net481 
namespace System.Diagnostics
{
    public static class TraceSourceExtensions
    {
        public static void TraceWarning(this TraceSource traceSource, string msg);
    }
}
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.NET Framework 4.54.5.14.5.24.64.6.14.6.24.74.7.14.7.24.84.8.1
Information specific to net481
Assembly

Microsoft.AspNet.SignalR.Core , Version=2.4.3.0, PublicKeyToken=31bf3856ad364e35

Referencing

Your project needs a package reference to Microsoft.AspNet.SignalR.Core.

Package Microsoft.AspNet.SignalR.Core (2.4.3) net45
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