ASP.NET 从Excel文件导入数据到数据库(笔记)

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Text;
using System.Data.OleDb;
using System.IO;

public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
this.initPage();
}
/// <summary>
/// 通过ViewState保存一个DataTable.用来在现实之后添加到数据库
/// </summary>
public DataTable SamplDataTable
{
get
{
if (ViewState["SamplDataTable"] == null)
return new DataTable();
return (DataTable)ViewState["SamplDataTable"];
}
set
{
ViewState["SamplDataTable"] = value;
}
}
private void initPage()
{
this.errorDiv.Visible = false;
this.confrimDiv.Visible = false;
}
protected void btnImport_Click(object sender, EventArgs e)
{
///取得文件名
string fileName = this.excelFile.FileName;
//绝对路径
string path = "~/Excel/" + fileName;
path = Server.MapPath(path);
try
{
//暂时保存在服务上
this.excelFile.SaveAs(path);
///读取指定路径 Excel 文件中的内容转换成DataTable
DataTable excelDT = ImportToDataSet(path);

//声明错误信息字符串
StringBuilder errorBuiler = new StringBuilder();
///检查 存储在内存中的 Excel DataTable
if (Validate(excelDT, errorBuiler))
{
//如果检查通过,使用ViewState保存DataSet中数据,在保存到数据库的时候用到
SamplDataTable = excelDT;
//页面GridView数据绑定,用来显示从Excel读取出来的数据供用户确认
this.GVConfirm.DataSource = SamplDataTable;
this.GVConfirm.DataBind();
this.confrimDiv.Visible = true;
this.buttonDiv.Visible = true;
}
else
{//如果检测没有通过,输出相关错误信息
this.errorDiv.Visible = true;
this.errorArea.Value = errorBuiler.ToString();
}
}
catch (Exception ex)
{
this.errorDiv.Visible = true;
this.errorArea.Value = ex.Message;
}
finally
{
//关闭,删除 文件
if (File.Exists(path))
File.Delete(path);
}
}
/// <summary>
/// 验证指定的Excel规则(列数)
/// </summary>
/// <param name="excelDT"></param>
/// <param name="errorBuiler"></param>
/// <returns></returns>
public bool Validate(DataTable excelDT, StringBuilder errorBuiler)
{
bool result = true;
if (excelDT.Columns.Count != 5)//假设是5列
{
result = false;
int difference = excelDT.Columns.Count - 5;
if (difference > 0)
errorBuiler.AppendLine("要导入的Excel多" + difference.ToString() + "列");
else
errorBuiler.AppendLine("要导入的Excel少" + (-difference).ToString() + "列");
}
else
{
//foreach (DataRow row in excelDT.Rows)
//{
//    if (Exists(row[0].ToString()))
//    {
//        result = false;
//        errorBuiler.AppendLine("内容 " + "'" + row[2].ToString() + "'" + "已存在！");
//    }
//}
}
return result;
}

protected void btnConfirm_Click(object sender, EventArgs e)
{
///将GridView中显示的数据(其实是保存在VIewState中)写入到数据库中
if (AddDataTable(SamplDataTable, 0))
{
Page.ClientScript.RegisterStartupScript(Page.GetType(), "insertSuccess", "<script>alert('导入成功！');window.location.href='Default.aspx';</script>");
}
else
{
Page.ClientScript.RegisterStartupScript(Page.GetType(), "insertFailure", "<script>alert('导入失败！请重试');</script>");
}
}
private bool AddDataTable(DataTable dt, int p)
{
bool result = true;
string sql = BuilderInsertSql(dt, p);
try
{
//执行sql语句 DbHelper.ExecuteSql();
return true;
}
catch
{
result = false;
}
return result; ;
}

private string BuilderInsertSql(DataTable dt, int p)
{
//遍历DataTable拼接添加字符串
return "";
}

private bool AddDataTable(DataTable SamplDataTable, object p, int p_3)
{
throw new Exception("The method or operation is not implemented.");
}
/// <summary>
/// 读取指定路径的Excel内容到DataTable中
/// </summary>
/// <param name="path"></param>
/// <returns></returns>
public DataTable ImportToDataSet(string path)
{
string strConn = "Provider=Microsoft.Ace.OleDb.12.0;" + "Data Source=" + path + ";" + "Extended Properties='Excel 12.0;HDR=Yes;IMEX=1';";
OleDbConnection conn = new OleDbConnection(strConn);
try
{
DataTable dt = new DataTable();
if (conn.State != ConnectionState.Open)
conn.Open();
string strExcel = "select * from [Sheet1$]";
OleDbDataAdapter adapter = new OleDbDataAdapter(strExcel, conn);
adapter.Fill(dt);
return dt;
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
finally
{
if (conn.State != ConnectionState.Closed)
conn.Close();
}
}
}