C#創建、讀取和修改Excel

C#創建、讀取和修改Excel
windows下我們可以通過 Jet OLE DB訪問Excel，就行訪問數據庫一樣

// Namespaces, Variables, and Constants
using System;
using System.Configuration;
using System.Data;

private OleDbDataAdapter da;
private DataTable dt;
private void Excel_Load(object sender, System.EventArgs e)
{
    // Create the DataAdapter.
    da = new OleDbDataAdapter("SELECT * FROM [Sheet1$]", ConfigurationSettings.AppSettings["ExcelConnectString1"]);

// Create the insert command.
String insertSql = "INSERT INTO [Sheet1$] (CategoryID, CategoryName, Description) VALUES (?, ?, ?)";
da.InsertCommand = new OleDbCommand(insertSql, da.SelectCommand.Connection);
da.InsertCommand.Parameters.Add("@CategoryID", OleDbType.Integer, 0, "CategoryID");
da.InsertCommand.Parameters.Add("@CategoryName", OleDbType.Char, 15, "CategoryName");
da.InsertCommand.Parameters.Add("@Description", OleDbType.VarChar, 100, "Description");

// Create the update command.
String updateSql = "UPDATE [Sheet1$] SET CategoryName=?, Description=? " WHERE CategoryID=?";
da.UpdateCommand = new OleDbCommand(updateSql, da.SelectCommand.Connection);
da.UpdateCommand.Parameters.Add("@CategoryName", OleDbType.Char, 15, "CategoryName");
da.UpdateCommand.Parameters.Add("@Description", OleDbType.VarChar, 100, "Description");
da.UpdateCommand.Parameters.Add("@CategoryID", OleDbType.Integer, 0, "CategoryID");

// Fill the table from the Excel spreadsheet.
dt = new DataTable( );
da.Fill(dt);
// Define the primary key.
dt.PrimaryKey = new DataColumn[] {dt.Columns[0]};

// Records can only be inserted using this technique.
dt.DefaultView.AllowDelete = false;
dt.DefaultView.AllowEdit = true;
dt.DefaultView.AllowNew = true;
// Bind the default view of the table to the grid.
dataGrid.DataSource = dt.DefaultView;

}
private void updateButton_Click(object sender, System.EventArgs e)
{
    da.Update(dt);
}</pre>