InternalBufferOverflowException InternalBufferOverflowException InternalBufferOverflowException InternalBufferOverflowException Class

定义

内部缓冲区溢出时引发的异常。The exception thrown when the internal buffer overflows.

public ref class InternalBufferOverflowException : SystemException
[System.Serializable]
public class InternalBufferOverflowException : SystemException
type InternalBufferOverflowException = class
    inherit SystemException
Public Class InternalBufferOverflowException
Inherits SystemException
继承
InternalBufferOverflowExceptionInternalBufferOverflowExceptionInternalBufferOverflowExceptionInternalBufferOverflowException
属性

示例

下面的示例演示如何创建 FileSystemWatcher 来监视磁盘驱动器上发生的文件更改 (创建、删除、重命名、更改)。The following example shows how to create a FileSystemWatcher to monitor file changes (creates, deletes, renames, changes) occurring on a disk drive. 该示例还演示如何正确接收错误通知。The example also shows how to properly receive error notifications.

using System;
using System.IO;

class Program
{
    static void Main(string[] args)
    {
        //  Create a FileSystemWatcher to monitor all files on drive C.
        FileSystemWatcher fsw = new FileSystemWatcher("C:\\");

        //  Watch for changes in LastAccess and LastWrite times, and
        //  the renaming of files or directories. 
        fsw.NotifyFilter = NotifyFilters.LastAccess | NotifyFilters.LastWrite
            | NotifyFilters.FileName |NotifyFilters.DirectoryName;

        //  Register a handler that gets called when a 
        //  file is created, changed, or deleted.
        fsw.Changed += new FileSystemEventHandler(OnChanged);

        fsw.Created += new FileSystemEventHandler(OnChanged);

        fsw.Deleted += new FileSystemEventHandler(OnChanged);

        //  Register a handler that gets called when a file is renamed.
        fsw.Renamed += new RenamedEventHandler(OnRenamed);

        //  Register a handler that gets called if the 
        //  FileSystemWatcher needs to report an error.
        fsw.Error += new ErrorEventHandler(OnError);

        //  Begin watching.
        fsw.EnableRaisingEvents = true;

        Console.WriteLine("Press \'Enter\' to quit the sample.");
        Console.ReadLine();


    }

    //  This method is called when a file is created, changed, or deleted.
    private static void OnChanged(object source, FileSystemEventArgs e)
    {
        //  Show that a file has been created, changed, or deleted.
        WatcherChangeTypes wct = e.ChangeType;
        Console.WriteLine("File {0} {1}", e.FullPath, wct.ToString());
    }

    //  This method is called when a file is renamed.
    private static void OnRenamed(object source, RenamedEventArgs e)
    {
        //  Show that a file has been renamed.
        WatcherChangeTypes wct = e.ChangeType;
        Console.WriteLine("File {0} {2} to {1}", e.OldFullPath, e.FullPath, wct.ToString());
    }

    //  This method is called when the FileSystemWatcher detects an error.
    private static void OnError(object source, ErrorEventArgs e)
    {
        //  Show that an error has been detected.
        Console.WriteLine("The FileSystemWatcher has detected an error");
        //  Give more information if the error is due to an internal buffer overflow.
        if (e.GetException().GetType() == typeof(InternalBufferOverflowException))
        {
            //  This can happen if Windows is reporting many file system events quickly 
            //  and internal buffer of the  FileSystemWatcher is not large enough to handle this
            //  rate of events. The InternalBufferOverflowException error informs the application
            //  that some of the file system events are being lost.
            Console.WriteLine(("The file system watcher experienced an internal buffer overflow: " + e.GetException().Message));
        }
    }

}
Imports System.IO

Module Module1
    Sub Main()
        ' Create a FileSystemWatcher to monitor all files on drive C.
        Dim fsw As New FileSystemWatcher("C:\")

        ' Watch for changes in LastAccess and LastWrite times, and
        ' the renaming of files or directories. 
        fsw.NotifyFilter = (NotifyFilters.LastAccess Or NotifyFilters.LastWrite _ 
            Or NotifyFilters.FileName Or NotifyFilters.DirectoryName)

        ' Register a handler that gets called when a 
        ' file is created, changed, or deleted.
        AddHandler fsw.Changed, New FileSystemEventHandler(AddressOf OnChanged)

