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法律研究C# 中的 SortedDictionary.Item[] 属性
C# 中的 SortedDictionary.Item[] 属性用于获取或设置与指定键关联的值。
语法
语法如下 −
public TValue this[TKey k] { get; set; }上述语法中，k 值是要获取或设置的值的键。
示例
我们来看一个示例 −
using System;
using System.Collections;
using System.Collections.Generic;
public class Demo {
public static void Main(){
SortedDictionary<int, string> sortedDict = new SortedDictionary<int, string>();
sortedDict.Add(1, "One");
sortedDict.Add(2, "Two");
sortedDict.Add(3, "Three");
sortedDict.Add(4, "Four");
sortedDict.Add(5, "Five");
sortedDict.Add(6, "Six");
Console.WriteLine("SortedDictionary key-value pairs...");
IDictionaryEnumerator demoEnum = sortedDict.GetEnumerator();
while (demoEnum.MoveNext())
Console.WriteLine("Key = " + demoEnum.Key + ", Value = " + demoEnum.Value);
Console.WriteLine("Count of SortedDictionary key-value pairs = "+sortedDict.Count);
sortedDict.Add(7, "Seven");
sortedDict.Add(8, "Eight");
Console.WriteLine("
SortedDictionary key-value pairs...UPDATED");
demoEnum = sortedDict.GetEnumerator();
while (demoEnum.MoveNext())
Console.WriteLine("Key = " + demoEnum.Key + ", Value = " + demoEnum.Value);
Console.WriteLine("Count of SortedDictionary key-value pairs (UPDATED) = "+sortedDict.Count);
Console.WriteLine("Value in the SortedDictionary key-value pair key five = "+sortedDict[5]);
sortedDict.Clear();
Console.WriteLine("
Count of SortedDictionary key-value pairs (UPDATED) = "+sortedDict.Count);
}
}输出
这将产生以下输出 −
Key = 1, Value = One Key = 2, Value = Two Key = 3, Value = Three Key = 4, Value = Four Key = 5, Value = Five Key = 6, Value = Six Count of SortedDictionary key-value pairs = 6 SortedDictionary key-value pairs...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 = 8, Value = Eight Count of SortedDictionary key-value pairs (UPDATED) = 8 Value in the SortedDictionary key-value pair key five = Five Count of SortedDictionary key-value pairs (UPDATED) = 0
示例
我们再看一个示例 −
using System;
using System.Collections;
using System.Collections.Generic;
public class Demo {
public static void Main(){
SortedDictionary<int, string> sortedDict = new SortedDictionary<int, string>();
sortedDict.Add(1, "SUV");
sortedDict.Add(2, "MUV");
sortedDict.Add(3, "Utility Vehicle");
sortedDict.Add(4, "AUV");
sortedDict.Add(5, "Hatchback");
sortedDict.Add(6, "Convertible");
Console.WriteLine("SortedDictionary key-value pairs...");
IDictionaryEnumerator demoEnum = sortedDict.GetEnumerator();
while (demoEnum.MoveNext())
Console.WriteLine("Key = " + demoEnum.Key + ", Value = " + demoEnum.Value);
Console.WriteLine("Count of SortedDictionary key-value pairs = "+sortedDict.Count);
sortedDict.Add(7, "Seven");
sortedDict.Add(8, "Eight");
Console.WriteLine("
SortedDictionary key-value pairs...UPDATED");
demoEnum = sortedDict.GetEnumerator();
while (demoEnum.MoveNext())
Console.WriteLine("Key = " + demoEnum.Key + ", Value = " + demoEnum.Value);
Console.WriteLine("Count of SortedDictionary key-value pairs (UPDATED) = "+sortedDict.Count);
Console.WriteLine("Value in the SortedDictionary key-value pair key five = "+sortedDict[5]);
sortedDict[5] = "Crossover";
Console.WriteLine("Value in the SortedDictionary key-value pair key five (updated) = "+sortedDict[5]);
sortedDict.Clear();
Console.WriteLine("
Count of SortedDictionary key-value pairs (UPDATED) = "+sortedDict.Count);
}
}输出
这将产生以下输出 −
SortedDictionary key-value pairs... Key = 1, Value = SUV Key = 2, Value = MUV Key = 3, Value = Utility Vehicle Key = 4, Value = AUV Key = 5, Value = Hatchback Key = 6, Value = Convertible Count of SortedDictionary key-value pairs = 6 SortedDictionary key-value pairs...UPDATED Key = 1, Value = SUV Key = 2, Value = MUV Key = 3, Value = Utility Vehicle Key = 4, Value = AUV Key = 5, Value = Hatchback Key = 6, Value = Convertible Key = 7, Value = Seven Key = 8, Value = Eight Count of SortedDictionary key-value pairs (UPDATED) = 8 Value in the SortedDictionary key-value pair key five = Hatchback Value in the SortedDictionary key-value pair key five (updated) = Crossover Count of SortedDictionary key-value pairs (UPDATED) = 0
更新时间：03-Dec-2019
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