功能
1.写入
2.读取
导出文件效果
调用示例
注意示例中的ToDataTable()方法是自己的封装的扩展方法，源码在集合扩展方法-CSDN博客
private List<MarkDataModel> createMarkDataList(int count)
{
var markDataModels = new List<MarkDataModel>();
for (int i = 0; i < count; i++)
{
markDataModels.Add(new MarkDataModel()
{
X = i + 1,
Y = i + 1,
Text = "Data" + i + "_" + DateTime.Now.ToString("HHmmssfff")
});
}
return markDataModels;
}
/// <summary>
/// 写入
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btnWrite_Click(object sender, EventArgs e)
{
var dataList = createMarkDataList(10);
//var filePath = AppContext.BaseDirectory + @"WeldResultUpload\" + DateTime.Now.ToString("yyyyMMdd") + @"\" + Global.GlobalIns.MaterialsCodeCurrent + ".xlsx";
string currentDirectory = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location);
currentDirectory += @"ResultUpload\" + DateTime.Now.ToString("yyyyMMdd") + ".csv";
CsvHelper.SaveCSV(dataList.ToDataTable(), currentDirectory);
var dataList2 = createMarkDataList(20);
CsvHelper.SaveCSV(dataList2.ToDataTable(), currentDirectory);
MessageBox.Show("导出完成");
}Csv文件帮助类
using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Text;
using System.IO;
namespace CSVWinFormsApp
{
/// <summary>
/// Csv文件帮助类
/// </summary>
public class CsvHelper
{
/// <summary>
/// 写入CSV文件
/// </summary>
/// <param name="dt">要写入的数据表</param>
/// <param name="fullPath">保存的文件路径，注意包含文件名</param>
public static void SaveCSV(DataTable dt, string fullPath)
{
try
{
FileInfo fi = new FileInfo(fullPath);
//判断文件目录是否存在
if (!fi.Directory.Exists)
{
//如果目录不存在就创建目录
fi.Directory.Create();
}
var isExists = File.Exists(fullPath);
//FileMode.Append 如果文件存在追加写入
using (FileStream fs = new FileStream(fullPath, FileMode.Append,
FileAccess.Write))
{
StreamWriter sw = new StreamWriter(fs, System.Text.Encoding.UTF8);
string data = string.Empty;
if (!isExists)
{
for (int i = 0; i < dt.Columns.Count; i++)//写入列名
{
data += dt.Columns[i].ColumnName.ToString();
if (i < dt.Columns.Count - 1)
{
data += ",";
}
}
sw.WriteLine(data);
}
for (int i = 0; i < dt.Rows.Count; i++) //写入各行数据
{
data = string.Empty;
for (int j = 0; j < dt.Columns.Count; j++)
{
string str = dt.Rows[i][j].ToString();
str = str.Replace("\"", "\"\"");//替换英文冒号 英文冒号需要换成两个冒号
if (str.Contains(',') || str.Contains('"')
|| str.Contains('\r') || str.Contains('\n')) //含逗号 冒号 换行符的需要放到引号中
{
str = string.Format("\"{0}\"", str);
}
data += str;
if (j < dt.Columns.Count - 1)
{
data += ",";
}
}
sw.WriteLine(data);
}
//使用了Using可以不手动关闭了。好买书还是关一下的好
sw.Close();
fs.Close();
}
}
catch (Exception ex)
{
}
}
/// <summary>
/// 打开CSV文件
/// </summary>
/// <param name="filePath"></param>
/// <returns></returns>
public static DataTable OpenCSV(string filePath)//从csv读取数据返回table
{
System.Text.Encoding encoding = GetType(filePath); //Encoding.ASCII;//
DataTable dt = new DataTable();
try
{
using (FileStream fs = new FileStream(filePath, FileMode.Open,
FileAccess.Read))
{
StreamReader sr = new StreamReader(fs, encoding);
//记录每次读取的一行记录
string strLine = string.Empty;
//记录每行记录中的各字段内容
string[] aryLine = null;
string[] tableHead = null;
//标示列数
int columnCount = 0;
//标示是否是读取的第一行
bool IsFirst = true;
//逐行读取CSV中的数据
while ((strLine = sr.ReadLine()) != null)
{
if (IsFirst == true)
{
tableHead = strLine.Split(',');
IsFirst = false;
columnCount = tableHead.Length;
//创建列
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";
}
//使用了Using可以不手动关闭了。好买书还是关一下的好
sr.Close();
fs.Close();
}
}
catch (Exception ex)
{
}
return dt;
}
/// <summary>
/// 给定文件的路径，读取文件的二进制数据，判断文件的编码类型
/// </summary>
/// <param name="FILE_NAME">文件路径</param>
/// <returns>文件的编码类型</returns>
public static System.Text.Encoding GetType(string FILE_NAME)
{
FileStream fs = new FileStream(FILE_NAME, FileMode.Open,
FileAccess.Read);
System.Text.Encoding r = GetType(fs);
fs.Close();
return r;
}
/// <summary>
/// 通过给定的文件流，判断文件的编码类型
/// </summary>
/// <param name="fs">文件流</param>
/// <returns>文件的编码类型</returns>
public static System.Text.Encoding GetType(FileStream fs)
{
byte[] Unicode = new byte[] { 0xFF, 0xFE, 0x41 };
byte[] UnicodeBIG = new byte[] { 0xFE, 0xFF, 0x00 };
byte[] UTF8 = new byte[] { 0xEF, 0xBB, 0xBF }; //带BOM
System.Text.Encoding reVal = System.Text.Encoding.Default;
BinaryReader r = new 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;
}
/// <summary>
/// 判断是否是不带 BOM 的 UTF8 格式
/// </summary>
/// <param name="data"></param>
/// <returns></returns>
private static bool IsUTF8Bytes(byte[] data)
{
int charByteCounter = 1; //计算当前正分析的字符应还有的字节数
byte curByte; //当前分析的字节.
for (int i = 0; i < data.Length; i++)
{
curByte = data[i];
if (charByteCounter == 1)
{
if (curByte >= 0x80)
{
//判断当前
while (((curByte <<= 1) & 0x80) != 0)
{
charByteCounter++;
}
//标记位首位若为非0 则至少以2个1开始 如:110XXXXX...........1111110X
if (charByteCounter == 1 || charByteCounter > 6)
{
return false;
}
}
}
else
{
//若是UTF-8 此时第一位必须为1
if ((curByte & 0xC0) != 0x80)
{
return false;
}
charByteCounter--;
}
}
if (charByteCounter > 1)
{
throw new Exception("非预期的byte格式");
}
return true;
}
}
}
集合数据Model
/// <summary>
/// 打标数据 Model
/// </summary>
public class MarkDataModel
{
/// <summary>
/// 坐标X
/// </summary>
[Description("坐标X")]//可以自定义中文列名
public double X { get; set; }
/// <summary>
/// 坐标Y
/// </summary>
public double Y { get; set; }
/// <summary>
/// 打标数据
/// </summary>
public string Text { get; set; }
}
