文本框变为零(0) [英] textbox turn to zero (0)

问题描述

public double numOfP1, numOfP2, piecePr1, piecePr2, prSub1, prSub2, totalSub;

       private void multiplyButton_Click(object sender, EventArgs e)
       {
           if ((price1.Text == null) || (numOfPiece1.Text == null))
           {
               numOfP1 = Convert.ToDouble(numOfPiece1.Text);
               numOfP1 = 0;
               piecePr1 = Convert.ToDouble(price1.Text);
               piecePr1=0; 
           }
           
           if ((price2.Text == null) || (numOfPiece2.Text == null))
           {
               numOfP2 = Convert.ToDouble(numOfPiece2.Text);
               numOfP2 = 0; 
               piecePr2 = Convert.ToDouble(price2.Text);
               piecePr2 =0; 
           }                  

           prSub2 = piecePr2 * numOfP2;
           priceSub2.Text = prSub2.ToString();
           prSub1 = piecePr1 * numOfP1;
           priceSub1.Text = prSub1.ToString();
       }
   }

我将numOfP1, piecePr1, numOfP2,piecePr2转到0.它们没有作为我在这些文本框中输入的数字出现.

如何使这些文本框显示我键入的数字.

谢谢，

I got numOfP1, piecePr1, numOfP2,piecePr2 turn to 0. They are not appear as the number I enter into these textboxes.

How can I make these textboxes appear the numbers that I typed in.

thanks,

推荐答案

显然，由于您指定为"0"，因此它们变为0.仔细看毕竟，始终在调试器下运行此代码.这很简单.

顺便说一句，您原则上编码错误的方式.您倾向于将变量(成员)用于诸如numOfP1, numOfP2, piecePr1, piecePr2, prSub1, prSub2, totalSub之类的临时值.诸如此类的一切都应该是本地的.邀请您进行错误和无用的内存分配的操作.

—SA

Apparently, they turn turn 0 because you assign "0". Look thoroughly. After all, run this code under debugger, always do. It is very simple.

By the way, you are coding wrong way in principle. You tend to use variable (members) for temporary values like numOfP1, numOfP2, piecePr1, piecePr2, prSub1, prSub2, totalSub. Everything like that should be local; what you do in invitation for bugs and useless allocation of memory.

—SA

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