C#創(chuàng)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(shù)據(jù)庫(kù)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);
}

標(biāo)簽： 數(shù)據(jù)庫(kù)

版權(quán)申明：本站文章部分自網(wǎng)絡(luò)，如有侵權(quán)，請(qǐng)聯(lián)系：west999com@outlook.com
特別注意：本站所有轉(zhuǎn)載文章言論不代表本站觀點(diǎn)！
本站所提供的圖片等素材，版權(quán)歸原作者所有，如需使用，請(qǐng)與原作者聯(lián)系。