Useful Exception Classes


The following table lists some useful exception classes.

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Class

Purpose

AmbiguousMatchException

The program could not figure out which overloaded object method to use.

ApplicationException

This is the ancestor class for all nonfatal application errors. When you build custom exception classes, you should inherit this class or one of its descendants.

ArgumentException

An argument is invalid.

ArgumentNullException

An argument that cannot be Nothing has value Nothing.

ArgumentOutOfRangeException

An argument is out of its allowed range.

ArithmeticException

An arithmetic, casting, or conversion operation has occurred.

ArrayTypeMismatchException

The program tried to store the wrong type of item in an array.

ConfigurationException

A configuration setting is invalid.

ConstraintException

A data operation violates a database constraint.

DataException

The ancestor class for ADO.NET exception classes.

DirectoryNotFoundException

A needed directory is missing.

DivideByZeroException

The program divided by zero.

DuplicateNameException

An ADO.NET operation encountered a duplicate name (for example, it tried to create a second table with the same name).

EvaluateException

Occurs when a DataColumn’s Expression property cannot be evaluated.

FieldAccessException

The program tried to access a class property improperly.

FormatException

An argument’s format doesn’t match its required format. For example, Integer.Parse(“Oops”).

IndexOutofRangeException

The program tried to access an item outside of the bounds of an array or other container.

InvalidCastException

The program tried to make an invalid conversion. For example, CInt(“oops”).

InvalidOperationException

The operation is not currently allowed.

IOException

The ancestor class for input/output (I/O) exception classes. A generic I/O error occurred.

EndOfStreamException

A stream reached its end.

FileLoadException

Error loading a file.

FileNotFoundException

Error finding a file.

InternalBufferOverflowException

An internal buffer overflowed.

MemberAccessException

The program tried to access a class member improperly.

MethodAccessException

The program tried to access a class method improperly.

MissingFieldException

The program tried to access a class property that doesn’t exist.

MissingMemberException

The program tried to access a class member that doesn’t exist.

MissingMethodException

The program tried to access a class method that doesn’t exist.

NotFiniteNumberException

A floating-point number is PositiveInfinity, NegativeInfinity, or NaN (not a number). You can get these values from the floating-point classes as in Single.Nan or Double.PositiveInfinity.

NotImplementedException

The requested operation is not implemented.

NotSupportedException

The requested operation is not implemented. For example, the program might be asking a routine to modify data that was opened read-only.

NullReferenceException

The program tried to use an object reference that is Nothing.

OutOfMemoryException

There isn’t enough memory. For example, if the user wants to generate a really huge data set, you may be able to predict how much memory the program will need, see if it is available, and throw this exception if it is not.

OverflowException

An arithmetic, casting, or conversion operation created an overflow. For example, if X is a Byte variable containing the value 100, then the statement X = X * X throws this error.

PolicyException

Policy prevents the code from running.

RankException

A routine is trying to use an array with the wrong number of dimensions.

ReadOnlyException

The program tried to modify read-only data.

ResourceException

A needed resource is missing.

SecurityException

A security violation occurred.

SyntaxErrorException

A DataColumn’s Expression property contains invalid syntax.

UnauthorizedAccessException

The system is denying access because of an I/O or security error.




Visual Basic 2005 with  .NET 3.0 Programmer's Reference
Visual Basic 2005 with .NET 3.0 Programmer's Reference
ISBN: 470137053
EAN: N/A
Year: 2007
Pages: 417

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