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vb.net写出文件代码 vbnet fileget
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如何用vb.net编写读取txt内容的代码?
窗体上添加2个文本框,设置成多行,2个按钮,在文本框1里随便输入若干文字,可以多行,单击按钮1,保存到文件。然后单击按钮2,把刚才写入的文件读到文本框2里。
代码如下:
'写文本文件
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
'创建(写入)一个文本文件
Dim MyStream As New System.IO.FileStream(Application.StartupPath "\Ssk.txt", System.IO.FileMode.Create)
Dim MyWriter As New System.IO.StreamWriter(MyStream, System.Text.Encoding.Default)
MyWriter.WriteLine(TextBox1.Text)
MyWriter.Flush()
MyWriter.Close()
MyStream.Close()
End Sub
'读文本文件
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
'读取一个文本文件
Dim MyReader As New System.IO.StreamReader(Application.StartupPath "\Ssk.txt", System.Text.Encoding.UTF8)
TextBox2.Text = MyReader.ReadToEnd()
MyReader.Close()
End Sub
气斜射入水或其他介质,折射光线与入射光线法线在
相关问答
Q1: VB.NET读写文本文件方法
工作需要 我需要使用对文本文件进行读写操作 编程需要完成如下工作
把程序执行错误追加到错误日志中
使巧巧读书网的编辑能够读取错误日志
记得以前使用vb 的时候 对文本文件的操作挺麻烦的 特别是在写文件的时候 需要区分什么顺序文件 随机文件 很教材都专门针对文本文件的读写开辟了一个章节来讲解 够麻烦的了 现在使用 net读写文本文件 因为时间仓促 没来得及细看MSDN 同时受到 的思路影响 把问题复杂化了 在追加记录到文本文件尾部的时候就写不下去了 后来仔细看了一下MSDN中例子 问题终于得到了解决
好了下面进入正题 分别把中对文本文件进行读和写的通用操作做个示例 免得后来新手多走弯路
我们这里是对文件流进行操作 所以模块前面要加上
Imports System IO
写操作
使用System IO的StreamWriter 下面是代码
Dim strFilePath As String = SaveFileDialog FileName
Dim sw As StreamWriter = New StreamWriter(strFilePath True) true是指以追加的方式打开指定文件
For i = To j
temp = i ToString
sw WriteLine(temp)
sw Flush()
Next
sw Close()
sw = Nothing
首先要说明的是构造函数new
Public Sub New(path append Encoding)
path 要打开文件的完整路径 如果文件不存在则自动建立一个新的文件
append 缺省值为false 指示是否以追加方式打开指定文件 false——如果存在path指定的文件 则覆盖原文件 否则建立一个新文件 true——如果存在path指定的文件 则打开该文件 以追加数据的方式在文尾写数据 否则建立一个新文件
Encoding 缺省值为System Text Encoding Default 即使用系统缺省的编码 指示以什么样的编码写文件
WriterLine(str) 在文本中添加一个新行 同时在行尾加上回车换行符
读操作
Dim line As String
Dim sr As StreamReader = New StreamReader(strPath System Text Encoding Default)
Do While sr Peek()
line = sr ReadLine()
Loop
sr Close()
sr = Nothing
构造函数new
Public Sub New(Path Encoding)
path 要打开文件的完整路径 如果文件抛出一个错误
Encoding 缺省值为System Text Encoding Default 即使用系统缺省的编码 指示以什么样的编码读文件
lishixinzhi/Article/program/net/201311/11973
Q2: 用VB.NET程序编写代码
Delphi代码如下:
procedure TForm1.Button1Click(Sender: TObject);
var
购物总价:Integer;
折扣:Extended;
begin
购物总价:=StrToInt(Edit1.Text);
if 购物总价250 then
begin
折扣:=0;
end
else if 购物总价500 then
begin
折扣:=0.05;
end
else if 购物总价1000 then
begin
折扣:=0.075;
end
else if 购物总价2000 then
begin
折扣:=0.1;
end
{
此段的折扣是多少?
