c# - 在 BAL 类逻辑方面需要帮助

Question

在我的销售明细软件中，我想计算 TotalCost、Discount、NettotalCost。从文本框中输入数量和费率后，所有值都应自动填充。在我的程序中，它能够显示 TotalCost 和 NetTotal 但不显示折扣值，它始终只显示 0。这是我的代码，请有人修改这里有什么问题....

public class SalesEntity
{
    private string custid;
    private string custname;
    private string productname;
    private int quantity;
    private float rate;
    private float total;
    private float discount;
    private float NetTotal;

    public string CUSTOMERID
    {
        get
        {
            return custid;
        }
        set
        {
            custid = value;
        }
    }
    public string CUSTOMERNAME
    {
        get
        {
            return custname;
        }
        set
        {
            custname = value;
        }
    }
    public string PRODUCTNAME
    {
        get
        {
            return productname;
        }
        set
        {
            productname = value;
        }
    }
    public int QUANTITY
    {
        get
        {
            return quantity;
        }
        set
        {
            quantity = value;
        }
    }
    public float RATE
    {
        get
        {
            return rate;
        }
        set
        {
            rate = value;
        }
    }
    public float TOTAL
    {
        get
        {
            return total;
        }
        set
        {
            total = value; ;

        }
    }
    public float DISCOUNT
    {
        get
        {
            return discount;
        }
        set
        {
            discount = value;
        }
    }
    public float NETTOTAL
    {
        get
        {            
            return NetTotal;
        }
        set
        {
            NetTotal = value;
        }
    }
}
public class SalesBALManager
{  
    public SalesEntity Compute(SalesEntity salesEntity)
    {
        salesEntity.TOTAL = salesEntity.QUANTITY * salesEntity.RATE;
        salesEntity.DISCOUNT = (10 / 100 * salesEntity.TOTAL);
        salesEntity.NETTOTAL = salesEntity.TOTAL - salesEntity.DISCOUNT;
        return salesEntity;

    }
}
protected void TxtRate_TextChanged(object sender, EventArgs e)
    {
        if (Page.IsPostBack)
        {
            SalesBALManager obj = new SalesBALManager();
            SalesEntity salesentity = new SalesEntity();

            salesentity.QUANTITY = Convert.ToInt32(TxtQuantity.Text);
            salesentity.RATE = Convert.ToInt32(TxtRate.Text);
            salesentity.CUSTOMERID = TxtCustId.Text;
            salesentity.CUSTOMERNAME = TxtCustName.Text;

            salesentity = obj.Compute(salesentity);

            TxtTotal.Text = salesentity.TOTAL.ToString();
            TxtDiscount.Text = salesentity.DISCOUNT.ToString();            
            TxtNetTotal.Text = salesentity.NETTOTAL.ToString();
        }

    }

Answer 1

你至少有两个问题。首先，您在应该使用小数的时候使用了 float ，其次，您在除 10/100 时使用了整数算术。使用整数运算时，其结果为零。我会将 float 更改为小数并指定 0.1M 而不是 10/100。我也会更加小心我的字符串格式，以便小数中的小数点数是固定的，例如，discount.ToString( "0.00")。