{"id":563,"date":"2010-11-21T21:50:54","date_gmt":"2010-11-21T19:50:54","guid":{"rendered":"http:\/\/dev.bratched.fr\/fr\/telechargement-de-plusieurs-fichiers-avec-c\/"},"modified":"2010-11-21T21:50:54","modified_gmt":"2010-11-21T19:50:54","slug":"upload-de-plusieurs-fichiers-avec-csharp","status":"publish","type":"post","link":"https:\/\/bratched.com\/fr\/2010\/11\/21\/upload-de-plusieurs-fichiers-avec-csharp\/","title":{"rendered":"Upload de plusieurs fichiers avec c#"},"content":{"rendered":"
Avez-vous d\u00e9j\u00e0 \u00e9t\u00e9 dans une situation o\u00f9 vous avez besoin pour t\u00e9l\u00e9charger plusieurs fichiers \u00e0 un h\u00f4te distant et passer des param\u00e8tres suppl\u00e9mentaires dans la requ\u00eate ? Malheureusement il n’y a rien dans la BCL qui nous permet d’atteindre cet objectif hors de la bo\u00eete.<\/div>\n

Nous avons la m\u00e9thode UploadFile<\/a> , mais il est limit\u00e9 \u00e0 un seul fichier et ne nous permet pas de passer des param\u00e8tres suppl\u00e9mentaires. Alors allons-y et \u00e9crire de telle m\u00e9thode. L’\u00e9l\u00e9ment important est que cette m\u00e9thode doit \u00eatre conforme RFC 1867<\/a> afin que le serveur web distant peut analyser correctement les informations.<\/p>\n

Tout d’abord, nous d\u00e9finissons un mod\u00e8le repr\u00e9sentant un seul fichier \u00e0 t\u00e9l\u00e9charger :<\/p>\n

\n
    public class UploadFile\n    {\n        public UploadFile()\n        {\n            ContentType = \"application\/octet-stream\";\n        }\n        public string Name { get; set; }\n        public string Filename { get; set; }\n        public string ContentType { get; set; }\n        public Stream Stream { get; set; }\n    }\n<\/pre>\n
<\/p>\n<\/div>\n
<\/p>\n
Et voici une impl\u00e9mentation de la m\u00e9thode sample UploadFiles :<\/p>\n
\n
    public byte[] UploadFiles(string address, IEnumerable<UploadFile> files, NameValueCollection values)\n    {\n        var request = WebRequest.Create(address);\n        request.Method = \"POST\";\n        var boundary = \"---------------------------\" + DateTime.Now.Ticks.ToString(\"x\", NumberFormatInfo.InvariantInfo);\n        request.ContentType = \"multipart\/form-data; boundary=\" + boundary;\n        boundary = \"--\" + boundary;\n\n        using (var requestStream = request.GetRequestStream())\n        {\n            \/\/ Write the values\n            foreach (string name in values.Keys)\n            {\n                var buffer = Encoding.ASCII.GetBytes(boundary + Environment.NewLine);\n                requestStream.Write(buffer, 0, buffer.Length);\n                buffer = Encoding.ASCII.GetBytes(string.Format(\"Content-Disposition: form-data; name=\"{0}\"{1}{1}\", name, Environment.NewLine));\n                requestStream.Write(buffer, 0, buffer.Length);\n                buffer = Encoding.UTF8.GetBytes(values[name] + Environment.NewLine);\n                requestStream.Write(buffer, 0, buffer.Length);\n            }\n\n            \/\/ Write the files\n            foreach (var file in files)\n            {\n                var buffer = Encoding.ASCII.GetBytes(boundary + Environment.NewLine);\n                requestStream.Write(buffer, 0, buffer.Length);\n                buffer = Encoding.UTF8.GetBytes(string.Format(\"Content-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"{2}\", file.Name, file.Filename, Environment.NewLine));\n                requestStream.Write(buffer, 0, buffer.Length);\n                buffer = Encoding.ASCII.GetBytes(string.Format(\"Content-Type: {0}{1}{1}\", file.ContentType, Environment.NewLine));\n                requestStream.Write(buffer, 0, buffer.Length);\n                file.Stream.CopyTo(requestStream);\n                buffer = Encoding.ASCII.GetBytes(Environment.NewLine);\n                requestStream.Write(buffer, 0, buffer.Length);\n            }\n\n            var boundaryBuffer = Encoding.ASCII.GetBytes(boundary + \"--\");\n            requestStream.Write(boundaryBuffer, 0, boundaryBuffer.Length);\n        }\n\n        using (var response = request.GetResponse())\n        using (var responseStream = response.GetResponseStream())\n        using (var stream = new MemoryStream())\n        {\n            responseStream.CopyTo(stream);\n            return stream.ToArray();\n        }\n    }\n<\/pre>\n
<\/p>\n<\/div>\n
Et voici un exemple d’utilisation :<\/p>\n
 <\/p>\n
\n
    using (var stream1 = File.Open(\"test.txt\", FileMode.Open))\n    using (var stream2 = File.Open(\"test.xml\", FileMode.Open))\n    using (var stream3 = File.Open(\"test.pdf\", FileMode.Open))\n    {\n        var files = new[] \n        {\n            new UploadFile\n            {\n                Name = \"file\",\n                Filename = \"test.txt\",\n                ContentType = \"text\/plain\",\n                Stream = stream1\n            },\n            new UploadFile\n            {\n                Name = \"file\",\n                Filename = \"test.xml\",\n                ContentType = \"text\/xml\",\n                Stream = stream2\n            },\n            new UploadFile\n            {\n                Name = \"file\",\n                Filename = \"test.pdf\",\n                ContentType = \"application\/pdf\",\n                Stream = stream3\n            }\n        };\n\n        var values = new NameValueCollection\n        {\n            { \"key1\", \"value1\" },\n            { \"key2\", \"value2\" },\n            { \"key3\", \"value3\" },\n        };\n        \n        byte[] result = UploadFiles(\"http:\/\/localhost:1234\/upload\", files, values);\n    }<\/pre>\n
<\/p>\n<\/div>\n
Dans cet exemple, nous sommes t\u00e9l\u00e9chargement 3 valeurs et 3 fichiers \u00e0 l’h\u00f4te distant.<\/p>\n
La prochaine fois, je vais montrer comment am\u00e9liorer ce code en ajoutant une version asynchrone \u00e0 l’aide de la biblioth\u00e8que TPL dans .NET 4.0.<\/p>\n","protected":false},"excerpt":{"rendered":"
Avez-vous d\u00e9j\u00e0 \u00e9t\u00e9 dans une situation o\u00f9 vous avez besoin pour t\u00e9l\u00e9charger plusieurs fichiers \u00e0 un h\u00f4te distant et passer des param\u00e8tres suppl\u00e9mentaires dans la requ\u00eate ? Malheureusement il n’y a rien dans la BCL qui nous permet d’atteindre cet objectif hors de la bo\u00eete. Nous avons la m\u00e9thode UploadFile , mais il est limit\u00e9 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[25],"tags":[26,38,27,28,5,39],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t