Would it support .Net Framework?

[historypz]

We intend to integrate MCP client into an old project based [on .Net Framework 4.5]. However, there are many features in the C# SDK that we can't apply.
For instance, when we try to new a StdioClientTransportOptions object, it complains that StdioClientTransportOptions.StdioClientTransportOptions() is obsolete, with the error message "Constructors of types with required members are not supported in this version of your compiler."

There should be many legacy projects that need to integrate MCP. It is hoped that the provided SDK can be compatible with low version of .Net Framework.

[stephentoub]

It does work with .NET Framework. If you're getting that error, you're using a really old compiler and will need to move to a newer one.

.Net Framework 4.5

.NET Framework 4.5 went out of support almost ten years ago. You should upgrade to a newer version.
https://learn.microsoft.com/en-us/lifecycle/products/microsoft-net-framework