本文介绍了结合 F# 异步函数的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我在这里有点沮丧.我知道我已经掌握了所有的部分,但我不知道如何组合它们...
I'm a bit frustrated here. I know I've got all the bits, but I can't work out how to combine them...
let saveImageToDisk path content =
async {
use s = new FileStream(path, FileMode.OpenOrCreate)
do! s.AsyncWrite(content)
printfn "Done writing %A" path
} // returns Async<unit>
let getImages imageUrls =
imageUrls
|> Seq.map (fun url -> topath url, getImage url)
//Next line not happy because content is Async<byte[]> instead of byte[]
|> Seq.map (fun (path, content) -> saveImageToDisk path content)
|> Async.Parallel
|> Async.RunSynchronously
推荐答案
您可以使用 async
表达式将两者结合起来:
You can combine the two using the async
expression:
let getImages imageUrls =
imageUrls
|> Seq.map (fun url -> async {
let! content = getImage url
return! saveImageToDisk (topath url) content })
|> Async.Parallel
|> Async.RunSynchronously
这篇关于结合 F# 异步函数的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!