我想从txt文件中提取数据并将其放入DataTable中。 txt文件中的内容采用以下格式:
sometext1:sometext2:sometext3
sometext4:sometext5:sometext6
sometext7:sometext8:sometext9
...
每一行代表一行,每一列用“:”字符分隔。
我试过这样做:
DataTable tbl = new DataTable();
using (StreamWriter sw = File.CreateText(path))
{
string[] rows = content.Split('\n');
foreach (string s in rows)
{
string[] columns = s.Split(':');
foreach (string t in columns)
{
sw.WriteLine(t);
}
}
}
如何阅读此文件并将其添加到DataTable?
答案 0 :(得分:12)
这是一种简单的方法来完成你的工作
public DataTable ConvertToDataTable (string filePath, int numberOfColumns)
{
DataTable tbl = new DataTable();
for(int col =0; col < numberOfColumns; col++)
tbl.Columns.Add(new DataColumn("Column" + (col+1).ToString()));
string[] lines = System.IO.File.ReadAllLines(filePath);
foreach(string line in lines)
{
var cols = line.Split(':');
DataRow dr = tbl.NewRow();
for(int cIndex=0; cIndex < 3; cIndex++)
{
dr[cIndex] = cols[cIndex];
}
tbl.Rows.Add(dr);
}
return tbl;
}
答案 1 :(得分:3)
这是一个优秀的类,它将使用数据结构将CSV数据复制到数据表中以创建DataTable:
http://www.codeproject.com/Articles/11698/A-Portable-and-Efficient-Generic-Parser-for-Flat-F
此主题也在这里讨论过: How to read a CSV file into a .NET Datatable
但是,如果您愿意自己编写代码,可以举一个例子:
Dim csvFileFolder As String = "C:\YourFileFolder"
Dim csvFileName As String = "YourFile.csv"
'Note that the folder is specified in the connection string,
'not the file. That's specified in the SELECT query, later.
Dim connString As String = "Driver={Microsoft Text Driver (*.txt; *.csv)};Dbq=" _
& csvFileFolder & ";Extended Properties=""Text;HDR=No;FMT=Delimited"""
Dim conn As New Odbc.OdbcConnection(connString)
'Open a data adapter, specifying the file name to load
Dim da As New Odbc.OdbcDataAdapter("SELECT * FROM [" & csvFileName & "]", conn)
'Then fill a data table, which can be bound to a grid
Dim dt As New DataTableda.Fill(dt)
这是在VB.NET中,如果你不能将它翻译成C#,请告诉我。
问候。
答案 2 :(得分:0)
好吧,你可能在这里有你的数据:
string[] rows = content.Split('\n');
foreach (string s in rows)
{
string[] columns = s.Split(':');
foreach (string t in columns)
{
// each data element
}
}
如果您定义了DataTable
,则可以使用非常相似的构造向其添加行。我不知道你桌子的结构,但基本上你可以这样做:
string[] rows = content.Split('\n');
foreach (string s in rows)
{
string[] columns = s.Split(':');
var dataRow = someDataTable.NewRow();
dataRow["someColumnName"] = columns[0];
dataRow["anotherColumnName"] = columns[1];
dataRow["someOtherColumnName"] = columns[2];
// and so on...
someDataTable.Rows.Add(dataRow);
}
如果DataTable
列没有强名称,您还可以按索引添加项目:
dataRow.Item[0] = columns[0];
dataRow.Item[1] = columns[1];
// and so on...
答案 3 :(得分:0)
以下内容将执行您概述的整个过程。
var table = new DataTable();
var fileContents = File.ReadAllLines("yourFile");
var splitFileContents = (from f in fileContents select f.Split(':')).ToArray();
int maxLength = (from s in splitFileContents select s.Count()).Max();
for (int i = 0; i < maxLength; i++)
{
table.Columns.Add();
}
foreach (var line in splitFileContents)
{
DataRow row = table.NewRow();
row.ItemArray = (object[])line;
table.Rows.Add(row);
}