如何修改可空類型的值？

Question

public partial class L2SEntity { 
    public void Scale(double d) { 
     if (this.Amount.HasValue) 
      this.Amount.Value *= d; 
    } 
} 

結果在以下錯誤：

Error 2 Property or indexer 'System.Nullable<double>.Value' cannot be assigned to -- it is read only 

如何更改金額的（double類型的？）值？

Answer 1

直接指定它。

public partial class L2SEntity { 
    public void Scale(double d) { 
     if (this.Amount.HasValue) { 
      this.Amount *= d; 
     } 
    } 
}