Question

public partial class Form1: Form {
    // Define a few variables
    int InputInteger;
    int HoldInteger;
    int OutputInteger;

    public Form1() {
        InitializeComponent();
    }

    private void exitBtn_Click(object sender, EventArgs e) {
        //Used to close the form when exit is clicked
        this.Close();
    }

    private void clearBtn_Click(object sender, EventArgs e) {
        //this will deselect all of the radio buttons, along with clearing the 
        // textboxes with input and output information.
        depositBtn.Checked = false;
        checksBtn.Checked = false;
        serviceBtn.Checked = false;
        inputTxt.Clear();
        outputTxt.Clear();
    }

    private void calculateBtn_Click(object sender, EventArgs e) {

        // Calculate button actions
        try {
            InputInteger = Convert.ToInt32(inputTxt.Text);
            // For each radio button checked gives an action to the calculate button
            if (depositBtn.Checked == true); {
                OutputInteger = (InputInteger + HoldInteger);
                outputTxt.Text = OutputInteger.ToString();

            } else if (checksBtn.Checked == true); {
                if (InputInteger > OutputInteger); {
                    OutputInteger = (HoldInteger - 10);
                    outputTxt.Text = OutputInteger.ToString();
                    MessageBox.Show("Insufficient Funds");
                    if (HoldInteger < 0); {
                        MessageBox.Show("Negative account balance");
                    }
                } else if (InputInteger <= HoldInteger); {
                    OutputInteger = (InputInteger - HoldInteger);
                    outputTxt.Text = OutputInteger.ToString();

                }
            } else if (serviceBtn.Checked); {
                if (InputInteger > OutputInteger); {
                    OutputInteger = (HoldInteger - 10);
                    outputTxt.Text = OutputInteger.ToString();
                    MessageBox.Show("Insufficient Funds");
                    if (HoldInteger < 0); {
                        MessageBox.Show("Negative account balance");
                    }
                } else if (InputInteger <= HoldInteger); {
                    OutputInteger = (InputInteger - HoldInteger);
                    outputTxt.Text = OutputInteger.ToString();

                }
            }
        } catch {

        }

    }

    private void outputTxt_TextChanged(object sender, EventArgs e) {

    }
}
}

我的read-only outputTxt文本框中没有任何文本。任何帮助表示赞赏。我需要在Calculate按钮的每次单击事件后显示outputTxt。我使用HoldInteger来保存outputinteger的中间计算，这应该是每个单选按钮选择的最终输出。My form

Answer 1

您需要从每个;语句的末尾删除if。

更改

if (depositBtn.Checked == true) ;

到

if (depositBtn.Checked == true)

在;声明之后使用if的所有地方都这样做。

这是因为如果您在;语句之后使用if，那么您实际上是在添加一个空脚本块。这些代码基本相同：

// this code block
if (depositBtn.Checked == true); 
{
    OutputInteger = (InputInteger + HoldInteger);
    outputTxt.Text = OutputInteger.ToString();
} 

//is identical to
if (depositBtn.Checked == true)
{
}
{
    OutputInteger = (InputInteger + HoldInteger);
    outputTxt.Text = OutputInteger.ToString();
}

Answer 2

一切都很好，除了;在if(condition);之后移除所有 ;就在条件陈述之后。写得像if(condition){} 那你很高兴。

C＃程序不显示输出值

2 个答案: