System.IO.FileLoadException Class

Summary

The exception that is thrown when a file is found but cannot be loaded.

C# Syntax:

[Serializable] public class FileLoadException : IOException

Represents the error that occurs when a Assembly file is found but cannot be loaded.

The FileNotFoundException exception is thrown when the file fails to load because it cannot be located. If the file is located, but cannot be loaded due to insufficient permissions, a SecurityException is thrown.

FileLoadException uses the HRESULT COR_E_FILELOAD, which has the value 0x80131621. This exception can also be thrown from HRESULT 0x80131018.

System.IO Namespace | Exception | MSDN: handlingthrowingexceptions

System.IO.FileLoadException Member List:

Public Constructors

ctor #1	Overloaded: .ctor() Default constructor. This constructor is called by derived class constructors to initialize state in this type. Initializes a new instance of the FileLoadException class, setting the Exception.Message property of the new instance to a system-supplied message that describes the error, such as "Could not load the specified file." This message takes into account the current system culture.
ctor #2	Overloaded: .ctor(string message) Initializes a new instance of the FileLoadException class with the specified error message.
ctor #4	Overloaded: .ctor(string message, Exception inner) Initializes a new instance of the FileLoadException class with a specified error message and a reference to the inner exception that is the cause of this exception.
ctor #5	Overloaded: .ctor(string message, string fileName) Initializes a new instance of the FileLoadException class with a specified error message and the name of the file that could not be loaded.
ctor #6	Overloaded: .ctor(string message, string fileName, Exception inner) Initializes a new instance of the FileLoadException class with a specified error message, the name of the file that could not be loaded, and a reference to the inner exception that is the cause of this exception.

Public Properties

FileName	Read-only Gets the name of the file that causes this exception.
FusionLog	Read-only Gets the log file that describes why an assembly load failed.
HelpLink (inherited from System.Exception)	Read-write See base class member description: System.Exception.HelpLink Gets or sets a link to the help file associated with this exception.
InnerException (inherited from System.Exception)	Read-only See base class member description: System.Exception.InnerException Gets the Exception instance that caused the current exception.
Message	Read-only Overridden: Gets the error message and the name of the file that caused this exception.
Source (inherited from System.Exception)	Read-write See base class member description: System.Exception.Source Gets or sets the name of the application or the object that causes the error.
StackTrace (inherited from System.Exception)	Read-only See base class member description: System.Exception.StackTrace Gets a string representation of the frames on the call stack at the time the current exception was thrown.
TargetSite (inherited from System.Exception)	Read-only See base class member description: System.Exception.TargetSite Gets the method that throws the current exception.

Public Methods

Equals (inherited from System.Object)	See base class member description: System.Object.Equals Derived from System.Object, the primary base class for all objects.
GetBaseException (inherited from System.Exception)	See base class member description: System.Exception.GetBaseException When overridden in a derived class, returns the Exception that is the root cause of one or more subsequent exceptions.
GetHashCode (inherited from System.Object)	See base class member description: System.Object.GetHashCode Derived from System.Object, the primary base class for all objects.
GetObjectData	Overridden: Sets the SerializationInfo with the file name and additional exception information.
GetType (inherited from System.Object)	See base class member description: System.Object.GetType Derived from System.Object, the primary base class for all objects.
ToString	Overridden: Returns the fully qualified name of the current exception, and possibly the error message, the name of the inner exception, and the stack trace.

Protected Constructors

ctor #3

Overloaded: .ctor(SerializationInfo info, StreamingContext context) Initializes a new instance of the FileLoadException class with serialized data.

Protected Properties

HResult (inherited from System.Exception)

Read-write See base class member description: System.Exception.HResult Gets or sets HRESULT, a coded numerical value that is assigned to a specific exception.

Protected Methods

Finalize (inherited from System.Object)	See base class member description: System.Object.Finalize Derived from System.Object, the primary base class for all objects.
MemberwiseClone (inherited from System.Object)	See base class member description: System.Object.MemberwiseClone Derived from System.Object, the primary base class for all objects.

