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c# primer note I

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1¡¢²»Óÿ¼ÂÇÊý×éÆðʼË÷ÒýÊǼ¸
int[] nArray = new int[100];
// Use "foreach" to loop array
foreach( int i in nArray )
2¡¢¶ÔÓÚ¶àάÊý×é²Ù×÷ÓÃforeach·Ç³£¼ò±ã
int[,] nVisited = new int[8,8];
// Use "for" to loop two-dimension array
for( int i = 0; i < nVisited.GetLength(0); i++ )
for( int j = 0; j < nVisited.GetLength( 1 ); j++ )
Debug.WriteLine( nVisited[i,j].ToString() );
// Use "foreach" to loop two-dimension array
foreach( int i in nVisited )
Debug.WriteLine( i.ToString() );
3¡¢foreachÀàÐÍת»»
// Init an arraylist object
int[] nArray = new int[100];
ArrayList arrInt = new ArrayList();
arrInt.AddRange( nArray );
// Use "foreach" to loop an arraylist
foreach( int i in arrInt )
Debug.WriteLine( i.ToString() );
// Use "for" to loop an arraylist
for( int i = 0; i < arrInt.Count; i++ )
{
int n = ( int ) arrInt[i];
Debug.WriteLine( n.ToString() );
}
Á½¸öÏÞÖÆ
ÔÚforeach²»ÄÜÐÞ¸Äö¾Ù³ÉÔ±£¬Æä´Î²»Òª¶Ô¼¯ºÏ½øÐÐɾ³ý²Ù×÷¡£
// Use "foreach" to loop an arraylist
foreach( int i in arrInt )
{
i++;//Can't be compiled
Debug.WriteLine( i.ToString() );
}
// Use "foreach" to loop an arraylist
foreach( int i in arrInt )
{
arrInt.Remove( i );//It will generate error in run-time
Debug.WriteLine( i.ToString() );
}
¸½--¶ÔÓڼǼ¼¯µÄ¶àÌõÊý¾Ýɾ³ý
¿ÉÒÔÓÃforÀ´ÊµÏÖ£¬ÓÉÓÚÔÚһЩ¼Ç¼¼¯ÖнøÐÐɾ³ýµÄʱºò£¬ÔÚɾ³ý²Ù×÷Ö®ºóÏàÓ¦µÄË÷ÒýÒ²·¢ÉúÁ˱仯£¬ÕâʱºòµÄɾ³ýÒª·´¹ýÀ´½øÐÐɾ³ý
// Use "for" to loop an arraylist
for( int i = arrInt.Count - 1; i >=0; i-- )
{
int n = ( int ) arrInt[i];
if( n == 5 )
arrInt.RemoveAt( i ); // Remove data here
Debug.WriteLine( n.ToString() );
}
http://blog.csdn.net/huang7914/archive/2008/04/16/2296176.aspx

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