DataTable 轉換成 CSV 與 CSV 轉換成 DataTable

參考引用來源
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DataTable 轉成 CSV 檔函式程式碼如下：
public void CreateCSVFile(DataTable dt, string strFilePath) // strFilePath 為輸出檔案路徑 (含檔名)
{
    StreamWriter sw = new StreamWriter(strFilePath, false);

    int intColCount = dt.Columns.Count;

    if (dt.Columns.Count > 0)
        sw.Write(dt.Columns[0]);
    for (int i = 1; i < dt.Columns.Count; i++)
        sw.Write("," + dt.Columns[i]);

    sw.Write(sw.NewLine);
    foreach (DataRow dr in dt.Rows)
    {
        if (dt.Columns.Count > 0 && !Convert.IsDBNull(dr[0]))
            sw.Write(Encode(Convert.ToString(dr[0])));
        for (int i = 1; i < intColCount; i++)
            sw.Write("," + Encode(Convert.ToString(dr[i])));
        sw.Write(sw.NewLine);
    }
    sw.Close();
}

public string Encode(string strEnc)
{
    return System.Web.HttpUtility.UrlEncode(strEnc);
}



讀取 CSV 轉成 DataTable 函式程式碼如下：
public DataTable ReadCSVFile(string strFilePath, string strFileName) // strFilePath 為檔案所在資料夾，strFileName 為檔案名稱
{
    OleDbConnection connection = new OleDbConnection(string.Format(@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source={0}; Extended Properties=""text;HDR=Yes;FMT=Delimited"";", strFilePath));
    OleDbCommand command = new OleDbCommand("SELECT * FROM " + strFileName, connection);
    OleDbDataAdapter adapter = new OleDbDataAdapter(command);
    DataTable dt = new DataTable();

    adapter.Fill(dt);

    return dt;
}