C# |从字符串中删除所有条目
原文:https://www . geeksforgeeks . org/c-sharp-remove-all-entries-from-stringdictionary/
StringDictionary。清除方法用于从字符串中移除所有条目。
语法:
public virtual void Clear ();
异常:如果字符串为只读，此方法将给出 NotSupportedException 。
示例:
// C# code to remove all entries
// from the StringDictionary
using System;
using System.Collections;
using System.Collections.Specialized;
class GFG {
// Driver code
public static void Main()
{
// Creating a StringDictionary named myDict
StringDictionary myDict = new StringDictionary();
// Adding key and value into the StringDictionary
myDict.Add("A", "Apple");
myDict.Add("B", "Banana");
myDict.Add("C", "Cat");
myDict.Add("D", "Dog");
myDict.Add("E", "Elephant");
myDict.Add("F", "Fish");
// Displaying the keys and values in StringDictionary
Console.WriteLine("The number of key/value pairs are : " + myDict.Count);
foreach(DictionaryEntry dic in myDict)
{
Console.WriteLine(dic.Key + " " + dic.Value);
}
// Removing all entries from the StringDictionary
myDict.Clear();
// Displaying the keys and values in StringDictionary
Console.WriteLine("The number of key/value pairs are : " + myDict.Count);
foreach(DictionaryEntry dic in myDict)
{
Console.WriteLine(dic.Key + " " + dic.Value);
}
}
}
Output:
The number of key/value pairs are : 6
b Banana
c Cat
a Apple
f Fish
d Dog
e Elephant
The number of key/value pairs are : 0
注:此方法为 O(n)运算，其中 n 为 Count。
参考:
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