I come across the following warning during working on one of my projects. I looked at the internet and it seems this is very common so I thought I’ll add notes to resolve it. This warning could be dangerous and result in a logical error or fairly pointless. So please bear with me to understand the concept. <\/p>\n\n\n\n
CS 1998 This async method lacks ‘await’ operators and will run synchronously. Consider using the ‘await’ operator to await non-blocking API calls, or ‘await Task.Run(\u2026)’ to do CPU-bound work on a background thread.<\/p><\/blockquote>\n\n\n\n
Reason (Why)<\/h2>\n\n\n\n
Commonly it happens in places where you add the async method in your interface but your code does not actually need the async method. <\/p>\n\n\n\n
For example<\/p>\n\n\n\n
Interface<\/h3>\n\n\n\n
public interface IFoo\n{\n Task Test();\n}<\/code><\/pre>\n\n\n\nImplementation<\/h3>\n\n\n\n
public class Foo: IFoo\n{\n public async Task Test()\n {\n if (user.Username == \"test-user\")\nthrow new Exception(\"can not use test user\");\n \n }\n}<\/code><\/pre>\n\n\n\nYou can see in the above example the code is not really async but the method suppose to return the result asynchronously.<\/p>\n\n\n\n
So that’s why when you run this code you will get this warning. You can either ignore this warning or change your method not to return async.<\/p>\n\n\n\n
You need to be very careful. You might end up removing async from your method without really analysing the rest of the code can return results asynchronously.<\/p>\n\n\n\n
Solution:<\/h2>\n\n\n\n
You can add “Task.CompletedTask;<\/strong>” at the end of your task. Like below<\/p>\n\n\n\n
\n\npublic class Foo: IFoo\n{\n public async Task Test()\n {\n if (user.Username == \"test-user\")\nthrow new Exception(\"can not use test user\");\nreturn Task.CompletedTask;\n \n }\n}\n\n<\/code><\/pre>\n\n\n\nYou can suppress this warning in your project like below. If you think this is harmless<\/p>\n\n\n\n
<Project Sdk=\"Microsoft.NET.Sdk.Web\">\n <PropertyGroup>\n <NoWarn>1998<\/NoWarn>\n <\/PropertyGroup>\n...\n<\/Project><\/code><\/pre>\n\n\n\nYou can ignore this warning. If you think this is harmless<\/p>\n\n\n\n
you can also add Do nothing by adding “await Task.Yield()<\/strong>;”. But this is absolutely not recommended. <\/p>\n\n\n\n
<\/p>\n","protected":false},"excerpt":{"rendered":"
I come across the following warning during working on one of my projects. I looked at the internet and it seems this is very common…<\/p>\n","protected":false},"author":1,"featured_media":72,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[11,8,32,56],"class_list":["post-627","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-dot-net-core","tag-dot-net-core","tag-dot-net-framework","tag-developer","tag-visual-studio"],"yoast_head":"\n
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