如何仅使用部分文本搜索列表框项目

Question

I have a C# WinForms application. There is a listbox filled with values in this format:

category:user:id
Food:tester:17

etc.

Now, I need to get if an item is included in this Listbox, knowing only the category and ID, I don't know the user. So technically, I need to do something like this (pseudocode):

if(MyListBox.Items.Contains("Food:*:17"))

where the * would mean "anything". Is there a way of doing this?

Answer 1

Assuming the listbox is filled directly with strings, the easiest way would be a combination of linq and regex:

 if(MyListBox.Items.Cast<string>().Any(s => Regex.IsMatch(s, "Food:.*:17")))  //(For RegEx: using System.Text.RegularExpressions )

or more strict, if the items are always a combination of value:value:value and you only check the first and third value:

if (MyListBox.Items.Cast<string>().Any(s => { var values = s.Split(':'); return values[0] == "Food" && values[2] == "17"; }))

Answer 2

try something like this

var res =
               MyListBox.items.SingleOrDefault(
                    item =>
                    item.Contains("Food:") && item.Contains(":17") &&
                    item.IndexOf(":17", StringComparison.InvariantCulture) >
                    item.IndexOf("Food:", StringComparison.InvariantCulture));
                if ( !string.IsNullOrEmpty(res))
            {
              //your code here 
            }



            }

Answer 3

You could do something like

var value = MyListBox.Items.Cast<string>()
    .FirstOrDefault(m => m.Contains("Food:") && m.Contains(":17"));
if (value != null) {
    // you have a match
}