Book Image

Apps and Services with .NET 7

By : Mark J. Price
Book Image

Apps and Services with .NET 7

By: Mark J. Price

Overview of this book

Apps and Services with .NET 7 is for .NET 6 and .NET 7 developers who want to kick their C# and .NET understanding up a gear by learning the practical skills and knowledge they need to build real-world applications and services. It covers specialized libraries that will help you monitor and improve performance, secure your data and applications, and internationalize your code and apps. With chapters that put a variety of technologies into practice, including Web API, OData, gRPC, GraphQL, SignalR, and Azure Functions, this book will give you a broader scope of knowledge than other books that often focus on only a handful of .NET technologies. It covers the latest developments, libraries, and technologies that will help keep you up to date. You’ll also leverage .NET MAUI to develop mobile apps for iOS and Android as well as desktop apps for Windows and macOS.
Table of Contents (23 chapters)

Working with expression trees

Expression trees represent code as a structure that you can examine or execute. Expression trees are immutable so you cannot change one, but you can create a copy with the changes you want.

If you compare expression trees to functions, then although functions have flexibility in the parameter values passed to them, the structure of the function, what it does with those values, and how are all fixed. Expression trees provide a structure that can dynamically change, so what and how a function is implemented can be dynamically changed at runtime.

Expression trees are also used to represent an expression in an abstract way, so instead of being expressed using C# code, the expression is expressed as a data structure in memory. This then allows that data structure to be expressed in other ways, using other languages.

When you write a LINQ expression for the EF Core database provider, it is represented by an expression tree that is then translated...