Lecture à Partir d'un Fichier Texte en C#

J'ai le programme suivant qui va envoyer (sortie) des informations dans un fichier texte, mais maintenant je veux lire (entrée) à partir du fichier texte. Toutes les suggestions sont grandement appréciés. J'ai commenté un couple de choses que "je pense" j'ai besoin de le faire; mais je ne suis pas vraiment certain de la façon de procéder.

using System.Windows.Forms;
using System.IO;
namespace Input_Output
{
public partial class Grades : Form
{
private StreamWriter output;
private StreamReader input;
public Grades()
{
InitializeComponent();
}
private void label4_Click(object sender, EventArgs e)
{
}
private void btnCreate_Click(object sender, EventArgs e)
{
btnEnter.Visible = true;
btnClose.Visible = true;
txtFirst.Visible = true;
txtLast.Visible = true;
lblFirst.Visible = true;
lblLast.Visible = true;
listBox1.Visible = true;
lblStatus.Visible = true;
lblGrade.Visible = true;
lblCourse.Visible = true;
cmbID.Visible = true;
lblID.Visible = true;
txtCourse.Visible = true;
txtGrade.Visible = true;
lblStatus.Visible = true;
DialogResult result;
string fileName;
using (SaveFileDialog chooser = new SaveFileDialog())
{
result = chooser.ShowDialog();
fileName = chooser.FileName;
}
output = new StreamWriter(fileName);
btnCreate.Enabled = false;
txtFirst.Visible = true;
txtLast.Visible = true;
lblFirst.Visible = true;
lblLast.Visible = true;
btnEnter.Visible = true;
btnClose.Visible = true;
}
private void btnClose_Click(object sender, EventArgs e)
{
//Close button pushes information from the listbox in to the text file
output.Close();
lblStatus.ForeColor = Color.Red;
lblStatus.Text = "Output File";
btnCreate.Enabled = true;
listBox1.Items.Clear();
cmbID.Text = "";
}
private void btnEnter_Click(object sender, EventArgs e)
{
//Enter button sends information to the list box, a Message Box prompts user to check for accuracy.  
//Close button pushes information to the Text file.
string last = "";
string first = "";
string course = "";
string grade = "";
if (txtFirst.Text != "" && txtLast.Text != "" && txtCourse.Text != "")
{
last = txtFirst.Text;
first = txtLast.Text;
course = txtCourse.Text;
grade = txtGrade.Text;
output.WriteLine (last + "\t"+ "\t" + first + ":"+ "\t" + cmbID.SelectedItem + "_" + course + "_" + grade );
listBox1.Items.Add(txtLast.Text + "," + txtFirst.Text + ":" + cmbID.SelectedItem + "-" + txtCourse.Text + "-" + txtGrade.Text);
lblStatus.ForeColor = Color.Navy;
lblStatus.Text = "Entry Saved";
txtFirst.Text = "";
txtLast.Text = "";
txtCourse.Text = "";
txtGrade.Text = "";
txtFirst.Focus();
}
else
{     
lblStatus.ForeColor = Color.Red;
lblStatus.Text = "Empty text box or boxes";
}
MessageBox.Show("Please verify that the information is correct before proceeding");
}
private void btnExit_Click(object sender, EventArgs e)
{
Application.Exit();
}
private void Grades_Load(object sender, EventArgs e)
{
}
private void button1_Click(object sender, EventArgs e)
{
DialogResult result;
string fileName;
using (OpenFileDialog chooser = new OpenFileDialog())
{
result = chooser.ShowDialog();
fileName = chooser.FileName;
}
//while loop?
//if variable is null, it's the end of the record
//variable= !null 
//txt read int variable TxtFile.Text += Rec + "\r\n";   while rec !=null;
}
}
}

InformationsquelleAutor Infiniti68 | 2011-11-02

c#c#-4.0

54

Pour lire un fichier texte ligne par ligne, vous pouvez le faire comme ceci:
```
using System.IO;
using (var reader = new StreamReader(fileName))
{
string line;
while ((line = reader.ReadLine()) != null)
{
//Do stuff with your line here, it will be called for each 
//line of text in your file.
}
}
```
Il y a d'autres façons. Par exemple, si le fichier n'est pas trop grande et on a juste envie de tout lire d'une seule chaîne de caractères, vous pouvez utiliser Fichier.ReadAllText()
```
myTextBox.Text = File.ReadAllText(fileName);
```
InformationsquelleAutor Isak Savo

C'est juste une ligne de code:

string content = System.IO.File.ReadAllText(@"C:\textfile.txt");

InformationsquelleAutor whihathac

Essayez ceci:

if(result == DialogResult.OK && fileName != null)
{
try
{
var fileText=File.ReadAllText(fileName);
}
catch(Exception ex)
{
//Handle exception here
}
}

Il lit les données à partir du fichier sélectionné dans la fileText variable.

