C# CSV文件的導入導出以及datatable轉化csv

1.csv文件寫入操做

首先，建立datatable對象：

DataTable dt = new DataTable();

添加列：

dt.Columns.Add("name", typeof(string));

添加一個DataRow 對象，用於添加行：

DataRow dr = dt.NewRow();

dr[0] = "pingg";

dt.Rows.Add(dr);

CSVFileHelper.SaveCSV(dt, GetAppPath() + "/name.csv");

 

這樣，就添加了一行一列：name pingg

 

2.csv文件讀取操做

建立一個datatable用來讀取csv：

DataTable dtread = CSVFileHelper.OpenCSV(GetAppPath() + "/name.csv");

DataRow drread = dtread.Rows[0];

//drread[0]就是第一行的數據：pingg

 

 3.CSVFileHelper.cs類文件：

using System;
using System.Collections.Generic;
using System.Data;
using System.IO;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace Common
{
public class CSVFileHelper
{
/// <summary>
/// 將DataTable中數據寫入到CSV文件中
/// </summary>
/// <param name="dt">提供保存數據的DataTable</param>
/// <param name="fileName">CSV的文件路徑</param>
public static void SaveCSV(DataTable dt, string fullPath)
{
FileInfo fi = new FileInfo(fullPath);
if (!fi.Directory.Exists)
{
fi.Directory.Create();
}
FileStream fs = new FileStream(fullPath, System.IO.FileMode.Create, System.IO.FileAccess.Write);
//StreamWriter sw = new StreamWriter(fs, System.Text.Encoding.Default);
StreamWriter sw = new StreamWriter(fs, System.Text.Encoding.UTF8);
string data = "";
//寫出列名稱
for (int i = 0; i < dt.Columns.Count; i++)
{
data += dt.Columns[i].ColumnName.ToString();
if (i < dt.Columns.Count - 1)
{
data += ",";
}
}
sw.WriteLine(data);
//寫出各行數據
for (int i = 0; i < dt.Rows.Count; i++)
{
data = "";
for (int j = 0; j < dt.Columns.Count; j++)
{
string str = dt.Rows[i][j].ToString();
str = str.Replace("\"", "\"\"");//替換英文冒號 英文冒號須要換成兩個冒號
if (str.Contains(',') || str.Contains('"')
|| str.Contains('\r') || str.Contains('\n')) //含逗號 冒號 換行符的須要放到引號中
{
str = string.Format("\"{0}\"", str);
}

data += str;
if (j < dt.Columns.Count - 1)
{
data += ",";
}
}
sw.WriteLine(data);
}
sw.Close();
fs.Close();
// DialogResult result = MessageBox.Show("CSV文件保存成功！");
//if (result == DialogResult.OK)
//{
// System.Diagnostics.Process.Start("explorer.exe", Common.PATH_LANG);
//}
}
/// 給定文件的路徑，讀取文件的二進制數據，判斷文件的編碼類型
/// <param name="FILE_NAME">文件路徑</param>
/// <returns>文件的編碼類型</returns>

public static System.Text.Encoding GetType(string FILE_NAME)
{
System.IO.FileStream fs = new System.IO.FileStream(FILE_NAME, System.IO.FileMode.Open,
System.IO.FileAccess.Read);
System.Text.Encoding r = GetType(fs);
fs.Close();
return r;
}
/// 經過給定的文件流，判斷文件的編碼類型
/// <param name="fs">文件流</param>
/// <returns>文件的編碼類型</returns>
public static System.Text.Encoding GetType(System.IO.FileStream fs)
{
byte[] Unicode = new byte[] { 0xFF, 0xFE, 0x41 };
byte[] UnicodeBIG = new byte[] { 0xFE, 0xFF, 0x00 };
byte[] UTF8 = new byte[] { 0xEF, 0xBB, 0xBF }; //帶BOM
System.Text.Encoding reVal = System.Text.Encoding.Default;

