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;
}
}