我更喜欢使用SkiaSharp。
让我们使用SkiaSharp做一个小的演示。首先，您可以安装SkiaSharp.Views.FormsNuGet。
这里是xaml，我们把SKCanvasView放入网格中。

<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             ...
             xmlns:skia="clr-namespace:SkiaSharp.Views.Forms;assembly=SkiaSharp.Views.Forms">

.....
<Grid>
    <Grid.RowDefinitions>
        <RowDefinition Height="100" />
        <RowDefinition Height="100" />
     </Grid.RowDefinitions>
    <skia:SKCanvasView Grid.Row="1" PaintSurface="SKCanvasView_PaintSurface" />
</Grid>

字符串
这是后面的代码，

void SKCanvasView_PaintSurface(System.Object sender, SkiaSharp.Views.Forms.SKPaintSurfaceEventArgs e)
{
    SKImageInfo info = e.Info;
    SKSurface surface = e.Surface;
    SKCanvas canvas = surface.Canvas;
    canvas.Clear();

    //Draw the polygon
    SKPath path = new SKPath();
    path.MoveTo(0.2f * info.Width, 0.1f * info.Height);
    path.LineTo(0.9f * info.Width, 0.1f * info.Height);
    path.LineTo(0.9f * info.Width, 0.9f * info.Height);
    path.LineTo(0.1f * info.Width, 0.9f * info.Height);
    path.Close();

    SKPaint fillPaint = new SKPaint
    {
        Style = SKPaintStyle.Fill,
        Color = SKColors.Gray
    };

    //Draw the text
    string str = "To sdfghuiop retyuiop sdftyguiop sertdyfuio sdtfyguio";

    SKPaint textPaint = new SKPaint
    {
        Color = SKColors.Black
    };

    // Adjust TextSize property so text is 50% of screen width
    float textWidth = textPaint.MeasureText(str);
    textPaint.TextSize = 0.5f * info.Width * textPaint.TextSize / textWidth;

    // Find the text bounds
    SKRect textBounds = new SKRect();
    textPaint.MeasureText(str, ref textBounds);
    float xText = info.Width / 2 - textBounds.MidX;
    float yText = info.Height / 2 - textBounds.MidY;

    

    // draw the polygon and text on the canvas
    canvas.DrawPath(path, fillPaint);
    canvas.DrawText(str, xText, yText, textPaint);
}

型
相关文档，
绘制多边形：Integrating Text and Graphics
绘制文本：Path Basics in SkiaSharp
您可以参考上述文档，并根据您的需求对代码进行一些调整。
这就是效果，

的数据