如何在C＃中使用linq查询将文本框中的值与字典进行匹配，并在按钮单击时在另一个文本框中显示它

Question

Dictionary<int, string> dictionary = new Dictionary<int, string>();
            dictionary.Add(04634, "AMBASAMUDRAM");
            dictionary.Add(04253, "ANAMALI");
            dictionary.Add(04153, "ARAKANDANALLUR");

Need linq query to get the key from textbox1 and match it to dictionary and displays the match value into textbox2 and this must be done on button click.

The below code is used without linq. And i need the same to done with the Linq Query.

private void button1_Click(object sender, EventArgs e)
        {
            string std = DoWork(Convert.ToInt32(textBox1.Text));
            textBox2.Text = std;

        }
        public string DoWork(int stdcode)
        {
            Dictionary<int, string> dictionary = new Dictionary<int, string>();
            dictionary.Add(04634, "AMBASAMUDRAM");
            dictionary.Add(04253, "ANAMALI");
            dictionary.Add(04153, "ARAKANDANALLUR");
            dictionary.Add(04371, "ARANTANGI");
            dictionary.Add(04320, "ARAVAKURICHI");
            dictionary.Add(04329, "ARIYALUR");

            return (dictionary[stdcode]);
        }

Answer 1

You can use

var fooDict= dictionary .Where(a=> a.Value == "AMBASAMUDRAM")

Answer 2

using System;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
      // Use a dictionary with an int key.
      Dictionary<int, string> dictionary = new Dictionary<int, string>();
        dictionary.Add(04634, "AMBASAMUDRAM");
        dictionary.Add(04253, "ANAMALI");
        dictionary.Add(04153, "ARAKANDANALLUR");
        // You can look up the int in the dictionary.
        if (dictionary.ContainsKey(04634))
        {
            String value = dictionary[04634];
            Console.WriteLine(value);
        }
    }
}

Output:

AMBASAMUDRAM

Using LINQ:

Dictionary<int, string> dictionary = new Dictionary<int, string>();
    dictionary.Add(04634, "AMBASAMUDRAM");
    dictionary.Add(04253, "ANAMALI");
    dictionary.Add(04153, "ARAKANDANALLUR");

var value = dictionary.FirstOrDefault(x=>x.Key.Contains(04634)).Value; 
Console.WriteLine(value);

Output:

AMBASAMUDRAM