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A Dictionary stores Key-Value pairs where the key must be unique. Before adding a KeyValuePair into a dictionary, check that the key does not exist using the ContainsKey method. Use the TryGetValue method to get the value of a key to avoid possible runtime exceptions. Failed to generate points Error: The given key was not present in the dictionary. On the next line it says. Waiting for the new copy interval The status of the individual backups are SUCCESS. Working with Veaam Backup & Replicationb 9.5 Update 4. Any ideas here before I will call Veeam Support? The ContainsKey method checks if a key already exists in the dictionary. The following code snippet checks if a key already exits and if not, adds it. Approach #4: Unpacking with. Unpacking with. works with any object that is iterable and, since dictionaries return their keys when iterated through, you can easily create a.
Definition
Adds a key/value pair to the ConcurrentDictionary<TKey,TValue> if the key does not already exist, or updates a key/value pair in the ConcurrentDictionary<TKey,TValue> if the key already exists.
Overloads
AddOrUpdate(TKey, Func<TKey,TValue>, Func<TKey,TValue,TValue>) | Uses the specified functions to add a key/value pair to the ConcurrentDictionary<TKey,TValue> if the key does not already exist, or to update a key/value pair in the ConcurrentDictionary<TKey,TValue> if the key already exists. |
AddOrUpdate(TKey, TValue, Func<TKey,TValue,TValue>) | Adds a key/value pair to the ConcurrentDictionary<TKey,TValue> if the key does not already exist, or updates a key/value pair in the ConcurrentDictionary<TKey,TValue> by using the specified function if the key already exists. |
AddOrUpdate<TArg>(TKey, Func<TKey,TArg,TValue>, Func<TKey,TValue,TArg,TValue>, TArg) | Uses the specified functions and argument to add a key/value pair to the ConcurrentDictionary<TKey,TValue> if the key does not already exist, or to update a key/value pair in the ConcurrentDictionary<TKey,TValue> if the key already exists. |
Examples
The following example shows how to call the AddOrUpdate method:
AddOrUpdate(TKey, Func<TKey,TValue>, Func<TKey,TValue,TValue>)
Uses the specified functions to add a key/value pair to the ConcurrentDictionary<TKey,TValue> if the key does not already exist, or to update a key/value pair in the ConcurrentDictionary<TKey,TValue> if the key already exists.
Parameters
- key
- TKey
The key to be added or whose value should be updated
- addValueFactory
- Func<TKey,TValue>
The function used to generate a value for an absent key
- updateValueFactory
- Func<TKey,TValue,TValue>
The function used to generate a new value for an existing key based on the key's existing value
Returns
The new value for the key. This will be either be the result of
addValueFactory
(if the key was absent) or the result of updateValueFactory
(if the key was present).Exceptions
key
, addValueFactory
, or updateValueFactory
is null
.The dictionary contains too many elements.
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Remarks
If you call AddOrUpdate simultaneously on different threads,
addValueFactory
may be called multiple times, but its key/value pair might not be added to the dictionary for every call.For modifications and write operations to the dictionary, ConcurrentDictionary<TKey,TValue> uses fine-grained locking to ensure thread safety. (Read operations on the dictionary are performed in a lock-free manner.) However, the
addValueFactory
and updateValueFactory
delegates are called outside the locks to avoid the problems that can arise from executing unknown code under a lock. Therefore, AddOrUpdate is not atomic with regards to all other operations on the ConcurrentDictionary<TKey,TValue> class.See also
AddOrUpdate(TKey, TValue, Func<TKey,TValue,TValue>)
Adds a key/value pair to the ConcurrentDictionary<TKey,TValue> if the key does not already exist, or updates a key/value pair in the ConcurrentDictionary<TKey,TValue> by using the specified function if the key already exists.
Parameters
- key
- TKey
The key to be added or whose value should be updated
- addValue
- TValue
The value to be added for an absent key
- updateValueFactory
- Func<TKey,TValue,TValue>
The function used to generate a new value for an existing key based on the key's existing value
Returns
The new value for the key. This will be either be
addValue
(if the key was absent) or the result of updateValueFactory
(if the key was present).Exceptions
key
or updateValueFactory
is null
.The dictionary contains too many elements.
Examples
The following code example shows how to initialize an ConcurrentDictionary<TKey,TValue> and how to use the AddOrUpdate method to add an additional item to the collection, and update the existing items.
For modifications and write operations to the dictionary, ConcurrentDictionary<TKey,TValue> uses fine-grained locking to ensure thread safety. (Read operations on the dictionary are performed in a lock-free manner.) However, the
updateValueFactory
delegate is called outside the locks to avoid the problems that can arise from executing unknown code under a lock. Therefore, AddOrUpdate is not atomic with regards to all other operations on the ConcurrentDictionary<TKey,TValue> class.C Generate Key Not In Dictionary Pdf
See also
AddOrUpdate<TArg>(TKey, Func<TKey,TArg,TValue>, Func<TKey,TValue,TArg,TValue>, TArg)
Uses the specified functions and argument to add a key/value pair to the ConcurrentDictionary<TKey,TValue> if the key does not already exist, or to update a key/value pair in the ConcurrentDictionary<TKey,TValue> if the key already exists.
Type Parameters
- TArg
The type of an argument to pass into
addValueFactory
and updateValueFactory
.Parameters
- key
- TKey
![Generate Generate](/uploads/1/2/6/1/126177601/565059661.png)
The key to be added or whose value should be updated.
- addValueFactory
- Func<TKey,TArg,TValue>
The function used to generate a value for an absent key.
- updateValueFactory
- Func<TKey,TValue,TArg,TValue>
The function used to generate a new value for an existing key based on the key's existing value.
- factoryArgument
- TArg
An argument to pass into
addValueFactory
and updateValueFactory
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Returns
The new value for the key. This will be either be the result of
addValueFactory
(if the key was absent) or the result of updateValueFactory
(if the key was present).Exceptions
key
, addValueFactory
, or updateValueFactory
is a null reference (Nothing in Visual Basic).The dictionary contains too many elements.
Remarks
If you call AddOrUpdate simultaneously on different threads,
addValueFactory
may be called multiple times, but its key/value pair might not be added to the dictionary for every call.C# Foreach Key In Dictionary
For modifications and write operations to the dictionary, ConcurrentDictionary<TKey,TValue> uses fine-grained locking to ensure thread safety. (Read operations on the dictionary are performed in a lock-free manner.) However, the
addValueFactory
and updateValueFactory
delegates are called outside the locks to avoid the problems that can arise from executing unknown code under a lock. Therefore, AddOrUpdate is not atomic with regards to all other operations on the ConcurrentDictionary<TKey,TValue> class.