UnauthorizedAccessException UnauthorizedAccessException UnauthorizedAccessException UnauthorizedAccessException Class

定義

當作業系統因為 I/O 錯誤或特定類型的安全性錯誤而拒絕存取時,所擲回的例外狀況。The exception that is thrown when the operating system denies access because of an I/O error or a specific type of security error.

public ref class UnauthorizedAccessException : SystemException
[System.Runtime.InteropServices.ComVisible(true)]
[System.Serializable]
public class UnauthorizedAccessException : SystemException
type UnauthorizedAccessException = class
    inherit SystemException
Public Class UnauthorizedAccessException
Inherits SystemException
繼承
UnauthorizedAccessExceptionUnauthorizedAccessExceptionUnauthorizedAccessExceptionUnauthorizedAccessException
衍生
屬性

範例

下列範例說明UnauthorizedAccessException嘗試寫入唯讀檔案時,會擲回的例外狀況。The following example illustrates the UnauthorizedAccessException exception that is thrown when attempting to write to a read-only file.

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.
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.

備註

UnauthorizedAccessException通常會由包裝的 Windows API 呼叫的方法會擲回例外狀況。An UnauthorizedAccessException exception is typically thrown by a method that wraps a Windows API call. 若要尋找例外狀況的原因,請檢查例外狀況物件的文字Message屬性。To find the reasons for the exception, examine the text of the exception object's Message property.

UnauthorizedAccessException 會使用HRESULT COR_E_UNAUTHORIZEDACCESS,其中包含 0x80070005 的值。UnauthorizedAccessException uses the HRESULT COR_E_UNAUTHORIZEDACCESS, which has the value 0x80070005.

建構函式

UnauthorizedAccessException() UnauthorizedAccessException() UnauthorizedAccessException() UnauthorizedAccessException()

初始化 UnauthorizedAccessException 類別的新執行個體。Initializes a new instance of the UnauthorizedAccessException class.

UnauthorizedAccessException(SerializationInfo, StreamingContext) UnauthorizedAccessException(SerializationInfo, StreamingContext) UnauthorizedAccessException(SerializationInfo, StreamingContext) UnauthorizedAccessException(SerializationInfo, StreamingContext)

使用序列化資料,初始化 UnauthorizedAccessException 類別的新執行個體。Initializes a new instance of the UnauthorizedAccessException class with serialized data.

UnauthorizedAccessException(String) UnauthorizedAccessException(String) UnauthorizedAccessException(String) UnauthorizedAccessException(String)

使用指定的錯誤訊息,初始化 UnauthorizedAccessException 類別的新執行個體。Initializes a new instance of the UnauthorizedAccessException class with a specified error message.

UnauthorizedAccessException(String, Exception) UnauthorizedAccessException(String, Exception) UnauthorizedAccessException(String, Exception) UnauthorizedAccessException(String, Exception)

使用指定的錯誤訊息以及造成此例外狀況的內部例外狀況的參考,初始化 UnauthorizedAccessException 類別的新執行個體。Initializes a new instance of the UnauthorizedAccessException class with a specified error message and a reference to the inner exception that is the cause of this exception.

屬性

Data Data Data Data

取得提供例外狀況之其他使用者定義相關資訊的索引鍵/值組集合。Gets a collection of key/value pairs that provide additional user-defined information about the exception.

(Inherited from Exception)
HelpLink HelpLink HelpLink HelpLink

取得或設定與這個例外狀況相關聯的說明檔連結。Gets or sets a link to the help file associated with this exception.

(Inherited from Exception)
HResult HResult HResult HResult

取得或設定 HRESULT,它是指派給特定例外狀況的編碼數值。Gets or sets HRESULT, a coded numerical value that is assigned to a specific exception.

(Inherited from Exception)
InnerException InnerException InnerException InnerException

取得造成目前例外狀況的 Exception 執行個體。Gets the Exception instance that caused the current exception.

(Inherited from Exception)
Message Message Message Message

取得描述目前例外狀況的訊息。Gets a message that describes the current exception.

(Inherited from Exception)
Source Source Source Source

取得或設定造成錯誤的應用程式或物件的名稱。Gets or sets the name of the application or the object that causes the error.

(Inherited from Exception)
StackTrace StackTrace StackTrace StackTrace

取得呼叫堆疊上即時運算框架的字串表示。Gets a string representation of the immediate frames on the call stack.

(Inherited from Exception)
TargetSite TargetSite TargetSite TargetSite

取得擲回目前例外狀況的方法。Gets the method that throws the current exception.

(Inherited from Exception)

方法

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

判斷指定的物件是否等於目前的物件。Determines whether the specified object is equal to the current object.

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

在衍生類別中覆寫時,傳回一或多個後續的例外狀況的根本原因 ExceptionWhen 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()

做為預設雜湊函式。Serves as the default hash function.

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

在衍生類別中覆寫時,使用例外狀況的資訊設定 SerializationInfoWhen overridden in a derived class, sets the SerializationInfo with information about the exception.

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

取得目前執行個體的執行階段類型。Gets the runtime type of the current instance.

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

建立目前 Object 的淺層複本 (Shallow Copy)。Creates a shallow copy of the current Object.

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

建立並傳回目前例外狀況的字串表示。Creates and returns a string representation of the current exception.

(Inherited from Exception)

事件

SerializeObjectState SerializeObjectState SerializeObjectState SerializeObjectState

當例外狀況序列化,以建立包含例外狀況相關序列化資料的例外狀況狀態物件時,就會發生此事件。Occurs when an exception is serialized to create an exception state object that contains serialized data about the exception.

(Inherited from Exception)

適用於

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