ExtraTopLevelOperators.dict<'Key,'Value> Function (F#)
Builds a read-only lookup table from a sequence of key/value pairs. The key objects are indexed using generic hashing and equality.
Namespace/Module Path: Microsoft.FSharp.Core.ExtraTopLevelOperators
Assembly: FSharp.Core (in FSharp.Core.dll)
// Signature:
dict : seq<'Key * 'Value> -> IDictionary<'Key,'Value> (requires equality)
// Usage:
dict keyValuePairs
Parameters
- keyValuePairs
Type: seq<'Key * 'Value>
Return Value
An object that implements IDictionary<TKey, TValue> that represents the given collection.
Remarks
This function is named CreateDictionary in compiled assemblies. If you are accessing the function from a language other than F#, or through reflection, use this name.
Example
The following code example shows the use of the dict function.
open System
open System.Collections.Generic
let seq1 = seq { for i in 1..10 -> i, i*i }
let dictionary1 = dict seq1
if dictionary1.IsReadOnly then
Console.WriteLine("The dictionary is read only.")
// The type is a read only IDictionary.
// If you try to add or remove elements,
// NotSupportedException is generated, as in the following line:
//dictionary1.Add(new KeyValuePair<int, int>(0, 0))
// You can use read-only methods as in the following lines.
if dictionary1.ContainsKey(5) then
Console.WriteLine("Value for key 5: {0}", dictionary1.Item(5))
for elem in dictionary1 do
Console.WriteLine("Key: {0} Value: {1}", elem.Key, elem.Value)
The output is as follows.
The dictionary is read only. Value for key 5: 25 Key: 1 Value: 1 Key: 2 Value: 4 Key: 3 Value: 9 Key: 4 Value: 16 Key: 5 Value: 25 Key: 6 Value: 36 Key: 7 Value: 49 Key: 8 Value: 64 Key: 9 Value: 81 Key: 10 Value: 100
Platforms
Windows 8, Windows 7, Windows Server 2012, Windows Server 2008 R2
Version Information
F# Core Library Versions
Supported in: 2.0, 4.0, Portable