C# |字典。ContainsValue()方法
原文:https://www . geesforgeks . org/c-sharp-dictionary-contains value-method/
该方法用于检查字典是否包含特定值。
语法:
public bool ContainsValue (TValue value);
在这里，值是要在字典中定位的值。参考类型的值可以是空值。
返回值:如果字典中包含指定值的元素，该方法返回 true ，否则返回 false 。
以下是说明词典【TKey】使用的程序，TValue >。ContainsValue()方法:
例 1:
// C# code to check if a value
// is present or not in a Dictionary.
using System;
using System.Collections.Generic;
class GFG {
// Driver code
public static void Main()
{
// Create a new dictionary of
// strings, with string keys.
Dictionary<string, string> myDict =
new Dictionary<string, string>();
// Adding key/value pairs in myDict
myDict.Add("Australia", "Canberra");
myDict.Add("Belgium", "Brussels");
myDict.Add("Netherlands", "Amsterdam");
myDict.Add("China", "Beijing");
myDict.Add("Russia", "Moscow");
myDict.Add("India", "New Delhi");
// Checking the value "India" but
// here "India" is the key
if (myDict.ContainsValue("India"))
Console.WriteLine("Value : India is present.");
else
Console.WriteLine("Value : India is not present.");
}
}
输出:
Value : India is not present.
例 2:
// C# code to check if a value is
// present or not in a Dictionary.
using System;
using System.Collections.Generic;
class GFG {
// Driver code
public static void Main()
{
// Create a new dictionary of
// strings, with string keys.
Dictionary<string, string> myDict =
new Dictionary<string, string>();
// Adding key/value pairs in myDict
myDict.Add("Australia", "Canberra");
myDict.Add("Belgium", "Brussels");
myDict.Add("Netherlands", "Amsterdam");
myDict.Add("China", "Beijing");
myDict.Add("Russia", "Moscow");
myDict.Add("India", "New Delhi");
// Checking for value Moscow
if (myDict.ContainsValue("Moscow"))
Console.WriteLine("Value : Moscow is present");
else
Console.WriteLine("Value : Moscow is absent");
}
}
Output:
Value : Moscow is present
参考:
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