Seq.cast<'T> Function (F#)
Wraps a weakly typed System.Collections sequence as a typed sequence.
Namespace/Module Path: Microsoft.FSharp.Collections.Seq
Assembly: FSharp.Core (in FSharp.Core.dll)
// Signature:
Seq.cast : IEnumerable -> seq<'T>
// Usage:
Seq.cast source
Parameters
source
Type: IEnumerableThe input sequence.
Exceptions
Exception |
Condition |
|---|---|
Thrown when the input sequence is null. |
Return Value
The result sequence.
Remarks
The use of this function usually requires a type annotation. An incorrect type annotation may result in runtime type errors. Individual IEnumerator values generated from the returned sequence should not be accessed concurrently.
This function is named Cast 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 demonstrates the use of Seq.cast to convert a weakly typed ArrayList, where the element type is just Object, into a sequence of int.
open System
let mutable arrayList1 = new System.Collections.ArrayList(10)
for i in 1 .. 10 do arrayList1.Add(10) |> ignore
let seqCast : seq<int> = Seq.cast arrayList1
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