InternalBufferOverflowException Class

定義

内部バッファーがオーバーフローした場合にスローされる例外。 The exception thrown when the internal buffer overflows.

public class InternalBufferOverflowException : SystemException
継承
InternalBufferOverflowException

次の例は、ファイルの変更を監視するための filesystemwatcher クラスを作成する方法を示します (作成、削除、名前変更、変更) ディスク ドライブ上に伝送します。The following example shows how to create a FileSystemWatcher to monitor file changes (creates, deletes, renames, changes) occurring on a disk drive. また、正しくエラー通知を受信する方法も示します。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

注釈

FileSystemWatcherバッファーをコンポーネントでこれらの変更は、作成し、アプリケーション プログラミング インターフェイス (Api) を渡すシステム ストア ファイルの変更の通知が表示されます。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). 短時間で多くの変更がある場合、バッファーできます簡単にオーバーフロー、基本的にすべての変更が失われる例外がスローされ、その結果します。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. 使用して、バッファーのオーバーフローを防ぐため、FileSystemWatcher.NotifyFilterFileSystemWatcher.IncludeSubdirectories望ましくない変更通知を除外するプロパティ。To keep the buffer from overflowing, use the FileSystemWatcher.NotifyFilter and FileSystemWatcher.IncludeSubdirectories properties to filter out your unwanted change notifications. FileSystemWatcher.InternalBufferSize プロパティを使用して内部バッファーのサイズを増やすこともできます。You can also increase the size of the internal buffer through the FileSystemWatcher.InternalBufferSize property. ただし、高価なバッファーのサイズを増やすことが、ため、バッファーをできるだけ小さくしてください。However, increasing the size of the buffer is expensive, so keep the buffer as small as possible.

コンストラクター

InternalBufferOverflowException()

InternalBufferOverflowException クラスの新しい既定のインスタンスを初期化します。 Initializes a new default instance of the InternalBufferOverflowException class.

InternalBufferOverflowException(SerializationInfo, StreamingContext)

指定した InternalBufferOverflowException オブジェクトと SerializationInfo オブジェクトを使用してシリアル化できる、StreamingContext クラスの新しい空のインスタンスを初期化します。 Initializes a new, empty instance of the InternalBufferOverflowException class that is serializable using the specified SerializationInfo and StreamingContext objects.

InternalBufferOverflowException(String)

表示するエラー メッセージを指定して、InternalBufferOverflowException クラスの新しいインスタンスを初期化します。 Initializes a new instance of the InternalBufferOverflowException class with the error message to be displayed specified.

InternalBufferOverflowException(String, Exception)

表示するメッセージと生成される内部例外を指定して、InternalBufferOverflowException クラスの新しいインスタンスを初期化します。 Initializes a new instance of the InternalBufferOverflowException class with the message to be displayed and the generated inner exception specified.

プロパティ

Data

例外に関する追加のユーザー定義情報を提供する、キー/値ペアのコレクションを取得します。 Gets a collection of key/value pairs that provide additional user-defined information about the exception.

(Inherited from Exception)
HelpLink

この例外に関連付けられているヘルプ ファイルへのリンクを取得または設定します。 Gets or sets a link to the help file associated with this exception.

(Inherited from Exception)
HResult

特定の例外に割り当てられているコード化数値である HRESULT を取得または設定します。 Gets or sets HRESULT, a coded numerical value that is assigned to a specific exception.

(Inherited from Exception)
InnerException

現在の例外の原因となる Exception インスタンスを取得します。 Gets the Exception instance that caused the current exception.

(Inherited from Exception)
Message

現在の例外を説明するメッセージを取得します。 Gets a message that describes the current exception.

(Inherited from Exception)
Source

エラーの原因となるアプリケーションまたはオブジェクトの名前を取得または設定します。 Gets or sets the name of the application or the object that causes the error.

(Inherited from Exception)
StackTrace

呼び出し履歴で直前のフレームの文字列形式を取得します。 Gets a string representation of the immediate frames on the call stack.

(Inherited from Exception)
TargetSite

現在の例外がスローされたメソッドを取得します。 Gets the method that throws the current exception.

(Inherited from Exception)

方法

Equals(Object)

指定したオブジェクトが、現在のオブジェクトと等しいかどうかを判断します。 Determines whether the specified object is equal to the current object.

(Inherited from Object)
GetBaseException()

派生クラスでオーバーライドされた場合、それ以後に発生する 1 つ以上の例外の主要な原因である Exception を返します。 When overridden in a derived class, returns the Exception that is the root cause of one or more subsequent exceptions.

(Inherited from Exception)
GetHashCode()

既定のハッシュ関数として機能します。 Serves as the default hash function.

(Inherited from Object)
GetObjectData(SerializationInfo, StreamingContext)

派生クラスでオーバーライドされた場合は、その例外に関する情報を使用して SerializationInfo を設定します。 When overridden in a derived class, sets the SerializationInfo with information about the exception.

(Inherited from Exception)
GetType()

現在のインスタンスのランタイム型を取得します。 Gets the runtime type of the current instance.

(Inherited from Exception)
MemberwiseClone()

現在の Object の簡易コピーを作成します。 Creates a shallow copy of the current Object.

(Inherited from Object)
ToString()

現在の例外の文字列形式を作成して返します。 Creates and returns a string representation of the current exception.

(Inherited from Exception)

イベント

SerializeObjectState

例外がシリアル化され、例外に関するシリアル化されたデータを含む例外状態オブジェクトが作成されたときに発生します。 Occurs when an exception is serialized to create an exception state object that contains serialized data about the exception.

(Inherited from Exception)

適用対象

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