C# |检查哈希表是否包含特定值
原文:https://www . geesforgeks . org/c-sharp-check-if-hashtable-contains-specific-value/
哈希表类表示基于键的哈希代码组织的键和值对的集合。该键用于访问集合中的项。哈希表。ContainsValue(Object)方法用于检查哈希表是否包含特定的值。
语法:
public virtual bool ContainsValue(object value);
参数:
值:类型系统的值。对象在哈希表中定位。值可以为空。
返回类型:如果哈希表包含具有指定值的元素，该方法返回真，否则返回假。该方法的返回类型为系统。布尔。
下面给出了一些例子，以便更好地理解实现:
例 1:
// C# code to check if the HashTable
// contains a specific Value
using System;
using System.Collections;
class GFG {
// Driver code
public static void Main()
{
// Creating a Hashtable
Hashtable myTable = new Hashtable();
// Adding elements in Hashtable
myTable.Add("g", "geeks");
myTable.Add("c", "c++");
myTable.Add("d", "data structures");
myTable.Add("q", "quiz");
// check if the HashTable contains
// the required Value or not.
if (myTable.ContainsValue("c++"))
Console.WriteLine("myTable contains the Value");
else
Console.WriteLine("myTable doesn't contain the Value");
}
}
Output:
myTable contains the Value
例 2:
// C# code to check if the HashTable
// contains a specific Value
using System;
using System.Collections;
class GFG {
// Driver code
public static void Main()
{
// Creating a Hashtable
Hashtable myTable = new Hashtable();
// Adding elements in Hashtable
myTable.Add("India", "Country");
myTable.Add("Chandigarh", "City");
myTable.Add("Mars", "Planet");
myTable.Add("China", "Country");
// check if the HashTable contains
// the required Value or not.
if (myTable.ContainsKey("Ocean"))
Console.WriteLine("myTable contains the Value");
else
Console.WriteLine("myTable doesn't contain the Value");
}
}
Output:
myTable doesn't contain the Value
参考:
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