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我寫了一個函數來保存數據表以CSV文件格式。但問題是,當我調用函數時,函數刪除舊數據並寫入新數據。我只想保留我的舊數據並在文件的末尾寫入新數據。我怎樣才能做到這一點?我的作用是:中修改我的DataTable的功能,以CSV
public void CreateCSVFile(DataTable dt, string strFilePath, bool isFirstRowHeader)
{
StringBuilder sb = new StringBuilder();
if (isFirstRowHeader == true)
{
var columnNames = dt.Columns.Cast<DataColumn>().Select(column => column.ColumnName).ToArray();
sb.AppendLine(string.Join(",", columnNames));
}
foreach (DataRow row in dt.Rows)
{
var fields = row.ItemArray.Select(field => field.ToString()).ToArray();
sb.AppendLine(string.Join(",", fields));
}
File.WriteAllText(strFilePath, sb.ToString());
}