C# | Check if the StringDictionary contains a specific value (original) (raw)

Last Updated : 01 Feb, 2019

StringDictionary.ContainsValue(String) method is used to check whether the StringDictionary contains a specific value or not.Syntax:

public virtual bool ContainsValue (string value);

Here, value is the value to locate in the StringDictionary. The value can be null.Return Value: The method returns true if the StringDictionary contains an element with the specified value, otherwise it returns false. Below programs illustrate the use of StringDictionary.ContainsValue(String) method:Example 1:

CSHARP `

// C# code to check if the // StringDictionary contains // a specific value 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("G", "Geeks");
myDict.Add("F", "For");
myDict.Add("C", "C++");
myDict.Add("DS", "Data Structures");
myDict.Add("N", "Noida");

// Checking if "C++" is contained in
// StringDictionary myDict
if (myDict.ContainsValue("C++"))
    Console.WriteLine("StringDictionary myDict contains the value");
else
    Console.WriteLine("StringDictionary myDict does not contain the value");
}

}

Output:

StringDictionary myDict contains the value

Example 2:

CSHARP `

// C# code to check if the // StringDictionary contains // a specific value 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("G", "Geeks");
myDict.Add("F", "For");
myDict.Add("C", "C++");
myDict.Add("DS", "Data Structures");
myDict.Add("N", "Noida");

// Checking if "null" is contained in
// StringDictionary myDict
// It should not raise any exception
if (myDict.ContainsValue(null))
    Console.WriteLine("StringDictionary myDict contains the value");
else
    Console.WriteLine("StringDictionary myDict does not contain the value");
}

}

Output:

StringDictionary myDict does not contain the value

Note:

The values of the elements of the StringDictionary are compared to the specified value using the Object.Equals method.
This method is an O(n) operation, where n is Count.

Reference:

https://docs.microsoft.com/en-us/dotnet/api/system.collections.specialized.stringdictionary.containsvalue?view=netframework-4.7.2

C# | Check if the StringDictionary contains a specific value (original) (raw)

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