本文整理汇总了VB.NET中System.IO.File.Open方法的典型用法代码示例。如果您正苦于以下问题：VB.NET File.Open方法的具体用法？VB.NET File.Open怎么用？VB.NET File.Open使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类System.IO.File的用法示例。
在下文中一共展示了File.Open方法的3个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的VB.NET代码示例。
示例1: Test
' 导入命名空间
Imports System.IO
Imports System.Text
Public Class Test
Public Shared Sub Main()
' Create a temporary file, and put some data into it.
Dim path1 As String = Path.GetTempFileName()
Using fs As FileStream = File.Open(path1, FileMode.Open, FileAccess.Write, FileShare.None)
Dim info As Byte() = New UTF8Encoding(True).GetBytes("This is some text in the file.")
' Add some information to the file.
fs.Write(info, 0, info.Length)
End Using
' Open the stream and read it back.
Using fs As FileStream = File.Open(path1, FileMode.Open)
Dim b(1023) As Byte
Dim temp As UTF8Encoding = New UTF8Encoding(True)
Do While fs.Read(b, 0, b.Length) > 0
Console.WriteLine(temp.GetString(b))
Loop
End Using
End Sub
End Class示例2: Test
' 导入命名空间
Imports System.IO
Imports System.Text
Public Class Test
Public Shared Sub Main()
' This sample assumes that you have a folder named "c:\temp" on your computer.
Dim filePath As String = "c:\temp\MyTest.txt"
' Delete the file if it exists.
If File.Exists(filePath) Then
File.Delete(filePath)
End If
' Create the file.
Using fs As FileStream = File.Create(filePath)
Dim info As Byte() = New UTF8Encoding(True).GetBytes("This is some text in the file.")
' Add some information to the file.
fs.Write(info, 0, info.Length)
End Using
' Open the stream and read it back.
Using fs As FileStream = File.Open(filePath, FileMode.Open, FileAccess.Read)
Dim b(1023) As Byte
Dim temp As UTF8Encoding = New UTF8Encoding(True)
' Display the information on the console.
Do While fs.Read(b, 0, b.Length) > 0
Console.WriteLine(temp.GetString(b))
Loop
Try
' Try to write to the file
fs.Write(b, 0, b.Length)
Catch e As Exception
Console.WriteLine("Writing was disallowed, as expected: " & e.ToString())
End Try
End Using
End Sub
End Class示例3: Test
' 导入命名空间
Imports System.IO
Imports System.Text
Public Class Test
Public Shared Sub Main()
Dim path As String = "c:\temp\MyTest.txt"
' Create the file if it does not exist.
If Not File.Exists(path) Then
' Create the file.
Using fs As FileStream = File.Create(path)
Dim info As Byte() = New UTF8Encoding(True).GetBytes("This is some text in the file.")
' Add some information to the file.
fs.Write(info, 0, info.Length)
End Using
End If
' Open the stream and read it back.
Using fs As FileStream = File.Open(path, FileMode.Open, FileAccess.Read, FileShare.None)
Dim b(1023) As Byte
Dim temp As UTF8Encoding = New UTF8Encoding(True)
Do While fs.Read(b, 0, b.Length) > 0
Console.WriteLine(temp.GetString(b))
Loop
Try
' Try to get another handle to the same file.
Using fs2 As FileStream = File.Open(path, FileMode.Open)
' Do some task here.
End Using
Catch e As Exception
Console.Write("Opening the file twice is disallowed.")
Console.WriteLine(", as expected: {0}", e.ToString())
End Try
End Using
End Sub
End Class