        ' The commented line of code below is a shorthand of the above line.
        ' AddHandler fsw.Changed, AddressOf OnChanged

        ' NOTE: The shorthand version is used in the remainder of this code.
        ' FileSystemEventHandler
        AddHandler fsw.Created, AddressOf OnChanged 
        ' FileSystemEventHandler
        AddHandler fsw.Deleted, AddressOf OnChanged

        ' Register a handler that gets called when a file is renamed.
        ' RenamedEventHandler
        AddHandler fsw.Renamed, AddressOf OnRenamed

        ' Register a handler that gets called if the 
        ' FileSystemWatcher needs to report an error.
        ' ErrorEventHandler
        AddHandler fsw.Error, AddressOf OnError

        ' Begin watching.
        fsw.EnableRaisingEvents = True

        ' Wait for the user to quit the program.
        Console.WriteLine("Press 'Enter' to quit the sample.")
        Console.ReadLine()
    End Sub

    ' This method is called when a file is created, changed, or deleted.
    Private Sub OnChanged(ByVal source As Object, ByVal e As FileSystemEventArgs)

        ' Show that a file has been created, changed, or deleted.
        Dim wct As WatcherChangeTypes = e.ChangeType
        Console.WriteLine("File {0} {1}", e.FullPath, wct.ToString())
    End Sub

    ' This method is called when a file is renamed.
    Private Sub OnRenamed(ByVal source As Object, ByVal e As RenamedEventArgs)

        ' Show that a file has been renamed.
        Dim wct As WatcherChangeTypes = e.ChangeType
        Console.WriteLine("File {0} {2} to {1}", e.OldFullPath, e.FullPath, wct.ToString())
    End Sub

    ' This method is called when the FileSystemWatcher detects an error.
    Private Sub OnError(ByVal source As Object, ByVal e As ErrorEventArgs)

        ' Show that an error has been detected.
        Console.WriteLine("The FileSystemWatcher has detected an error")

        ' Give more information if the error is due to an internal buffer overflow.
        If TypeOf e.GetException Is InternalBufferOverflowException Then
            ' This can happen if Windows is reporting many file system events quickly 
            ' and internal buffer of the  FileSystemWatcher is not large enough to handle this
            ' rate of events. The InternalBufferOverflowException error informs the application
            ' that some of the file system events are being lost.
            Console.WriteLine( _
                "The file system watcher experienced an internal buffer overflow: " _
                + e.GetException.Message)
        End If
    End Sub
End Module

注解

在中FileSystemWatcher, 当您收到文件更改通知时, 系统会将这些更改存储在组件创建并传递给应用程序编程接口 (api) 的缓冲区中。In a FileSystemWatcher, when you are notified of file changes, the system stores those changes in a buffer the component creates and passes to the Application Programming Interfaces (APIs). 如果在短时间内有很多更改, 则缓冲区可能会很容易溢出, 导致引发异常, 这实际上会丢失所有更改。If there are many changes in a short time, the buffer can easily overflow, resulting in an exception being thrown, which essentially loses all changes. 若要防止缓冲区溢出, 请使用FileSystemWatcher.NotifyFilterFileSystemWatcher.IncludeSubdirectories属性来筛选出不需要的更改通知。To keep the buffer from overflowing, use the FileSystemWatcher.NotifyFilter and FileSystemWatcher.IncludeSubdirectories properties to filter out your unwanted change notifications. 也可以通过 FileSystemWatcher.InternalBufferSize 属性增加内部缓冲区的大小。You can also increase the size of the internal buffer through the FileSystemWatcher.InternalBufferSize property. 不过, 增加缓冲区的大小会消耗大量资源, 因此应尽量减小缓冲区的大小。However, increasing the size of the buffer is expensive, so keep the buffer as small as possible.

构造函数

InternalBufferOverflowException() InternalBufferOverflowException() InternalBufferOverflowException() InternalBufferOverflowException()

初始化 InternalBufferOverflowException 类的新默认实例。Initializes a new default instance of the InternalBufferOverflowException class.

