C# Dictionary.Remove()用法及代碼示例

C# 中的 Dictionary.Remove() 屬性用於從 Dictionary<TKey, TValue> 中刪除具有指定鍵的值。

用法

以下是語法 -

public bool Remove (TKey key);

上麵，關鍵是要刪除的關鍵。

示例

現在讓我們看一個實現 Dictionary.Remove() 屬性的示例 -

using System;
using System.Collections.Generic;
public class Demo {
   public static void Main(){
      Dictionary<string, string> dict =
      new Dictionary<string, string>();
      dict.Add("One", "Kagido");
      dict.Add("Two", "Ngidi");
      dict.Add("Three", "Devillers");
      dict.Add("Four", "Smith");
      dict.Add("Five", "Warner");
      Console.WriteLine("Count of elements = "+dict.Count);
      Console.WriteLine("Removing some keys...");
      dict.Remove("Four");
      dict.Remove("Five");
      Console.WriteLine("Count of elements (updated) = "+dict.Count);
      Console.WriteLine("\nKey/value pairs...");
      foreach(KeyValuePair<string, string> res in dict){
         Console.WriteLine("Key = {0}, Value = {1}", res.Key, res.Value);
      }
      Console.Write("\nAll the keys..\n");
      Dictionary<string, string>.KeyCollection allKeys = dict.Keys;
      foreach(string str in allKeys){
         Console.WriteLine("Key = {0}", str);
      }
   }
}

輸出

這將產生以下輸出 -

Count of elements = 5
Removing some keys...
Count of elements (updated) = 3
Key/value pairs...
Key = One, Value = Kagido
Key = Two, Value = Ngidi
Key = Three, Value = Devillers
All the keys..
Key = One
Key = Two
Key = Three

示例

現在讓我們看另一個例子來實現 Dictionary.Remove() 方法 -

using System;
using System.Collections.Generic;
public class Demo {
   public static void Main(){
      Dictionary<string, string> dict =
      new Dictionary<string, string>();
      dict.Add("One", "Kagido");
      dict.Add("Two", "Ngidi");
      dict.Add("Three", "Devillers");
      dict.Add("Four", "Smith");
      dict.Add("Five", "Warner");
      Console.WriteLine("Count of elements = "+dict.Count);
      Console.Write("\nAll the keys..\n");
      Dictionary<string, string>.KeyCollection allKeys = dict.Keys;
      foreach(string str in allKeys){
         Console.WriteLine("Key = {0}", str);
      }
      Console.WriteLine("Removing some keys...");
      dict.Remove("Four");
      dict.Remove("Five");
      Console.WriteLine("Count of elements (updated) = "+dict.Count);
      Console.Write("\nAll the keys..updated\n");
      foreach(string str in allKeys){
         Console.WriteLine("Key = {0}", str);
      }
      Console.WriteLine("\nKey/value pairs...");
      foreach(KeyValuePair<string, string> res in dict){
         Console.WriteLine("Key = {0}, Value = {1}", res.Key, res.Value);
      }
   }
}

輸出

這將產生以下輸出 -

Count of elements = 5
All the keys..
Key = One
Key = Two
Key = Three
Key = Four
Key = Five
Removing some keys...
Count of elements (updated) = 3
All the keys..updated
Key = One
Key = Two
Key = Three
Key/value pairs...
Key = One, Value = Kagido
Key = Two, Value = Ngidi
Key = Three, Value = Devillers