<PackageReference Include="NETStandard.Library" Version="2.0.3" />

System.Net.Mail.AlternateView

public class AlternateView : AttachmentBase
namespace System.Net.Mail { public class AlternateView : AttachmentBase { public Uri BaseUri { get; set; } public LinkedResourceCollection LinkedResources { get; } public AlternateView(Stream contentStream); public AlternateView(Stream contentStream, ContentType contentType); public AlternateView(Stream contentStream, string mediaType); public AlternateView(string fileName); public AlternateView(string fileName, ContentType contentType); public AlternateView(string fileName, string mediaType); public static AlternateView CreateAlternateViewFromString(string content); public static AlternateView CreateAlternateViewFromString(string content, ContentType contentType); public static AlternateView CreateAlternateViewFromString(string content, Encoding contentEncoding, string mediaType); } }