Eecel 开发备忘

Posted 2020-08-24

1、装完读取插件才可以对EXCEL读取

Excel 2010 读取数据插件

https://www.microsoft.com/zh-CN/download/details.aspx?id=13255

 

 

2、ExcelHelper，需要引用Excel COM组件

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

namespace ViewBoard
{
/// <summary>
/// Excel操作类
/// </summary>
/// Microsoft Excel 11.0 Object Library
public class ExcelHelper
{
public static DataTable InputFromExcel(string ExcelFilePath, string TableName)
{
if (!File.Exists(ExcelFilePath))
{
throw new Exception("Excel文件不存在！");
}

//如果数据表名不存在，则数据表名为Excel文件的第一个数据表
ArrayList TableList = new ArrayList();
TableList = GetExcelTables(ExcelFilePath);

if (TableName.IndexOf(TableName) < 0)
{
TableName = TableList[0].ToString().Trim();
}

DataTable table = new DataTable();
OleDbConnection dbcon = new OleDbConnection(@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + ExcelFilePath + ";Extended Properties=Excel 8.0");
OleDbCommand cmd = new OleDbCommand("select * from [" + TableName + "$]", dbcon);
OleDbDataAdapter adapter = new OleDbDataAdapter(cmd);

try
{
if (dbcon.State == ConnectionState.Closed)
{
dbcon.Open();
}
adapter.Fill(table);
}
catch (Exception exp)
{
throw exp;
}
finally
{
if (dbcon.State == ConnectionState.Open)
{
dbcon.Close();
}
}
return table;
}

public static ArrayList GetExcelTables(string ExcelFileName)
{
DataTable dt = new DataTable();
ArrayList TablesList = new ArrayList();
if (File.Exists(ExcelFileName))
{
using (OleDbConnection conn = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Extended Properties=Excel 8.0;Data Source=" + ExcelFileName))
{
try
{
conn.Open();
dt = conn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, new object[] { null, null, null, "TABLE" });
}
catch (Exception exp)
{
throw exp;
}

//获取数据表个数
int tablecount = dt.Rows.Count;
for (int i = 0; i < tablecount; i++)
{
string tablename = dt.Rows[i][2].ToString().Trim().TrimEnd(‘$‘);
if (TablesList.IndexOf(tablename) < 0)
{
TablesList.Add(tablename);
}
}
}
}
return TablesList;
}

public static DataSet ExcelToDataSet(string ExcelFileName)
{
DataSet ds = new DataSet();
DataTable tables = null;
DataTable dt = null;
ArrayList TablesList = new ArrayList();
if (File.Exists(ExcelFileName))
{
using (OleDbConnection conn = new OleDbConnection(@"Provider=Microsoft.ACE.OLEDB.12.0;Extended Properties=Excel 12.0;Data Source=" + ExcelFileName))
{
try
{
conn.Open();
tables = conn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, new object[] { null, null, null, "TABLE" });
for (int i = 0; i < tables.Rows.Count; i++)
{
string sql = "select * from [" + tables.Rows[i][2] + "];";
OleDbCommand cmd = new OleDbCommand(sql, conn);
OleDbDataAdapter adapter = new OleDbDataAdapter(cmd);

dt = new DataTable();
dt.TableName = tables.Rows[i][2].ToString().Replace("$", "");
adapter.Fill(dt);
ds.Tables.Add(dt);
}
}
catch (Exception exp)
{
throw exp;
}
finally {
if (conn.State == ConnectionState.Open)
{
conn.Close();
}
}
}

}
return ds;
}
}
}