C# | SortedDictionary。添加()方法
原文:https://www . geeksforgeeks . org/cs harp-sorted dictionary-add-method/
这用于将指定的键和值添加到已排序的字典中。元素根据 TKey 进行排序。
语法:
public void Add (TKey key, TValue value);
参数:
键:是要添加的元素的键。 值:是元素添加的值。对于引用类型，该值可以为 null。
异常:
- ArgumentNullException : 如果密钥为空。
- ArgumentException : 如果字典中已经存在具有相同键的元素。
以下是说明使用字典< TKey，TValue >的程序。添加()方法:
例 1:
// C# code to add the specified key
// and value into the SortedDictionary
using System;
using System.Collections.Generic;
class GFG {
// Driver code
public static void Main()
{
// Create a new SortedDictionary
// of strings, with string keys.
SortedDictionary<string, string> myDict =
new SortedDictionary<string, string>();
// Adding key/value pairs in myDict
myDict.Add("Australia", "Canberra");
myDict.Add("Belgium", "Brussels");
myDict.Add("Netherlands", "Amsterdam");
myDict.Add("China", "Beijing");
myDict.Add("Russia", "Moscow");
myDict.Add("India", "New Delhi");
// To get count of key/value
// pairs in myDict
Console.WriteLine("Total key/value pairs in"
+ " myDict are : " + myDict.Count);
// Displaying the key/value
// pairs in myDict
Console.WriteLine("The key/value pairs"
+ " in myDict are : ");
foreach(KeyValuePair<string, string> kvp in myDict)
{
Console.WriteLine("Key = {0}, Value = {1}",
kvp.Key, kvp.Value);
}
}
}
Output:
Total key/value pairs in myDict are : 6
The key/value pairs in myDict are :
Key = Australia, Value = Canberra
Key = Belgium, Value = Brussels
Key = China, Value = Beijing
Key = India, Value = New Delhi
Key = Netherlands, Value = Amsterdam
Key = Russia, Value = Moscow
例 2:
// C# code to add the specified key
// and value into the SortedDictionary
using System;
using System.Collections.Generic;
class GFG {
// Driver code
public static void Main()
{
// Create a new SortedDictionary
// of strings, with string keys.
SortedDictionary<string, string> myDict =
new SortedDictionary<string, string>();
// Adding key/value pairs in myDict
myDict.Add("Australia", "Canberra");
myDict.Add("Belgium", "Brussels");
myDict.Add("Netherlands", "Amsterdam");
myDict.Add("China", "Beijing");
myDict.Add("Russia", "Moscow");
myDict.Add("India", "New Delhi");
// The Add method throws an
// exception if the new key is
// already in the dictionary.
try {
myDict.Add("Russia", "Moscow");
}
catch (ArgumentException) {
Console.WriteLine("An element with Key "
+ "= \"Russia\" already exists.");
}
}
}
Output:
An element with Key = "Russia" already exists.
注:
- 键不能为空，但值可以为空。如果值类型 TValue 是引用类型。
- 这个方法是一个 O(log n)操作，其中 n 是 SortedDictionary 中元素的计数。
参考:
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