Hierarchy:

• System.Object
• System.Exception
• System.SystemException
• System.IO.IOException
• System.IO.FileLoadException

System.IO.FileLoadException Member Details

Summary

Initializes a new instance of the FileLoadException class, setting the Exception.Message property of the new instance to a system-supplied message that describes the error, such as "Could not load the specified file." This message takes into account the current system culture.

Default constructor. This constructor is called by derived class constructors to initialize state in this type.

C# Syntax:

public FileLoadException();

The Exception.InnerException property and FileLoadException.FileName property of the new instance are initialized to null.

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Summary

Initializes a new instance of the FileLoadException class with the specified error message.

C# Syntax:

public FileLoadException(    string message );

message

A String that describes the error. The content of message is intended to be understood by humans. The caller of this constructor is required to ensure that this string has been localized for the current system culture.

This constructor initializes the FileLoadException.Message property of the new instance using message. The Exception.InnerException property and FileLoadException.FileName property of the new instance are initialized to null.

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Summary

Initializes a new instance of the FileLoadException class with serialized data.

C# Syntax:

protected FileLoadException(    SerializationInfo info,    StreamingContext context );

info

The SerializationInfo that holds the serialized object data about the exception being thrown.

context

The StreamingContext that contains contextual information about the source or destination.

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Summary

Initializes a new instance of the FileLoadException class with a specified error message and a reference to the inner exception that is the cause of this exception.

C# Syntax:

public FileLoadException(    string message,    Exception inner );

message

A String that describes the error. The content of message is intended to be understood by humans. The caller of this constructor is required to ensure that this string has been localized for the current system culture.

inner

The exception that is the cause of the current exception. If the inner parameter is not null, the current exception is raised in a catch block that handles the inner exception.

An exception that is thrown as a direct result of a previous exception should include a reference to the previous exception in the Exception.InnerException property. The InnerException property returns the same value that is passed into the constructor, or null if the InnerException property does not supply the inner exception value to the constructor.

The following table shows the initial property values for an instance of FileLoadException.

Property	Value
Exception.InnerException	The inner exception reference.
FileLoadException.Message	The error message string.

For more information on inner exceptions, see Exception.InnerException.

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Summary

Initializes a new instance of the FileLoadException class with a specified error message and the name of the file that could not be loaded.

C# Syntax:

public FileLoadException(    string message,    string fileName );

message

A String that describes the error. The content of message is intended to be understood by humans. The caller of this constructor is required to ensure that this string has been localized for the current system culture.

fileName

A String containing the name of the file that was not loaded.

This constructor initializes the FileLoadException.Message property of the new instance using message and the FileLoadException.FileName property using fileName. The Exception.InnerException property of the new instance is initialized to null.

FileLoadException.FileName is not required to be a file stored on disk; it can be any part of a system that supports access to streams. For example, depending on the system, this class might be able to access a physical device.

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Summary

Initializes a new instance of the FileLoadException class with a specified error message, the name of the file that could not be loaded, and a reference to the inner exception that is the cause of this exception.

C# Syntax:

public FileLoadException(    string message,    string fileName,    Exception inner );

message

A String that describes the error. The content of message is intended to be understood by humans. The caller of this constructor is required to ensure that this string has been localized for the current system culture.

fileName

A String containing the name of the file that was not loaded.

inner

The exception that is the cause of the current exception. If the inner parameter is not null, the current exception is raised in a catch block that handles the inner exception.

An exception that is thrown as a direct result of a previous exception should include a reference to the previous exception in the Exception.InnerException property. The InnerException property returns the same value that is passed into the constructor, or null if the InnerException property does not supply the inner exception value to the constructor.

FileLoadException.FileName is not required to be a file stored on disk; it can be any part of a system that supports access to streams. For example, depending on the system, this class might be able to access a physical device.

The following table shows the initial property values for an instance of FileLoadException.

Property	Value
Exception.InnerException	The inner exception reference.
FileLoadException.Message	The error message string.

For more information on inner exceptions, see Exception.InnerException.

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Summary

Gets the name of the file that causes this exception.

C# Syntax:

public string FileName {get;}

This property returns the name of the file supplied to the constructor for the current instance, if any. If the file name was not specified or is a null reference, this property returns a null reference.

