CSV文件和DataTable对象转换

/// <summary>
/// CSV文件和DataTable对象转换辅助类
/// </summary>
public class CSVHelper
{
/// <summary>
/// CSV转换成DataTable（OleDb数据库访问方式）
/// </summary>
/// <param name="csvPath">csv文件路径</param>
/// <returns></returns>
public static DataTable CSVToDataTableByOledb(string csvPath)
{
DataTable csvdt = new DataTable("csv");
if (!File.Exists(csvPath))
{
throw new FileNotFoundException("csv文件路径不存在!");
}

FileInfo fileInfo = new FileInfo(csvPath);
using (OleDbConnection conn = new OleDbConnection(@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + fileInfo.DirectoryName + ";Extended Properties='Text;'"))
{
OleDbDataAdapter adapter = new OleDbDataAdapter("SELECT * FROM [" + fileInfo.Name + "]", conn);
adapter.Fill(csvdt);
}
return csvdt;
}

/// <summary>
/// CSV转换成DataTable（文件流方式）
/// </summary>
/// <param name="csvPath">csv文件路径</param>
/// <returns></returns>
public static DataTable CSVToDataTableByStreamReader(string csvPath)
{
DataTable csvdt = new DataTable("csv");

int intColCount = 0;
bool blnFlag = true;
DataColumn column;
DataRow row;
string strline = null;
string[] aryline;

using (StreamReader reader = new StreamReader(csvPath, FileUtil.GetEncoding(csvPath)))
{
while (!string.IsNullOrEmpty((strline = reader.ReadLine())))
{
aryline = strline.Split(new char[] { ',' });

if (blnFlag)
{
blnFlag = false;
intColCount = aryline.Length;
for (int i = 0; i < aryline.Length; i++)
{
column = new DataColumn(aryline[i]);
csvdt.Columns.Add(column);
}
continue;
}

row = csvdt.NewRow();
for (int i = 0; i < intColCount; i++)
{
row[i] = aryline[i];
}
csvdt.Rows.Add(row);
}
}

return csvdt;
}

/// <summary>
/// DataTable 生成 CSV
/// </summary>
/// <param name="dt">DataTable</param>
/// <param name="csvPath">csv文件路径</param>
public static void DataTableToCSV(DataTable dt, string csvPath)
{
if (null == dt)
return;

StringBuilder csvText = new StringBuilder();
StringBuilder csvrowText = new StringBuilder();
foreach (DataColumn dc in dt.Columns)
{
csvrowText.Append(",");
csvrowText.Append(dc.ColumnName);
}
csvText.AppendLine(csvrowText.ToString().Substring(1));

foreach (DataRow dr in dt.Rows)
{
csvrowText = new StringBuilder();
foreach (DataColumn dc in dt.Columns)
{
csvrowText.Append(",");
csvrowText.Append(dr[dc.ColumnName].ToString().Replace(',', ' '));
}
csvText.AppendLine(csvrowText.ToString().Substring(1));
}

File.WriteAllText(csvPath, csvText.ToString(), Encoding.Default);
}
}