Attachment.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / Net / System / Net / Mail / Attachment.cs / 1 / Attachment.cs
                        

                        
                            using System; 
using System.IO;
using System.Net.Mime;
using System.Text;
using System.Runtime.Versioning; 

namespace System.Net.Mail 
{ 
    public abstract class AttachmentBase : IDisposable
    { 
        internal bool disposed = false;
        MimePart part = new MimePart();

        internal AttachmentBase(){ 
        }
 
        [ResourceExposure(ResourceScope.Machine)] 
        [ResourceConsumption(ResourceScope.Machine)]
        protected AttachmentBase(string fileName) { 
            SetContentFromFile(fileName, String.Empty);
        }

        [ResourceExposure(ResourceScope.Machine)] 
        [ResourceConsumption(ResourceScope.Machine)]
        protected AttachmentBase(string fileName, string mediaType) { 
            SetContentFromFile(fileName, mediaType); 
        }
 
        [ResourceExposure(ResourceScope.Machine)]
        [ResourceConsumption(ResourceScope.Machine)]
        protected AttachmentBase(string fileName, ContentType contentType) {
            SetContentFromFile(fileName, contentType); 
        }
 
        protected AttachmentBase(Stream contentStream) { 
            part.SetContent(contentStream);
        } 

        protected AttachmentBase(Stream contentStream, string mediaType) {
            part.SetContent(contentStream, null, mediaType);
        } 

        internal AttachmentBase(Stream contentStream, string name, string mediaType) { 
            part.SetContent(contentStream, name, mediaType); 
        }
 
        protected AttachmentBase(Stream contentStream, ContentType contentType) {
            part.SetContent(contentStream, contentType);
        }
 
        public void Dispose()
        { 
            Dispose(true); 
        }
 
        protected virtual void Dispose(bool disposing)
        {
            if (disposing && !disposed)
            { 
                disposed = true;
                part.Dispose(); 
            } 
        }
 
        internal static string ShortNameFromFile(string fileName) {
            string name;
            int start = fileName.LastIndexOfAny(new char[] { '\\', ':' }, fileName.Length - 1, fileName.Length);
 
            if (start > 0) {
                name = fileName.Substring(start + 1, fileName.Length - start - 1); 
            } 
            else {
                name = fileName; 
            }
            return name;
        }
 
        [ResourceExposure(ResourceScope.Machine)]
        [ResourceConsumption(ResourceScope.Machine)] 
        internal void SetContentFromFile(string fileName, ContentType contentType) { 
            if (fileName == null) {
                throw new ArgumentNullException("fileName"); 
            }

            if (fileName == String.Empty)
            { 
                throw new ArgumentException(SR.GetString(SR.net_emptystringcall,"fileName"), "fileName");
            } 
 
            Stream stream = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.Read);
            part.SetContent(stream, contentType); 
        }


        [ResourceExposure(ResourceScope.Machine)] 
        [ResourceConsumption(ResourceScope.Machine)]
        internal void SetContentFromFile(string fileName, string mediaType) { 
            if (fileName == null) { 
                throw new ArgumentNullException("fileName");
            } 

            if (fileName == String.Empty)
            {
                throw new ArgumentException(SR.GetString(SR.net_emptystringcall,"fileName"), "fileName"); 
            }
 
            Stream stream = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.Read); 
            part.SetContent(stream,null,mediaType);
        } 

        internal void SetContentFromString(string contentString, ContentType contentType) {
            if (contentString == null) {
                throw new ArgumentNullException("content"); 
            }
 
            if (part.Stream != null) { 
                part.Stream.Close();
            } 

            Encoding encoding;

            if (contentType != null && contentType.CharSet != null) { 
                encoding = Text.Encoding.GetEncoding(contentType.CharSet);
            } 
            else{ 
                if (MimeBasePart.IsAscii(contentString,false)) {
                    encoding = Text.Encoding.ASCII; 
                }
                else {
                    encoding = Text.Encoding.GetEncoding(MimeBasePart.defaultCharSet);
                } 
            }
            byte[] buffer = encoding.GetBytes(contentString); 
            part.SetContent(new MemoryStream(buffer),contentType); 