This property is read-only.

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Summary

Gets the log file that describes why an assembly load failed.

C# Syntax:

public string FusionLog {get;}

Exceptions

Exception Type	Condition
SecurityException	The caller does not have the required permission.

SecurityPermission to provide evidence and view and modify policy. Associated enumerations: SecurityPermissionFlag.ControlEvidence, SecurityPermissionFlag.ControlPolicy.

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Inherited
See base class member description: System.Exception.HelpLink

Summary

Gets or sets a link to the help file associated with this exception.

C# Syntax:

public virtual string HelpLink {get; set;}

The return value, which represents a help file, is a URN or URL. For example, the HelpLink value could be:

"file:///C:/Applications/Bazzal/help.html#ErrorNum42"

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Inherited
See base class member description: System.Exception.HResult

Summary

Gets or sets HRESULT, a coded numerical value that is assigned to a specific exception.

C# Syntax:

protected int HResult {get; set;}

HRESULT is a 32-bit value, divided into three different fields: a severity code, a facility code, and an error code. The severity code indicates whether the return value represents information, warning, or error. The facility code identifies the area of the system responsible for the error. The error code is a unique number that is assigned to represent the exception. Each exception is mapped to a distinct HRESULT. When managed code throws an exception, the runtime passes the HRESULT to the COM client. When unmanaged code returns an error, the HRESULT is converted to an exception, which is then thrown by the runtime.

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Inherited
See base class member description: System.Exception.InnerException

Summary

Gets the Exception instance that caused the current exception.

C# Syntax:

public Exception InnerException {get;}

When an exception X is thrown as a direct result of a previous exception Y, the InnerException property of X should contain a reference to Y.

Use the InnerException property to obtain the set of exceptions that led to the current exception.

You can create a new exception that catches an earlier exception. The code that handles the second exception can make use of the additional information from the earlier exception to handle the error more appropriately.

Suppose that there is a function that reads a file and formats the data from that file. In this example, as the code tries to read the file, an IOException is thrown. The function catches the IOException and throws a FileNotFoundException. The IOException could be saved in the Exception.InnerException property of the FileNotFoundException, enabling the code that catches the FileNotFoundException to examine what causes the initial error.

The Exception.InnerException property, which holds a reference to the inner exception, is set upon initialization of the exception object.

The following example demonstrates throwing and catching an exception that references an inner exception.

using System;
public class MyAppException:ApplicationException 
{
   public MyAppException (String message) : base (message) 
   {}
   public MyAppException (String message, Exception inner) : base(message,inner) {}	
   }
public class ExceptExample 
{
   public void ThrowInner () 
   {
   throw new MyAppException("ExceptExample inner exception");
   }
   public void CatchInner() 
   {
      try 
      {
      this.ThrowInner();
      }
         catch (Exception e) 
         {
         throw new MyAppException("Error caused by trying ThrowInner.",e);
         }
      }
   }
public class Test 
{
   public static void Main() 
   {
   ExceptExample testInstance = new ExceptExample();
      try 
      {
      testInstance.CatchInner();
      }
         catch(Exception e) 
         {
         Console.WriteLine ("In Main catch block. Caught: {0}", e.Message);
         Console.WriteLine ("Inner Exception is {0}",e.InnerException);
         }
      }
}

    

This code has the following output:

In Main catch block. Caught: Error caused by trying ThrowInner. Inner Exception is MyAppException: ExceptExample inner exception at ExceptExample.ThrowInner() at ExceptExample.CatchInner()

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Summary

Gets the error message and the name of the file that caused this exception.

C# Syntax:

public override string Message {get;}

This property overrides Exception.Message.

If no message was supplied to the constructor for the current exception, this property returns a system-supplied error message. If the FileLoadException.FileName property is not a null reference, the message includes the file name, for example, "Unable to load file a FileName." (a FileName represents the value returned by FileLoadException.FileName.) If FileLoadException.FileName is null, this is indicated in the system-supplied message as "(null)". The system-supplied message takes into account the current system culture.

This property is read-only.

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Inherited
See base class member description: System.Exception.Source

Summary

Gets or sets the name of the application or the object that causes the error.

