Dictionary<TKey,TValue>.ContainsKey(TKey) Method

public:
 virtual bool ContainsKey(TKey key);

public bool ContainsKey(TKey key);

abstract member ContainsKey : 'Key -> bool
override this.ContainsKey : 'Key -> bool

Public Function ContainsKey (key As TKey) As Boolean

Parameters

Returns

true if the Dictionary<TKey,TValue> contains an element with the specified key; otherwise, false.

Implements

Exceptions

Examples

The following code example shows how to use the ContainsKey method to test whether a key exists prior to calling the Add method. It also shows how to use the TryGetValue method to retrieve values, which is an efficient way to retrieve values when a program frequently tries keys that are not in the dictionary. Finally, it shows the least efficient way to test whether keys exist, by using the Item[] property (the indexer in C#).

This code example is part of a larger example provided for the Dictionary<TKey,TValue> class (openWith is the name of the Dictionary used in this example).

// ContainsKey can be used to test keys before inserting
// them.
if (!openWith.ContainsKey("ht"))
{
 openWith.Add("ht", "hypertrm.exe");
 Console.WriteLine("Value added for key = \"ht\": {0}",
 openWith["ht"]);
}

// ContainsKey can be used to test keys before inserting
// them.
if openWith.ContainsKey "ht" |> not then
 openWith.Add("ht", "hypertrm.exe")
 printfn $"""Value added for key = "ht": {openWith["ht"]}"""

' ContainsKey can be used to test keys before inserting 
' them.
If Not openWith.ContainsKey("ht") Then
 openWith.Add("ht", "hypertrm.exe")
 Console.WriteLine("Value added for key = ""ht"": {0}", _
 openWith("ht"))
End If

// When a program often has to try keys that turn out not to
// be in the dictionary, TryGetValue can be a more efficient
// way to retrieve values.
string value = "";
if (openWith.TryGetValue("tif", out value))
{
 Console.WriteLine("For key = \"tif\", value = {0}.", value);
}
else
{
 Console.WriteLine("Key = \"tif\" is not found.");
}

// When a program often has to try keys that turn out not to
// be in the dictionary, TryGetValue can be a more efficient
// way to retrieve values.
match openWith.TryGetValue "tif" with
| true, value -> printfn $"For key = \"tif\", value = {value}."
| _ -> printfn "Key = \"tif\" is not found."

' When a program often has to try keys that turn out not to
' be in the dictionary, TryGetValue can be a more efficient 
' way to retrieve values.
Dim value As String = ""
If openWith.TryGetValue("tif", value) Then
 Console.WriteLine("For key = ""tif"", value = {0}.", value)
Else
 Console.WriteLine("Key = ""tif"" is not found.")
End If

// The indexer throws an exception if the requested key is
// not in the dictionary.
try
{
 Console.WriteLine("For key = \"tif\", value = {0}.",
 openWith["tif"]);
}
catch (KeyNotFoundException)
{
 Console.WriteLine("Key = \"tif\" is not found.");
}

// The indexer throws an exception if the requested key is
// not in the dictionary.
try
 printfn $"""For key = "tif", value = {openWith["tif"]}"""
with :? KeyNotFoundException ->
 printfn "Key = \"tif\" is not found."

' The default Item property throws an exception if the requested
' key is not in the dictionary.
Try
 Console.WriteLine("For key = ""tif"", value = {0}.", _
 openWith("tif"))
Catch 
 Console.WriteLine("Key = ""tif"" is not found.")
End Try

Remarks

This method approaches an O(1) operation.

See also

• ContainsValue(TValue)