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一：OLEDB方式操作Excel的个人理解
就是把要操作的Excel当作一个数据库，所有对Excel的操作，就变成了对“数据库”的操作。那么这时就需要有一个数据库的连接字符串。
代码如下：
connStr = "Provider=Microsoft.ACE.OLEDB.12.0;" + "Data Source=" + strFileName + ";" + ";Extended Properties=\"Excel 12.0;HDR=YES\"“;
其中的strFileName是指的Excel文件名称。
二：读取Excel文件，并将内容读到DataTable中。
代码如下：
/// <summary> /// 读取Excel /// </summary> /// <param name="strFileName">Excel文件名</param> /// <param name="fileType"></param> /// <param name="sheetName">Excel中的sheet的名字</param> public static DataTable ExcelReader(string strFileName, string fileType, string sheetName) { string connStr = ""; DataTable _table; connStr = "Provider=Microsoft.ACE.OLEDB.12.0;" + "Data Source=" + strFileName + ";" + ";Extended Properties=\"Excel 12.0;HDR=YES\""; try { using (OleDbConnection conn = new OleDbConnection(connStr)) { conn.Open(); OleDbDataAdapter myCommand = new OleDbDataAdapter(string.Format("SELECT * FROM [{0}$]", sheetName), conn); DataSet myDataSet = new DataSet(); int i = myCommand.Fill(myDataSet); _table = myDataSet == null ? null : myDataSet.Tables.Count == 0 ? null : myDataSet.Tables[0]; } return _table; } catch (Exception ex) { return null; } }
返回的结果就是一个DataTable.
三：将DataTable保存为Excel文件
代码如下：
/// <summary>
/// 从DataTable中读取数据到excel中
/// </summary>
/// <param name="dt">传入的DataTable</param>
public static void DTToExcel(DataTable dt)
{
string fileName = ((string.IsNullOrEmpty(dt.TableName)) ? "Excel" : dt.TableName) + ".xls";
HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment;filename=" + fileName);
HttpContext.Current.Response.Charset = "UTF-8";
HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.Default;
HttpContext.Current.Response.ContentType = "application/vnd.ms-excel";
GridView GridView1 = new GridView();
GridView1.DataSource = dt;
GridView1.DataBind();
StringWriter tw = new StringWriter();
HtmlTextWriter hw = new HtmlTextWriter(tw);
GridView1.RenderControl(hw);
HttpContext.Current.Response.Write(tw.ToString());
HttpContext.Current.Response.End();
}
在使用DataTable导出Excel文件时，需要先创建DataTable，下面是DataTable的创建小实例：
DataTable dt = new DataTable(); string[] strArr = new string[] { "1", "2222", "333333333", "444" }; for (int i = 0; i < strArr.Count(); i++) { dt.Columns.Add(strArr[i]); } for (int i = 0; i < strArr.Count(); i++) { DataRow dr2 = dt.NewRow(); dr2[0] = "总记"; dr2[1] = "11"; dr2[2] = "22"; dr2[3] = "33"; dt.Rows.Add(dr2); }
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原文地址：http://www.cnblogs.com/bsyblog/p/4242385.html
