DataTable中的数据导出Excel文件
///
/// 将DataTable中的数据导出到指定的Excel文件中
///
///
Web页面对象
///
包含被导出数据的DataTable对象
///
Excel文件的名称
public static void Export(System.Web.UI.Page page,System.Data.DataTable tab,string FileName)
{
System.Web.HttpResponse httpResponse = page.Response;
System.Web.UI.WebControls.DataGrid dataGrid=new System.Web.UI.WebControls.DataGrid();
dataGrid.DataSource=tab.DefaultView;
dataGrid.AllowPaging = false;
dataGrid.HeaderStyle.BackColor = System.Drawing.Color.Green;
dataGrid.HeaderStyle.HorizontalAlign = HorizontalAlign.Center;
dataGrid.HeaderStyle.Font.Bold = true;
dataGrid.DataBind();
httpResponse.AppendHeader("Content-Disposition","attachment;filename="+HttpUtility.UrlEncode(FileName,System.Text.Encoding.UTF8)); //filename="*.xls";
httpResponse.ContentEncoding=System.Text.Encoding.GetEncoding("GB2312");
httpResponse.ContentType ="application/ms-Excel";
System.IO.StringWriter tw = new System.IO.StringWriter() ;
System.Web.UI.HTMLTextWriter hw = new System.Web.UI.HTMLTextWriter (tw);
dataGrid.RenderControl(hw);
string filePath = page.Server.MapPath("..")+"\\Files\\" +FileName;
System.IO.StreamWriter sw = System.IO.File.CreateText(filePath);
sw.Write(tw.ToString());
sw.Close();
DownFile(httpResponse,FileName,filePath);
httpResponse.End();
}
private static bool DownFile(System.Web.HttpResponse Response,string fileName,string fullPath)
{
try
{
Response.ContentType = "application/octet-stream";
Response.AppendHeader("Content-Disposition","attachment;filename=" +
HttpUtility.UrlEncode(fileName,System.Text.Encoding.UTF8) + ";charset=GB2312");
System.IO.FileStream fs= System.IO.File.OpenRead(fullPath);
long fLen=fs.Length;
int size=102400;//每100K同时下载数据
byte[] readData = new byte[size];//指定缓冲区的大小
if(size>fLen)size=Convert.ToInt32(fLen);
long fPos=0;
bool isEnd=false;
while (!isEnd)
{
if((fPos+size)>fLen)
{
size=Convert.ToInt32(fLen-fPos);
readData = new byte[size];
isEnd=true;
}
fs.Read(readData, 0, size);//读入一个压缩块
Response.BinaryWrite(readData);
fPos+=size;
}
fs.Close();
System.IO.File.Delete(fullPath);
return true;
}
catch
{
return false;
}
}
将指定Excel文件中的数据转换成DataTable
///
/// 将指定Excel文件中的数据转换成DataTable对象，供应用程序进一步处理
///
///
///
public static System.Data.DataTable Import(string filePath)
{
System.Data.DataTable rs = new System.Data.DataTable();
bool canOpen=false;
OleDbConnection conn = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;"+
"Data Source=" + filePath + ";" +
"Extended Properties=\"Excel 8.0;\"");
try//尝试数据连接是否可用
{
conn.Open();
conn.Close();
canOpen=true;
}
catch{}
if(canOpen)
{
try//如果数据连接可以打开则尝试读入数据
{
OleDbCommand myOleDbCommand = new OleDbCommand("SELECT * FROM [Sheet1$]",conn);
OleDbDataAdapter myData = new OleDbDataAdapter(myOleDbCommand);
myData.Fill(rs);
conn.Close();
}
catch//如果数据连接可以打开但是读入数据失败，则从文件中提取出工作表的名称，再读入数据
{
string sheetName=GetSheetName(filePath);
if(sheetName.Length>0)
{
OleDbCommand myOleDbCommand = new OleDbCommand("SELECT * FROM ["+sheetName+"$]",conn);
OleDbDataAdapter myData = new OleDbDataAdapter(myOleDbCommand);
myData.Fill(rs);
conn.Close();
}
}
}
else
{
System.IO.StreamReader tmpStream=File.OpenText(filePath);
string tmpStr=tmpStream.ReadToEnd();
tmpStream.Close();
rs=GetDataTableFromString(tmpStr);
tmpStr="";
}
return rs;
}
///
/// 将指定HTML字符串的数据转换成DataTable对象 --根据“”等特殊字符进行处理
///
///
HTML字符串
///
private static DataTable GetDataTableFromString(string tmpHTML)
{
string tmpStr=tmpHTML;
DataTable TB=new DataTable();
//先处理一下这个字符串，删除第一个之前合最后一个之后的部分
int index=tmpStr.IndexOf("-1)
tmpStr=tmpStr.Substring(index);
else
return TB;
