小编Jak*_*son的帖子

我正在f#中做一个名为"2D形状编辑器"的项目.我之前在c#中完成了这个项目,所以我已经掌握了如何连接两个形状的所有逻辑.所以我知道我需要一个列表来保存我将要添加的所有形状.但我根本无法让我的addToList方法起作用.

我的ShapeList:

let mutable ShapeList:List<RectangleZ> =  [RectangleZ(100,100)] 

我的添加方法:

let addToList (listan:List<RectangleZ>) (element:RectangleZ) = let ShapeList =     ShapeList@[element] in ShapeList
//Method to add into the ShapeList

let addToList (listan:List<RectangleZ>) (element:RectangleZ) = element::ShapeList
//Other try on adding into shapeList

应该向ShapeList添加矩形的按钮:

btn.Click.Add(fun _ -> new RectangleZ(500, 100) |> addToList ShapeList |>ignore |> saver)
//Button click method that should be adding the RectangleZ(500, 100) to my ShapeList

当然我的矩形:

type RectangleZ(x:int, y:int)= 
  let mutable thisx = x
  let mutable thisy = y
  let mutable thiswidth …

我正在为windows phone制作一个单元转换器,但是我遇到了类继承的一些问题.

我有一个类Measurement应该是我程序中图形内容的顶级类.

public class Measurement : PhoneApplicationPage
{
    public void Convert(object give)
    {
        supervar.Comparer(this);
    }
    public WindowsPhoneControinput supervar { get; set; }
}

Measurement不包含任何图形内容,但它的子类做; 这是我遇到困难的地方.

子类:Lengthco,Weigthco并且Volumeco需要继承,Measurement但编译器说:

"Partial declarations declarations of 'Phoneapp1.Lengthco' Must not specify different base classes".

为什么会这样？