public static Operation createOperate(string operate)
{
Operation oper = null;
switch (operate)
{
case "+":
{
oper = new OperationAdd();
break;
}
case "-":
{
oper = new OperationSub();
break;
}
case "*":
{
oper = new OperationMul();
break;
}
case "/":
{
oper = new OperationDiv();
break;
}
case "sqr":
{
oper = new OperationSqr();
break;
}
case "sqrt":
{
oper = new OperationSqrt();
break;
}
case "+/-":
{
oper = new OperationReverse();
break;
}
}
return(oper);
}
private void btnCount_Click(object sender, EventArgs e)
{
if (txtNum1.Text.Trim().Equals(string.Empty))
{
MessageBox.Show("操作数不能为空！");
this.txtNum1.Focus();
return;
}
if (txtNum2.Text.Trim().Equals(string.Empty))
{
MessageBox.Show("被操作数不能为空！");
this.txtNum2.Focus();
return;
}
try
{
string s = this.cbxSign.SelectedItem.ToString().Trim();
Operation oper = new Operation();
switch (s)
{
case "+":
oper = new OperationAdd();
break;
case "-":
oper = new OperationMinus();
break;
case "*":
oper = new OperationRide();
break;
case "/":
oper = new OperationDiv();
break;
}
oper.NumberA = double.Parse(this.txtNum1.Text.Trim());
oper.NumberB = double.Parse(this.txtNum2.Text.Trim());
this.lblResult.Text = oper.GetReault().ToString();
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
}
}
public static Operation createOperate(string operate)
{
Operation oper = null;
switch (operate)
{
case "+":
{
oper = new OperationAdd();
break;
}
case "-":
{
oper = new OperationSub();
break;
}
case "*":
{
oper = new OperationMul();
break;
}
case "/":
{
oper = new OperationDiv();
break;
}
case "sqr":
{
oper = new OperationSqr();
break;
}
case "sqrt":
{
oper = new OperationSqrt();
break;
}
case "+/-":
{
oper = new OperationReverse();
break;
}
}
return oper;
}