[英]C# Linq query to join two lists and assign the result to combobox
我有兩個字符串列表
Lista Listb
------------------------
apple mango
mango grapes
grapes watermelon
pineapple orange
banana
我想在組合框中顯示lista的所有項目,還選擇在這種情況下芒果和葡萄都通用的項目,並在組合框中進行預檢查
combobox items
---------------------
apple
mango - checked
grapes - checked
pineapple
banana
以下應為您提供一個包含Lista
值的列表以及有關是否應在IsChecked
屬性中檢查列表中的項目的附加信息:
var result = Lista.Select(a => new
{
Value = a,
IsChecked = Listb.Any(b => b == a)
}).ToList();
剩下的只是將結果綁定到組合框。 此步驟因您的平台(ASP.NET,WPF,Windows Form等,幾乎都具有組合框)而異,並且,我相信每個元素在Internet上都有據可查,因此您應該首先閱讀並嘗試一個。
你可以做
var listA = new[] {"apple", "mango", "grapes", "pineapple", "banana"};
var listB = new[] {"mango", "grapes", "watermelon", "orange"};
var common = listA.Intersect(listB);
得到重疊
嘗試在Linq中加入Left
var listA = new[] { "apple", "mango", "grapes", "pineapple", "banana" }.ToList();
var listB = new[] { "mango", "grapes", "watermelon", "orange" }.ToList();
var listCheckboxItem =
(
from a in listA
join b in listB on a equals b into lst
from item in lst.DefaultIfEmpty()
select new
{
Name = a,
IsChecked = !(string.IsNullOrEmpty(item))
}
).ToList();
Select
可以獲取一個布爾值列表,顯示兩個列表中都包含哪些元素。
List<string> Lista = new List<string>(new string[] { "apple", "mango", "grapes", "pineapple", "banana" });
List<string> Listb = new List<string>(new string[] {"mango","grapes","watermelon","orange"});
var inBoth = Lista.Select(x => Listb.Contains(x));
// False, True, True, False, False
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