笔记整理 使用OleDb，将Excel导入DataSet

public class ExcelUtil
{
/// <summary>
/// 从Excel文件导入DataSet
/// Excel的连接字符串说明(详细参看 http://www.connectionstrings.com/excel )：
/// HDR=Yes 表示第一行是表头，没有数据，读取时忽略第一行。设置为 No 时则从第一行读取。
/// IMEX=1  表示告诉OleDb驱动，所有数据将作为字符串读取(numbers,dates等)
/// 注意：有时候因为ISAM驱动没有安装，设置HDR和IMEX会出异常。去掉即可。
/// </summary>
/// <param name="fileName">Excel文件路径</param>
/// <param name="firstRowIsHeader">第一行是否是表头</param>
/// <returns>Excel数据，一个Sheet对应一个DataTable</returns>
public static DataSet GetDataSetFromExcel(string fileName, string sheetName = "", bool firstRowIsHeader = true)
{
if (!System.IO.File.Exists(fileName))
throw new ArgumentException("file is not exist!");

var ds = new DataSet();
var strConn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source='{0}';Extended Properties=Excel 8.0;";
//if (firstRowIsHeader)
//    strConn += "HDR=Yes;";
strConn = string.Format(strConn, fileName);
using (var conn = new OleDbConnection(strConn))
{
conn.Open();
DataTable excelSchema = null;
string sql = "select * from [{0}]";
var adapter = new OleDbDataAdapter();
adapter.SelectCommand = conn.CreateCommand();

if (string.IsNullOrEmpty(sheetName))
{
excelSchema = conn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables,
new object[] { null, null, null, "TABLE" });

foreach (DataRow row in excelSchema.Rows)
{

var sheet = row["TABLE_NAME"].ToString();
sql = string.Format(sql, sheet);
adapter.SelectCommand.CommandText = sql;
adapter.Fill(ds, sheet);
}
}
else
{
sql = string.Format(sql, sheetName + "{1}quot;);
adapter.SelectCommand.CommandText = sql;
adapter.Fill(ds, sheetName);
}
conn.Close();
}
return ds;
}

}

上面代码中46行的 "quot;" 应为 "$"

Excel查询的时候，加上范围也可以。这样就能指定范围获得数据。比如： (1) string sql = "select * from [{0}A:C]"; (2) string sql = "select * from [{0}A1:C100]";

使用：

private void btnExcel2Data_Click(object sender, EventArgs e)
{
openFileDialog1.Filter = "Excel Files | *.xls";
var ret = openFileDialog1.ShowDialog();
if (ret == System.Windows.Forms.DialogResult.OK)
{
DataSet ds = GetDataSetFromExcel(openFileDialog1.FileName, false);
this.dataGridView1.DataSource = ds.Tables[0];
}
}