使用按钮在文本框中添加列表框 [英] Adding Listbox in textbox using button

问题描述

嗨
我有一个列表框和文本框
我需要在列表框中添加所有值的总和，然后在包括文本框值的文本框中发布总计.

技术-使用Windows窗体的C#.net

Hi
I have a listbox and textbox
I need to add the sum of all values in a listbox and post the total in a textbox including textbox value.

Technology - C#.net using windows form

推荐答案

此处是操作方法:

Here is how to do it:

static int Sum(ListBox listBox) {
    int result = 0;
    for (int index = 0; index < listBox.Items.Count; ++index) {
        int value;
        if (!int.TryParse(listBox.Items[index], out value)) continue;
        result += value;
    }
    return result;
}

//...

int sum = 0;

//what does it mean "including text box value"?
//perhapse, this (optional):
int textBoxValue = 0;
int.TryParse(MyTextBox.Text, out textBoxValue);
sum += textBoxValue;

sum += Sum(MyListBox);

MyTextBox.Text = sum.ToString());

如果数字类型不是int，则相应地更改代码(使用double或Sum中的任何内容).

—SA

If the numeric type if not int, changes the code accordingly (use double or whatever in Sum).

—SA

这样做:

Do it like this :

double total=0;
foreach (object item in listBox1.Items)
{
    total += (double)item;
}
txtTotal.Text = total.ToString();

或者如果您将值作为字符串，则使用double.Parse(item)而不是 (double)item.

or if you have the values as string, then use double.Parse(item) instead of (double)item.

另一种方法是，您可以使用泛型并在一行中执行

喜欢

Another way is u can use Generics and do this in a single line

Like

int total = ListBox1.Items.Cast<listitem>().Select<listitem,>(s => Convert.ToInt32(s.Text)).Aggregate((a, b) => a + b);
</listitem>

但根据KIM TOGO的介绍，简短而甜美

but as per KIM TOGO, the short and sweet

ListBox1.Items.Cast<listitem>().Sum(item => int.Parse(item.Text));</listitem>

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