C# 通过 oledb 操作Excel实例代码

整理文档，搜刮出一个C# 通过 oledb 操作Excel实例代码，稍微整理精简一下做下分享。

public string GetConnectionString()
    {
      Dictionary<string, string> props = new Dictionary<string, string>();

      // XLSX - Excel 2007, 2010, 2012, 2013
      props["Provider"] = "Microsoft.ACE.OLEDB.12.0;";
      props["Extended Properties"] = "Excel 12.0 XML";
      props["Data Source"] = @"C:\tools\MyExcel.xlsx";

      // XLS - Excel 2003 and Older
      //props["Provider"] = "Microsoft.Jet.OLEDB.4.0";
      //props["Extended Properties"] = "Excel 8.0";
      //props["Data Source"] = "C:\\MyExcel.xls";

      var sb = new StringBuilder();

      foreach (KeyValuePair<string, string> prop in props)
      {
        sb.Append(prop.Key);
        sb.Append('=');
        sb.Append(prop.Value);
        sb.Append(';');
      }

      return sb.ToString();
    }

    public void WriteExcelFile()
    {
      string connectionString = GetConnectionString();

      using (OleDbConnection conn = new OleDbConnection(connectionString))
      {
        conn.Open();
        OleDbCommand cmd = new OleDbCommand();
        cmd.Connection = conn;

        cmd.CommandText = "CREATE TABLE [table1] (id INT, name VARCHAR, datecol DATE );";
        cmd.ExecuteNonQuery();

        cmd.CommandText = "INSERT INTO [table1](id,name,datecol) VALUES(1,'AAAA','2014-01-01');";
        cmd.ExecuteNonQuery();

        cmd.CommandText = "INSERT INTO [table1](id,name,datecol) VALUES(2, 'BBBB','2014-01-03');";
        cmd.ExecuteNonQuery();

        cmd.CommandText = "INSERT INTO [table1](id,name,datecol) VALUES(3, 'CCCC','2014-01-03');";
        cmd.ExecuteNonQuery();

        cmd.CommandText = "UPDATE [table1] SET name = 'DDDD' WHERE id = 3;";
        cmd.ExecuteNonQuery();

        conn.Close();
      }
    }

    public DataSet ReadExcelFile()
    {
      DataSet ds = new DataSet();

      string connectionString = GetConnectionString();

      using (OleDbConnection conn = new OleDbConnection(connectionString))
      {
        conn.Open();
        OleDbCommand cmd = new OleDbCommand();
        cmd.Connection = conn;

        // Get all Sheets in Excel File
        DataTable dtSheet = conn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null);

        // Loop through all Sheets to get data
        foreach (DataRow dr in dtSheet.Rows)
        {
          string sheetName = dr["TABLE_NAME"].ToString();

          if (!sheetName.EndsWith("$"))
            continue;

          // Get all rows from the Sheet
          cmd.CommandText = "SELECT * FROM [" + sheetName + "]";

          DataTable dt = new DataTable();
          dt.TableName = sheetName;

          OleDbDataAdapter da = new OleDbDataAdapter(cmd);
          da.Fill(dt);

          ds.Tables.Add(dt);
        }

        cmd = null;
        conn.Close();
      }

      return ds;
    }

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原文链接：http://www.cnblogs.com/lizikang2013/p/6930833.html?utm_source=tuicool&utm_medium=referral