Question

我试图让这段代码工作，所以当数字放在长度和宽度文本框中时，它们会计算得出区域和周长。这是一个课堂作业，我的老师告诉我，我没有在输出文本框中正确显示计算结果。如果有人告诉我如何编辑我的代码以便它能正确运行，我会很高兴。谢谢。

private void btnCalculatE_Click(object sender, EventArgs e)
{
    double Length;
    double Width;
    double txtArea;
    double txtPerimeter;


    Length = Convert.ToDouble(txtLength.Text);
    Width = Convert.ToDouble(txtWidth.Text);


    txtArea = Length * Width;
    txtPerimeter = 2 * (Length + Width);


    txtArea = Convert.ToDouble(txtArea);
    txtPerimeter = Convert.ToDouble(txtPerimeter);

    txtLength.Focus();
}

private void btnExiT_Click(object sender, EventArgs e)
{
    this.Close();
}

Answer 1

我假设您使用TextBox.Text，并且您有2个名为textArea和textPerimeter的输出文本框。

private void btnCalculatE_Click(object sender, EventArgs e)
{
    double Length;
    double Width;   
    double textAreaDouble;
    double textPerimeterDouble; 

    //Length & Width now are double 
    Length = Convert.ToDouble(txtLength.Text);
    Width = Convert.ToDouble(txtWidth.Text);

    txtAreaDouble = Convert.Length * Width;
    txtPerimeterDouble = 2 * (Length + Width);

    //Set new values in your textboxes 
    textArea.Text = textAreaDouble.ToString();
    textPerimeter.Text = textPerimeterDouble.ToString(); 

    txtLength.Focus();
}

Answer 2

如果您将显示 Area 和 Perimeter 的文本框命名为txtArea和txtPerimeter，那么这就是您需要的代码：

private void btnCalculatE_Click(object sender, EventArgs e)
{
    double Length;
    double Width;

    Length = Convert.ToDouble(txtLength.Text);
    Width = Convert.ToDouble(txtWidth.Text);

    txtArea.Text = Convert.ToString(Length * Width);
    txtPerimeter.Text = Convert.ToString(2 * (Length + Width));

    //The following has nothing to do with calculating the result.
    //You may leave it if you intend to set focus to the *Length* textbox after calculating.
    txtLength.Focus();
}

希望有所帮助。

在输出文本框中正确显示计算结果

2 个答案: