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Showing content from https://learn.microsoft.com/dotnet/api/system.collections.generic.keynotfoundexception below:

KeyNotFoundException Class (System.Collections.Generic) | Microsoft Learn

KeyNotFoundException Class Definition

The exception that is thrown when the key specified for accessing an element in a collection does not match any key in the collection.

public ref class KeyNotFoundException : Exception
public ref class KeyNotFoundException : SystemException
public class KeyNotFoundException : Exception
public class KeyNotFoundException : SystemException
[System.Runtime.InteropServices.ComVisible(true)]
[System.Serializable]
public class KeyNotFoundException : SystemException
type KeyNotFoundException = class
    inherit Exception
type KeyNotFoundException = class
    inherit SystemException
type KeyNotFoundException = class
    inherit SystemException
    interface ISerializable
[<System.Runtime.InteropServices.ComVisible(true)>]
[<System.Serializable>]
type KeyNotFoundException = class
    inherit SystemException
    interface ISerializable
Public Class KeyNotFoundException
Inherits Exception
Public Class KeyNotFoundException
Inherits SystemException
Inheritance
Inheritance
Attributes
Implements

A KeyNotFoundException is thrown when an operation attempts to retrieve an element from a collection using a key that does not exist in that collection.

KeyNotFoundException uses the HRESULT COR_E_KEYNOTFOUND, which has the value 0x80131577.

For a list of initial property values for an instance of the KeyNotFoundException class, see the KeyNotFoundException constructors.

Constructors Properties Data

Gets a collection of key/value pairs that provide additional user-defined information about the exception.

(Inherited from Exception) HelpLink

Gets or sets a link to the help file associated with this exception.

(Inherited from Exception) HResult

Gets or sets HRESULT, a coded numerical value that is assigned to a specific exception.

(Inherited from Exception) InnerException

Gets the Exception instance that caused the current exception.

(Inherited from Exception) Message

Gets a message that describes the current exception.

(Inherited from Exception) Source

Gets or sets the name of the application or the object that causes the error.

(Inherited from Exception) StackTrace

Gets a string representation of the immediate frames on the call stack.

(Inherited from Exception) TargetSite

Gets the method that throws the current exception.

(Inherited from Exception) Methods Events SerializeObjectState

Obsolete.

Occurs when an exception is serialized to create an exception state object that contains serialized data about the exception.

(Inherited from Exception)

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