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ÉùÃ÷Ò»¸öίÍÐpublic delegate int myCallBack(int x); ÔòÓøÃίÍвúÉúµÄ»Øµ÷·½·¨µÄÔ­ÐÍÓ¦¸ÃÊÇ£¨ B £©¡£
A. void myCallBack(int x) £»
B. int receive(int num) £»
C. string receive(int x) £»
D. ²»È·¶¨µÄ£»
[.NET(C#)]
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[.NET(C#)]
try {}ÀïÓÐÒ»¸öreturnÓï¾ä£¬ÄÇô½ô¸úÔÚÕâ¸ötryºóµÄfinally {}ÀïµÄcode»á²»»á±»Ö´ÐУ¬Ê²Ã´Ê±ºò±»Ö´ÐУ¬ÔÚreturnÇ°»¹ÊǺó
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[.NET(C#)]
д³ö³ÌÐòµÄÊä³ö½á¹û£º
public class A
{
public virtual void Fun1( int i )
{
Console.WriteLine( i );
}
public void Fun2( A a )
{
a.Fun1( 1 );
Fun1( 5 );
}
}
public class B : A
{
public override void Fun1( int i )
{
base.Fun1( i + 1 );
}
public static void Main()
{
B b = new B();
A a = new A();
a.Fun2( b );
b.Fun2( a );
}
}
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[.NET(C#)]
·ÖÎöÒÔÏ´úÂ룬Íê³ÉÌî¿Õ
string strTmp = ¡°abcdefgijijij¡±; //ÖмäÎÞ¿Õ¸ñ
int i = System.Text.Encoding.Default.GetBytes( strTmp ).Length;
int j = strTmp.Length;
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[.NET(C#)]
Ò»ÁÐÊýµÄ¹æÔòÈçÏÂ: 1¡¢1¡¢2¡¢3¡¢5¡¢8¡¢13¡¢21¡¢34¡­¡­ £»ÇóµÚ30λÊýÊǶàÉÙ£¬ÓõݹéË㷨ʵÏÖ¡£(C#ÓïÑÔ)
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class Program
{
public static void Main()
{
Console.WriteLine( Foo( 30 ) );
}
public static int Foo( int i )
{
if( i <= 0 )
return 0;
else if( i > 0 && i <= 2 )
return 1;
else
return Foo( i ¨C 1 ) + Foo( i ¨C 2 );
}
}
[.NET(C#)]
Çë±à³Ì±éÀúÒ³ÃæÉÏËùÓÐTextBox¿Ø¼þ²¢¸øËü¸³ÖµÎªstring.Empty
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foreach( System.Windows.Forms.Control control in this.Controls )
{
if( control is System.Windows.Forms.TextBox )
{
System.Windows.Forms.TextBox txtbox = ( System.Windows.Forms.TextBox )control;
txtbox.Text = string.Empty;
}
}
[.NET(C#)]
¹«Ë¾ÒªÇ󿪷¢Ò»¸ö¼Ì³ÐSystem.Windows.Forms.ListViewÀàµÄ×é¼þ£¬ÒªÇó´ïµ½ÒÔϵÄÌØÊ⹦ÄÜ£ºµã»÷ListView¸÷ÁÐÁРͷʱ£¬ÄÜ°´ÕÕµã»÷ÁеÄÿÐÐÖµ½øÐÐÖØÅÅÊÓͼÖеÄËùÓÐÐÐ (ÅÅÐòµÄ·½Ê½ÈçDataGridÏàËÆ)¡£¸ù¾ÝÄúµÄ֪ʶ£¬Çë¼òҪ̸һÏÂÄúµÄ˼·:
´ð£º¸ù¾Ýµã»÷µÄÁÐÍ·,°ü¸ÃÁеÄIDÈ¡³ö,°´ÕÕ¸ÃIDÅÅÐòºó,ÔÚ¸ø°ó¶¨µ½ListViewÖС£
[.NET(C#)]
String s = new String(¡°xyz¡±);´´½¨Á˼¸¸öString Object£¿
´ð£ºÁ½¸ö¶ÔÏó£¬Ò»¸öÊÇ¡°xyx¡±£¬Ò»¸öÊÇÖ¸Ïò¡°xyx¡±µÄÒýÓöÔÏñs¡£
[.NET(C#)]
Çë±à³ÌʵÏÖÒ»¸öðÅÝÅÅÐòËã·¨
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int[] array = new int[10];
int temp = 0;
public void Po()
{
for( int i = 0; i < array.Length ¨C 1; i++ )
{
for( int j = i + 1; j < array.Length; j++ )
{
if( array[j] < array[i] )
{
temp = array[i];
array[i] = array[j];
array[j] = temp;
}
}
}
}
[.NET(C#)]
ÇóÒÔϱí´ïʽµÄÖµ£¬Ð´³öÄúÏëµ½µÄÒ»ÖÖ»ò¼¸ÖÖʵÏÖ·½·¨£º1 ¨C 2 + 3 ¨C 4 +¡­¡­+ m
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public static void Main()
{
int input = int.Parse( Console.ReadLine() );
int sum = 0;
for( int i = 0; i <= input; i++ )
{
if( ( i % 2 ) == 1 )
{
sum += i;
}
else
{
sum = sum ¨C i;
}
}
Console.WriteLine( sum );
}
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int m = int.Parse( Console.ReadLine() );
int sum = 0;
bool flag = true;
for( int i = 1; i <= m; i++ )
{
if( flag )
sum += i;
else
sum -= i;
flag = !flag;
}
Console.WriteLine( sum );
[.NET(C#)]
ÔÚÏÂÃæµÄÀý×ÓÀï
class A
{
public A()
{
PrintFields();
}
public virtual void PrintFields()
{
}
}
class B : A
{
int x = 1;
int y;
public B()
{
y = -1;
}
public override void PrintFields()
{
Console.WriteLine( ¡°x={0},y={1}¡±, x, y );
}
}
µ±Ê¹ÓÃnew B()´´½¨BµÄʵÀýʱ£¬²úÉúʲôÊä³ö£¿
´ð°¸£ºx = 1, y = 0
[.NET(C#)]
¸ù¾ÝίÍÐ(delegate)µÄ֪ʶ£¬ÇëÍê³ÉÒÔÏÂÓû§¿Ø¼þÖдúÂëƬ¶ÎµÄÌîд£º
namespace test
{
public delegate void OnDBOperate();
public class UserControlBase : System.Windows.Forms.UserControl
{
public event OnDBOperate OnNew;
private void toolBar_ButtonClick( object sender, System.Windows.Forms.ToolBarButtonClick
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