[ADO.NET] 如何 使用 OLE DB 讀寫 Excel / 建立 Excel 檔案 (一)
相關文章[C# .Net] Microsoft.Office.Interop.Excel 讀 / 寫 Excel 語法概全
1.OLE DB的連線字串如下：
//連線字串
string cs =
"Data Source=" + FileName + ";" +
"Provider=" + ProviderName +
"Extended Properties=" + ExtendedString +
"HDR=" + Hdr +
"IMEX=" + IMEX;
1.1 "Data Source"：檔案來源
1.2 "Provider"：提供者名稱
1.3 "Extended Properties"：Excel版本，Excel 8.0 針對Excel2000及以上版本，Excel5.0 針對Excel97。
1.4 "HDR"：第一行是否為標題
1.5 "IMEX" ：通知驅動程序始終將「互混」數據列作為文本讀取
//定義OLE======================================================
//1.檔案位置
private const string FileName = "C:\\test.xls";
//2.提供者名稱
private const string ProviderName = "Microsoft.Jet.OLEDB.4.0;";
//3.Excel版本，Excel 8.0 針對Excel2000及以上版本，Excel5.0 針對Excel97。
private const string ExtendedString = "'Excel 8.0;";
//4.第一行是否為標題
private const string Hdr = "Yes;";
//5.IMEX=1 通知驅動程序始終將「互混」數據列作為文本讀取
private const string IMEX = "0';";
//=============================================================
//連線字串
string cs =
"Data Source=" + FileName + ";" +
"Provider=" + ProviderName +
"Extended Properties=" + ExtendedString +
"HDR=" + Hdr +
"IMEX=" + IMEX;
2.工作表需加$，如
string strCom = " SELECT * FROM [test$] "
3.使用OLE DB讀取合併儲存格可能會發生不可預期的錯誤。
4.Extended Properties參數若有多項時，記得必須用單引號括起來阿
如何讀取Excel
法一：逐行讀取
private void button2_Click(object sender, EventArgs e)
{
this.listBox1.Items.Clear();
using (OleDbConnection cn = new OleDbConnection(cs))
{
cn.Open();
//工作表名稱需要加$字串
string qs = "select * from[" + SheetName + "$]";
try
{
using (OleDbCommand cmd = new OleDbCommand(qs, cn))
{
using (OleDbDataReader dr = cmd.ExecuteReader())
{
while (dr.Read())
{
int Col = dr.FieldCount;
this.listBox1.Items.Add(dr[0].ToString() + "\t" + dr[1].ToString() + "\t" + dr[2].ToString());
}
}
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
}
法二：利用資料繫結
private void button3_Click(object sender, EventArgs e)
{
using (OleDbConnection cn = new OleDbConnection(cs))
{
cn.Open();
string qs = "select * from[" + SheetName + "$]";
try
{
using (OleDbDataAdapter dr = new OleDbDataAdapter(qs,cn))
{
DataTable dt=new DataTable();
dr.Fill(dt);
this.dataGridView1.DataSource = dt;
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
}
如何列舉EXCEL工作表，判斷工作表是否存在
using (DataTable dt = cn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null))
{
//取得工作表數量，法一
foreach (DataRow dr in dt.Rows)
{
Console.WriteLine((String)dr["TABLE_NAME"]);
}
//取得工作表數量，法二
int TableCount = dt.Rows.Count;
for (int i = 1; i < TableCount; i++)
{
string sn = dt.Rows[i][2].ToString().Trim();
Console.WriteLine(sn);
if (sn == SheetName + "$")
{
//判斷工作表是否存在
SheetNameExist = true;
break;
}
}
如何建立工作表
//建立工作表
string qs = "CREATE TABLE [" + SheetName + "] ([ID] INTEGER,[Username] VarChar,[UserPwd] VarChar)";
//qs = "CREATE TABLE TestSheet ([ID] INTEGER,[Username] VarChar,[UserPwd] VarChar)";
using (OleDbCommand cmd = new OleDbCommand(qs, cn))
{
//新增Excel工作表
cmd.ExecuteNonQuery();
//增加資料
cmd.CommandText = "INSERT INTO [" + SheetName + "$] VALUES(1,'elmer','password')";
cmd.ExecuteNonQuery();
}
如何插入一列
string qs = "INSERT INTO [" + SheetName + "$] VALUES(1,'elmer','password')";
using (OleDbCommand cmd = new OleDbCommand(qs, cn))
{
//增加資料
cmd.ExecuteNonQuery();
}
5.範例已包含VB與C#：OLEDB_Excel.rar
若有謬誤，煩請告知，新手發帖請多包涵
Microsoft MVP Award 2010~2017 C# 第四季
Microsoft MVP Award 2018~2022 .NET
