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 { /// /// Excel文件处理类 /// 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; } } /// /// 执行无参数的SQL语句 /// /// SQL语句 /// 返回受SQL语句影响的行数 public static int ExecuteCommand(string sql) { OleDbCommand cmd = new OleDbCommand(sql, Connection); int result = cmd.ExecuteNonQuery(); connection.Close(); return result; } /// /// 执行有参数的SQL语句 /// /// SQL语句 /// 参数集合 /// 返回受SQL语句影响的行数 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; } /// /// 返回单个值无参数的SQL语句 /// /// SQL语句 /// 返回受SQL语句查询的行数 public static int GetScalar(string sql) { OleDbCommand cmd = new OleDbCommand(sql, Connection); int result = Convert.ToInt32(cmd.ExecuteScalar()); connection.Close(); return result; } /// /// 返回单个值有参数的SQL语句 /// /// SQL语句 /// 参数集合 /// 返回受SQL语句查询的行数 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; } /// /// 执行查询无参数SQL语句 /// /// SQL语句 /// 返回数据集 public static DataSet GetReader(string sql) { OleDbDataAdapter da = new OleDbDataAdapter(sql, Connection); DataSet ds = new DataSet(); da.Fill(ds, "UserInfo"); connection.Close(); return ds; } /// /// 执行查询有参数SQL语句 /// /// SQL语句 /// 参数集合 /// 返回数据集 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; } } } 2、 创建实体类
2.1 创建UserInfo.cs类，用户信息实体类。
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Data; namespace MyStudy.Model { /// /// 用户信息实体类 /// public class UserInfo { public int UserId { get; set; } public string UserName { get; set; } public int? Age { get; set; } public string Address { get; set; } public DateTime? CreateTime { get; set; } /// /// 将DataTable转换成List数据 /// public static List ToList(DataSet dataSet) { List userList = new List (); if (dataSet != null && dataSet.Tables.Count > 0) { foreach (DataRow row in dataSet.Tables[0].Rows) { UserInfo user = new UserInfo(); if (dataSet.Tables[0].Columns.Contains("UserId") && !Convert.IsDBNull(row["UserId"])) user.UserId = Convert.ToInt32(row["UserId"]); if (dataSet.Tables[0].Columns.Contains("UserName") && !Convert.IsDBNull(row["UserName"])) user.UserName = (string)row["UserName"]; if (dataSet.Tables[0].Columns.Contains("Age") && !Convert.IsDBNull(row["Age"])) user.Age = Convert.ToInt32(row["Age"]); if (dataSet.Tables[0].Columns.Contains("Address") && !Convert.IsDBNull(row["Address"])) user.Address = (string)row["Address"]; if (dataSet.Tables[0].Columns.Contains("CreateTime") && !Convert.IsDBNull(row["CreateTime"])) user.CreateTime = Convert.ToDateTime(row["CreateTime"]); userList.Add(user); } } return userList; } } } 2.2 创建Order.cs类，订单实体类。
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Data; namespace MyStudy.Model { /// /// 订单实体类 /// public class Order { public string OrderNo { get; set; } public string ProductName { get; set; } public int? Quantity { get; set; } public decimal? Money { get; set; } public DateTime? SaleDate { get; set; } /// /// 将DataTable转换成List数据 /// public static List ToList(DataSet dataSet) { List orderList = new List (); if (dataSet != null && dataSet.Tables.Count > 0) { foreach (DataRow row in dataSet.Tables[0].Rows) { Order order = new Order(); if (dataSet.Tables[0].Columns.Contains("OrderNo") && !Convert.IsDBNull(row["OrderNo"])) order.OrderNo = (string)row["OrderNo"]; if (dataSet.Tables[0].Columns.Contains("ProductName") && !Convert.IsDBNull(row["ProductName"])) order.ProductName = (string)row["ProductName"]; if (dataSet.Tables[0].Columns.Contains("Quantity") && !Convert.IsDBNull(row["Quantity"])) order.Quantity = Convert.ToInt32(row["Quantity"]); if (dataSet.Tables[0].Columns.Contains("Money") && !Convert.IsDBNull(row["Money"])) order.Money = Convert.ToDecimal(row["Money"]); if (dataSet.Tables[0].Columns.Contains("SaleDate") && !Convert.IsDBNull(row["SaleDate"])) order.SaleDate = Convert.ToDateTime(row["SaleDate"]); orderList.Add(order); } } return orderList; } } } 3、创建业务逻辑类
3.1 创建UserInfoBLL.cs类，用户信息业务类。
