C#操作Excel数据增删改查(转)

C#操作Excel数据增删改查。

首先创建ExcelDB.xlsx文件，并添加两张工作表。

工作表1：

UserInfo表，字段：UserId、UserName、Age、Address、CreateTime。

工作表2：

Order表，字段：OrderNo、ProductName、Quantity、Money、SaleDate。

1、创建ExcelHelper.cs类，Excel文件处理类

using System;  
using System.Collections.Generic;  
using System.Linq;  
using System.Text;  
using System.Data.OleDb;  
using System.Data;  
  
namespace MyStudy.DAL  
{  
    /// <summary>  
    /// Excel文件处理类  
    /// </summary>  
    public class ExcelHelper  
    {  
        private static string fileName = AppDomain.CurrentDomain.SetupInformation.ApplicationBase + @"/ExcelFile/ExcelDB.xlsx";  
  
        private static OleDbConnection connection;  
        public static OleDbConnection Connection  
        {  
            get  
            {  
                string connectionString = "";  
                string fileType = System.IO.Path.GetExtension(fileName);  
                if (string.IsNullOrEmpty(fileType)) return null;  
                if (fileType == ".xls")  
                {  
                    connectionString = "Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" + fileName + ";" + ";Extended Properties=\"Excel 8.0;HDR=YES;IMEX=2\"";  
                }  
                else  
                {  
                    connectionString = "Provider=Microsoft.ACE.OLEDB.12.0;" + "Data Source=" + fileName + ";" + ";Extended Properties=\"Excel 12.0;HDR=YES;IMEX=2\"";  
                }  
                if (connection == null)  
                {  
                    connection = new OleDbConnection(connectionString);  
                    connection.Open();  
                }  
                else if (connection.State == System.Data.ConnectionState.Closed)  
                {  
                    connection.Open();  
                }  
                else if (connection.State == System.Data.ConnectionState.Broken)  
                {  
                    connection.Close();  
                    connection.Open();  
                }  
                return connection;  
            }  
        }  
  
        /// <summary>  
        /// 执行无参数的SQL语句  
        /// </summary>  
        /// <param name="sql">SQL语句</param>  
        /// <returns>返回受SQL语句影响的行数</returns>  
        public static int ExecuteCommand(string sql)  
        {  
            OleDbCommand cmd = new OleDbCommand(sql, Connection);  
            int result = cmd.ExecuteNonQuery();  
            connection.Close();  
            return result;  
        }  
  
        /// <summary>  
        /// 执行有参数的SQL语句  
        /// </summary>  
        /// <param name="sql">SQL语句</param>  
        /// <param name="values">参数集合</param>  
        /// <returns>返回受SQL语句影响的行数</returns>  
        public static int ExecuteCommand(string sql, params OleDbParameter[] values)  
        {  
            OleDbCommand cmd = new OleDbCommand(sql, Connection);  
            cmd.Parameters.AddRange(values);  
            int result = cmd.ExecuteNonQuery();  
            connection.Close();  
            return result;  
        }  
  
        /// <summary>  
        /// 返回单个值无参数的SQL语句  
        /// </summary>  
        /// <param name="sql">SQL语句</param>  
        /// <returns>返回受SQL语句查询的行数</returns>  
        public static int GetScalar(string sql)  
        {  
            OleDbCommand cmd = new OleDbCommand(sql, Connection);  
            int result = Convert.ToInt32(cmd.ExecuteScalar());  
            connection.Close();  
            return result;  
        }  
  
        /// <summary>  
        /// 返回单个值有参数的SQL语句  
        /// </summary>  
        /// <param name="sql">SQL语句</param>  
        /// <param name="parameters">参数集合</param>  
        /// <returns>返回受SQL语句查询的行数</returns>  
        public static int GetScalar(string sql, params OleDbParameter[] parameters)  
        {  
            OleDbCommand cmd = new OleDbCommand(sql, Connection);  
            cmd.Parameters.AddRange(parameters);  
            int result = Convert.ToInt32(cmd.ExecuteScalar());  
            connection.Close();  
            return result;  
        }  
  
        /// <summary>  
        /// 执行查询无参数SQL语句  
        /// </summary>  
        /// <param name="sql">SQL语句</param>  
        /// <returns>返回数据集</returns>  
        public static DataSet GetReader(string sql)  
        {  
            OleDbDataAdapter da = new OleDbDataAdapter(sql, Connection);  
            DataSet ds = new DataSet();  
            da.Fill(ds, "UserInfo");  
            connection.Close();  
            return ds;  
        }  
  
        /// <summary>  
        /// 执行查询有参数SQL语句  
        /// </summary>  
        /// <param name="sql">SQL语句</param>  
        /// <param name="parameters">参数集合</param>  
        /// <returns>返回数据集</returns>  
        public static DataSet GetReader(string sql, params OleDbParameter[] parameters)  
        {  
            OleDbDataAdapter da = new OleDbDataAdapter(sql, Connection);  
            da.SelectCommand.Parameters.AddRange(parameters);  
            DataSet ds = new DataSet();  
            da.Fill(ds);  
            connection.Close();  
            return ds;  
        }  
    }  
}  

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