c# 操作excel文件（csv、数据库）

1、把csv文件中的数据读到datatable中

public static DataTable ImportCSV(string filePath)

{

DataTable ds = new DataTable();

using (StreamReader sw = new StreamReader(filePath,Encoding.Default))

{

string str = sw.ReadLine();

string[] columns = str.Split(',');

foreach (string name in columns)

{

ds.Columns.Add(name);

}

string line = sw.ReadLine();

while (line != null)

{

string[] data = line.Split(',');

ds.Rows.Add(data);

line = sw.ReadLine();

}

sw.Close();

}

return ds;

}

2、把csv的数据导入到数据库中

public static void ImportCSVToDB(string filePath, string type, string dbTable)

{

string sqlString = "BULT insert " + dbTable + " from '" + filePath + "' WITH(FILEDTERMINATOR=',',ROWTERMINATOR='\n')";

using (SqlConnection conn = GetConn(conStr))

{

conn.Open();

SqlCommand command = new SqlCommand(sqlString, conn);

return command.ExecuteNonQuery();

}

}

3、excel的数据读入datatable中

public static DataTable ImportXLS(string filePath)

{

string fileName = System.IO.Path.GetFileName(filePath);

string path = System.IO.Path.GetDirectoryName(filePath);

string strCon = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + filePath + ";Extended Properties = 'Excel 8.0;HDR=YES;IMEX=1;'";

DataTable ds = new DataTable();

using (OleDbConnection conn = new OleDbConnection(strCon))

{

conn.Open();

OleDbDataAdapter adpt = new OleDbDataAdapter("select * from [Sheet1$]", conn);

adpt.Fill(ds);

}

return ds;

}

4、导出数据到csv文件中。（这种方式速度快）

public static void ExportToCSV(DataTable ds, string filePath)

{

using (StreamWriter sw = new StreamWriter(filePath, false, Encoding.Unicode))

{

for (int i = 0; i < ds.Columns.Count; i++)

{

sw.Write(ds.Columns[i].ColumnName + "\t");

}

sw.Write("\n");

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

{

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

{

sw.Write(ds.Rows[i][j].ToString() + "\t");

}

sw.Write("\n");

}

sw.Close();

}

return ;

}