FileStream.CanWrite 속성

정의

네임스페이스:
System.IO
어셈블리:
mscorlib.dll, System.IO.FileSystem.dll
어셈블리:
netstandard.dll, System.Runtime.dll
어셈블리:
System.IO.FileSystem.dll
어셈블리:
System.Runtime.dll
어셈블리:
mscorlib.dll
어셈블리:
netstandard.dll
Source:
FileStream.cs
Source:
FileStream.cs
Source:
FileStream.cs
Source:
FileStream.cs
Source:
FileStream.cs

현재 스트림이 쓰기를 지원하는지 여부를 나타내는 값을 가져옵니다.

public:
 virtual property bool CanWrite { bool get(); };
public override bool CanWrite { get; }
member this.CanWrite : bool
Public Overrides ReadOnly Property CanWrite As Boolean

속성 값

Boolean

true 스트림이 쓰기를 지원하는 경우 false 스트림이 닫혀 있거나 읽기 전용 액세스 권한으로 열려 있으면 입니다.

예제

다음 예제에서는 속성을 사용하여 스트림이 CanWrite 쓰기를 지원하는지 여부를 확인합니다.

using System;
using System.IO;
using System.Text;

class Test
{
    
    public static void Main()
    {
        string path = @"c:\temp\MyTest.txt";

        // Ensure that the file is readonly.
        File.SetAttributes(path, File.GetAttributes(path) | FileAttributes.ReadOnly);

        //Create the file.
        using (FileStream fs = new FileStream (path, FileMode.OpenOrCreate, FileAccess.Read))
        {
            if (fs.CanWrite)
            {
                Console.WriteLine("The stream for file {0} is writable.", path);
            }
            else
            {
                Console.WriteLine("The stream for file {0} is not writable.", path);
            }
        }
    }
}

open System.IO

let path = @"c:\temp\MyTest.txt"

// Ensure that the file is readonly.
File.SetAttributes(path, File.GetAttributes path ||| FileAttributes.ReadOnly)

//Create the file.
do
    use fs = new FileStream(path, FileMode.OpenOrCreate, FileAccess.Read)

    if fs.CanWrite then
        printfn $"The stream for file {path} is writable."

    else
        printfn $"The stream for file {path} is not writable."

Imports System.IO

Public Class Test

    Public Shared Sub Main()
        Dim path As String = "c:\temp\MyTest.txt"

        'Ensure that the file is readonly.
        File.SetAttributes(path, File.GetAttributes(path) Or FileAttributes.ReadOnly)

        'Create the file.
        Dim fs As FileStream = New FileStream(path, FileMode.OpenOrCreate, FileAccess.Read)

        If fs.CanWrite Then
            Console.WriteLine("The stream connected to {0} is writable.", path)
        Else
            Console.WriteLine("The stream connected to {0} is not writable.", path)
        End If
        fs.Close()
    End Sub
End Class

다음은 속성을 사용하는 예제입니다 CanWrite . 이 코드의 출력은 "MyFile.txt 쓰기 가능"입니다. "MyFile.txt 쓰고 읽을 수 있습니다."라는 출력 메시지를 얻으려면 매개 변수를 FileAccessReadWrite 생성자에서 FileStream 변경합니다.

using System;
using System.IO;

class TestRW
{
    public static void Main(String[] args)
    {
        FileStream fs = new FileStream("MyFile.txt", FileMode.OpenOrCreate, FileAccess.Write);
        if (fs.CanRead && fs.CanWrite)
        {
            Console.WriteLine("MyFile.txt can be both written to and read from.");
        }
        else if (fs.CanWrite)
        {
            Console.WriteLine("MyFile.txt is writable.");
        }
    }
}

open System.IO

let fs = new FileStream("MyFile.txt", FileMode.OpenOrCreate, FileAccess.Write)

if fs.CanRead && fs.CanWrite then
    printfn "MyFile.txt can be both written to and read from."
elif fs.CanWrite then
    printfn "MyFile.txt is writable."

Imports System.IO

Class TestRW
    Public Shared Sub Main()
        Dim fs As New FileStream("MyFile.txt", FileMode.OpenOrCreate, FileAccess.Write)

        If fs.CanRead And fs.CanWrite Then
            Console.WriteLine("MyFile.txt can be both written to and read from.")
        ElseIf fs.CanWrite Then
            Console.WriteLine("MyFile.txt is writable.")
        End If
    End Sub
End Class

설명

파생된 Stream 클래스가 쓰기, 호출, 또는 throw를 SetLengthWriteBeginWriteWriteByteNotSupportedException 지원하지 않는 경우 .

스트림이 닫혀 있으면 이 속성이 반환됩니다 false.

적용 대상

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