我无法创建包含对象内部属性数组的对象 [英] I cannot create object that contains arrays of property inside object

问题描述

我是c#MVC3的新开发人员. 我有一个问题，我无法创建包含对象内部属性数组的对象.

I am a new developer to c# MVC3. I have a problem that I cannot create object that contains arrays of property inside object.

例如，我要为10个数组创建实例ABC.Property [].

For example, I want to create instance ABC.Property[] for 10 arrays.

ABC.Property [0]

ABC.Property[0]

ABC.Property [1]

ABC.Property[1]

ABC.Property [2] ..... .... ABC.Property [10]

ABC.Property[2] ..... .... ABC.Property[10]

我使用调试模式进行检查，发现ABC.Property []为空.因此，我无法将值添加回该对象的数组.

I used debug mode to check and found out that ABC.Property[] is null. So i cannot add the value back to that object's array.

如何使用属性数组创建对象?

How to crate object with propeties's array?

谢谢.

namespace finance3.Models
{
public class Expected_and_Risk
{


    public decimal[] Prop { get; set; }
    public decimal[] Forecast { get; set; }
    public string[] Name { get; set; }
    public decimal[] AxB { get; set; }
    public decimal[] PowAxB { get; set; }


    public decimal  ExpectValue(Expected_and_Risk abc)
    {

        decimal count = abc.Forecast.Count();

        Expected_and_Risk Result = new Expected_and_Risk();

        for (int i = 0 ; i < count ; i++)
        {
            // here is the problem
            // i cannot add new data to array because it has no dimemsion and i tried this
            //
            // Expected_and_Risk[] Result = new Expected_and_Risk[10];
            //
            // but it didn't work

            Result.Name[i] = abc.Name[i];
            Result.Prop[i] = abc.Prop[i];
            Result.Forecast[i] = abc.Forecast[i];
            Result.AxB[i] = abc.Prop[i] * abc.Forecast[i];


            decimal a = Result.AxB[i];
            decimal sumAxB =+ a;

            double temp = (double)(a * a) ;
            Result.PowAxB[i] = (decimal)(temp);

        }

        return Convert.ToDecimal(Result); 
    }
}

}

推荐答案

更好的方法是将以下方法添加到Expected_and_Risk类中，并在构造函数中调用它.

Better way could be to add following method into Expected_and_Risk class and call it from within constructor.

编辑-完成编辑后将Initialize设为私有，然后在构造函数中调用它.

EDIT - edit is done to make Initialize private, and call it within constructor.

void Initialize(int size)
{
    Prop = new decimal[size];
    AxB = new decimal[size];
    Forecast = new decimal[size];
    PowAxB = new decimal[size];
    Name = new string[size];
}

    public Expected_and_Risk(int size)
    {
      ....
      Initialize(size);
    }

然后在ExpectValue中使用它，例如

After that use it in ExpectValue like

Expected_and_Risk Result = new Expected_and_Risk(size)// size is 10 in example;

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