ConcurrentDictionary 和 Lazy<T>

如何解决ConcurrentDictionary 和 Lazy<T>

  public class SystemBase
{
    ***private ConcurrentDictionary<string,ProfitTarget> dictTP = new ConcurrentDictionary<string,ProfitTarget>();***

    private void DrawOrderLineTP(Order order,ChartControl chartControl,ChartScale chartScale,string orderId,double openProfit,double tickValue)
    {
        RectangleF rectTextOrderLabelTP = new RectangleF(vectText.X - 2,vectText.Y,tpTextLayout.Metrics.Width + 4,tpTextLayout.Metrics.Height);

        ***var newValueText = new ProfitTarget { OrderLabelRectText = rectTextOrderLabelTP };***
        if (dictTP != null && newValueText != null)
        {
            dictTP.AddOrUpdate(orderId,newValueText,(key,oldValueText) =>
            {
                if (newValueText.OrderLabelRectText != oldValueText.OrderLabelRectText)
                    oldValueText.OrderLabelRectText = newValueText.OrderLabelRectText;

                //We can draw the Rectangle based on the TextLayout used above
                if (!dictTP[orderId].IsMovingOrder && (ChartTraderdisplayStyle == ChartTraderdisplayStyle.Own || ChartTraderdisplayStyle == ChartTraderdisplayStyle.Both))
                {
                    rendertarget.FillRectangle(rectTextOrderLabelTP,tpAreaBrushDx);
                    rendertarget.DrawRectangle(rectTextOrderLabelTP,tpOutlineBrushDx,LabelOutlinewidthTP);
                    rendertarget.DrawTextLayout(vectText,tpTextLayout,tpTextBrushDx,SharpDX.Direct2D1.DrawTextOptions.NoSnap);
                }
                //return oldValueText,since it should be updated,instead of being replaced
                return oldValueText;
            });
        }
    }
}

public class ProfitTarget : IEquatable<ProfitTarget>
{
    private RectangleF orderLabelRectText;


    [CLSCompliant(false)]
    public RectangleF OrderLabelRectText { get { return orderLabelRectText; } set { orderLabelRectText = value; } }
}

我想用以下内容从上面更改字典：

private ConcurrentDictionary<string,Lazy<ProfitTarget>> dictTP = new ConcurrentDictionary<string,Lazy<ProfitTarget>>();

“RectangleF rectTextOrderLabelTP”将通过另一个类“ProfitTarget”中的属性更新，就像现在一样（AddOrUpdate）。不幸的是，我无法将传统字典转换为新的 Lazy to work，谁能帮帮我？

我想确保一切都是线程安全的，并且没有使用“锁”，这就是为什么我遇到了在网络上使用 Lazy 的可能性。 使用到目前为止的代码，有时会收到错误消息，例如：“System.NullReferenceException”或“KeyNotFoundException”。

不幸的是，我是编程新手，总是喜欢学习新东西。我非常感谢您的帮助！