Attachment.cs

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using System.IO;
using System.Net.Mime;
using System.Text;
 
namespace System.Net.Mail;
 
public class Attachment : AttachmentBase
{
    private string _name;
 
    private Encoding _nameEncoding;
 
    public string? Name
    {
        get
        {
            return _name;
        }
        set
        {
            Encoding encoding = MimeBasePart.DecodeEncoding(value);
            if (encoding != null)
            {
                _nameEncoding = encoding;
                _name = MimeBasePart.DecodeHeaderValue(value);
                base.MimePart.ContentType.Name = value;
            }
            else
            {
                _name = value;
                SetContentTypeName(allowUnicode: true);
            }
        }
    }
 
    public Encoding? NameEncoding
    {
        get
        {
            return _nameEncoding;
        }
        set
        {
            _nameEncoding = value;
            if (_name != null && _name != string.Empty)
            {
                SetContentTypeName(allowUnicode: true);
            }
        }
    }
 
    public ContentDisposition? ContentDisposition => base.MimePart.ContentDisposition;
 
    internal Attachment()
    {
        base.MimePart.ContentDisposition = new ContentDisposition();
    }
 
    public Attachment(string fileName)
        : base(fileName)
    {
        Name = Path.GetFileName(fileName);
        base.MimePart.ContentDisposition = new ContentDisposition();
    }
 
    public Attachment(string fileName, string? mediaType)
        : base(fileName, mediaType)
    {
        Name = Path.GetFileName(fileName);
        base.MimePart.ContentDisposition = new ContentDisposition();
    }
 
    public Attachment(string fileName, ContentType contentType)
        : base(fileName, contentType)
    {
        if (string.IsNullOrEmpty(contentType.Name))
        {
            Name = Path.GetFileName(fileName);
        }
        else
        {
            Name = contentType.Name;
        }
        base.MimePart.ContentDisposition = new ContentDisposition();
    }
 
    public Attachment(Stream contentStream, string? name)
        : base(contentStream, null, null)
    {
        Name = name;
        base.MimePart.ContentDisposition = new ContentDisposition();
    }
 
    public Attachment(Stream contentStream, string? name, string? mediaType)
        : base(contentStream, null, mediaType)
    {
        Name = name;
        base.MimePart.ContentDisposition = new ContentDisposition();
    }
 
    public Attachment(Stream contentStream, ContentType contentType)
        : base(contentStream, contentType)
    {
        Name = contentType.Name;
        base.MimePart.ContentDisposition = new ContentDisposition();
    }
 
    internal void SetContentTypeName(bool allowUnicode)
    {
        if (!allowUnicode && _name != null && _name.Length != 0 && !MimeBasePart.IsAscii(_name, permitCROrLF: false))
        {
            Encoding encoding = NameEncoding ?? Encoding.GetEncoding("utf-8");
            base.MimePart.ContentType.Name = MimeBasePart.EncodeHeaderValue(_name, encoding, MimeBasePart.ShouldUseBase64Encoding(encoding));
        }
        else
        {
            base.MimePart.ContentType.Name = _name;
        }
    }
 
    internal override void PrepareForSending(bool allowUnicode)
    {
        if (_name != null && _name != string.Empty)
        {
            SetContentTypeName(allowUnicode);
        }
        base.PrepareForSending(allowUnicode);
    }
 
    public static Attachment CreateAttachmentFromString(string content, string? name)
    {
        Attachment attachment = new Attachment();
        attachment.SetContentFromString(content, null, string.Empty);
        attachment.Name = name;
        return attachment;
    }
 
    public static Attachment CreateAttachmentFromString(string content, string? name, Encoding? contentEncoding, string? mediaType)
    {
        Attachment attachment = new Attachment();
        attachment.SetContentFromString(content, contentEncoding, mediaType);
        attachment.Name = name;
        return attachment;
    }
 
    public static Attachment CreateAttachmentFromString(string content, ContentType contentType)
    {
        Attachment attachment = new Attachment();
        attachment.SetContentFromString(content, contentType);
        attachment.Name = contentType.Name;
        return attachment;
    }
}