一个批量下载其它机子图片的c#类(downmoon)

using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.IO;
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namespace DownloadImagebyXMLListFor2008
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{
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public class HttpDownLoad
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{
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/**//// <summary>
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/// HttpWebRequest Property
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/// </summary>
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/// <param name="fileName"></param>
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/// <param name="url"></param>
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/// <param name="localPath"></param>
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/// <param name="timeout"></param>
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public static void DownloadOneFileByURL(string fileName, string url, string localPath, int timeout)
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{
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System.Net.HttpWebRequest request = null;
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System.Net.HttpWebResponse response = null;
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request = (System.Net.HttpWebRequest)System.Net.HttpWebRequest.Create(url + fileName);
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request.Timeout = timeout;//8000 Not work ?
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response = (System.Net.HttpWebResponse)request.GetResponse();
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Stream s = response.GetResponseStream();
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BinaryReader br = new BinaryReader(s);
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//int length2 = Int32.TryParse(response.ContentLength.ToString(), out 0);
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int length2 = Int32.Parse(response.ContentLength.ToString());
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byte[] byteArr = new byte[length2];
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s.Read(byteArr, 0, length2);
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if (File.Exists(localPath + fileName))

{ File.Delete(localPath + fileName); }
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if (Directory.Exists(localPath) == false)

{ Directory.CreateDirectory(localPath); }
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FileStream fs = File.Create(localPath + fileName);
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fs.Write(byteArr, 0, length2);
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fs.Close();
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br.Close();
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}
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/**//// <summary>
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///Web Client Method ,only For Small picture
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/// </summary>
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/// <param name="fileName"></param>
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/// <param name="url"></param>
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/// <param name="localPath"></param>
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public static void DownloadOneFileByURLWithWebClient(string fileName, string url, string localPath)
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{
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System.Net.WebClient wc = new System.Net.WebClient();
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if (File.Exists(localPath + fileName))

{ File.Delete(localPath + fileName); }
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if (Directory.Exists(localPath) == false)

{ Directory.CreateDirectory(localPath); }
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wc.DownloadFile(url + fileName, localPath + fileName);
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}
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}
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}
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需要注意点：
第一　DownloadOneFileByURL方法，有时会下载不了文件，如果文件大于40K就更明显，DownloadOneFileByURLWithWebClient则无此问题。
第二　调用时请用Thread,给出一个示例

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private void btnGet_Click(object sender, EventArgs e)
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{
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if (txtTempFile.Text.Trim().Length == 0)
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{
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ErrorStop("列表文件为空！"); return;
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}
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System.Threading.Thread thread = new System.Threading.Thread(new System.Threading.ThreadStart(DownloadAll));
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thread.Start();
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}
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private void DownloadAll()
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{
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List<string> ls = GetStringsByFile(txtTempFile.Text.Trim());
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if (null != ls)
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{
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foreach (string s in ls)
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{
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try
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{
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//HttpDownLoad.DownloadOneFileByURL(s, Globals.HttpPreUrl, Globals.LocalPrePath, 8000000);
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HttpDownLoad.DownloadOneFileByURLWithWebClient(s, Globals.HttpPreUrl, Globals.LocalPrePath);
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}
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catch

{ continue; }
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}
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}
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}