else if 购物总价3000 then
begin
折扣:=0.05;
end
}
else if 购物总价=3000 then
begin
折扣:=0.15;
end;
ShowMessage('您享受的折扣是:'+FloatToStr(折扣)
+' 原价:'+IntToStr(购物总价)
+' 折后总价:'+FloatToStr(购物总价*(1-折扣)));
end;
Q3: 用vb.net编写记事本源代码
Dim sFileName As String
Dim Search
Private Sub dateTimeMenu_Click()
Text1.Text = Now
End Sub
Private Sub deleteMenu_Click()
Text1.Text = Left(Text1.Text, Text1.SelStart) + Mid(Text1.Text, Text1.SelStart + Text1.SelLength + 1)
End Sub
Private Sub findMenu_Click()
Search = InputBox("请输入要查找的字词:")
Dim Where1 '获取需要查找的字符串变量
Text1.SetFocus '文本框获得焦点,以显示所找到的内容Search = InputBox("请输入要查找的字词:")
Where1 = InStr(Text1.Text, Search) '在文本中查找字符串
If Where1 Then
'若找到则设置选定的起始位置并使找到的字符串高亮
Text1.SelStart = Where1 - 1
Text1.SelLength = Len(Search)
' Me.Caption = Where1 '测试用
'否则给出提示
Else: MsgBox "未找到所要查找的字符串。", vbInformation, "提示"
End If
End Sub
Private Sub findNextMenu_Click()
Dim Where2
Dim StartMe As Integer '查找的起始位置变量
Text1.SetFocus '文本框获得焦点
StartMe = Text1.SelLength + Text1.SelStart + 1 '给变量赋值
Where2 = InStr(StartMe, Text1.Text, Search) '令其从上次找到的地方找起
If Where2 Then
Text1.SelStart = Where2 - 1
Text1.SelLength = Len(Search)
Else: MsgBox "未找到所要查找的字符串.", vbInformation, "提示"
End If
End Sub
Private Sub aboutMenu_Click()
MsgBox Space(2) "文本编辑器版本号1.0" Chr(13) "由西南财经大学天府学院" Chr(13) Space(5) "肖忠 开发" Chr(13) Space(2) "copyright:天府学院"
End Sub
Private Sub allMenu_Click()
Text1.SelStart = 0
Text1.SelLength = Len(Text1.Text)
End Sub
Private Sub backcolorMenu_Click() '设置背景色代码
Form1.CommonDialog1.Action = 3
Text1.BackColor = Form1.CommonDialog1.Color
End Sub
Private Sub colorMenu_Click() '改变文字颜色代码
Form1.CommonDialog1.Action = 3
Text1.ForeColor = Form1.CommonDialog1.Color
End Sub
Private Sub cutMenu_Click()
Clipboard.SetText Text1.SelText
Text1.Text = Left(Text1.Text, Text1.SelStart) + Mid(Text1.Text, Text1.SelStart + Text1.SelLength + 1)
End Sub
Private Sub exitMenu_Click()
End
End Sub
Private Sub fontMenu_Click() '字体菜单代码
Form1.CommonDialog1.Flags = 3 Or 256
Form1.CommonDialog1.Action = 4
If Len(Form1.CommonDialog1.FontName) = 0 Then
Form1.Text1.FontName = "宋体"
Else
Form1.Text1.FontName = Form1.CommonDialog1.FontName
End If
Form1.Text1.FontSize = Form1.CommonDialog1.FontSize
If Form1.CommonDialog1.FontBold = True Then
Form1.Text1.FontBold = True
Else
Form1.Text1.FontBold = False
End If
If Form1.CommonDialog1.FontItalic = True Then
Form1.Text1.FontItalic = True
Else
Form1.Text1.FontItalic = False
End If
Text1.ForeColor = Form1.CommonDialog1.Color
End Sub
Private Sub Form_Load()
Form1.Text1.Width = Form1.Width - 130
Form1.Text1.Height = Form1.Height
End Sub
Private Sub Form_Resize()
Form1.Text1.Width = Form1.Width - 130
Form1.Text1.Height = Form1.Height
End Sub
Private Sub help1Menu_Click()
Form1.CommonDialog1.HelpCommand = cdlHelpForceFile
Form1.CommonDialog1.HelpFile = "c:\windows\system32\winhelp.hlp"
CommonDialog1.ShowHelp
End Sub
Private Sub newMenu_Click()
If Len(Trim(Text1.Text)) = 0 Then
Form1.Caption = "我的记事本" "--" "未命名"
sFileName = "未命名"
Text1.FontSize = 15
Text1.FontName = "宋体"
Text1.Text = ""
Else
Call saveAsMenu_Click
Form1.Caption = "我的记事本" "--" "未命名"
sFileName = "未命名"
Text1.FontSize = 15
