根据复选框更改变量 [英] Change a variable based on checkboxes

问题描述

我有一个计算饮料价格的程序。我有三个复选框，每个复选框都有一个0.25美分的成分供客户选择添加。



如何为每个复选框的小计添加.25被选中了？ （请记住，我需要在变量中保留额外金额，而不是仅为每个复选框添加.25。



我该怎么做用单选按钮？我还有3个单选按钮，每个按钮的数量都会改变小计。



谢谢。



我尝试了什么：



一个非常蹩脚的if / else语句将变量addOns更改为addOns = 0 + .25但它无法正常工作。

I have a program that calculates the price of a drink. I have three check boxes, each with a $.25 cent ingredient that the customer can choose to add.

How do I add .25 to the subtotal for each checkbox that is selected? (Keep in mind, I need to hold the "extras" amount in a variable rather than just tacking on .25 for each check box.

How do I do this with radio buttons? I also have 3 radio buttons, each with an amount that alters the subtotal.

Thanks.

What I have tried:

A really lame if/else statement that changed the variable "addOns" to "addOns = 0 + .25" but it didn't work correctly.

推荐答案

.25美分成分，客户可以选择添加。



如何将.25添加到所选的每个复选框的小计中？（请记住，我需要在变量中保留额外数量，而不是仅为.25复选框。



如何使用单选按钮执行此操作？我还有3个单选按钮，每个按钮的数量都会改变小计。



谢谢。



我尝试过什么：



一个非常蹩脚的if / else语句将变量addOns更改为addOns = 0 + .25但它不起作用正确。

.25 cent ingredient that the customer can choose to add.

How do I add .25 to the subtotal for each checkbox that is selected? (Keep in mind, I need to hold the "extras" amount in a variable rather than just tacking on .25 for each check box.

How do I do this with radio buttons? I also have 3 radio buttons, each with an amount that alters the subtotal.

Thanks.

What I have tried:

A really lame if/else statement that changed the variable "addOns" to "addOns = 0 + .25" but it didn't work correctly.

在同一容器（表单，面板等）中使用RadioButtons，其中只允许一个选项。使用CheckBoxes提供多个独立选择。



假设您有三个CheckBox：cbx1，cbx2，cbx3



0.定义变量，并为CheckStateChanged事件写一个EventHandler：

Use RadioButtons in the same container (Form, Panel, etc.) where only one choice is allowed. Use CheckBoxes to provide multiple independent choices.

Let's say you have three CheckBoxes: cbx1, cbx2, cbx3

0. define variables, and write an EventHandler for the CheckStateChanged event:

private decimal subtotal = 0.0m;
private CheckBox currentCbx;

private void Ingredients_CheckStateChanged(object sender, EventArgs e)
{
    currentCbx = sender as CheckBox;
    subtotal += currentCbx.Checked ? 0.25m : -0.25m;'

    // for testing
    textBox1.Text = subtotal.ToString();
}

1。在设计时将eventhandler连接到所有三个CheckBox，方法是选择它们，使用属性浏览器，或者在运行时的代码中。



使用这个技巧，你想要确保你的应用程序启动时CheckBoxes 全部未经检查。



另一种方法，如果你不需要动态更新小计，就是简单地编写一个方法来根据CheckBoxes的状态来计算值。

1. wire-up the eventhandler to all three CheckBoxes at design time by selecting them all, and using the Property Browser, or, in code at run-time.

Using this technique, you want to be sure the CheckBoxes are all unchecked when your app starts.

Another method, if you don't need dynamic updating of the sub-total, is to simply write a method to calculate the value based on the state of thee CheckBoxes.

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