<PackageReference Include="NETStandard.Library" Version="2.0.2" />

System.Net.Mail.Attachment

public class Attachment : AttachmentBase
namespace System.Net.Mail { public class Attachment : AttachmentBase { public ContentDisposition ContentDisposition { get; } public string Name { get; set; } public Encoding NameEncoding { get; set; } public Attachment(Stream contentStream, ContentType contentType); public Attachment(Stream contentStream, string name); public Attachment(Stream contentStream, string name, string mediaType); public Attachment(string fileName); public Attachment(string fileName, ContentType contentType); public Attachment(string fileName, string mediaType); public static Attachment CreateAttachmentFromString(string content, ContentType contentType); public static Attachment CreateAttachmentFromString(string content, string name); public static Attachment CreateAttachmentFromString(string content, string name, Encoding contentEncoding, string mediaType); } }