InformationsquelleAutor flipchart

Utiliser la fonction Split() comme dans le code ci-dessous

CSS:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
namespace ConsoleApplication1
{
class Program
{
const string FILENAME = @"C:\temp\test.txt";
static void Main(string[] args)
{
StreamReader reader = new StreamReader(FILENAME);
string inputLine = "";
List<List<int>> data = new List<List<int>>();
while ((inputLine = reader.ReadLine()) != null)
{
string[] inputArray = inputLine.Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
if (inputArray.Count() > 0)
{
List<int> numbers = inputArray.Select(x => int.Parse(x)).ToList();
data.Add(numbers);
}
}
}
}
}

InformationsquelleAutor jdweng

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.IO;
namespace part_B_19
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
try
{
StreamReader sr = new StreamReader(@"C:\Users\Acer\Documents\Visual Studio 2012\Projects\combobox.txt");
string line = sr.ReadLine();
while (line != null)
{
comboBox1.Items.Add(line);
line = sr.ReadLine();
}
}
catch(Exception ex)
{
MessageBox.Show(ex.Message);
}
}
}
}

InformationsquelleAutor Sachith

Exemple illustrant e/s de FICHIER en C#

class Items
{
public int itemID { get; set; }
public string itemName { get; set; }
public int itemNo { get; set; }
public string pkgdate { get; set; }
}
class Program
{
private static string connectionString = "...";
static void Main(string[] args)
{
string streadpath = @"I:\itemdata.txt";
string stwritepath = @"I:\itemdata1.txt";
string stcopypath = @"I:\itemdata2.txt";
List<Items> li_all = new List<Items>();
List<Items> li_db = new List<Items>();
List<Items> li_valid = new List<Items>();
List<Items> li_invalid = new List<Items>();
li_all = stread_file(streadpath);
li_invalid = validate(li_all);
li_db = retrievefromDB();
bool x = stwrite_invalid(li_db, stwritepath);
bool y = stcopy_file(streadpath, stcopypath);
}
static List<Items> stread_file(string stpath)
{
List<Items> stli = new List<Items>();
using (StreamReader SR = new StreamReader(stpath))
{
string line = "";
while ((line = SR.ReadLine()) != null)
{
string[] linevalues = line.Split(',');
Items obj = new Items();
obj.itemID = int.Parse(linevalues[0]);
obj.itemName = linevalues[1];
obj.itemNo = int.Parse(linevalues[2]);
obj.pkgdate = linevalues[3];
stli.Add(obj);
}
}
return stli;
}
static List<Items> validate(List<Items> stli)
{
List<Items> li_valid = new List<Items>();
List<Items> li_invalid = new List<Items>();
DateTime parsed;
foreach (Items stit in stli)
{
if(DateTime.TryParseExact(stit.pkgdate, "MM/dd/yyyy",
CultureInfo.InvariantCulture,
DateTimeStyles.None, out parsed))
{
li_valid.Add(stit);
}
else
{
li_invalid.Add(stit);
}
}
InsertDataToDb(li_valid);
return li_invalid;
}
static bool stwrite_invalid(List<Items> stli,string stpath)
{
using (StreamWriter SW = new StreamWriter(stpath))
{
foreach(Items stit in stli)
{
SW.WriteLine(stit.itemID + "," + stit.itemName + "," + stit.itemNo + "," + stit.pkgdate);
}
}
return true;
}
static bool stcopy_file(string stsourcepath, string stdestinationpath)
{
File.Copy(stsourcepath, stdestinationpath);
return true;
}
static void InsertDataToDb(List<Items> stli)
{
var records = stli;
using (SqlConnection con = new SqlConnection(connectionString))
{
StringBuilder nonQuery = new StringBuilder();
foreach (var item in records)
{
nonQuery.AppendFormat("INSERT INTO dbo.Smartphone VALUES ({0}, '{1}', {2}, '{3}');",
item.itemID,
item.itemName,
item.itemNo,
item.pkgdate);
}
SqlCommand cmd = new SqlCommand(nonQuery.ToString(),con);
con.Open();
cmd.ExecuteNonQuery();
con.Close();
}
}
static List<Items> retrievefromDB()
{
List<Items> stli = new List<Items>();
DataTable dt = new DataTable();
SqlConnection con = new SqlConnection(connectionString);
con.Open();
SqlCommand cmd = new SqlCommand("select * from dbo.Smartphone", con);
SqlDataAdapter da = new SqlDataAdapter(cmd);
da.Fill(dt);
con.Close();
if (dt.Rows.Count > 0)
{
for (int i = 0; i < dt.Rows.Count; i++)
{
Items obj = new Items();
obj.itemID = (int)dt.Rows[i]["ID"];
obj.itemName = dt.Rows[i]["Name"].ToString();
obj.itemNo = (int)dt.Rows[i]["Num"];
obj.pkgdate = dt.Rows[i]["RDate"].ToString();
stli.Add(obj);
}
}
return stli;
}
}

