C＃|获取StringCollection中的字符串数

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.Count属性用于获取StringCollection中包含的字符串数。

句法：

public int Count { get; }

返回值：返回StringCollection中包含的字符串数。

注意：检索此属性的值是O(1)操作。

下面的程序说明StringCollection.Count属性的用法：

范例1：

// C# code to get the number of strings
// contained in the StringCollection
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[] { "First", "Second", "Third",
                                        "Fourth", "Fifth" };
  
        // Copying the elements of a string
        // array to the end of the StringCollection.
        myCol.AddRange(myArr);
  
        // To get number of Strings contained
        // in the StringCollection
        Console.WriteLine("Number of strings in myCol are : " + myCol.Count);
    }
}

输出：

Number of strings in myCol are : 5

范例2：

// C# code to get the number of strings 
// contained in the StringCollection
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[] {};
  
        // Copying the elements of a string
        // array to the end of the StringCollection.
        myCol.AddRange(myArr);
  
        // To get number of Strings contained
        // in the StringCollection
        Console.WriteLine("Number of strings in myCol are : " 
                                              + myCol.Count);
    }
}

输出：

Number of strings in myCol are : 0

参考：

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