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? When a string key is looked up in a Dictionary, it must be hashed and compared. Logically a shorter string key should be faster, as less data is being tested. Version 1: This code looks up a short string key in the Dictionary—each lookup is just 4 chars. Version 2: Here we look up a string key that is longer. Each lookup succeeds (in the same. How to find a key in a Dictionary with C#. The ContainsKey method checks if a key already exists in the dictionary.
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Definition
Adds a key/value pair to the ConcurrentDictionary if the key does not already exist, or updates a key/value pair in the ConcurrentDictionary if the key already exists.
Overloads
| AddOrUpdate(TKey, Func, Func) | Uses the specified functions to add a key/value pair to the ConcurrentDictionary if the key does not already exist, or to update a key/value pair in the ConcurrentDictionary if the key already exists. |
| AddOrUpdate(TKey, TValue, Func) | Adds a key/value pair to the ConcurrentDictionary if the key does not already exist, or updates a key/value pair in the ConcurrentDictionary by using the specified function if the key already exists. |
| AddOrUpdate(TKey, Func, Func, TArg) | Uses the specified functions and argument to add a key/value pair to the ConcurrentDictionary if the key does not already exist, or to update a key/value pair in the ConcurrentDictionary if the key already exists. |
Examples
The following example shows how to call the AddOrUpdate method:
AddOrUpdate(TKey, Func, Func)
Uses the specified functions to add a key/value pair to the ConcurrentDictionary if the key does not already exist, or to update a key/value pair in the ConcurrentDictionary if the key already exists.
Parameters
- key
- TKey
The key to be added or whose value should be updated
- addValueFactory
- Func
The function used to generate a value for an absent key
- updateValueFactory
- Func
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
Definition
Adds a key/value pair to the ConcurrentDictionary if the key does not already exist, or updates a key/value pair in the ConcurrentDictionary if the key already exists.
Overloads
| AddOrUpdate(TKey, Func, Func) | Uses the specified functions to add a key/value pair to the ConcurrentDictionary if the key does not already exist, or to update a key/value pair in the ConcurrentDictionary if the key already exists. |
| AddOrUpdate(TKey, TValue, Func) | Adds a key/value pair to the ConcurrentDictionary if the key does not already exist, or updates a key/value pair in the ConcurrentDictionary by using the specified function if the key already exists. |
| AddOrUpdate(TKey, Func, Func, TArg) | Uses the specified functions and argument to add a key/value pair to the ConcurrentDictionary if the key does not already exist, or to update a key/value pair in the ConcurrentDictionary if the key already exists. |
Examples
The following example shows how to call the AddOrUpdate method:
AddOrUpdate(TKey, Func, Func)
Uses the specified functions to add a key/value pair to the ConcurrentDictionary if the key does not already exist, or to update a key/value pair in the ConcurrentDictionary if the key already exists.
Parameters
- key
- TKey
The key to be added or whose value should be updated
- addValueFactory
- Func
The function used to generate a value for an absent key
- updateValueFactory
- Func
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.
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 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 class.
See also
AddOrUpdate(TKey, TValue, Func)
Adds a key/value pair to the ConcurrentDictionary if the key does not already exist, or updates a key/value pair in the ConcurrentDictionary 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
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 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 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 class.
See also
AddOrUpdate(TKey, Func, Func, TArg)
Uses the specified functions and argument to add a key/value pair to the ConcurrentDictionary if the key does not already exist, or to update a key/value pair in the ConcurrentDictionary if the key already exists.
Type Parameters
- TArg
The type of an argument to pass into addValueFactory and updateValueFactory.
Parameters
- key
- TKey
The key to be added or whose value should be updated.
- addValueFactory
- Func
The function used to generate a value for an absent key.
- updateValueFactory
- Func
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.
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.
For modifications and write operations to the dictionary, ConcurrentDictionary 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 class.
Applies to
-->A Dictionary contains a collection of key/value pairs. Its Add method takes two parameters, one for the key and one for the value. One way to initialize a Dictionary, or any collection whose Add method takes multiple parameters, is to enclose each set of parameters in braces as shown in the following example. Another option is to use an index initializer, also shown in the following example.
Example
C Generate Key Not In Dictionary Crossword
In the following code example, a Dictionary is initialized with instances of type StudentName. The first initialization uses the Add method with two arguments. The compiler generates a call to Add for each of the pairs of int keys and StudentName values. The second uses a public read / write indexer method of the Dictionary class:
Note the two pairs of braces in each element of the collection in the first declaration. The innermost braces enclose the object initializer for the StudentName, and the outermost braces enclose the initializer for the key/value pair that will be added to the studentsDictionary. Finally, the whole collection initializer for the dictionary is enclosed in braces. In the second initialization, the left side of the assignment is the key and the right side is the value, using an object initializer for StudentName.
Generate Dictionary Python
See also
