MVVM在构建时出现错误

Question

我刚刚创建了一个名为Tipcalc> core的PCL，我正在构建它的教程是one。这里是我的 TipViewModel.cs

using Cirrious.MvvmCross.ViewModels; 

namespace TipCalc.Core 
{ 
public class TipViewModel : MvxViewModel 
{ 
    private readonly ICalculation _calculation; 
    public TipViewModel(ICalculation calculation) 
    { 
     _calculation = calculation; 
    } 

    public override void Start() 
    { 
     _subTotal = 100; 
     _generosity = 10; 
     Recalcuate(); 
     base.Start(); 
    } 

    private double _subTotal; 

    public double SubTotal 
    { 
     get { return _subTotal; } 
     set { _subTotal = value; RaisePropertyChanged(() => SubTotal); Recalcuate(); } 
    } 

    private int _generosity; 

    public int Generosity 
    { 
     get { return _generosity; } 
     set { _generosity = value; RaisePropertyChanged(() => Generosity); Recalcuate(); } 
    } 

    private double _tip; 

    public double Tip 
    { 
     get { return _tip; } 
     set { _tip = value; RaisePropertyChanged(() => Tip); } 
    } 

    private void Recalcuate() 
    { 
     Tip = _calculation.TipAmount(SubTotal, Generosity); 
    } 
} 
} 

的问题是，当我cuild这PCL，得到以下错误：

Error 1 The type or namespace name 'ICalculation' could not be found (are you missing a using directive or an assembly reference?) 
TipCalc.Core 
Error 2 The type or namespace name 'ICalculation' could not be found (are you missing a using directive or an assembly reference?) 

Altough我的接口和类，是正确的，在服务文件夹，在项目中。

Calculation.cs

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 

namespace TipCalc.Core.Services 
{ 
public class Calculation : ICalculation 
{ 
    public double TipAmount(double subTotal, int generosity) 
    { 
     return subTotal * ((double)generosity)/100.0; 
    } 
} 
} 

而且ICalculation.cs

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 

namespace TipCalc.Core.Services 
{ 
public interface ICalculation 
{ 
    double TipAmount(double subTotal, int generosity); 
} 
} 

任何帮助吗？

Answer 1

您需要使用Calculation.cs

添加使用ICalculation.cs

使用TipCalc.Core.Services;