index=tmpStr.LastIndexOf("");
if(index>-1)
tmpStr=tmpStr.Substring(0,index+5);
else
return TB;
bool existsSparator=false;
char Separator=Convert.ToChar("^");
//如果原字符串中包含分隔符“^”则先把它替换掉
if(tmpStr.IndexOf(Separator.ToString())>-1)
{
existsSparator=true;
tmpStr=tmpStr.Replace("^","^$&^");
}
//先根据“”分拆
string[] tmpRow=tmpStr.Replace("","^").Split(Separator);
for(int i=0;i { DataRow newRow=TB.NewRow(); string tmpStrI=tmpRow[i]; if(tmpStrI.IndexOf("-1) { tmpStrI=tmpStrI.Substring(tmpStrI.IndexOf(" if(tmpStrI.IndexOf("display:none")tmpStrI.IndexOf(">")) { tmpStrI=tmpStrI.Replace("","^"); string[] tmpField=tmpStrI.Split(Separator); for(int j=0;j")+1; if(index>0) { string field=tmpField[j].Substring(index,tmpField[j].Length-index); if(existsSparator) field=field.Replace("^$&^","^"); if(i==0) { string tmpFieldName=field; int sn=1; while(TB.Columns.Contains(tmpFieldName)) { tmpFieldName=field+sn.ToString(); sn+=1; } TB.Columns.Add(tmpFieldName); } else { newRow[j]=field; } }//end of if(index>0) } if(i>0) TB.Rows.Add(newRow); } } } TB.AcceptChanges(); return TB; } /// /// 从指定HTML字符串中剔除指定的对象 /// /// HTML字符串 /// 需要剔除的对象--例如输入""则剔除""和">" /// public static string RemoveString(string tmpHTML,string remove) { tmpHTML=tmpHTML.Replace(remove.Replace("<","
tmpHTML=RemoveStringHead(tmpHTML,remove); return tmpHTML; } /// /// 只供方法RemoveString()使用 /// /// private static string RemoveStringHead(string tmpHTML,string remove) { //为了方便注释，假设输入参数remove="" if(remove.Length<1) return tmpHTML;//参数remove为空：不处理返回 if((remove.Substring(0,1)!="")) return tmpHTML;//参数remove不是：不处理返回 int IndexS=tmpHtml.IndexOf(remove.Replace(">",""));//查找“ int IndexE=-1; if(IndexS>-1) { string tmpRight=tmpHTML.Substring(IndexS,tmpHTML.Length-IndexS); IndexE=tmpRight.IndexOf(">"); if(IndexE>-1) tmpHTML=tmpHTML.Substring(0,IndexS)+tmpHTML.Substring(IndexS+IndexE+1); if(tmpHtml.IndexOf(remove.Replace(">",""))>-1) tmpHTML=RemoveStringHead(tmpHTML,remove); } return tmpHTML; } /// /// 将指定Excel文件中读取第一张工作表的名称 /// /// /// private static string GetSheetName(string filePath) { string sheetName=""; System.IO.FileStream tmpStream=File.OpenRead(filePath); byte[] fileByte=new byte[tmpStream.Length]; tmpStream.Read(fileByte,0,fileByte.Length); tmpStream.Close(); byte[] tmpByte=new byte[]{Convert.ToByte(11),Convert.ToByte(0),Convert.ToByte(0),Convert.ToByte(0),Convert.ToByte(0),Convert.ToByte(0),Convert.ToByte(0),Convert.ToByte(0), Convert.ToByte(11),Convert.ToByte(0),Convert.ToByte(0),Convert.ToByte(0),Convert.ToByte(0),Convert.ToByte(0),Convert.ToByte(0),Convert.ToByte(0), Convert.ToByte(30),Convert.ToByte(16),Convert.ToByte(0),Convert.ToByte(0)}; int index=GetSheetIndex(fileByte,tmpByte); if(index>-1) { index+=16+12; System.Collections.ArrayList sheetNameList=new System.Collections.ArrayList(); for(int i=index;i { byte temp=fileByte[i]; if(temp!=Convert.ToByte(0)) sheetNameList.Add(temp); else break; } byte[] sheetNameByte=new byte[sheetNameList.Count]; for(int i=0;i sheetNameByte[i]=Convert.ToByte(sheetNameList[i]); sheetName=System.Text.Encoding.Default.GetString(sheetNameByte); } return sheetName; } /// /// 只供方法GetSheetName()使用 /// /// private static int GetSheetIndex(byte[] FindTarget,byte[] FindItem) { int index=-1; int FindItemLength=FindItem.Length; if(FindItemLength<1) return -1; int FindTargetLength=FindTarget.Length; if((FindTargetLength-1)-1;i--) { System.Collections.ArrayList tmpList=new System.Collections.ArrayList(); int find=0; for(int j=0;j { if(FindTarget[i+j]==FindItem[j]) find+=1; } if(find==FindItemLength) { index=i; break; } } return index; }