上接稳扎稳打Silverlight(20) - 2.0通信之WebClient, 以字符串的形式上传/下载数据

using System; 
using System.Linq; 
using System.Runtime.Serialization; 
using System.ServiceModel; 
using System.ServiceModel.Activation; 
 
using System.ServiceModel.Web; 
using System.Collections.Generic; 
using System.Text; 
using System.IO; 
 
/// <summary> 
/// 提供 REST 服务的类 
/// 注：Silverlight只支持 GET 和 POST 
/// </summary> 
[ServiceContract] 
[AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)] 
public  class REST 
{ 
         /// <summary> 
         /// 用于演示返回 JSON（对象） 的 REST 服务 
         /// </summary> 
         /// <param name="name"></param> 
         /// <returns></returns> 
        [OperationContract] 
        [WebGet(UriTemplate =  "User/{name}/json", ResponseFormat = WebMessageFormat.Json)] 
         public User HelloJson( string name) 
        { 
                 return  new User { Name = name, DayOfBirth =  new DateTime(1980, 2, 14) }; 
        } 
 
         /// <summary> 
         /// 用于演示返回 JSON（集合） 的 REST 服务 
         /// </summary> 
         /// <returns></returns> 
        [OperationContract] 
        [WebGet(UriTemplate =  "Users/json", ResponseFormat = WebMessageFormat.Json)] 
         public List<User> HelloJson2() 
        { 
                 return  new List<User>    
                {    
                         new User(){ Name =  "webabcd01", DayOfBirth =  new DateTime(1980, 1, 1) }, 
                         new User(){ Name =  "webabcd02", DayOfBirth =  new DateTime(1980, 2, 2) }, 
                         new User(){ Name =  "webabcd03", DayOfBirth =  new DateTime(1980, 3, 3) }, 
                }; 
        } 
 
         /// <summary> 
         /// 用于演示返回 XML（对象） 的 REST 服务 
         /// </summary> 
         /// <param name="name"></param> 
         /// <returns></returns> 
        [OperationContract] 
        [WebGet(UriTemplate =  "User/{name}/xml", ResponseFormat = WebMessageFormat.Xml)] 
         public User HelloXml( string name) 
        { 
                 return  new User { Name = name, DayOfBirth =  new DateTime(1980, 2, 14) }; 
        } 
 
         /// <summary> 
         /// 用于演示返回 XML（集合） 的 REST 服务 
         /// </summary> 
         /// <returns></returns> 
        [OperationContract] 
        [WebGet(UriTemplate =  "Users/xml", ResponseFormat = WebMessageFormat.Xml)] 
         public List<User> HelloXml2() 
        { 
                 return  new List<User>    
                {    
                         new User(){ Name =  "webabcd01", DayOfBirth =  new DateTime(1980, 1, 1) }, 
                         new User(){ Name =  "webabcd02", DayOfBirth =  new DateTime(1980, 2, 2) }, 
                         new User(){ Name =  "webabcd03", DayOfBirth =  new DateTime(1980, 3, 3) }, 
                }; 
        } 
 
         /// <summary> 
         /// 用于演示以字符串的形式上传数据的 REST 服务 
         /// </summary> 
         /// <param name="fileName">上传的文件名</param> 
         /// <param name="stream">POST 过来的数据</param> 
         /// <returns></returns> 
        [OperationContract] 
        [WebInvoke(UriTemplate =  "UploadString/?fileName={fileName}", Method =  "POST", ResponseFormat = WebMessageFormat.Json)] 
         public  bool UploadString( string fileName, Stream stream) 
        { 
                 // 文件的服务端保存路径 
                 string path = Path.Combine("C:\\", fileName); 
 
                 try 
                { 
                         using (StreamReader sr =  new StreamReader(stream)) 
                        { 
                                 // 将 POST 过来的被 Base64 编码过字符串传换成 byte[] 
                                 byte[] buffer = Convert.FromBase64String(sr.ReadToEnd()); 
 
                                 using (FileStream fs =  new FileStream(path, FileMode.Create, FileAccess.Write, FileShare.None)) 
                                { 
                                         // 将文件写入到服务端 
                                        fs.Write(buffer, 0, buffer.Length); 
                                } 
                        } 
 
                         return  true; 
                } 
                 catch 
                { 
                         return  false; 
                } 
        } 
 
         /// <summary> 
         /// 用于演示以流的形式上传数据的 REST 服务 
         /// </summary> 
         /// <param name="fileName">上传的文件名</param> 
         /// <param name="stream">POST 过来的数据（流的方式）</param> 
         /// <returns></returns> 
        [OperationContract] 
        [WebInvoke(UriTemplate =  "UploadStream/?fileName={fileName}", Method =  "POST", ResponseFormat = WebMessageFormat.Json)] 
         public  bool UploadStream( string fileName, Stream stream) 
        { 
                 // 文件的服务端保存路径 
                 string path = Path.Combine("C:\\", fileName); 
 
                 try 
                { 
                         using (FileStream fs =  new FileStream(path, FileMode.Create, FileAccess.Write, FileShare.None)) 
                        { 
                                 byte[] buffer =  new  byte[4096]; 
                                 int count = 0; 
 
                                 // 每 POST 过来 4096 字节的数据，往服务端写一次 
                                 while ((count = stream.Read(buffer, 0, buffer.Length)) > 0) 
                                { 
                                        fs.Write(buffer, 0, count); 
                                } 
                        } 
 
                         return  true; 
                } 
                 catch 
                { 
                         return  false; 
                } 
        } 
}