Question
I'd like to select many values from a table with a list.
I have FabricTable(Year is int):
+----+-------+---------+------+
| Id | Color | Texture | Year |
+----+-------+---------+------+
| 1 | Red | Rough | 2019 |
+----+-------+---------+------+
| 2 | Green | Soft | 2019 |
+----+-------+---------+------+
| 3 | Blue | Rough | 2019 |
+----+-------+---------+------+
| 4 | Red | Med | 2019 |
+----+-------+---------+------+
| 5 | Blue | Soft | 2018 |
+----+-------+---------+------+
I have selectedItems list (year is int):
+---------+------+
| Texture | Year |
+---------+------+
| Rough | 2019 |
+---------+------+
| Soft | 2019 |
+---------+------+
I'd like to get the Id from table, it should result with Id = 1, 2, & 3.
How can I achieve this with Linq in C#? I just need to select by Texture & Year
Here's what I've tried but I'm not sure how to select from list with multiple values(selectedItems is a list but I don't know how to query multiple columns):
db.FabricTable.Select(o => o.Texture == selectedItems.Texture && o.Year == selectItems.Year)
Accepted Answer
You get a compiler error when using selectedItems.Texture because selectedItem is a list that contains an object with the Texture property. You need to check all of the items in the list when searching for the desired items in FabricTable:
var items = db.FabricTable.Where(o => selectedItems.Any(selectedItem => o.Texture == selectedItem.Texture && o.Year == selectedItem.Year));
Popular Answer
Try following :
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
namespace ConsoleApplication120
{
class Program
{
static void Main(string[] args)
{
List<Item> items = new List<Item>() {
new Item() { Id = 1, Color = "Red", Texture = "Rough", Year = 2019},
new Item() { Id = 2, Color = "Green", Texture = "Soft", Year = 2019},
new Item() { Id = 3, Color = "Blue", Texture = "Rough", Year = 2019},
new Item() { Id = 4, Color = "Red", Texture = "Soft", Year = 2018}
};
DataTable dt = new DataTable();
dt.Columns.Add("Color", typeof(string));
dt.Columns.Add("Texture", typeof(string));
dt.Columns.Add("Year", typeof(int));
foreach (Item item in items.Where(x => (x.Texture == "Rough") && (x.Year == 2019)))
{
dt.Rows.Add(new object[] { item.Color, item.Texture, item.Year });
}
}
}
public class Item
{
public int Id { get; set; }
public string Color { get; set; }
public string Texture { get; set; }
public int Year { get; set; }
}
}
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