C＃|从StringCollection中删除所有字符串

StringCollection类是.NET Framework类库的新添加，它表示字符串的集合。 StringCollection类在System.Collections.Specialized命名空间中定义。

StringCollection.Clear方法用于从StringCollection中删除所有字符串。

句法：

public void Clear ();

笔记：

• Count设置为零，并且还会释放对集合元素中其他对象的引用。
• 此方法是O(n)运算，其中n是Count。

例子：

// C# code to insert a string into
// the StringCollection at the
// specified index
using System;
using System.Collections;
using System.Collections.Specialized;
  
class GFG {
  
    // Driver code
    public static void Main()
    {
  
        // creating a StringCollection named myCol
        StringCollection myCol = new StringCollection();
  
        // creating a string array named myArr
        String[] myArr = new String[] {"Hello", "Geeks", 
                                "for", "GeeksforGeeks"};
  
        // Copying the elements of a string
        // array to the end of the StringCollection.
        myCol.AddRange(myArr);
  
        Console.WriteLine("Initially elements in StringCollection are: ");
  
        // Displaying elements in StringCollection
        // named myCol
        foreach(Object obj in myCol)
            Console.WriteLine(obj);
  
        // Removing all the elements from StringCollection
        myCol.Clear();
  
        Console.WriteLine("After Removing: ");
  
        // Displaying elements in StringCollection
        // named myCol
        foreach(Object obj in myCol)
            Console.WriteLine(obj);
    }
}

输出：

Initially elements in StringCollection are: 
Hello
Geeks
for
GeeksforGeeks
After Removing:

参考：

• https://docs.microsoft.com/zh-cn/dotnet/api/system.collections.specialized.stringcollection.clear?view=netframework-4.7.2