C# 检查组合框是否包含项目
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Check if a ComboBox Contains Item
提问by Elmo
I have this:
我有这个：
<ComboBox SelectedValuePath="Content" x:Name="cb">
<ComboBoxItem>Combo</ComboBoxItem>
<ComboBoxItem>Box</ComboBoxItem>
<ComboBoxItem>Item</ComboBoxItem>
</ComboBox>
If I use
如果我使用
cb.Items.Contains("Combo")
or
或者
cb.Items.Contains(new ComboBoxItem {Content = "Combo"})
it returns False.
它返回False。
Can anyone tell me how do I check if a ComboBoxItemnamed Comboexists in the ComboBoxcb?
谁能告诉我如何检查ComboBoxItem命名中是否Combo存在ComboBoxcb？
采纳答案by Rohit Vats
Items is an ItemCollectionand not list of strings. In your case its a collection of ComboboxItemand you need to check its Contentproperty.
项目是一个ItemCollection和not list of strings。在你的情况下是 a collection of ComboboxItem，你需要检查它的Content属性。
cb.Items.Cast<ComboBoxItem>().Any(cbi => cbi.Content.Equals("Combo"));
OR
或者
cb.Items.OfType<ComboBoxItem>().Any(cbi => cbi.Content.Equals("Combo"));
You can loop over each item and break in case you found desired item -
您可以遍历每个项目并在找到所需项目时中断 -
bool itemExists = false;
foreach (ComboBoxItem cbi in cb.Items)
{
itemExists = cbi.Content.Equals("Combo");
if (itemExists) break;
}
回答by Ming Slogar
If you want to use the Containsfunction as in cb.Items.Contains("Combo")you have to add strings to your ComboBox, not ComboBoxItems: cb.Items.Add("Combo"). The string will display just like a ComboBoxItem.
如果您想使用该Contains函数，cb.Items.Contains("Combo")您必须将字符串添加到 ComboBox，而不是 ComboBoxItems: cb.Items.Add("Combo")。该字符串将像 ComboBoxItem 一样显示。
