C# Hashtable ContainsKey
Description
Hashtable ContainsKey determines whether the Hashtable
contains a specific key.
Syntax
Hashtable.ContainsKey has the following syntax.
public virtual bool ContainsKey(
Object key
)
Parameters
Hashtable.ContainsKey has the following parameters.
key- The key to locate in the Hashtable.
Returns
Hashtable.ContainsKey method returns true if the Hashtable contains an element with the specified key; otherwise,
false.
Example
We can
use the ContainsKey() method to check if
Hashtable contains a key.
using System;//from www. j a va 2s . c o m
using System.Collections;
class MainClass
{
public static void Main()
{
Hashtable myHashtable = new Hashtable();
myHashtable.Add("AL", "Alabama");
myHashtable.Add("CA", "California");
myHashtable.Add("FL", "Florida");
myHashtable.Add("NY", "New York");
myHashtable.Add("WY", "Wyoming");
foreach (string myKey in myHashtable.Keys)
{
Console.WriteLine("myKey = " + myKey);
}
foreach(string myValue in myHashtable.Values)
{
Console.WriteLine("myValue = " + myValue);
}
if (myHashtable.ContainsKey("FL"))
{
Console.WriteLine("myHashtable contains the key FL");
}
}
}
The code above generates the following result.
