[英]How do I write this async IO C# code in F#?
I have this code: 我有这个代码:
public async Task CreateFileAsync(string filePath, byte[] bytes)
{
using (var sourceStream = System.IO.File.Open(filePath, FileMode.OpenOrCreate))
{
sourceStream.Seek(0, SeekOrigin.End);
await sourceStream.WriteAsync(bytes, 0, bytes.Length).ConfigureAwait(false);
}
}
I want to write it on F#, I get as far as this before I can't figure out what to do: 我想在F#上写它,在我无法弄清楚该怎么做之前我得到了这个:
module myModule
open System.IO;
let CreateFileAsync (filePath: string, bytes : byte[]) =
use sourceStream = File.Open(filePath, FileMode.OpenOrCreate)
|> sourceStream.Seek(0, SeekOrigin.End);
I have searched around but there are a couple of concepts here and I can't put them all together. 我已经四处寻找,但这里有几个概念,我不能把它们放在一起。
You can use the async { .. }
workflow: 您可以使用async { .. }
工作流程:
let createFileAsync (filePath, bytes) = async {
use sourceStream = System.IO.File.Open(filePath, FileMode.OpenOrCreate)
sourceStream.Seek(0, SeekOrigin.End)
do! sourceStream.AsyncWrite(bytes, 0, bytes.Length) }
This is fairly imperative code, so it does not look very different in F#. 这是相当迫切的代码,因此它在F#中看起来并没有什么不同。
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