InformationsquelleAutor xufufoja8

HTML:

namespace CDKatalog
{
public partial class KorisnickoUputstvo : System.Web.UI.Page
{
string[] izvodjac = new string[20];
string[] nazivAlbuma = new string[20];
string[] zanr = new string[20];
string[] godinaIzdavanja = new string[20];
string[] izdavackaKuca = new string[20];
string[] slikaOmota = new string[20];
protected void Page_Load(object sender, EventArgs e)
{
for (int i = 1990; i <= 2019; i++)
{
DropDownList2.Items.Add(i.ToString());
}
StreamReader sr = File.OpenText(Server.MapPath(@"\textFajl\katalog.txt"));
string sadrzaj = sr.ReadToEnd();
int brojac = 1;
int j = 0;
for (int i = 0; i < sadrzaj.Length; i++)
{
if (sadrzaj[i] == '^') { j++; brojac++; }
else if (sadrzaj[i] == '|')
{
brojac++;
}
else if (brojac % 6 == 1)
{
izvodjac[j] = izvodjac[j] + sadrzaj[i];
}
else if (brojac % 6 == 2)
{
nazivAlbuma[j] = nazivAlbuma[j] + sadrzaj[i];
}
else if (brojac % 6 == 3)
{
zanr[j] = zanr[j] + sadrzaj[i];
}
else if (brojac % 6 == 4)
{
godinaIzdavanja[j] = godinaIzdavanja[j] + sadrzaj[i];
}
else if (brojac % 6 == 5)
{
izdavackaKuca[j] = izdavackaKuca[j] + sadrzaj[i];
}
else if (brojac % 6 == 0)
{
slikaOmota[j] = slikaOmota[j] + sadrzaj[i];
}
}
}
protected void Button1_Click(object sender, EventArgs e)
{
DataTable dt = new DataTable();
dt.Clear();
dt.Columns.Add("Izvodjac", typeof(string));
dt.Columns.Add("Naziv Albuma", typeof(string));
dt.Columns.Add("Zanr", typeof(string));
dt.Columns.Add("Godina Izdavanja", typeof(string));
dt.Columns.Add("Izdavacka Kuca", typeof(string));
string pomoc = "";
for (int i = 1; i < 7; i++)//OVDE TREBA MENJATI BROJ
{
for (int c = 0; c < TextBox1.Text.Length; c++)
{
if (TextBox1.Text[c] == izvodjac[i][c + 2])
{
pomoc = pomoc + TextBox1.Text[c];
}
else {
pomoc = "";
break;
}
}
if (pomoc != "")
{
dt.Rows.Add(izvodjac[i], nazivAlbuma[i], zanr[i], godinaIzdavanja[i], izdavackaKuca[i]);
}
}
Label1.Text = nazivAlbuma[1][1].ToString();
GridView1.DataSource = dt;
GridView1.DataBind();          
}
protected void Button2_Click(object sender, EventArgs e)
{
DataTable dt = new DataTable();
dt.Clear();
dt.Columns.Add("Izvodjac", typeof(string));
dt.Columns.Add("Naziv Albuma", typeof(string));
dt.Columns.Add("Zanr", typeof(string));
dt.Columns.Add("Godina Izdavanja", typeof(string));
dt.Columns.Add("Izdavacka Kuca", typeof(string));
string pomoc = "";
for (int i = 1; i < 7; i++)
{
for (int c = 0; c < TextBox2.Text.Length; c++)
{
if (TextBox2.Text[c] == nazivAlbuma[i][c])
{
pomoc = pomoc + TextBox2.Text[c];
}
else
{
pomoc = "";
break;
}
}
if (pomoc != "")
dt.Rows.Add(izvodjac[i], nazivAlbuma[i], zanr[i], godinaIzdavanja[i], izdavackaKuca[i]);
}
GridView1.DataSource = dt;
GridView1.DataBind();      
}
protected void Button5_Click(object sender, EventArgs e)
{
DataTable dt = new DataTable();
dt.Clear();
dt.Columns.Add("Izvodjac", typeof(string));
dt.Columns.Add("Naziv Albuma", typeof(string));
dt.Columns.Add("Zanr", typeof(string));
dt.Columns.Add("GodinaIzdavanja", typeof(string));
dt.Columns.Add("Izdavacka Kuca", typeof(string));
string pomoc = "";
for (int i = 1; i < 7; i++)
{
for (int c = 0; c < TextBox3.Text.Length; c++)
{
if (TextBox3.Text[c] == izdavackaKuca[i][c])
{
pomoc = pomoc + TextBox3.Text[c];
}
else
{
pomoc = "";
break;
}
}
if (pomoc != "")
dt.Rows.Add(izvodjac[i], nazivAlbuma[i], zanr[i], godinaIzdavanja[i], izdavackaKuca[i]);
}
GridView1.DataSource = dt;
GridView1.DataBind(); 
}
protected void Button3_Click(object sender, EventArgs e)
{
DataTable dt = new DataTable();
dt.Clear();
dt.Columns.Add("Izvodjac", typeof(string));
dt.Columns.Add("Naziv Albuma", typeof(string));
dt.Columns.Add("Zanr", typeof(string));
dt.Columns.Add("Godina Izdavanja", typeof(string));
dt.Columns.Add("Izdavacka Kuca", typeof(string));
for (int i = 0; i < 7; i++)
{
if (DropDownList1.SelectedValue == zanr[i]) {
dt.Rows.Add(izvodjac[i], nazivAlbuma[i], zanr[i], godinaIzdavanja[i], izdavackaKuca[i]);
}
}
GridView1.DataSource = dt;
GridView1.DataBind(); 
}
protected void Button4_Click(object sender, EventArgs e)
{
DataTable dt = new DataTable();
dt.Clear();
dt.Columns.Add("Izvodjac", typeof(string));
dt.Columns.Add("NazivAlbuma", typeof(string));
dt.Columns.Add("Zanr", typeof(string));
dt.Columns.Add("Godina Izdavanja", typeof(string));
dt.Columns.Add("Izdavacka Kuca", typeof(string));
for (int i = 0; i < 7; i++)
{
if (DropDownList2.SelectedValue == godinaIzdavanja[i])
{
dt.Rows.Add(izvodjac[i], nazivAlbuma[i], zanr[i], godinaIzdavanja[i], izdavackaKuca[i]);
}
}
GridView1.DataSource = dt;
GridView1.DataBind(); 
}
}
}

