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I have a windows service that I have inherited from another developer, it runs very slow and has numerous slow call to the eBay API. I wish to speed it up without too much refactoring.
I've just started to look at using c# async/await to try to get some of these slow call to run async. Here's what i'm trying to achieve:
I have a 1 very busy method that makes lots of calls as below:
getProducts getCategories getVehicles getImages My thoughts were that I could simply change the methods to async and add Task<T> to the return type as below:
public async Task<String> ProcessAdditionalProductDetialsAsync(ItemType oItem) { String additionalProductDetails = string.Empty; if (oItem.ItemSpecifics.Count > 0) { foreach (NameValueListType nvl in oItem.ItemSpecifics) { if (nvl.Value.Count > 0) { foreach (string s in nvl.Value) { additionalProductDetails += "<li><strong>" + nvl.Name + ":</strong> " + s + "</li>"; } } } } return additionalProductDetails; } Then call them with await:
Task<String> additionalProductDetials = ebayPartNumbers.ProcessAdditionalProductDetialsAsync(item); Task<PartNumberCollection> partNumberCollection = ebayPartNumbers.ProcessPartNumbersAsync(item); await Task.WhenAll(partNumberCollection, additionalProductDetials); How do I get hold of the returned types so I can use them? I have tried just using partNumberCollection but it only has the await properties available.
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To return values from async functions using async-await from function with JavaScript, we return the resolve value of the promise. const getData = async () => { return await axios.
Async functions always return a promise. If the return value of an async function is not explicitly a promise, it will be implicitly wrapped in a promise. Note: Even though the return value of an async function behaves as if it's wrapped in a Promise.resolve , they are not equivalent.
Using return await inside an async function keeps the current function in the call stack until the Promise that is being awaited has resolved, at the cost of an extra microtask before resolving the outer Promise.
Inside an async function, you can use the await keyword before a call to a function that returns a promise. This makes the code wait at that point until the promise is settled, at which point the fulfilled value of the promise is treated as a return value, or the rejected value is thrown.
Use Result property on Task class:
await Task.WhenAll(partNumberCollection, additionalProductDetials); var partNumberCollectionResult = partNumberCollection.Result; var additionalProductDetialsResult = additionalProductDetials.Result; If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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