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Why does .NET foreach loop throw NullRefException when collection is null?
...umerable.Empty<int>())
{
System.Console.WriteLine(string.Format("{0}", i));
}
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How to hide TabPage from TabControl [duplicate]
How to hide TabPage from TabControl in WinForms 2.0?
22 Answers
22
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How to take off line numbers in Vi?
...
180
If you are talking about show line number command in vi/vim
you could use
set nu
in comm...
What is the Python equivalent for a case/switch statement? [duplicate]
...n is a prime number\n"
# map the inputs to the function blocks
options = {0 : zero,
1 : sqr,
4 : sqr,
9 : sqr,
2 : even,
3 : prime,
5 : prime,
7 : prime,
}
Then the equivalent switch block is invoked:
options[num]()
T...
/usr/include/c++/4.9/bits/stl_iterator_base_types.h:165:53: error: ‘i...
...n fabs(a-b);
}
int main()
{
vector<int> age;
age.push_back(10);
age.push_back(15);
cout << distance(age[0],age[1]);
return 0;
}
这段代码初看起来并无错误,编译时提示上述错误,原因在于使用std命名空间,而std命名空间中已经有了std::d...
VC中CStatic等控件字体颜色的设置和OnCtlColor的使用 - C/C++ - 清泛网 - ...
...{
if (nCtlColor == CTLCOLOR_STATIC)
{
pDC->SetTextColor(RGB(0,0,255));//设置字体颜色
pDC->SetBkMode(TRANSPARENT); //设置背景透明
}
}
第三个参数OnCtlColor主要有以下的值：
CTLCOLOR_BTN 按钮控件
CTLCOLOR_DLG 对话框
CTLCOLOR_EDIT ...
解决WaitForSingleObject阻塞UI线程的问题 - C/C++ - 清泛网 - 专注C/C++及内核技术
..., FALSE, INFINITE, QS_ALLINPUT);
switch(dwRet)
{
case WAIT_OBJECT_0:
break; //break the loop
case WAIT_OBJECT_0 + 1:
//get the message from Queue
//and dispatch it to specific window
PeekMessage(&msg, NULL, 0, 0, PM_REMOVE);
DispatchMessage(&msg);
continue;
def...
MFC 获取当前时间的几种方法总结 - C/C++ - 清泛网 - 专注C/C++及内核技术
...me::GetCurrentTime();//获取当前的时间
COleDateTimeSpan timespan( 0, 8, 0, 0 ); //(Day, Hour, Minute, Second);
COleDateTime time=today + timespan; //Time比Today加了八小时
CString str;
str=time.Format("%H:%M %Y-%m-%d");
AfxMessageBox(str);
4.time_t（转换成秒）
SY...
解决 A potentially dangerous Request.Form value was detected from the ...
...strequestValidationMode validateRequest近日有客户在升级到Windows 2012 Server后，发现部分表单无法保存，经测试是由于使用了ASP.NET 4.0，默认安全性设置较高造成的。当表单...近日有客户在升级到Windows 2012 Server后，发现部分表单无法保存...
CSS counter-increment 属性经典详解 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...实例详解它的用法：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<style type="text/css">
body {counter-reset:section;}
h1 {counter-reset:subsection;}
h1:before
{
counter-increment:sectio...