使用Lambda表达式遍历复选框列表 [英] Loop through Checkbox List using Lambda Expressions

问题描述

我有一个复选框列表项列表.如何使用lambda表达式遍历这些表达式并将其文本属性读入字符串生成器对象?

I have a list of checkbox list items. How do I use lambda expressions to loop through these and get their text attributes read into a string builder object?

<asp:CheckBoxList ID="CountryList" runat="server" RepeatDirection="Vertical">
<asp:ListItem Text="Australia" Value="AU" />
<asp:ListItem Text="Belgium" Value="BG" />
<asp:ListItem Text="Canada" Value="CA" />
<asp:ListItem Text="France" Value="FR" />
</asp:CheckBoxList>

预先感谢

推荐答案

看这个人，这是获取列表项文本的最佳方法

look man this is the best way to get the text of the list items

List<ListItem> lst = new List<ListItem>();
foreach (ListItem item in CountryList.Items)
{
   lst.Add(item);
}

和lambda表达式用作:

and lambda exepression used as this:

ListItem itm = lst.First(p => p.Text == "blablabla");

您的意思是这样的吗?

You mean something like this?

StringBuilder sbWithOneItemTextPerLine = new StringBuilder();           
CheckBoxList.Items.ForEach(item => sbWithOneItemTextPerLine.AppendLine(item.Text);

当然，只有语法糖-我认为这样做不适合-您没有解释您的要求...

Of course, only syntactic sugar - I wouldn''t see fit to do it like this - you didn''t explain you requirements...

这有效！

This works!

var p = (from item in CountryList.Items.Cast<ListItem>()
                     where item.Selected
                     select item).ToArray();

sb.AppendFormat("<strong>Countries selected:</strong> {0}<br />", String.Join(", ", p.ToStringArray(false)));

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