C#中的SortedDictionary.Clear()方法用于从SortedDictionary <TKey,TValue>中删除所有元素。
语法如下-
public void Clear ();
现在让我们看一个例子-
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(100, "Mobile"); sortedDict.Add(200, "Laptop"); sortedDict.Add(300, "Desktop"); sortedDict.Add(400, "Speakers"); sortedDict.Add(500, "Headphone"); sortedDict.Add(600, "Earphone"); 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); Console.WriteLine("\nThe SortedDictionary has the key 200? = "+sortedDict.ContainsKey(200)); sortedDict.Clear(); Console.WriteLine("Count of SortedDictionary key-value pairs = "+sortedDict.Count); } }
输出结果
这将产生以下输出-
SortedDictionary key-value pairs... Key = 100, Value = Mobile Key = 200, Value = Laptop Key = 300, Value = Desktop Key = 400, Value = Speakers Key = 500, Value = Headphone Key = 600, Value = Earphone Count of SortedDictionary key-value pairs = 6 The SortedDictionary has the key 200? = True Count of SortedDictionary key-value pairs = 0
现在让我们来看另一个示例-
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(100, "Inspiron"); sortedDict.Add(200, "Alienware"); sortedDict.Add(300, "Projectors"); sortedDict.Add(400, "XPS"); 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(800, "Notebook"); sortedDict.Add(10000, "Bluetooth Speaker"); Console.WriteLine("\nSortedDictionary 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); sortedDict.Clear(); Console.WriteLine("\nCount of SortedDictionary key-value pairs (UPDATED) = "+sortedDict.Count); } }
输出结果
这将产生以下输出-
SortedDictionary key-value pairs... Key = 100, Value = Inspiron Key = 200, Value = Alienware Key = 300, Value = Projectors Key = 400, Value = XPS Count of SortedDictionary key-value pairs = 4 SortedDictionary key-value pairs...UPDATED Key = 100, Value = Inspiron Key = 200, Value = Alienware Key = 300, Value = Projectors Key = 400, Value = XPS Key = 800, Value = Notebook Key = 10000, Value = Bluetooth Speaker Count of SortedDictionary key-value pairs (UPDATED) = 6 Count of SortedDictionary key-value pairs (UPDATED) = 0