System.IO.BinaryReader r = new System.IO.BinaryReader(fs, System.Text.Encoding.Default);
int i;
int.TryParse(fs.Length.ToString(), out i);
byte[] ss = r.ReadBytes(i);
if (IsUTF8Bytes(ss) || (ss[0] == 0xEF && ss[1] == 0xBB && ss[2] == 0xBF))
{
reVal = System.Text.Encoding.UTF8;
}
else if (ss[0] == 0xFE && ss[1] == 0xFF && ss[2] == 0x00)
{
reVal = System.Text.Encoding.BigEndianUnicode;
}
else if (ss[0] == 0xFF && ss[1] == 0xFE && ss[2] == 0x41)
{
reVal = System.Text.Encoding.Unicode;
}
r.Close();
return reVal;
}
/// 判斷是不是不帶 BOM 的 UTF8 格式
/// <param name="data"></param>
/// <returns></returns>
private static bool IsUTF8Bytes(byte[] data)
{
int charByteCounter = 1;　 //計算當前正分析的字符應還有的字節數
byte curByte; //當前分析的字節.
for (int i = 0; i < data.Length; i++)
{
curByte = data[i];
if (charByteCounter == 1)
{
if (curByte >= 0x80)
{
//判斷當前
while (((curByte <<= 1) & 0x80) != 0)
{
charByteCounter++;
}
//標記位首位若爲非0 則至少以2個1開始 如:110XXXXX...........1111110X　
if (charByteCounter == 1 || charByteCounter > 6)
{
return false;
}
}
}
else
{
//如果UTF-8 此時第一位必須爲1
if ((curByte & 0xC0) != 0x80)
{
return false;
}
charByteCounter--;
}
}
if (charByteCounter > 1)
{
throw new Exception("非預期的byte格式");
}
return true;
}
/// <summary>
/// 將CSV文件的數據讀取到DataTable中
/// </summary>
/// <param name="fileName">CSV文件路徑</param>
/// <returns>返回讀取了CSV數據的DataTable</returns>
public static DataTable OpenCSV(string filePath)
{
Encoding encoding = GetType(filePath); //Encoding.ASCII;//
DataTable dt = new DataTable();
FileStream fs = new FileStream(filePath, System.IO.FileMode.Open, System.IO.FileAccess.Read);

//StreamReader sr = new StreamReader(fs, Encoding.UTF8);
StreamReader sr = new StreamReader(fs, encoding);
//string fileContent = sr.ReadToEnd();
//encoding = sr.CurrentEncoding;
//記錄每次讀取的一行記錄
string strLine = "";
//記錄每行記錄中的各字段內容
string[] aryLine = null;
string[] tableHead = null;
//標示列數
int columnCount = 0;
//標示是不是讀取的第一行
bool IsFirst = true;
//逐行讀取CSV中的數據
while ((strLine = sr.ReadLine()) != null)
{
//strLine = Common.ConvertStringUTF8(strLine, encoding);
//strLine = Common.ConvertStringUTF8(strLine);

if (IsFirst == true)
{
tableHead = strLine.Split(',');
IsFirst = false;
columnCount = tableHead.Length;
//建立列
for (int i = 0; i < columnCount; i++)
{
DataColumn dc = new DataColumn(tableHead[i]);
dt.Columns.Add(dc);
}
}
else
{
aryLine = strLine.Split(',');
DataRow dr = dt.NewRow();
for (int j = 0; j < columnCount; j++)
{
dr[j] = aryLine[j];
}
dt.Rows.Add(dr);
}
}
if (aryLine != null && aryLine.Length > 0)
{
dt.DefaultView.Sort = tableHead[0] + " " + "asc";
}

sr.Close();
fs.Close();
return dt;
}
public static string GetAppPath()
{
try
{
string _CodeBase = System.Reflection.Assembly.GetExecutingAssembly().CodeBase;
_CodeBase = _CodeBase.Substring(8, _CodeBase.Length - 8); // 8是 file:// 的長度
string[] arrSection = _CodeBase.Split(new char[] { '/' });
string _FolderPath = "";
for (int i = 0; i < arrSection.Length - 1; i++)
{
_FolderPath += arrSection[i] + "/";
}
return _FolderPath.Replace("/", @"\");
}
catch
{
return null;
}
}
}
}