{"id":487709,"date":"2024-07-02T14:19:49","date_gmt":"2024-07-02T13:19:49","guid":{"rendered":"https:\/\/blog.jetbrains.com\/?post_type=dotnet&p=487709"},"modified":"2024-07-02T15:55:14","modified_gmt":"2024-07-02T14:55:14","slug":"how-to-use-the-tasks-view-in-jetbrains-rider","status":"publish","type":"dotnet","link":"https:\/\/blog.jetbrains.com\/zh-hans\/dotnet\/2024\/07\/02\/how-to-use-the-tasks-view-in-jetbrains-rider","title":{"rendered":"How to use the Tasks View in JetBrains Rider"},"content":{"rendered":"\n

The Task Parallel Library (TPL) is foundational to all .NET applications, as it allows frameworks to write and execute multithreaded and parallel code. Additionally, developers looking to get the most out of their resources may want to write custom code, taking advantage of the types found in System.Threading<\/code> and System.Threading.Tasks<\/code>. You must understand concurrency and threading fundamentals to write fast and scalable solutions, including locks, deadlocks, awaits, and scheduling. Part of expanding your understanding of these concepts requires excellent tooling to help you visualize and make sense of a potentially chaotic swarm of executing tasks.<\/p>\n\n\n\n

Exciting news! We’ve recently launched the first iteration of our Tasks view, a powerful tool designed to help you understand the existing tasks in the current application process. <\/p>\n\n\n\n

In this post, we’ll examine the new tool window, discuss its essential UI elements, and demonstrate some common scenarios. You’ll be ready to explore your code bases and uncover optimization opportunities by the end.<\/p>\n\n\n

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\n Download & try JetBrains Rider<\/a>\n <\/div>\n <\/div>\n\n\n\n\n\n\n\n

Task Execution in .NET Applications<\/h2>\n\n\n\n

In .NET, Tasks offer an abstraction over concepts like concurrency and multithreading. The idea is to worry less about CPU cores and threads and deal with the high-level concepts of scheduling and executing work concurrently. This is generally great since it can help developers write more imperative code while efficiently utilizing all their system resources.<\/p>\n\n\n\n

While abstractions are reasonably good, no abstraction is perfect, and at some point, you’ll have to deal with the pitfalls of multiple tasks concurrently. These include deadlocks, race conditions, and inefficient scheduling that causes backpressure. Dealing with abstractions doesn’t mean you should not understand how and why they work.<\/p>\n\n\n\n

Typically, you will be responsible for scheduling tasks but never know when and how those tasks will be completed. Execution is the job of the .NET runtime. While you might see particular code patterns that are a sign of trouble to come, the best way to diagnose issues with Tasks is at runtime. Let’s look at some common scenarios you might uncover in your codebase and see how the Tasks view can help you better understand your applications.<\/p>\n\n\n\n

Common Tasks<\/h2>\n\n\n\n

The most likely scenario when working with tasks is consuming an API that returns tasks that require the async<\/code> and await<\/code> keywords. These asynchronous APIs are in ASP.NET Core, MAUI, and Entity Framework Core. Many open-source projects have also moved to async-first APIs to support developer needs.<\/p>\n\n\n\n

Let’s take a look at a simple example.<\/p>\n\n\n

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await<\/span> BasicWork<\/span>();\r\n\r\nasync<\/span> Task<\/span> BasicWork<\/span>()\r\n{\r\n    await<\/span> Task<\/span>.<\/span>Delay<\/span>(TimeSpan<\/span>.<\/span>FromSeconds<\/span>(1<\/span>));\r\n    Console<\/span>.<\/span>WriteLine<\/span>(\"? Hello Tasks View!\"<\/span>);\r\n}\r\n<\/code><\/pre>\n                
Copy to clipboard<\/div><\/div>\n            <\/div>\n            \n\n\n\n\n\n\n
In this example, we have two tasks: The main task originating from our program and the BasicWork<\/code> method. We can confirm this by using the new Tasks View. While in a debugging session, click the Tasks<\/b> tab to view the following table.<\/p>\n\n\n
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JetBrains Rider\u2019s Tasks View in Table mode<\/figcaption><\/figure><\/div>\n\n\n
You can also switch to a Graph<\/b> view by choosing the option at the top right.<\/p>\n\n\n
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JetBrains Rider\u2019s Tasks View in Graph mode<\/figcaption><\/figure><\/div>\n\n\n
You can also see the row information in the graph view by hovering over any stack item.<\/p>\n\n\n
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Showing the row in the graph view<\/figcaption><\/figure><\/div>\n\n\n
When working with Tasks, there are five statuses<\/b> any task can have at any one time:<\/p>\n\n\n\n