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<T> 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 7, Windows Vista SP2, Windows XP SP3, Windows XP x64 SP2, Windows Server 2008 R2, Windows Server 2008 SP2, Windows Server 2003 SP2
Version Information
F# Runtime
Supported in: 2.0, 4.0
Silverlight
Supported in: 3