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排序。
用法:
public void Add (TKey key, TValue value);
参数:
-
key:这是要添加的元素的关键。
value:它是要添加的元素的值。对于引用类型,该值可以为null。
异常:
- ArgumentNullException:如果键为null。
- ArgumentException:如果字典中已经存在具有相同键的元素。
以下示例程序旨在说明Dictionary.Add()方法的使用:
示例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);
}
}
}
输出:
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
示例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.");
}
}
}
输出:
An element with Key = "Russia" already exists.
注意:
- 键不能为null,但值可以为null。如果值类型TValue是引用类型。
- 此方法是O(log n)操作,其中n是SortedDictionary中的元素计数。
参考:
相关用法
注:本文由纯净天空筛选整理自rupesh_rao大神的英文原创作品 C# | SortedDictionary.Add() Method。非经特殊声明,原始代码版权归原作者所有,本译文未经允许或授权,请勿转载或复制。