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阿里云各产品的开放API

亲，给你个C#的示例：

public static void PutObject(string key, string fileName)
        {
            try
            {
                string bucketName = BucketName;
                string fileToUpload = fileName;
                OssClient ossClient = new OssClient(new Uri("http://oss.aliyuncs.com/"), accessId, accessKey,);
                ObjectMetadata metadata = new ObjectMetadata();
                metadata.UserMetadata.Add("myfield1", "test1");

                FileStream fs = null;
                try
                {
                    fs = File.Open(fileToUpload, FileMode.Open);

                    PutObjectResult result = ossClient.PutObject(bucketName, key, fs, metadata);

                }
                catch (Exception ex)
                {
                    if (fs != null)
                    {
                        fs.Close();
                    }
                }
            }
            catch (Exception e) { throw e; }
        }