C# Syntax:

public virtual string Source {get; set;}

If Exception.Source is not set, the name of the assembly where the exception originated is returned.

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Inherited
See base class member description: System.Exception.StackTrace

Summary

Gets a string representation of the frames on the call stack at the time the current exception was thrown.

C# Syntax:

public virtual string StackTrace {get;}

The execution stack keeps track of all the methods that are in execution at a given instant. A trace of the method calls is called a stack trace. The stack trace listing provides a means to follow the call sequence to the line number in the method where the exception occurs.

StackTrace may not report as many method calls as expected, due to code transformations, such as inlining, that occur during optimization.

Notes to inheritors: The StackTrace property is overridden in classes that require control over the stack trace content or format.

By default, the stack trace is captured immediately before an exception object is thrown. Use Environment.StackTrace to get stack trace information when no exception is being thrown.

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Inherited
See base class member description: System.Exception.TargetSite

Summary

Gets the method that throws the current exception.

C# Syntax:

public MethodBase TargetSite {get;}

If the method that throws this exception is not available and the stack trace is not a null reference (not set or empty), Exception.TargetSite obtains the method from the stack trace. If the stack trace is a null reference , Exception.TargetSite also returns a null reference.

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Inherited
See base class member description: System.Object.Equals

C# Syntax:

public virtual bool Equals(    object obj );

For more information on members inherited from System.Object click on the link above.

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Inherited
See base class member description: System.Object.Finalize

C# Syntax:

~FileLoadException();

For more information on members inherited from System.Object click on the link above.

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Inherited
See base class member description: System.Exception.GetBaseException

Summary

When overridden in a derived class, returns the Exception that is the root cause of one or more subsequent exceptions.

C# Syntax:

public virtual Exception GetBaseException();

Return Value:

The first exception thrown in a chain of exceptions. If the Exception.InnerException property of the current exception is a null reference (not set or empty), this property returns the current exception.

A chain of exceptions consists of a set of exceptions such that each exception in the chain was thrown as a direct result of the exception referenced in its InnerException property. For a given chain, there can be exactly one exception that is the root cause of all other exceptions in the chain. This exception is called the base exception and its InnerException property always contains a null reference.

For all exceptions in a chain of exceptions, the GetBaseException method must return the same object (the base exception).

Use the GetBaseException method when you want to find the root cause of an exception but do not need information about exceptions that may have occurred between the current exception and the first exception.

Notes to inheritors: The GetBaseException method is overridden in classes that require control over the exception content or format.

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Inherited
See base class member description: System.Object.GetHashCode

C# Syntax:

public virtual int GetHashCode();

For more information on members inherited from System.Object click on the link above.

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Summary

Sets the SerializationInfo with the file name and additional exception information.

C# Syntax:

public override void GetObjectData(    SerializationInfo info,    StreamingContext context );

info

The SerializationInfo that holds the serialized object data about the exception being thrown.

context

The StreamingContext that contains contextual information about the source or destination.

Exceptions

Exception Type	Condition
SecurityException	The caller does not have the required permission.

Implements:

ISerializable.GetObjectData

SecurityPermission to provide evidence and view and modify policy. Associated enumerations: SecurityPermissionFlag.ControlEvidence, SecurityPermissionFlag.ControlPolicy.

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Inherited
See base class member description: System.Object.GetType

C# Syntax:

public Type GetType();

For more information on members inherited from System.Object click on the link above.

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Inherited
See base class member description: System.Object.MemberwiseClone

C# Syntax:

protected object MemberwiseClone();

For more information on members inherited from System.Object click on the link above.

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Summary

Returns the fully qualified name of the current exception, and possibly the error message, the name of the inner exception, and the stack trace.

C# Syntax:

public override string ToString();

Return Value:

A string containing the fully qualified name of this exception, and possibly the error message, the name of the inner exception, and the stack trace, depending on which FileLoadException constructor is used.

This method overrides Object.ToString.

The string representation returned by this method includes the name of the exception, the value of the FileLoadException.Message the value of the FileLoadException.FileName property, and the result of calling Environment.StackTrace. If any of these members is a null reference, its value is not included in the returned string.

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