windows窗体输入不断显示
本文关键字：显示 输入 窗体 windows | 更新日期: 2023-09-27 18:29:47
我一辈子都想不出如何连续显示数字的输入和输出。
如何将数字存储在某个位置，然后显示我绕了那么多圈子，把自己弄糊涂了。我知道需要做什么，但不知道如何做，也不知道具体在哪里做？
public partial class Form1 : Form
{
char c;
double num1;
double num2;
public Form1()
{
InitializeComponent();
}
private void btn0_Click(object sender, EventArgs e)
{
txtBox.Text += 0;
}
private void btn1_Click(object sender, EventArgs e)
{
txtBox.Text += 1;
}
private void btn2_Click(object sender, EventArgs e)
{
txtBox.Text += 2;
}
private void btn3_Click(object sender, EventArgs e)
{
txtBox.Text += 3;
}
private void btn4_Click(object sender, EventArgs e)
{
txtBox.Text += 4;
}
private void btn5_Click(object sender, EventArgs e)
{
txtBox.Text += 5;
}
private void btn6_Click(object sender, EventArgs e)
{
txtBox.Text += 6;
}
private void btn7_Click(object sender, EventArgs e)
{
txtBox.Text += 7;
}
private void btn8_Click(object sender, EventArgs e)
{
txtBox.Text += 8;
}
private void btn9_Click(object sender, EventArgs e)
{
txtBox.Text += 9;
}
private void btnDecimal_Click(object sender, EventArgs e)
{
if (!txtBox.Text.Contains('.'))
txtBox.Text += '.';
}
private void btnAddition_Click(object sender, EventArgs e)
{
c = '+';
num1 = double.Parse(txtBox.Text);
txtBox.Text = string.Empty;
}
private void btnSubtraction_Click(object sender, EventArgs e)
{
c = '-';
num1 = double.Parse(txtBox.Text);
txtBox.Text = string.Empty;
}
private void btnMultiplication_Click(object sender, EventArgs e)
{
c = '*';
num1 = double.Parse(txtBox.Text);
txtBox.Text = string.Empty;
}
private void btnDivision_Click(object sender, EventArgs e)
{
c = '/';
num1 = double.Parse(txtBox.Text);
txtBox.Text = string.Empty;
}
private void btnClear_Click(object sender, EventArgs e)
{
txtBox.Clear();
}
private void btnEqual_Click(object sender, EventArgs e)
{
num2 = double.Parse(txtBox.Text);
double result;
switch (c)
{
case '+':
result = num1 + num2;
txtBox.Text = result.ToString();
break;
case '-':
result = num1 - num2;
txtBox.Text = result.ToString();
break;
case '/':
if (num2 != 0)
{
result = num1 / num2;
txtBox.Text = result.ToString();
}
else
{
txtBox.Text = "You can't divide by zero... sign up for Math 100 please =)";
}
break;
case '*':
result = num1 * num2;
txtBox.Text = result.ToString();
break;
}
}
}
}
我会让你把它连接起来，但这是我拼凑的。
public partial class Form2 : Form
{
public Form2()
{
InitializeComponent();
}
private string op;
private string num1;
private string num2;
private void handleNumberButtonClick(object sender, System.EventArgs e)
{
var num = Convert.ToInt16(((Button)sender).Tag);
if (op == null)
num1 += num;
else
num2 += num;
PrintEquation(num1, op, num2);
}
private void PrintEquation(string first, string oper = null, string second = null, string equals = null, string result = null)
{
txtBox.Text = first + oper + second + equals + result;
}
private void handleOperatorButtonClick(object sender, System.EventArgs e)
{
op = ((Button)sender).Tag.ToString();
PrintEquation(num1, op);
}
private void btnDecimal_Click(object sender, EventArgs e)
{
if (op == null && !num1.Contains(".")) num1 += ".";
if (op != null && !num2.Contains(".")) num2 += ".";
this.PrintEquation(num1, op, num2);
}
private void btnClear_Click(object sender, EventArgs e)
{
txtBox.Clear();
op = null;
num1 = null;
num2 = null;
}
private void btnEqual_Click(object sender, EventArgs e)
{
double result = 0;
var first = Convert.ToDouble(num1);
var second = Convert.ToDouble(num2);
switch (op)
{
case "+":
result = first + second;
break;
case "-":
result = first - second;
break;
case "/":
if (second != 0)
{
result = first / second;
}
else
{
errorLbl.Text = "You can't divide by zero... sign up for Math 100 please =)";
}
break;
case "*":
result = first * second;
break;
}
this.PrintEquation(num1, op, num2, "=", result.ToString());
}
}
为了让你了解事情是如何结合在一起的，这是.designer.cs文件中的按钮应该是什么样子的：
this.btn0.Location = new System.Drawing.Point(12, 60);
this.btn0.Name = "btn0";
this.btn0.Size = new System.Drawing.Size(75, 23);
this.btn0.TabIndex = 1;
this.btn0.Tag = "0";
this.btn0.Text = "btn0";
this.btn0.UseVisualStyleBackColor = true;
this.btn0.Click += new System.EventHandler(this.handleNumberButtonClick);
请注意.Tag值和事件处理程序。
Operators应该是这样的（这是add，注意标签和Click Event处理程序）：
this.addButton.Location = new System.Drawing.Point(178, 60);
this.addButton.Name = "addButton";
this.addButton.Size = new System.Drawing.Size(75, 23);
this.addButton.TabIndex = 11;
this.addButton.Tag = "+";
this.addButton.Text = "add";
this.addButton.UseVisualStyleBackColor = true;
this.addButton.Click += new System.EventHandler(this.handleOperatorButtonClick);
还有小数，像这样：
this.button4.Location = new System.Drawing.Point(178, 176);
this.button4.Name = "button4";
this.button4.Size = new System.Drawing.Size(75, 23);
this.button4.TabIndex = 15;
this.button4.Tag = ".";
this.button4.Text = "decimal";
this.button4.UseVisualStyleBackColor = true;
this.button4.Click += new System.EventHandler(this.btnDecimal_Click);
哦，把这个放在你的清晰按钮定义里
this.button5.Click += new System.EventHandler(this.btnClear_Click);
特别感谢@Mark Hall和@Martin James的真知灼见