'HttpClientHandler' does not contain a definition for 'ServerCertificateValidationCal-CodePudding

I am currently in the process of migrating a huge solution from .Net Framework 4.7.2 to .Net Core 3.1. In the current Project (which now targets .Net Standard 2.0) we had the following code (already changed from WebRequestHandler):

        var handler = new HttpClientHandler
        {
            Proxy = proxy,
            UseDefaultCredentials = useDefaultCredentials,
        };

        if (Configuration.TrustCertificate)
        {
            handler.ServerCertificateValidationCallback = delegate
            {
                return true;
            };
        }

After the migration to .Net Standard 2.0 I get the following build error:

CS1061 'HttpClientHandler' does not contain a definition for 'ServerCertificateValidationCallback' and no accessible extension method 'ServerCertificateValidationCallback' accepting a first argument of type 'HttpClientHandler' could be found (are you missing a using directive or an assembly reference?)

I have referenced the nuget package System.Net.Http (v4.3.4). When I view the definition I see that the ServerCertificateValidationCallback is there but marked as [EditorBrowsable(EditorBrowsableState.Never)] The header of the file is also suspicious:

#region Assembly netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51
// C:\Users\myuser\.nuget\packages\netstandard.library\2.0.3\build\netstandard2.0\ref\netstandard.dll
#endregion

I would have expected that the class was in the System.Net.Http package.

Any ideas?

CodePudding user response：

The name of the property is ServerCertificateCustomValidationCallback. If you change the property name, the build error should be fixed.