Stream.CanRead 属性

定义

命名空间:
System.IO
程序集:
mscorlib.dll, System.IO.dll
程序集:
netstandard.dll, System.Runtime.dll
程序集:
System.IO.dll
程序集:
System.Runtime.dll
程序集:
mscorlib.dll
程序集:
netstandard.dll
Source:
Stream.cs
Source:
Stream.cs
Source:
Stream.cs
Source:
Stream.cs
Source:
Stream.cs

在派生类中重写时，获取一个值，该值指示当前流是否支持读取。

public:
 abstract property bool CanRead { bool get(); };
public abstract bool CanRead { get; }
member this.CanRead : bool
Public MustOverride ReadOnly Property CanRead As Boolean

属性值

Boolean

true 如果流支持读取，则为否则，为 false.

示例

下面是使用该 CanRead 属性的示例。

using System;
using System.IO;

class TestRW
{
    public static void Main(String[] args)
    {
        FileStream fs = new FileStream("MyFile.txt", FileMode.OpenOrCreate, FileAccess.Read);
        if (fs.CanRead && fs.CanWrite)
        {
            Console.WriteLine("MyFile.txt can be both written to and read from.");
        }
        else if (fs.CanRead)
        {
            Console.WriteLine("MyFile.txt is not writable.");
        }
    }
}

Imports System.IO

Class TestRW

    Public Shared Sub Main()
        Dim fs As New FileStream("MyFile.txt", FileMode.OpenOrCreate, FileAccess.Read)
        If fs.CanRead And fs.CanWrite Then
            Console.WriteLine("MyFile.txt can be both written to and read from.")
        Else
            If fs.CanRead Then
                Console.WriteLine("MyFile.txt is not writable.")
            End If
        End If
    End Sub
End Class

注解

如果派生自的类不支持读取，则对 <a0/> 的调用和方法将引发一个。

适用于

另请参阅