How to cancel the execution of a method?

Question

Consider i execute a method \'Method1\' in C#. Once the execution goes into the method i check few condition and if any of them is false, then the execution of Method1 shou

Answer 1

You could setup a guard clause with a return statement:

public void Method1(){

 bool isOK = false;

 if(!isOK) return; // <- guard clause

 // code here will not execute...


}

Answer 2

Use the return statement.

if(!condition1) return;
if(!condition2) return;

// body...

Answer 3

Are you talking about multi threading?

or something like

int method1(int inputvalue)
{
   /* checking conditions */
   if(inputvalue < 20)
   {
      //This moves the execution back to the calling function
      return 0; 
   }
   if(inputvalue > 100)
   {
      //This 'throws' an error, which could stop execution in the calling function.
      throw new ArgumentOutOfRangeException(); 
   }
   //otherwise, continue executing in method1

   /* ... do stuff ... */

   return returnValue;
}

Answer 4

There are a few ways to do that. You can use return or throw depending if you consider it an error or not.

Answer 5

I think this is what you are looking for.

if( myCondition || !myOtherCondition )
    return;

Hope it answered your question.

Edit:

If you want to exit the method due to an error you can throw an exception like this:

throw new Exception( "My error message" ); 

If you want to return with a value, you should return like before with the value you want:

return 0;

If it is the Exception you need you can catch it with a try catch in the method calling your method, for instance:

void method1()
{
    try
    {
        method2( 1 );
    }
    catch( MyCustomException e )
    {
        // put error handling here
    }

 }

int method2( int val )
{
    if( val == 1 )
       throw new MyCustomException( "my exception" );

    return val;
}

MyCustomException inherits from the Exception class.