 
            if (MimeBasePart.ShouldUseBase64Encoding(encoding)){
                part.TransferEncoding = TransferEncoding.Base64;
            }
            else{ 
                part.TransferEncoding = TransferEncoding.QuotedPrintable;
            } 
        } 

        internal void SetContentFromString(string contentString, Encoding encoding, string mediaType) { 
            if (contentString == null) {
                throw new ArgumentNullException("content");
            }
 
            if (part.Stream != null) {
                part.Stream.Close(); 
            } 

            if (mediaType == null || mediaType == string.Empty) { 
                mediaType = MediaTypeNames.Text.Plain;
            }

            //validate the mediaType 
            int offset = 0;
            try{ 
                string value = MailBnfHelper.ReadToken(mediaType, ref offset, null); 
                if (value.Length == 0 || offset >= mediaType.Length || mediaType[offset++] != '/')
                   throw new ArgumentException(SR.GetString(SR.MediaTypeInvalid), "mediaType"); 
                value = MailBnfHelper.ReadToken(mediaType, ref offset, null);
                if(value.Length == 0 || offset < mediaType.Length){
                    throw new ArgumentException(SR.GetString(SR.MediaTypeInvalid), "mediaType");
                } 
            }
            catch(FormatException){ 
                throw new ArgumentException(SR.GetString(SR.MediaTypeInvalid), "mediaType"); 
            }
 

            ContentType contentType = new ContentType(mediaType);

            if (encoding == null){ 
                if (MimeBasePart.IsAscii(contentString,false)) {
                    encoding = Text.Encoding.ASCII; 
                } 
                else {
                    encoding = Text.Encoding.GetEncoding(MimeBasePart.defaultCharSet); 
                }
            }

            contentType.CharSet = encoding.BodyName; 
            byte[] buffer = encoding.GetBytes(contentString);
            part.SetContent(new MemoryStream(buffer),contentType); 
 
            if (MimeBasePart.ShouldUseBase64Encoding(encoding)){
                part.TransferEncoding = TransferEncoding.Base64; 
            }
            else{
                part.TransferEncoding = TransferEncoding.QuotedPrintable;
            } 
        }
 
 
        internal virtual void PrepareForSending(){
            part.ResetStream(); 
        }

        public Stream ContentStream {
            get { 
                if (disposed) {
                    throw new ObjectDisposedException(this.GetType().FullName); 
                } 

                return part.Stream; 
            }
        }

        public string ContentId 
        {
            get 
            { 
                string cid = part.ContentID;
                if (string.IsNullOrEmpty(cid)) 
                {
                    cid = Guid.NewGuid().ToString();
                    ContentId = cid;
                    return cid; 
                }
                if (cid.Length >= 2 && cid[0] == '<' && cid[cid.Length - 1] == '>') 
                { 
                    return cid.Substring(1, cid.Length - 2);
                } 
                return cid;
            }

            set 
            {
                if (string.IsNullOrEmpty(value)) 
                { 
                    part.ContentID = null;
                } 
                else
                {
                    if(value.IndexOfAny(new char[] { '<', '>' }) != -1)
                    { 
                        throw new ArgumentException(SR.GetString(SR.MailHeaderInvalidCID), "value");
                    } 
 
                    part.ContentID = "<" + value + ">";
                } 
            }
        }

        public ContentType ContentType { 
            get {
                return part.ContentType; 
            } 

            set { 
                part.ContentType = value;
            }
        }
 
        public TransferEncoding TransferEncoding {
            get { 
                return part.TransferEncoding; 
            }
            set { 
                part.TransferEncoding = value;
            }
        }
 
        internal Uri ContentLocation
        { 
            get 
            {
                Uri uri; 
                if (!Uri.TryCreate(part.ContentLocation, UriKind.RelativeOrAbsolute, out uri))
                {
                    return null;
                } 
                return uri;
            } 
 
            set
            { 
                part.ContentLocation = value == null ? null : value.IsAbsoluteUri ? value.AbsoluteUri : value.OriginalString;
            }
        }
 
        internal MimePart MimePart {
            get { 
                return part; 
            }
        } 
    }

    public class Attachment : AttachmentBase
    { 

 
        string name; 
        Encoding nameEncoding;
 
        internal Attachment(){
        }

        [ResourceExposure(ResourceScope.Machine)] 
        [ResourceConsumption(ResourceScope.Machine)]
        public Attachment(string fileName) :base(fileName) 
        { 
            Name = ShortNameFromFile(fileName);
        } 

