.Net Framework 4.5 was installed on my machine and on the IIS Application Pool, I set the .NET CLR version to 4.0.
The AppPool’s .NET CLR Version is different from the .NET Framework Version.
The AppPool’s .NET CLR Version is different from the .NET Framework Version.
The .NET CLR Version 4.0 is the CLR base for the following .NET Framework Versions:
- 4
- 4.5 (including 4.5.1 and 4.5.2)
- 4.6 (including 4.6.1 and 4.6.2 Preview)
So having a .NET CLR Version of 4.0 just means you support the above Frameworks, which will run under their deployed framework version.
Source: https://learn.microsoft.com/en-us/dotnet/standard/clr#clr-versions
Here is a full mapping of CLR to .NET Framework versions, based off this official documentation. https://learn.microsoft.com/en-us/dotnet/framework/migration-guide/versions-and-dependencies#version-information
CLR 1.0
.NET Framework 1.0
CLR 1.1
.NET Framework 1.1
CLR 2.0
.NET Framework 2.0
.NET Framework 3.0
.NET Framework 3.5
CLR 4
.NET Framework 4
.NET Framework 4.5
.NET Framework 4.5.1
.NET Framework 4.5.2
.NET Framework 4.6
.NET Framework 4.6.1
.NET Framework 4.6.2
.NET Framework 4.7
.NET Framework 4.7.1
.NET Framework 4.7.2
.NET Framework 4.8
Reference
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