InformationsquelleAutor Marko

-2

Vérifier ce code:

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim myStream As Stream = Nothing
Dim openFileDialog1 As New OpenFileDialog()
'openFileDialog1.InitialDirectory = "c:\"
openFileDialog1.Filter = "txt files (*.txt)|*.txt|All files (*.*)|*.*"
openFileDialog1.FilterIndex = 1
openFileDialog1.RestoreDirectory = True
If openFileDialog1.ShowDialog() = System.Windows.Forms.DialogResult.OK Then
Try
myStream = openFileDialog1.OpenFile()
If (myStream IsNot Nothing) Then
dataFile = openFileDialog1.FileName
Label1.Text = openFileDialog1.SafeFileName
Dim myReader As New StreamReader(dataFile)
Dim line As String
line = myReader.ReadLine()
While Not (line Is Nothing)
Dim str() As String = Split(line, ControlChars.Tab)
ListView1.Items.Add(New ListViewItem(str))
line = myReader.ReadLine()
End While
myReader.Close()
End If
Catch Ex As Exception
MessageBox.Show("Cannot read file from disk. Original error: " & Ex.Message)
Finally
' Check this again, since we need to make sure we didn't throw an exception on open.
If (myStream IsNot Nothing) Then
myStream.Close()
End If
End Try
End If
End Sub

InformationsquelleAutor Manu

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