今天在別人的系統上做一個擴展小東東，其中有很多地方將DataSet中的數據導成csv文件，同時要求也能從csv文件直接導入數據，在網上查閱了一些相關資料總算搞定了，現簡單寫下來以備后用同時也希望能給有相同需求的朋友一定的幫助：
using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.Data.Common;
using System.Data.OleDb;
using System.Windows.Forms;
using System.IO;
namespace XRSoft.Client.Common
{
/// <summary>
/// 將DataSet寫成CSV文件
/// </summary>
public class DataSet2CSV
{
#region 001----將DataSet轉換成CSV文件
public static void Export2CSV(DataSet ds, string tableName, bool containColumName, string fileName)
{
string csvStr = ConverDataSet2CSV(ds,tableName,containColumName);
if(csvStr=="") return;
FileStream fs = new FileStream(fileName, FileMode.Create, FileAccess.ReadWrite);
//將string轉換成byte[]
byte[] csvArray = System.Text.Encoding.ASCII.GetBytes(csvStr.ToCharArray(), 0, csvStr.Length - 1);
fs.Write(csvArray,0,csvStr.Length - 1);
fs.Close();
fs = null;
}
/// <summary>
/// 將指定的數據集中指定的表轉換成CSV字符串
/// </summary>
/// <param name="ds"></param>
/// <param name="tableName"></param>
/// <returns></returns>
private static string ConverDataSet2CSV(DataSet ds, string tableName,bool containColumName)
{
//首先判斷數據集中是否包含指定的表
if (ds == null || !ds.Tables.Contains(tableName))
{
MessageBox.Show("指定的數據集為空或不包含要寫出的數據表！", "系統提示：", MessageBoxButtons.OK, MessageBoxIcon.Stop);
return "";
}
string csvStr = "";
//下面寫出數據
DataTable tb = ds.Tables[tableName];
//寫表名
//csvStr += tb.TableName + "\n";
//第一步：寫出列名
if (containColumName)
{
foreach (DataColumn column in tb.Columns)
{
csvStr += "\""+column.ColumnName +"\"" +",";
}
//去掉最后一個","
csvStr = csvStr.Remove(csvStr.LastIndexOf(","), 1);
csvStr += "\n";
}
//第二步：寫出數據
foreach (DataRow row in tb.Rows)
{
foreach (DataColumn column in tb.Columns)
{
csvStr += "\"" + row[column].ToString() + "\"" + ",";
}
csvStr = csvStr.Remove(csvStr.LastIndexOf(","), 1);
csvStr += "\n";
}
return csvStr;
}
#endregion
#region 002----從CSV文件填充DataSet
public static DataSet ConverCSV2DataSet(string fileName, string tableName)
{
DataSet ds = new DataSet();
string _filePath, _fileName;
_filePath = fileName.Substring(0, fileName.LastIndexOf(@"\") + 1);
_fileName = fileName.Substring(fileName.LastIndexOf(@"\")+1);
string conStr = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source= " + _filePath + @"\" + ";Extended Properties=\"Text;HDR=Yes;FMT=Delimited\"";
OleDbConnection oleCon = new OleDbConnection(conStr);
OleDbDataAdapter da = new OleDbDataAdapter("Select * from " + _fileName,oleCon);
da.Fill(ds,tableName);
oleCon.Close();
return ds;
}
#endregion
}
}
下面是導出、和導入數據的調用方法：
//1、導出
private void button1_Click(object sender, EventArgs e)
{
if (this.dsMaster != null && dsMaster.Tables.Contains("CUSTOMER"))
{
this.saveFileDialog1.AddExtension = true;
this.saveFileDialog1.CreatePrompt = true;
this.saveFileDialog1.Filter = "CSV FILE(*.csv)|*.csv";
DialogResult result = this.saveFileDialog1.ShowDialog();
this.saveFileDialog1.RestoreDirectory = true;
if (result == DialogResult.OK)
{
DataSet2CSV.Export2CSV(this.dsMaster, "CUSTOMER", true, this.saveFileDialog1.FileName);
}
}
}
//2、導入
private void button2_Click(object sender, EventArgs e)
{
//導入數據
DataSet ds ;
this.openFileDialog1.Filter = @"CSV FILES(*.csv)|*.csv";
DialogResult result = this.openFileDialog1.ShowDialog();
if (result == DialogResult.OK)
{
ds = DataSet2CSV.ConverCSV2DataSet(this.openFileDialog1.FileName, "CUSTOMER");
if (ds != null && ds.Tables.Contains("CUSTOMER"))
{
this.dataGridView1.DataSource = ds.Tables["CUSTOMER"].DefaultView;
}
}
}
以上是我剛剛隨便測試寫的代碼，不妥之處敬請批評批正，謝謝!