csv文件与DataTable互相导入处理

封装处理下，以后项目用到可以直接使用，比较简单。

1.首先看封装好的类

using System;

using System.Data;

using System.IO;

using System.Text;

using CSharpUtilHelpV2;

using StringUtilHelp;

namespace DBUtilHelpV2Plus

{

public static class DBToolV2Plus

{

/// <summary>

/// 将DataTable导出到CSV.

/// </summary>

/// <param name="table">DataTable</param>

/// <param name="fullSavePath">保存路径</param>

/// <param name="tableheader">标题信息</param>

/// <param name="columname">列名称『eg:姓名,年龄』</param>

/// <returns>导出成功true;导出失败false</returns>

public static bool ToCSV(this DataTable table, string fullSavePath, string tableheader, string columname)

{

ArgumentChecked(table, fullSavePath);

//------------------------------------------------------------------------------------

try

{

string _bufferLine = "";

using (StreamWriter _writerObj = new StreamWriter(fullSavePath, false, Encoding.UTF8))

{

if (!string.IsNullOrEmpty(tableheader))

_writerObj.WriteLine(tableheader);

if (!string.IsNullOrEmpty(columname))

_writerObj.WriteLine(columname);

for (int i = 0; i < table.Rows.Count; i++)

{

_bufferLine = "";

for (int j = 0; j < table.Columns.Count; j++)

{

if (j > 0)

_bufferLine += ",";

_bufferLine += table.Rows[i][j].ToString();

}

_writerObj.WriteLine(_bufferLine);

}

return true;

}

}

catch (Exception)

{

return false;

}

}

/// <summary>

/// 参数检查

/// </summary>

/// <param name="table"></param>

/// <param name="fullSavePath"></param>

private static void ArgumentChecked(DataTable table, string fullSavePath)

{

if (table == null)

throw new ArgumentNullException("table");

if (string.IsNullOrEmpty(fullSavePath))

throw new ArgumentNullException("fullSavePath");

string _fileName = CSharpToolV2.GetFileNameOnly(fullSavePath);

if (string.IsNullOrEmpty(_fileName))

throw new ArgumentException(string.Format("参数fullSavePath的值{0},不是正确的文件路径!", fullSavePath));

if (!_fileName.InvalidFileNameChars())

throw new ArgumentException(string.Format("参数fullSavePath的值{0},包含非法字符!", fullSavePath));

}

/// <summary>

/// 将CSV文件数据导入到Datable中

/// </summary>

/// <param name="table"></param>

/// <param name="filePath">DataTable</param>

/// <param name="rowIndex">保存路径</param>

/// <returns>Datable</returns>

public static DataTable AppendCSVRecord(this DataTable table, string filePath, int rowIndex)

{

ArgumentChecked(table, filePath);

if (rowIndex < 0)

throw new ArgumentException("rowIndex");

using (StreamReader reader = new StreamReader(filePath, Encoding.UTF8, false))

{

int i = 0, j = 0;

reader.Peek();

while (reader.Peek() > 0)

{

j = j + 1;

string _line = reader.ReadLine();

if (j >= rowIndex + 1)

{

string[] _split = _line.Split(',');

DataRow _row = table.NewRow();

for (i = 0; i < _split.Length; i++)

{

_row[i] = _split[i];

}

table.Rows.Add(_row);

}

}

return table;

}

}

}

}

2.代码使用测试

using System;

using System.Data;

using DBUtilHelpV2;

using DBUtilHelpV2Plus;

namespace DBUtilHelpV2PlusTest

{

class Program

{

static DataTable testDb = null;

static string fullSavePath = string.Format(@"C:\{0}.csv", DateTime.Now.ToString("yyyyMMddHH"));

static void Main(string[] args)

{

try

{

CreateTestDb();

Console.WriteLine(string.Format("DataTable导出到CSV文件{0}.", testDb.ToCSV(fullSavePath, "姓名,年龄", "人员信息表") == true ? "成功" : "失败"));

testDb.Rows.Clear();

Console.WriteLine(string.Format("清空数据,当前{0}条数据.", testDb.Rows.Count));

testDb = testDb.AppendCSVRecord(fullSavePath, 2);

Console.WriteLine(string.Format("CSV文件导入到Datable,导入{0}条数据.", testDb.Rows.Count));

}

catch (Exception ex)

{

Console.WriteLine(ex.Message);

}

finally

{

Console.ReadLine();

}

}

static void CreateTestDb()

{

if (testDb == null)

{

testDb = DBToolV2.CreateTable("Name,Age|int");

for (int i = 1; i <= 10; i++)

{

DataRow _row = testDb.NewRow();

_row["Name"] = string.Format("YanZhiwei_{0}", i);

_row["Age"] = i;

testDb.Rows.Add(_row);

}

}

}

}

}