winform 导入Excel到数据库

 static ArrayList Sheets(string filepath)
        {
            ArrayList al = new ArrayList();
            string strconn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + filepath + ";Extended Properties=Excel 8.0;";
            OleDbConnection conn = new OleDbConnection(strconn);
            conn.Open();
            DataTable sheetnames = conn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, new object[] { null, null, null, "TABLE" });
            conn.Close();
            foreach (DataRow row in sheetnames.Rows) { al.Add(row["table_name"].ToString()); }
            return al;
        }

        static DataTable ExcelDataSource(string filepath, string sheetname)
        {
            string strconn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + filepath + ";Extended Properties='Excel 8.0;HDR=YES;IMEX=1'";
            OleDbConnection conn = new OleDbConnection(strconn);
            OleDbDataAdapter oada = new OleDbDataAdapter("select * from [" + sheetname + "]", strconn);//
            DataTable dt = new DataTable();
            oada.Fill(dt);
            return dt;
        }

        static void In(DataTable dt)
        {
            SqlConnection conn = new SqlConnection("server=.;database=ManageDatas;uid=sa;pwd=sa;");
            SqlCommand cmd = new SqlCommand();
            try
            {
                cmd.Connection = conn;
                cmd.CommandType = CommandType.Text;
                conn.Open();
                foreach (DataRow row in dt.Rows)
                {
                    cmd.CommandText = @"if (select count(chvBandName) from dbo.tblBand WHERE chvBandName=@name)=1 
                                        begin 
                                        update dbo.tblBand set chvBandName=@name WHERE chvBandName=@name 
                                        end 
                                        else 
                                        begin 
                                        insert into dbo.tblBand values(@name) 
                                        end ";
                    cmd.Parameters.Add("@name", SqlDbType.NVarChar, 50).Value = row[0].ToString();
                    int i = cmd.ExecuteNonQuery();
                    cmd.Parameters.Clear();
                }
            }
            catch (Exception ex) { }
            finally { conn.Close(); }
        }

        public static void ImportExcel()
        {
            //获取Excel文件的路径
            OpenFileDialog ofd1 = new OpenFileDialog();
            ofd1.ShowDialog();
            string FilePath = ofd1.FileName;

            if (!string.IsNullOrEmpty(FilePath))
            {
                In(ExcelDataSource(FilePath, Sheets(FilePath)[0].ToString()));
            }
        }

命名空间：

using System.Collections;
using System.Data.OleDb;

添加引用：Microsoft.Office.Interop.Excel.dll