Asp.NET targetFramework版本和IIS应用程序池版本不匹配

Question

Recently I have been creating Application Pool in IIS for Asp.Net Websites. What seems surprising to me is that those App Pools were having v4.0 , while the websites were targeting .Net framework v4.5 / v4.5.1

Entry in Web.config of Individual websites:

and this is what is App Pool Settings:

Isn't it like for targetFramework="4.5", App Pool version should be 4.5, for targetFRamework="4.5.1", App Pool version should be 4.5.1 ?

Does App Pool version 4.0 handles all Web Application/Websites developed in 4.5 and 4.5.1 as well ?

Answer 1

The Application Pool displays the Asp.NET runtime versions, which you can also say as CLR versions.

With the new Asp.NET framework versions various new libraries/functionalities/features are introduced along with (possibly) new Compiler, Build Target files.

As observed from below table, there are NO new CLR versions introduced with framework versions 4.5 -> 4.5.1 ->4.5.2 ... This means any website developed using framework v4.5/v4.5.1/v4.5.2 target CLR version 4 and hence use Application Pool version 4.0

The .NET Framework versions 2.0, 3.0, and 3.5 are built with the same version of the CLR ( CLR 2.0 ). These versions represent successive layers of a single installation. Each version is built incrementally on top of the earlier versions. And therefore you will see Application Pool v2.0 for these frameworks.

In short,

Framework Version != App Pool Version

App Pool Version = CLR Version

CLR Version = Folders at location: C:\\Windows\\Microsoft.NET\\framework

The version folders at location C:\\Windows\\Microsoft.NET\\framework contains the Compiler and Target build files for Asp.NET runtime

Answer 2

是的，4.0池就像你希望的那样。