LegendItem( S.Name, Color.Red, S.Name);
        newL.CustomItems.Add(lit);
    }
    oLeg.Enabled = false;
    return newL;
}

我是这样称呼它的:

Legend LC = CustomCloneLegend(chart3, L);
chart1.Legends.Add(LC);

一些注意事项:

• 代码使用chart.ApplyPaletteColors().这是访问 Series 颜色所必需的.
• 它还利用了鲜为人知的类NamedImage 和Chart.Images.这是必要的，因为在 Chart 中设置任何图像都需要一个字符串！
• 如果您想放大图像，您可能需要使用 LegendCells.例如见这里！
• 我只为一个 ChartType (Line) 和两个 MarkerStyles 编写了图像绘图.
• 有很多方法可以自定义这些CustomItems.有关详细信息，请参阅此处..
• 我确实使用了 Series.MarkerSize 但通过在循环内设置 ir = S.MarkerSize; 等很容易调整代码！
• 与我所做的 3 个设置相比，您可能需要从原始图例中复制一些设置到自定义图例.我刚刚注意到您设置了 Font..

• The code uses the chart.ApplyPaletteColors(). This is necessary to access the Series color.
• It also makes use of the little know classes NamedImage and Chart.Images. This is neccessary since setting any images in a Chart requires a string!
• If you want to enlarge the image you may need to use LegendCells. For an example see here!
• I have coded the image drawing only for one ChartType (Line) and only two MarkerStyles.
• There are many ways to customize those CustomItems. See here for more info..
• I did use the Series.MarkerSize but it is easy to adapt the code by setting ir = S.MarkerSize; etc inside the loop!
• You may need to copy a few more settings from your original legend to the custom legend than the 3 I did. I just noticed that you have set a Font..