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Web Reference vs. Service Reference
I just hit a huge brick wall with Paypal. I had created a regular C# project to create some wrapper classes using their WSDL.
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What's the difference between detaching a Fragment and removing it?
In the Android docs for a FragmentTransaction I noticed two very similar methods: detach and remove . The descriptions over there don't seem to provide much insight about when to use each, and from what I can tell they appear to be the same.
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Convert column classes in data.table
I have a problem using data.table: How do I convert column classes? Here is a simple example: With data.frame I don't have a problem converting it, with data.table I just don't know how:
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Sample random rows in dataframe
I am struggling to find the appropriate function that would return a specified number of rows picked up randomly without replacement from a data frame in R language? Can anyone help me out?
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c++提取复数的实部和虚部 - C/C++ - 清泛网 - 专注C/C++及内核技术
c++提取复数的实部和虚部plural_real_part_imaginary_part输入一个复数，即可输出它的实部和虚部。
#include<iostream>
#include<string>
using namespace std;
typedef float REAL;
#define MAX_BUF_LEN 256
typedef struct COMPLEX
{
REAL r; // 实部
REAL i...
c++ Timer使用总结 - C/C++ - 清泛网 - 专注C/C++及内核技术
c++ Timer使用总结本文总结了窗口应用程序、控制台程序、多线程中分别使用Timer的方法，均提供实例参考。窗口应用程序使用Timer：
#define TIMER_ID 1000 //定时器ID，可任意。触发后回调函数中用于区别不同的定时器以执行不同的...
C# DropDownList with a Dictionary as DataSource
...xtField and DataValueField of a Dropdownlist (languageList) using a Dictionary (list) of languageCod (en-gb) as key and language name (english) as the text to display.
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What is the _snowman param in Ruby on Rails 3 forms for?
In Ruby on Rails 3 (currently using Beta 4), I see that when using the form_tag or form_for helpers there is a hidden field named _snowman with the value of ☃ ( Unicode \x9731) showing up.
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What is the difference between ELF files and bin files?
The final images produced by compliers contain both bin file and extended loader format ELf file ,what is the difference between the two , especially the utility of ELF file.
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What is the AppDelegate for and how do I know when to use it?
...pps. How do I know when I should be putting stuff in AppDelegate versus a custom class? Is there a rule or any type of analogy with another programming language like Python or PHP that uses an AppDelegate like pattern?
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