UnauthorizedAccessException Sınıf

Tanım

public ref class UnauthorizedAccessException : Exception

public ref class UnauthorizedAccessException : SystemException

public class UnauthorizedAccessException : Exception

public class UnauthorizedAccessException : SystemException

[System.Serializable]
public class UnauthorizedAccessException : SystemException

[System.Serializable]
[System.Runtime.InteropServices.ComVisible(true)]
public class UnauthorizedAccessException : SystemException

type UnauthorizedAccessException = class
    inherit Exception

type UnauthorizedAccessException = class
    inherit SystemException

[<System.Serializable>]
type UnauthorizedAccessException = class
    inherit SystemException

[<System.Serializable>]
[<System.Runtime.InteropServices.ComVisible(true)>]
type UnauthorizedAccessException = class
    inherit SystemException

Public Class UnauthorizedAccessException
Inherits Exception

Public Class UnauthorizedAccessException
Inherits SystemException

Devralma

Object

Exception

UnauthorizedAccessException

Devralma

Object

Exception

SystemException

UnauthorizedAccessException

Türetilmiş

System.Security.AccessControl.PrivilegeNotHeldException

Öznitelikler

SerializableAttribute ComVisibleAttribute

Örnekler

Aşağıdaki örnekte, salt okunur bir dosyaya yazmaya çalışırken oluşan UnauthorizedAccessException özel durumu gösterilmektedir.

using System;
using System.IO;

public class Example
{
   public static void Main()
   {
      string filePath = @".\ROFile.txt";
      if (! File.Exists(filePath))
         File.Create(filePath);
      // Keep existing attributes, and set ReadOnly attribute.
      File.SetAttributes(filePath, 
                        (new FileInfo(filePath)).Attributes | FileAttributes.ReadOnly);

      StreamWriter sw = null;
      try {
         sw = new StreamWriter(filePath);
         sw.Write("Test");
      }
      catch (UnauthorizedAccessException) {
         FileAttributes attr = (new FileInfo(filePath)).Attributes;
         Console.Write("UnAuthorizedAccessException: Unable to access file. ");
         if ((attr & FileAttributes.ReadOnly) > 0)
            Console.Write("The file is read-only."); 
       }
       finally {
         if (sw != null) sw.Close();
      }   
   }
}
// The example displays the following output:
//    UnAuthorizedAccessException: Unable to access file. The file is read-only.

open System
open System.IO


let filePath = @".\ROFile.txt"
if File.Exists filePath |> not then
    File.Create filePath |> ignore
// Keep existing attributes, and set ReadOnly attribute.
File.SetAttributes(filePath, (FileInfo filePath).Attributes ||| FileAttributes.ReadOnly)

do
    use sw = new StreamWriter(filePath)
    try
        sw.Write "Test"
    with :? UnauthorizedAccessException ->
        let attr = (FileInfo filePath).Attributes
        printf "UnAuthorizedAccessException: Unable to access file. "
        if int (attr &&& FileAttributes.ReadOnly) > 0 then
            printf "The file is read-only."
// The example displays the following output:
//    UnAuthorizedAccessException: Unable to access file. The file is read-only.

Imports System.IO

Module Example
   Public Sub Main()
      Dim filePath As String = ".\ROFile.txt"
      If Not File.Exists(filePath) Then File.Create(filePath)
      ' Keep existing attributes, and set ReadOnly attribute.
      File.SetAttributes(filePath, 
                        (New FileInfo(filePath)).Attributes Or FileAttributes.ReadOnly)

      Dim sw As StreamWriter = Nothing
      Try
         sw = New StreamWriter(filePath)
         sw.Write("Test")
      Catch e As UnauthorizedAccessException
         Dim attr As FileAttributes = (New FileInfo(filePath)).Attributes
         Console.Write("UnAuthorizedAccessException: Unable to access file. ")
         If (attr And FileAttributes.ReadOnly) > 0 Then
            Console.Write("The file is read-only.") 
         End If
       Finally
         If sw IsNot Nothing Then sw.Close()
      End Try   
   End Sub
End Module
' The example displays the following output:
'   UnAuthorizedAccessException: Unable to access file. The file is read-only.

Açıklamalar

UnauthorizedAccessException özel durumu genellikle bir Windows API çağrısını sarmalayan bir yöntem tarafından oluşturulur. Özel durumun nedenlerini bulmak için özel durum nesnesinin Message özelliğinin metnini inceleyin.

UnauthorizedAccessException değeri 0x80070005 olan HRESULTCOR_E_UNAUTHORIZEDACCESSkullanır.

Oluşturucular

Özellikler

Yöntemler

Ekinlikler

Şunlara uygulanır

Ayrıca bkz.

• Exception
• İşleme ve Oluşturma Özel Durumları