Main purpose of using an exception is to indicate error while running a program.
Excepton can be used for following conditions:
Note: Following sample is from MSDN
1) When method cannot completely define its funcionality
static void CopyObject(SampleClass original)
{
if (original == null)
{
throw new System.ArgumentException("Parameter cannot be null", "title");
}
}
2)If inapporiate call to an object is made
class ProgramLog
{
System.IO.FileStream logFile = null;
void OpenLog(System.IO.FileInfo fileName, System.IO.FileMode mode) {}
void WriteLog()
{
if (!this.logFile.CanWrite)
{
throw new System.InvalidOperationException("Logfile cannot be read-only");
}
// Else write data to the log and return.
}
}
3) When an argument to a method causes an exception
static int GetValueFromArray(int[] array, int index)
{
try
{
return array[index];
}
catch (System.IndexOutOfRangeException ex)
{
System.ArgumentException argEx = new System.ArgumentException("Index is out of range", "index", ex);
throw argEx;
}
}
4. Raise an exception
throw (new Exception("there is error in .... ...."));
Excepton can be used for following conditions:
Note: Following sample is from MSDN
1) When method cannot completely define its funcionality
static void CopyObject(SampleClass original)
{
if (original == null)
{
throw new System.ArgumentException("Parameter cannot be null", "title");
}
}
2)If inapporiate call to an object is made
class ProgramLog
{
System.IO.FileStream logFile = null;
void OpenLog(System.IO.FileInfo fileName, System.IO.FileMode mode) {}
void WriteLog()
{
if (!this.logFile.CanWrite)
{
throw new System.InvalidOperationException("Logfile cannot be read-only");
}
// Else write data to the log and return.
}
}
3) When an argument to a method causes an exception
static int GetValueFromArray(int[] array, int index)
{
try
{
return array[index];
}
catch (System.IndexOutOfRangeException ex)
{
System.ArgumentException argEx = new System.ArgumentException("Index is out of range", "index", ex);
throw argEx;
}
}
4. Raise an exception
throw (new Exception("there is error in .... ...."));
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