        [ResourceExposure(ResourceScope.Machine)]
        [ResourceConsumption(ResourceScope.Machine)]
        public Attachment(string fileName, string mediaType) : 
            base(fileName, mediaType)
        { 
            Name = ShortNameFromFile(fileName); 
        }
 
        [ResourceExposure(ResourceScope.Machine)]
        [ResourceConsumption(ResourceScope.Machine)]
        public Attachment(string fileName, ContentType contentType) :
            base(fileName, contentType) 
        {
            if (contentType.Name == null || contentType.Name == String.Empty) { 
                Name = ShortNameFromFile(fileName); 
            }
            else{ 
                Name = contentType.Name;
            }
        }
 
        public Attachment(Stream contentStream, string name) :
            base(contentStream, null, null) 
        { 
            Name = name;
        } 

        public Attachment(Stream contentStream, string name, string mediaType) :
            base(contentStream, null, mediaType)
        { 
            Name = name;
        } 
 
        public Attachment(Stream contentStream, ContentType contentType) :
            base(contentStream, contentType) 
        {
            Name = contentType.Name;
        }
 

 
        internal void SetContentTypeName(){ 
            if (name != null && name.Length != 0 && !MimeBasePart.IsAscii(name,false)) {
                Encoding encoding = NameEncoding; 
                if(encoding == null){
                    encoding = Encoding.GetEncoding(MimeBasePart.defaultCharSet);
                }
                MimePart.ContentType.Name = MimeBasePart.EncodeHeaderValue(name, encoding ,MimeBasePart.ShouldUseBase64Encoding(encoding)); 
            }
            else{ 
                MimePart.ContentType.Name = name; 
            }
        } 


        public string Name {
            get { 
                return name;
            } 
            set { 
                Encoding nameEncoding = MimeBasePart.DecodeEncoding(value);
                if(nameEncoding != null){ 
                    this.nameEncoding = nameEncoding;
                    this.name = MimeBasePart.DecodeHeaderValue(value);
                    MimePart.ContentType.Name = value;
                } 
                else{
                    this.name = value; 
                    SetContentTypeName(); 
                }
            } 
        }


        public Encoding NameEncoding { 
            get {
                return nameEncoding; 
            } 
            set {
                nameEncoding = value; 
                if(name != null && name != String.Empty){
                    SetContentTypeName();
                }
            } 
        }
 
 

        public ContentDisposition ContentDisposition 
        {
            get
            {
                ContentDisposition disp = MimePart.ContentDisposition; 
                if (disp == null)
                { 
                    disp = new ContentDisposition(); 
                    MimePart.ContentDisposition = disp;
                } 
                return disp;
            }
        }
 

        internal override void PrepareForSending(){ 
            if(name != null && name != String.Empty){ 
                SetContentTypeName();
            } 
            base.PrepareForSending();
        }

        public static Attachment CreateAttachmentFromString(string content, string name){ 
            Attachment a = new Attachment();
            a.SetContentFromString(content,null, String.Empty); 
            a.Name = name; 
            return a;
        } 

        public static Attachment CreateAttachmentFromString(string content, string name, Encoding contentEncoding, string mediaType){
            Attachment a = new Attachment();
            a.SetContentFromString(content, contentEncoding, mediaType); 
            a.Name = name;
            return a; 
        } 

        public static Attachment CreateAttachmentFromString(string content, ContentType contentType){ 
            Attachment a = new Attachment();
            a.SetContentFromString(content, contentType);
            a.Name = contentType.Name;
            return a; 
        }
    } 
}

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