Support .NET 4.0 about device.net HOT 10 OPEN

@maf-soft .net only introduced async await in 4.5. I think that's the minimum.

from device.net.

I'm using it with 4.0 and Visual Studio Community 2019: https://www.nuget.org/packages/Microsoft.Bcl.Async/

i.e. await serialPort.BaseStream.ReadAsync() works well, including CancellationToken.
(But now I need USB HID, too. It's the same device, providing RS232 and USB for the same data. Unfortunately it's doesn't install a virtual com port. If there is any way to get a virtual com port for this USB device, my application could work without changes...)

from device.net.

@maf-soft fair point.

Are you interested in helping to see if it's possible to target 4.0?

I can give you a few pointers if you want to try it out.

If it works, you can submit a PR

from device.net.

Ok, I cannot invest a lot of time, but If you think it's not much effort, I can try with your pointers. Should we talk somewhere else?

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@maf-soft I think it will be possible to some extent but there is going to be a lot of fiddly work involved.

I changed the csproj file to this as an example:

<Project Sdk="Microsoft.NET.Sdk">
    <PropertyGroup>
        <TargetFrameworks>net4;</TargetFrameworks>
        <NoWarn>NU5125</NoWarn>
        <DocumentationFile>Device.Net.xml</DocumentationFile>
        <DebugType>embedded</DebugType>
    </PropertyGroup>
    <ItemGroup>
      <Compile Remove="DeviceDataStreamer.cs" />
    </ItemGroup>
    <ItemGroup>
        <None Include="..\..\README.md" Link="README.md" />
        <PackageReference Include="Microsoft.Bcl.Async" Version="1.0.168" />


		<PackageReference Include="Microsoft.CodeAnalysis.NetAnalyzers" Version="5.0.1">
            <PrivateAssets>all</PrivateAssets>
            <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
        </PackageReference>
        <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.0.0">
            <PrivateAssets>all</PrivateAssets>
            <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
        </PackageReference>
    </ItemGroup>
</Project>

These are the compilation errors I get. You would need to find more BCL libraries.

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@maf-soft
https://www.infoq.com/news/2011/10/ReadOnly-WInRT/

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@maf-soft if you want to, you can create your own equivalent interface and list implementations...

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Thanks for your investigations and the link. Let's see when I find some time to look at it.

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According to https://docs.microsoft.com/en-us/dotnet/framework/install/guide-for-developers, .net 4.0, .net 4.5 and even .net 4.5.1 are officially abandoned starting from VS2022.

from device.net.

wanted to note that .NET 4.6.2 is the earliest version that's officially supported by Microsoft as of April 26th: https://devblogs.microsoft.com/dotnet/net-framework-4-5-2-4-6-4-6-1-will-reach-end-of-support-on-april-26-2022

Customers currently using .NET Framework 4.5.2, 4.6, or 4.6.1 need to update their deployed runtime to a more recent version – at least .NET Framework 4.6.2 before April 26, 2022 – in order to continue to receive updates and technical support.

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