How Can I Dynamically Determine and Use the Target Framework Version at Compile Time in C#?

Dynamically Determine Target Framework Version at Compile Time

In C# projects, developers may encounter scenarios where they need to conditionally define classes or methods based on the target framework version. One such case arises when dealing with extension methods that require specific attributes within .NET 2.0 but may not be necessary in later framework versions.

To achieve this, there exists a convenient solution using conditional compilation directives. These directives allow developers to define code blocks that are only included or excluded during compilation based on specific conditions.

In the case of detecting the target framework version, developers can utilize the TargetFrameworkVersion property within the project's csproj file. Here's how to create a conditional attribute definition for .NET 2.0 compatibility:

<Project>
  <PropertyGroup>
    <TargetFrameworkVersion>v2.0</TargetFrameworkVersion>
    <DefineConstants Condition="'$(TargetFrameworkVersion)' == 'v2.0'">ExtensionAttribute</DefineConstants>
  </PropertyGroup>

With this conditional definition, the ExtensionAttribute class can be included only when targeting .NET 2.0, avoiding compilation errors in higher framework versions. Code that utilizes the attribute would then be wrapped within #if and #endif directives:

#if ExtensionAttribute
public sealed class ExtensionAttribute : Attribute { }
#endif

By employing conditional compilation directives, developers gain the flexibility to write code that adapts seamlessly to different target framework versions, ensuring compatibility and avoiding unnecessary errors.

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