Text1.FontName = "宋体"
Text1.Text = ""
End If
End Sub
Private Sub openMenu_Click() '打开文件代码
If Len(Trim(Text1.Text)) = 0 Then
Form1.Caption = "我的记事本"
Form1.CommonDialog1.Filter = "文本文件|*.txt"
Form1.CommonDialog1.Flags = 4096
Form1.CommonDialog1.Action = 1
If Len(Form1.CommonDialog1.FileName) 0 Then
sFileName = Form1.CommonDialog1.FileName
Form1.Caption = Form1.Caption "--" Form1.CommonDialog1.FileTitle
Open sFileName For Input As #1
Text1.FontSize = 15
Text1.FontName = "宋体"
Do While Not EOF(1)
Line Input #1, Text$
All$ = All$ + Text$ + Chr(13) + Chr(10)
Loop
Text1.Text = All
Close #1
End If
Else
Call saveAsMenu_Click
Form1.Caption = "我的记事本"
Form1.CommonDialog1.Filter = "文本文件|*.txt"
Form1.CommonDialog1.Flags = 4096
Form1.CommonDialog1.Action = 1
If Len(Form1.CommonDialog1.FileName) 0 Then
sFileName = Form1.CommonDialog1.FileName
Form1.Caption = Form1.Caption "--" Form1.CommonDialog1.FileTitle
Open sFileName For Input As #1
Text1.FontSize = 15
Text1.FontName = "宋体"
Do While Not EOF(1)
Line Input #1, Text$
All$ = All$ + Text$ + Chr(13) + Chr(10)
Loop
Text1.Text = All
Close #1
End If
End If
End Sub
Private Sub pasteMenu_Click() '粘贴菜单代码
Text1.Text = Left(Text1.Text, Text1.SelStart) + Clipboard.GetText() + Mid(Text1.Text, Text1.SelStart + Text1.SelLength + 1)
End Sub
Private Sub printMenu_Click()
Form1.CommonDialog1.ShowPrinter
For i = 1 To CommonDialog1.Copies
Printer.Print Text1.Text
Printer.Print Text1.Text
Next
Printer.EndDoc
End Sub
Private Sub saveAsMenu_Click() '另存为菜单代码
If Len(Trim(Text1.Text)) 0 Then
Form1.CommonDialog1.DialogTitle = "保存文件"
Form1.CommonDialog1.InitDir = "D:\"
Form1.CommonDialog1.Filter = "文本文件|*.txt"
Form1.CommonDialog1.Flags = 2
Form1.CommonDialog1.ShowSave
If Len(Form1.CommonDialog1.FileName) 0 Then
sFileName = Form1.CommonDialog1.FileName
Open sFileName For Output As #1
whole$ = Text1.Text
Print #1, whole
Close #1
End If
End If
End Sub
Private Sub saveMenu_Click()
If Len(Trim(Text1.Text)) 0 Then
Form1.CommonDialog1.DialogTitle = "保存文件"
Form1.CommonDialog1.InitDir = "D:\"
Form1.CommonDialog1.FileName = "新建文本"
Form1.CommonDialog1.Filter = "文本文件|*.txt"
Form1.CommonDialog1.Flags = 2
Form1.CommonDialog1.ShowSave
If Len(Form1.CommonDialog1.FileName) 0 Then
sFileName = Form1.CommonDialog1.FileName
Open sFileName For Output As #1
whole$ = Text1.Text
Print #1, whole
Close #1
End If
End If
End Sub
Private Sub statusMenu_Click()
End Sub
Q4: 用VB.NET编写以下程序。
using System;
using System.Windows.Forms;
namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
Timer tm = new Timer();//实例化 timeer
static int timeS = 0; //设置静态变量记录秒数
TimeSpan ts = new TimeSpan(); //实例化 TimeSpan
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
tm.Interval = 1000; //设置 timeer 1000毫秒执行一次
tm.Tick += new EventHandler(timeer_Tick); //设置 timeer 运行事件
tm.Start(); // 启用 timeer
}
private void timeer_Tick(object sender, EventArgs e)
{
timeS += 1; //秒数 +1
ts = new TimeSpan(0, 0, timeS);
label1.Text = ts.Hours + ":" + ts.Minutes + ":" + ts.Seconds;
}
private void button2_Click(object sender, EventArgs e)
{
tm.Stop();
timeS = 0;
}
}
}
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