首先：
引用 ICSharpCode.SharpZipLib.dll，百度下载
然后引用命名空间：
using ICSharpCode.SharpZipLib.Zip;
using ICSharpCode.SharpZipLib.Checksums;
我自己的代码：
//取数据dt
string path = Server.MapPath("~\\tempzt\\");if (dt.Rows.Count > 0)
{
System.Text.StringBuilder sb = new System.Text.StringBuilder();
string wjmc = "xxxxxxxxxxxx".txt"; for (int n = 0; n < dt.Rows.Count; n++)
{
for (int m = 0; m < dt.Columns.Count; m++)
{
sb.Append(dt.Rows[n][m].ToString()); sb.Append("\t");
}
sb.Append("\r\n");
}
txt_export(sb, wjmc, path);
}
}
}
//zip下载
string[] files = Directory.GetFiles(path);
if (files.Length > 0)
{
string name = "xxxxxxxxxxxx.zip";
ZipFileMain(files, path + name, 9);
DownLoadZip(path + name, name);
}
else
{
Response.Write("<script>alert('没有目标文件！请先写入')</script>");
}public void txt_export(StringBuilder sb, string wjmc, string path)
{
//zip下载
string txtPath = path + wjmc;
if (!Directory.Exists(path))
{
Directory.CreateDirectory(path);
} if (File.Exists(txtPath))
{
File.Delete(txtPath);
} StreamWriter sw = new StreamWriter(txtPath, false, System.Text.Encoding.Default);
sw.Write(sb.ToString());
sw.Close();
//zip下载
} //zip下载
/// <summary>
/// 压缩文件
/// </summary>
/// <param name="fileName">要压缩的所有文件（完全路径)</param>
/// <param name="name">压缩后文件路径</param>
/// <param name="Level">压缩级别</param>
public void ZipFileMain(string[] filenames, string name, int Level)
{
if (File.Exists(name))
{
File.Delete(name);
}
ZipOutputStream s = new ZipOutputStream(File.Create(name));
Crc32 crc = new Crc32();
//压缩级别
s.SetLevel(Level); // 0 - store only to 9 - means best compression
try
{
foreach (string file in filenames)
{
if (!Path.GetExtension(file).Equals(".txt"))
{
continue;
}
//打开压缩文件
FileStream fs = File.OpenRead(file);//文件地址
byte[] buffer = new byte[fs.Length];
fs.Read(buffer, 0, buffer.Length);
//建立压缩实体
ZipEntry entry = new ZipEntry(Path.GetFileName(file));//原文件名
//时间
entry.DateTime = DateTime.Now;
//空间大小
entry.Size = fs.Length;
fs.Close();
crc.Reset();
crc.Update(buffer);
entry.Crc = crc.Value;
s.PutNextEntry(entry);
s.Write(buffer, 0, buffer.Length);
File.Delete(file);
}
}
catch
{
throw;
}
finally
{
s.Finish();
s.Close();
}
} public void DownLoadZip(string fileName,string name)
{
Response.ContentType = "application/x-zip-compressed";
Response.AddHeader("Content-Disposition", "attachment;filename=" + name + "");
Response.TransmitFile(fileName);
}