- Jetbrains annotations how to#
- Jetbrains annotations code#
- Jetbrains annotations series#
Scalability: if the repository method requires extra parameters not coming from the presentation layer, all the VMs using the use case won’t need to be updated because they are protected by the use case interface.
Jetbrains annotations how to#
And many, many more! Do check our web help for a full overview of all available annotations and examples of how to use them.This will prevent Rider and ReSharper from graying it out because it looks unused.
Jetbrains annotations code#
PublicAPI indicates a method is exposed as a public API, and therefore marked as “used” by code analysis. Pure indicates that a method does not make any observable state changes, ensuring callers that there will be no side effects from calling that method. The annotation not only allows to find places where return values are ignored, it also makes some analyses more precise. ContractAnnotation describes the relation between method input and output, for example by telling Rider and ReSharper that when a null value is passed, a null value will be returned. The RegexPattern annotation makes a field, property or parameter a regular expression, providing syntax highlighting, code completion and validation of our regular expression. NotifyPropert圜hangedInvocator is great when writing a class that implements the INotifyPropert圜hanged interface and opens access to a number of additional context actions on properties (such as automatically creating a backing field and adding change notification. There are many more annotations we can use to make Rider and ReSharper better at helping us. The PathReference annotation also provides navigation to the specified path! Paths can be relative or absolute, starting from the web root ( ~). When annotating a class member (such as a property) or a method parameter with PathReference, we will get code completion for files and folders within our project. All of a sudden, we get syntax highlighting, code analysis and code completion for the placeholders, including formatting!įile-system completion with PathReference When we use the annotation, Rider and ReSharper will know our method takes a composite format string, followed by arguments that will replace the placeholders in the format string. Using the StringFormatMethod annotation, we can indicate that a method works similar to the string.Format method. Better string formatting with with StringFormatMethod We can use the ItemCanBeNull/ ItemNotNull annotations with implementations of IEnumerable, Task and Lazy classes to indicate that the value of a collection item, of the Task.Result property or of the Lazy.Value property can or can never be null. Rider and ReSharper will add when we use the ? type assist, and when using the ! type assist: Writing the full name of the attribute can be cumbersome. Rider and ReSharper will then warn us if we pass an invalid value: Similarly we can annotate method parameters with these attributes – either manually or when using the Check parameter for null quick fix (via Alt+Enter). By decorating it with the attribute, Rider and ReSharper will inform us the null check is always true (and hence, redundant): Our GetGuidString() method always returns a value, so the guidString != null is redundant. Static string GetGuidString() => Guid.NewGuid().ToString() Rider and ReSharper perform value analysis to help us in detecting possible null references, redundant comparisons and null checks. Jetbrains annotations series#
We started our series with some ASP.NET MVC annotations (of which there are many more). Rider and ReSharper support a large number of annotations – let’s look at a few interesting examples.īetter null safety with CanBeNull/ NotNull/ ItemCanBeNull/ ItemNotNull
Better null checks, string formatting and path completion with JetBrains Annotations. What are JetBrains Annotations – and how to get them?. 
Improving Rider and ReSharper code analysis using JetBrains Annotations.In the previous blog post of our series around using JetBrains Annotations to improve Rider (and ReSharper’s) code analysis, code completion and navigation, we looked at some background: what are these annotations? And how do we add them to our source code? Now that we have them added to our code, we can look at some examples! File-system completion with PathReference.Better string formatting with with StringFormatMethod.
Better null safety with CanBeNull/NotNull/ItemCanBeNull/ItemNotNull.
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