C#WebService下载文件

WebService项目中的Web.config配置代码

<appSettings>

<add key="UploadFileFolder" value="/Uploads/TestUpload/" />

</appSettings>

WebService项目中的ImageService.asmx代码

/// <summary>

/// Webservice中的下载文件处理函数

/// </summary>

/// <param name="filePath">文件路径</param>

/// <returns>返回文件流</returns>

[WebMethod(Description = "下载服务器站点文件，传递文件相对路径")]

public byte[] DownloadFile(string strFilePath)

{

FileStream fs = null;

string CurrentUploadFolderPath = Server.MapPath(ConfigurationManager.AppSettings["UploadFileFolder"]);

string CurrentUploadFilePath = CurrentUploadFolderPath + strFilePath;

if (File.Exists(CurrentUploadFilePath))

{

try

{

///打开现有文件以进行读取。

fs = File.OpenRead(CurrentUploadFilePath);

int b1;

System.IO.MemoryStream tempStream = new System.IO.MemoryStream();

while ((b1 = fs.ReadByte()) != -1)

{

tempStream.WriteByte(((byte)b1));

}

return tempStream.ToArray();

}

catch (Exception ex)

{

return new byte[0];

}

finally

{

fs.Close();

}

}

else

{

return new byte[0];

}

}

Winform项目中的窗体下载按钮代码

private void btnDownload_Click(object sender, EventArgs e)

{

string CurrentServiceFilePath = this.txtServiceFile.Text.Trim();

string CurrentDownloadFolderPath = this.txtDownloadFolder.Text.Trim();

if (CurrentServiceFilePath == "" || CurrentDownloadFolderPath == "")

{

MessageBox.Show(DownloadImage(CurrentServiceFilePath, CurrentDownloadFolderPath));

}

else if (CurrentServiceFilePath == "")

{

MessageBox.Show("请填写要下载的服务器文件路径和选择本地保存目录");

}

else if (CurrentDownloadFolderPath == "")

{

MessageBox.Show("请填写要下载的服务器文件路径和选择本地保存目录");

}

}

Winform项目中的窗体下载按钮调用函数

/// <summary>

/// 通过WebService下载文件

/// </summary>

/// <param name="ServiceFilePath">服务器图片路径</param>

/// <param name="DownloadFolderPath">本地图片路径</param>

private string DownloadImage(string ServiceFilePath, string DownloadFolderPath)

{

try

{

string DownloadFileName="";

if (ServiceFilePath.Contains("/"))

{

DownloadFileName=ServiceFilePath.Substring(ServiceFilePath.LastIndexOf("/"));

}

else

{

DownloadFileName = ServiceFilePath;

}

string DownloadFilePath = DownloadFolderPath +"\\"+ DownloadFileName;

localhost.ImageService myImageService=new localhost.ImageService();

byte[] bytes = myImageService.DownloadFile(ServiceFilePath);

if (bytes != null)

{

if (!Directory.Exists(DownloadFolderPath)) {

Directory.CreateDirectory(DownloadFolderPath);

}

if (!File.Exists(DownloadFilePath))

{

File.Create(DownloadFilePath).Dispose();

}

//如果不存在完整的上传路径就创建

FileInfo downloadInfo = new FileInfo(DownloadFilePath);

if (downloadInfo.IsReadOnly) { downloadInfo.IsReadOnly = false; }

//定义并实例化一个内存流，以存放提交上来的字节数组。

MemoryStream ms = new MemoryStream(bytes);

//定义实际文件对象，保存上载的文件。

FileStream fs = new FileStream(DownloadFilePath, FileMode.Create);

///把内内存里的数据写入物理文件

ms.WriteTo(fs);

fs.Flush();

ms.Flush();

ms.Close();

fs.Close();

fs = null;

ms = null;

}

return "下载成功";

}

catch(Exception ex)

{

return "下载失败"+ex.Message;

}

}

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