[英]How do I stop a program from calculating if no radio button is selected?
我真的是编程新手。 C#是我上过的第一堂课,我被困在这个项目上。 我们必须创建一个程序,该程序将在选择车间单选按钮和位置单选按钮后计算车间成本。 除了一件事之外,我已经按照预期的方式进行了所有工作。
假设您选择了一个工作室,但没有选择位置。 我有一个出现MessageBox
的地方,说“选择一个位置”,但是如何阻止程序计算这种情况呢? 到目前为止,它只会计算并给出位置数量0。我需要它根本不计算。
public partial class frmWorkshopSelector : Form
{
public frmWorkshopSelector()
{
InitializeComponent();
}
private void btnExit_Click(object sender, EventArgs e)
{
this.Close(); //When clicking the exit button, the program will close
}
private void btncalc_Click(object sender, EventArgs e)
{
int wsregistration = 0;
int lcost = 0;
const decimal DAYS = 3;
//For the following if statements, depending on what workshop and location is selected,
//their correstponding registration and lodging fees will be displayed
{
if (rbtHandlingStress.Checked == true)
{
wsregistration = 1000;
}
else if (rbtSupervisionSkills.Checked == true)
{
wsregistration = 1500;
}
else if (rbtTimeManagement.Checked == true)
{
wsregistration = 800;
}
else
MessageBox.Show("Please Select a Workshop");
lblTotalCost.Text = "";
lblLodgingCost.Text = "";
lblRegistrationCost.Text = "";
}
{
if (rbtAustin.Checked == true)
{
lcost = 150;
}
else if (rbtChicago.Checked == true)
{
lcost = 225;
}
else if (rbtDallas.Checked == true)
{
lcost = 175;
}
else
{
MessageBox.Show("Please Select a Location");
lblRegistrationCost.Text = " ";
lblTotalCost.Text = " ";
lblLodgingCost.Text = " ";
}
}
lblRegistrationCost.Text = wsregistration.ToString("C");
lblLodgingCost.Text = lcost.ToString("C");
lblTotalCost.Text = (wsregistration + (lcost * DAYS)).ToString("C");
}
private void btnReset_Click(object sender, EventArgs e)
{
//unchecks all radio buttons as well as clears out the previous calculations
lblRegistrationCost.Text = "";
lblLodgingCost.Text = "";
lblTotalCost.Text = "";
rbtHandlingStress.Checked = false;
rbtSupervisionSkills.Checked = false;
rbtTimeManagement.Checked = false;
rbtAustin.Checked = false;
rbtChicago.Checked = false;
rbtDallas.Checked = false;
}
}
您必须退出该方法。 在else块中添加了return语句。
private void btncalc_Click(object sender, EventArgs e)
{
int wsregistration = 0;
int lcost = 0;
const decimal DAYS = 3;
//For the following if statements, depending on what workshop and location is selected,
//their correstponding registration and lodging fees will be displayed
if (rbtHandlingStress.Checked == true)
{
wsregistration = 1000;
}
else if (rbtSupervisionSkills.Checked == true)
{
wsregistration = 1500;
}
else if (rbtTimeManagement.Checked == true)
{
wsregistration = 800;
}
else
{
lblTotalCost.Text = "";
lblLodgingCost.Text = "";
lblRegistrationCost.Text = "";
MessageBox.Show("Please Select a Workshop");
return;
}
if (rbtAustin.Checked == true)
{
lcost = 150;
}
else if (rbtChicago.Checked == true)
{
lcost = 225;
}
else if (rbtDallas.Checked == true)
{
lcost = 175;
}
else
{
lblRegistrationCost.Text = " ";
lblTotalCost.Text = " ";
lblLodgingCost.Text = " ";
MessageBox.Show("Please Select a Location");
return;
}
lblRegistrationCost.Text = wsregistration.ToString("C");
lblLodgingCost.Text = lcost.ToString("C");
lblTotalCost.Text = (wsregistration + (lcost * DAYS)).ToString("C");
}
在函数内的任何位置编写“ return”将退出该函数,也许在显示消息框以输入位置后,键入
return;
这应该可以完成工作。
如下所示显示消息框后,只需在代码中添加return语句
public partial class frmWorkshopSelector : Form
{
public frmWorkshopSelector()
{
InitializeComponent();
}
private void btnExit_Click(object sender, EventArgs e)
{
this.Close(); //When clicking the exit button, the program will close
}
private void btncalc_Click(object sender, EventArgs e)
{
int wsregistration = 0;
int lcost = 0;
const decimal DAYS = 3;
//For the following if statements, depending on what workshop and location is selected,
//their correstponding registration and lodging fees will be displayed
{
if (rbtHandlingStress.Checked == true)
{
wsregistration = 1000;
}
else if (rbtSupervisionSkills.Checked == true)
{
wsregistration = 1500;
}
else if (rbtTimeManagement.Checked == true)
{
wsregistration = 800;
}
else
MessageBox.Show("Please Select a Workshop");
lblTotalCost.Text = "";
lblLodgingCost.Text = "";
lblRegistrationCost.Text = "";
return;
}
{
if (rbtAustin.Checked == true)
{
lcost = 150;
}
else if (rbtChicago.Checked == true)
{
lcost = 225;
}
else if (rbtDallas.Checked == true)
{
lcost = 175;
}
else
{
MessageBox.Show("Please Select a Location");
lblRegistrationCost.Text = " ";
lblTotalCost.Text = " ";
lblLodgingCost.Text = " ";
return;
}
}
lblRegistrationCost.Text = wsregistration.ToString("C");
lblLodgingCost.Text = lcost.ToString("C");
lblTotalCost.Text = (wsregistration + (lcost * DAYS)).ToString("C");
}
private void btnReset_Click(object sender, EventArgs e)
{ //uncheks all radio buttons as well as clears out the previous calculations
lblRegistrationCost.Text = "";
lblLodgingCost.Text = "";
lblTotalCost.Text = "";
rbtHandlingStress.Checked = false;
rbtSupervisionSkills.Checked = false;
rbtTimeManagement.Checked = false;
rbtAustin.Checked = false;
rbtChicago.Checked = false;
rbtDallas.Checked = false;
}
}
}
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