Framework Core Switch

This guide provides practical approaches and tools for updating ASP. NET Framework apps to ASP. Say you have a. NET Core project that looks like this: "net40": {}, "dotnet5. 1": {} And this is your C# code: public static void Blah() #if DOTNET5_1 DoSomething(); #elif NET40 DoSomethingElse(); #endif Now, in Visual Studio when you view the. cs file, one of the #if sections will be grayed. This article provides an overview of what you should consider when porting your code from. NET Framework is relatively straightforward for many projects. The complexity of your projects dictates how much work you'll need to do. Migrating from. NET is not a single-click upgrade. It is a controlled engineering effort that succeeds when you treat it as a series of small, safe steps instead of a big rewrite. Teams that rush usually regret it. If. This is probably an old-style csproj, yes? You kinda need to convert it to new-style ("SDK" style) csproj. For simple projects, this is trivial and is usually easiest done by simply creating a new-style csproj from scratch. These apps often incorporate new technologies as they become available and are often composed of many legacy decisions. NET 10, the breaking changes listed here might affect you. Changes are grouped by technology area, such as ASP. NET Core or Windows Forms. This article categorizes each breaking change as binary incompatible or source incompatible, or as a behavioral change: Binary. [PDF]