в 15:31, 26 мая 2010

2010-05-26T15:31:53Z

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2010-05-26T12:19:20Z

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==Creating and throwing an exception object==

<source lang="csharp">using System;
class MainClass
{
public static void Main()
{
try
{
Exception myException = new Exception("myException");
myException.HelpLink = "See the Readme.txt file";
myException.Source = "My Program";
throw myException;
}
catch (Exception e)
{
Console.WriteLine("HelpLink = " + e.HelpLink);
Console.WriteLine("Message = " + e.Message);
Console.WriteLine("Source = " + e.Source);
Console.WriteLine("StackTrace = " + e.StackTrace);
Console.WriteLine("TargetSite = " + e.TargetSite);
}
}
}</source>
<pre class=codeResult>HelpLink = See the Readme.txt file
Message = myException
Source = My Program
StackTrace = at MainClass.Main()
TargetSite = Void Main()</pre>

==Manually throw an exception.==

<p>The general form is:</p>

<source lang="csharp">throw exceptOb;</source>

==Rethrow an exception==

<source lang="csharp">using System;

class MainClass {
public static void Main() {
try {
genException();
}
catch(IndexOutOfRangeException) {
// recatch exception
Console.WriteLine("Fatal error -- " +
"program terminated.");
}
}
public static void genException() {
int[] numer = { 4, 8};
int d = 0;

for(int i=0; i<10; i++) {
try {
Console.WriteLine(numer[i] + " / " +
numer[i] + " is " +
numer[i]/d);
}
catch (DivideByZeroException) {
// catch the exception
Console.WriteLine("Can"t divide by Zero!");
}
catch (IndexOutOfRangeException) {
// catch the exception
Console.WriteLine("No matching element found.");
throw; // rethrow the exception
}
}
}

}</source>
<pre class=codeResult>Can"t divide by Zero!
Can"t divide by Zero!
No matching element found.
Fatal error -- program terminated.</pre>

==Throw Exception from a function==

<source lang="csharp">using System;
class MainClass
{

static void AFunction()
{
int Zero = 0;
int j = 22 / Zero;
}
public static void Main()
{
try
{
Console.WriteLine("efore Function");
AFunction();
}
catch (DivideByZeroException e)
{
Console.WriteLine("DivideByZero {0}", e);
}
}
}</source>
<pre class=codeResult>efore Function
DivideByZero System.DivideByZeroException: Attempted to divide by zero.
at MainClass.Main()</pre>

==Throw Exception in finally statement==

<source lang="csharp">using System;
using System.Collections;
public class MainClass
{
static void Main() {
try {
try {
ArrayList list = new ArrayList();
list.Add( 1 );
Console.WriteLine( "Item 10 = {0}", list[10] );
}
finally {
Console.WriteLine( "Cleaning up..." );
throw new Exception( "I like to throw" );
}
}
catch( ArgumentOutOfRangeException ) {
Console.WriteLine( "Oops! Argument out of range!" );
}
catch {
Console.WriteLine( "Done" );
}
}
}</source>
<pre class=codeResult>Cleaning up...
Done</pre>

==Wrap exception in another one, adding additional context==

<source lang="csharp">using System;
public class MyClass
{
public void DoAverage()
{
try
{
int count = 0;
int average = 10 / count;
}
catch (DivideByZeroException e)
{

throw (new DivideByZeroException(
"Count is zero in DoAverage()", e));
}
}
}
public class MainClass
{
public static void Main()
{
MyClass my = new MyClass();
try
{
my.DoAverage();
}
catch (Exception e)
{
Console.WriteLine("Exception: {0}", e);
}
}
}</source>
<pre class=codeResult>Exception: System.DivideByZeroException: Count is zero in DoAverage() ---> System.DivideByZeroExcept
ion: Attempted to divide by zero.
at MyClass.DoAverage()
--- End of inner exception stack trace ---
at MyClass.DoAverage()
at MainClass.Main()</pre>

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в 15:31, 26 мая 2010

Admin: 1 версия