InternalBufferOverflowException(SerializationInfo, StreamingContext) InternalBufferOverflowException(SerializationInfo, StreamingContext) InternalBufferOverflowException(SerializationInfo, StreamingContext) InternalBufferOverflowException(SerializationInfo, StreamingContext)

初始化 InternalBufferOverflowException 类的新的空实例,该实例可序列化且使用指定的 SerializationInfoStreamingContextInitializes a new, empty instance of the InternalBufferOverflowException class that is serializable using the specified SerializationInfo and StreamingContext objects.

InternalBufferOverflowException(String) InternalBufferOverflowException(String) InternalBufferOverflowException(String) InternalBufferOverflowException(String)

通过指定要显示的错误信息来初始化 InternalBufferOverflowException 类的新实例。Initializes a new instance of the InternalBufferOverflowException class with the error message to be displayed specified.

InternalBufferOverflowException(String, Exception) InternalBufferOverflowException(String, Exception) InternalBufferOverflowException(String, Exception) InternalBufferOverflowException(String, Exception)

通过指定要显示的消息和生成的内部异常来初始化 InternalBufferOverflowException 类的新实例。Initializes a new instance of the InternalBufferOverflowException class with the message to be displayed and the generated inner exception specified.

属性

Data Data Data Data

获取提供有关异常的其他用户定义信息的键/值对集合。Gets a collection of key/value pairs that provide additional user-defined information about the exception.

(Inherited from Exception)
HelpLink HelpLink HelpLink HelpLink

获取或设置指向与此异常关联的帮助文件链接。Gets or sets a link to the help file associated with this exception.

(Inherited from Exception)
HResult HResult HResult HResult

获取或设置 HRESULT(一个分配给特定异常的编码数字值)。Gets or sets HRESULT, a coded numerical value that is assigned to a specific exception.

(Inherited from Exception)
InnerException InnerException InnerException InnerException

获取导致当前异常的 Exception 实例。Gets the Exception instance that caused the current exception.

(Inherited from Exception)
Message Message Message Message

获取描述当前异常的消息。Gets a message that describes the current exception.

(Inherited from Exception)
Source Source Source Source

获取或设置导致错误的应用程序或对象的名称。Gets or sets the name of the application or the object that causes the error.

(Inherited from Exception)
StackTrace StackTrace StackTrace StackTrace

获取调用堆栈上的即时框架字符串表示形式。Gets a string representation of the immediate frames on the call stack.

(Inherited from Exception)
TargetSite TargetSite TargetSite TargetSite

获取引发当前异常的方法。Gets the method that throws the current exception.

(Inherited from Exception)

方法

Equals(Object) Equals(Object) Equals(Object) Equals(Object)

确定指定的对象是否等于当前对象。Determines whether the specified object is equal to the current object.

(Inherited from Object)
GetBaseException() GetBaseException() GetBaseException() GetBaseException()

当在派生类中重写时,返回 Exception,它是一个或多个并发的异常的根源。When overridden in a derived class, returns the Exception that is the root cause of one or more subsequent exceptions.

(Inherited from Exception)
GetHashCode() GetHashCode() GetHashCode() GetHashCode()

作为默认哈希函数。Serves as the default hash function.

(Inherited from Object)
GetObjectData(SerializationInfo, StreamingContext) GetObjectData(SerializationInfo, StreamingContext) GetObjectData(SerializationInfo, StreamingContext) GetObjectData(SerializationInfo, StreamingContext)

当在派生类中重写时,用关于异常的信息设置 SerializationInfoWhen overridden in a derived class, sets the SerializationInfo with information about the exception.

(Inherited from Exception)
GetType() GetType() GetType() GetType()

获取当前实例的运行时类型。Gets the runtime type of the current instance.

(Inherited from Exception)
MemberwiseClone() MemberwiseClone() MemberwiseClone() MemberwiseClone()

创建当前 Object 的浅表副本。Creates a shallow copy of the current Object.

(Inherited from Object)
ToString() ToString() ToString() ToString()

创建并返回当前异常的字符串表示形式。Creates and returns a string representation of the current exception.

(Inherited from Exception)

事件

SerializeObjectState SerializeObjectState SerializeObjectState SerializeObjectState

当异常被序列化用来创建包含有关该异常的徐列出数据的异常状态对象时会出现该问题。Occurs when an exception is serialized to create an exception state object that contains serialized data about the exception.

(Inherited from Exception)

适用于

另请参阅