Therefore, the cost of developing a standard set for a single organization was quite high because it involved starting with a clean sheet of paper. At the time, there had been little progress in developing a standard set of data element definitions that could be shared by various organizations. In some cases, there were valid reasons that two different systems used different definitions for the same data element. There are additional restraining forces in this figure. Force field analysis for adopting standard data element definitions. * This code example produces the following output:Īn element with Key = "txt" already exists.Figure 5.3. Use the Remove method to remove a key/value pair.Ĭonsole::WriteLine("Key \"doc\" is not found.") with the type that was specified for dictionary keys. The elements of the Ke圜ollection are strongly typed To get the keys alone, use the Keys property. with the type that was specified for dictionary values. The elements of the ValueCollection are strongly typed To get the values alone, use the Values property. can omit its name when accessing elements.Ĭonsole::WriteLine("For key = \"rtf\", value = ", The Item property is another name for the indexer, so you The Add method throws an exception if the new key isĬonsole::WriteLine("An element with Key = \"txt\" already exists.") duplicate keys, but some of the values are duplicates. Create a new dictionary of strings, with string keys. Using namespace System::Collections::Generic The example shows how to enumerate the keys and values in the dictionary and how to enumerate the keys and values alone using the Keys property and the Values property.įinally, the example demonstrates the Remove method. The example shows how to use the TryGetValue method as a more efficient way to retrieve values if a program often must try key values that are not in the dictionary, and it shows how to use the ContainsKey method to test whether a key exists before calling the Add method. The example uses the Item property (the indexer in C#) to retrieve values, demonstrating that a KeyNotFoundException is thrown when a requested key is not present, and showing that the value associated with a key can be replaced. The example demonstrates that the Add method throws an ArgumentException when attempting to add a duplicate key. The following code example creates an empty Dictionary of strings with string keys and uses the Add method to add some elements. ICollection> IDictionary IEnumerable> IEnumerable IReadOnl圜ollection> IReadOnlyDictionary ICollection IDictionary IEnumerable IDeserializationCallback ISerializable Examples Implements ICollection(Of KeyValuePair(Of TKey, TValue)), IDeserializationCallback, IDictionary, IDictionary(Of TKey, TValue), IEnumerable(Of KeyValuePair(Of TKey, TValue)), ISerializable Type Parameters Implements ICollection(Of KeyValuePair(Of TKey, TValue)), IDeserializationCallback, IDictionary, IDictionary(Of TKey, TValue), IEnumerable(Of KeyValuePair(Of TKey, TValue)), IReadOnl圜ollection(Of KeyValuePair(Of TKey, TValue)), IReadOnlyDictionary(Of TKey, TValue), ISerializable Public Class Dictionary(Of TKey, TValue) Implements ICollection(Of KeyValuePair(Of TKey, TValue)), IDictionary, IDictionary(Of TKey, TValue), IEnumerable(Of KeyValuePair(Of TKey, TValue)), IReadOnl圜ollection(Of KeyValuePair(Of TKey, TValue)), IReadOnlyDictionary(Of TKey, TValue) Public Class Dictionary(Of TKey, TValue) Interface IReadOnl圜ollection> Public Class Dictionary(Of TKey, TValue) Interface IDeserializationCallback type Dictionary = class Interface IDictionary type Dictionary = class Public class Dictionary : >,, >, 圜ollection>,, ,, type Dictionary = class Public ref class Dictionary : System::Collections::Generic::ICollection>, System::Collections::Generic::IDictionary, System::Collections::Generic::IEnumerable>, System::Collections::IDictionary, System::Runtime::Serialization::IDeserializationCallback, System::Runtime::Serialization::ISerializable public class Dictionary : >,, >, 圜ollection>,, public class Dictionary : >,, >, 圜ollection>,, ,, Public ref class Dictionary : System::Collections::Generic::ICollection>, System::Collections::Generic::IDictionary, System::Collections::Generic::IEnumerable>, System::Collections::Generic::IReadOnl圜ollection>, System::Collections::Generic::IReadOnlyDictionary, System::Collections::IDictionary, System::Runtime::Serialization::IDeserializationCallback, System::Runtime::Serialization::ISerializable generic Public ref class Dictionary : System::Collections::Generic::ICollection>, System::Collections::Generic::IDictionary, System::Collections::Generic::IEnumerable>, System::Collections::Generic::IReadOnl圜ollection>, System::Collections::Generic::IReadOnlyDictionary, System::Collections::IDictionary generic Represents a collection of keys and values.
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