การแทรกรายการใหม่ใน OrderedDictionary ด้วยคีย์และค่าที่ระบุใน C#

ภาพรวม

เมธอด OrderedDictionary.Insert(Int32, Object, Object) แทรกคู่คีย์/ค่าใหม่ที่ดัชนีที่ระบุ พร้อมรักษาลำดับ

ตัวอย่าง 1: แทรกที่ดัชนี 7

using System;
using System.Collections;
using System.Collections.Specialized;

public class Demo {
    public static void Main() {
        OrderedDictionary dict = new OrderedDictionary();
        dict.Add("1", "One");
        dict.Add("2", "Two");
        dict.Add("3", "Three");
        dict.Add("4", "Four");
        dict.Add("5", "Five");
        dict.Add("6", "Six");
        dict.Add("7", "Seven");
        dict.Add("8", "Eight");

        Console.WriteLine("Elements...");
        IDictionaryEnumerator demoEnum = dict.GetEnumerator();
        while (demoEnum.MoveNext()) {
            Console.WriteLine("Key = " + demoEnum.Key + ", Value = " + demoEnum.Value);
        }

        dict.Insert(7, "15", "Fifteen");

        Console.WriteLine("Elements...UPDATED");
        demoEnum = dict.GetEnumerator();
        while (demoEnum.MoveNext()) {
            Console.WriteLine("Key = " + demoEnum.Key + ", Value = " + demoEnum.Value);
        }
    }
}

ผลลัพธ์ตัวอย่าง 1

Elements...
Key = 1, Value = One
Key = 2, Value = Two
Key = 3, Value = Three
Key = 4, Value = Four
Key = 5, Value = Five
Key = 6, Value = Six
Key = 7, Value = Seven
Key = 8, Value = Eight
Elements...UPDATED
Key = 1, Value = One
Key = 2, Value = Two
Key = 3, Value = Three
Key = 4, Value = Four
Key = 5, Value = Five
Key = 6, Value = Six
Key = 7, Value = Seven
Key = 15, Value = Fifteen
Key = 8, Value = Eight

ตัวอย่าง 2: เพิ่มด้วย Add แล้ว Insert กลาง

using System;
using System.Collections;
using System.Collections.Specialized;

public class Demo {
    public static void Main() {
        OrderedDictionary dict = new OrderedDictionary();
        dict.Add("A", "Laptop");
        dict.Add("B", "Desktop");

        Console.WriteLine("Elements...");
        IDictionaryEnumerator demoEnum = dict.GetEnumerator();
        while (demoEnum.MoveNext()) {
            Console.WriteLine("Key = " + demoEnum.Key + ", Value = " + demoEnum.Value);
        }

        dict.Add("C", "Ultrabook");
        dict.Add("D", "Alienware");

        Console.WriteLine("\nElements...UPDATED");
        demoEnum = dict.GetEnumerator();
        while (demoEnum.MoveNext()) {
            Console.WriteLine("Key = " + demoEnum.Key + ", Value = " + demoEnum.Value);
        }

        dict.Insert(2, "K", "Speakers");

        Console.WriteLine("\nElements...UPDATED");
        demoEnum = dict.GetEnumerator();
        while (demoEnum.MoveNext()) {
            Console.WriteLine("Key = " + demoEnum.Key + ", Value = " + demoEnum.Value);
        }
    }
}

ผลลัพธ์ตัวอย่าง 2

Elements...
Key = A, Value = Laptop
Key = B, Value = Desktop
Elements...UPDATED
Key = A, Value = Laptop
Key = B, Value = Desktop
Key = C, Value = Ultrabook
Key = D, Value = Alienware
Elements...UPDATED
Key = A, Value = Laptop
Key = B, Value = Desktop
Key = K, Value = Speakers
Key = C, Value = Ultrabook
Key = D, Value = Alienware

สรุป

• ใช้ IDictionaryEnumerator วนลูป (Key/Value)
• Insert เลื่อนรายการหลังไปข้างหลัง
• คีย์ต้อง unique