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Data; using MyStudy.Model; using MyStudy.DAL; using System.Data.OleDb; namespace MyStudy.BLL { /// /// 用户信息业务类 /// public class UserInfoBLL { /// /// 查询用户列表 /// public List GetUserList() { List userList = new List (); string sql = "SELECT * FROM [UserInfo$]"; DataSet dateSet = ExcelHelper.GetReader(sql); userList = UserInfo.ToList(dateSet); return userList; } /// /// 获取用户总数 /// public int GetUserCount() { int result = 0; string sql = "SELECT COUNT(*) FROM [UserInfo$]"; result = ExcelHelper.GetScalar(sql); return result; } /// /// 新增用户信息 /// public int AddUserInfo(UserInfo param) { int result = 0; string sql = "INSERT INTO [UserInfo$](UserId,UserName,Age,Address,CreateTime) VALUES(@UserId,@UserName,@Age,@Address,@CreateTime)"; OleDbParameter[] oleDbParam = new OleDbParameter[] { new OleDbParameter("@UserId", param.UserId), new OleDbParameter("@UserName", param.UserName), new OleDbParameter("@Age", param.Age), new OleDbParameter("@Address",param.Address), new OleDbParameter("@CreateTime",param.CreateTime) }; result = ExcelHelper.ExecuteCommand(sql, oleDbParam); return result; } /// /// 修改用户信息 /// public int UpdateUserInfo(UserInfo param) { int result = 0; if (param.UserId > 0) { string sql = "UPDATE [UserInfo$] SET UserName=@UserName,Age=@Age,Address=@Address WHERE UserId=@UserId"; OleDbParameter[] sqlParam = new OleDbParameter[] { new OleDbParameter("@UserId",param.UserId), new OleDbParameter("@UserName", param.UserName), new OleDbParameter("@Age", param.Age), new OleDbParameter("@Address",param.Address) }; result = ExcelHelper.ExecuteCommand(sql, sqlParam); } return result; } /// /// 删除用户信息 /// public int DeleteUserInfo(UserInfo param) { int result = 0; if (param.UserId > 0) { string sql = "DELETE [UserInfo$] WHERE UserId=@UserId"; OleDbParameter[] sqlParam = new OleDbParameter[] { new OleDbParameter("@UserId",param.UserId), }; result = ExcelHelper.ExecuteCommand(sql, sqlParam); } return result; } } } 3.2 创建OrderBLL.cs类，订单业务类
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Data; using MyStudy.Model; using MyStudy.DAL; using System.Data.OleDb; namespace MyStudy.BLL { /// /// 订单业务类 /// public class OrderBLL { /// /// 查询订单列表 /// public List GetOrderList() { List orderList = new List (); string sql = "SELECT * FROM [Order$]"; DataSet dateSet = ExcelHelper.GetReader(sql); orderList = Order.ToList(dateSet); return orderList; } /// /// 获取订单总数 /// public int GetOrderCount() { int result = 0; string sql = "SELECT COUNT(*) FROM [Order$]"; result = ExcelHelper.GetScalar(sql); return result; } /// /// 新增订单 /// public int AddOrder(Order param) { int result = 0; string sql = "INSERT INTO [Order$](OrderNo,ProductName,Quantity,Money,SaleDate) VALUES(@OrderNo,@ProductName,@Quantity,@Money,@SaleDate)"; OleDbParameter[] oleDbParam = new OleDbParameter[] { new OleDbParameter("@OrderNo", param.OrderNo), new OleDbParameter("@ProductName", param.ProductName), new OleDbParameter("@Quantity", param.Quantity), new OleDbParameter("@Money",param.Money), new OleDbParameter("@SaleDate",param.SaleDate) }; result = ExcelHelper.ExecuteCommand(sql, oleDbParam); return result; } /// /// 修改订单 /// public int UpdateOrder(Order param) { int result = 0; if (!String.IsNullOrEmpty(param.OrderNo)) { string sql = "UPDATE [Order$] SET ProductName=@ProductName,Quantity=@Quantity,Money=@Money WHERE OrderNo=@OrderNo"; OleDbParameter[] sqlParam = new OleDbParameter[] { new OleDbParameter("@OrderNo",param.OrderNo), new OleDbParameter("@ProductName",param.ProductName), new OleDbParameter("@Quantity", param.Quantity), new OleDbParameter("@Money", param.Money) }; result = ExcelHelper.ExecuteCommand(sql, sqlParam); } return result; } /// /// 删除订单 /// public int DeleteOrder(Order param) { int result = 0; if (!String.IsNullOrEmpty(param.OrderNo)) { string sql = "DELETE [Order$] WHERE OrderNo=@OrderNo"; OleDbParameter[] sqlParam = new OleDbParameter[] { new OleDbParameter("@OrderNo",param.OrderNo), }; result = ExcelHelper.ExecuteCommand(sql, sqlParam); } return result; } } }