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Cleaner way to do a null check in C#? [duplicate]
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In a generic way, you may use an expression tree and check with an extension method:
if (!person.IsNull(p => p.contact.address.city))
{
//Nothing is null
}
Full code:
public class IsNullVisitor : ExpressionVisitor
{
public bool IsNull { get; private set; }
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How do I list one filename per output line in Linux?
I'm using ls -a command to get the file names in a directory, but the output is in a single line.
7 Answers
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Is there a simple way to remove multiple spaces in a string?
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This solution only handles single space characters. It wouldn't replace a tab or other whitespace characters handled by \s like in nsr81's solution.
– Taylor Leese
Oct 9 '09 at 22:21
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error C2662: “Screen::move”: 不能将“this”指针从“const Screen”转...
...ursor = row + c;
return *this;
}
const Screen& Screen::display(std::ostream& os) const
{
os << contents << '\n';
return *this;
}
//main中处理
myScreen.display(cout).move(4,0).set('#').display(cout);
解决办法：通过返回调用函数的对象的引用，可以将一些...
Mac OS X 平台有哪些好用的 SSH 客户端？ mac 怎么登录到 linux 服务器并传...
Mac OS X 平台有哪些好用的 SSH 客户端？ mac 怎么登录到 linux 服务器并传输文件？Mac OS X 平台有哪些好用的 SSH 客户端？mac 怎么登录到 linux 服务器并传输文件？推荐Cyberduck小黄鸭：下载地址：http: www.pc6...Mac OS X 平台有哪些好用的 ...
Mac OS X安装Bochs - 更多技术 - 清泛网 - 专注C/C++及内核技术
Mac OS X安装Bochs1.安装x11;2.开启Mac OS X的root用户3.configure我在这里遇到的问题是，提示我少一个这个头文件X11 extensions Xrandr.h谷歌了一下，机子...1.安装x11;
2.开启Mac OS X的root用户
3.configure
我在这里遇到的问题是，提示我少一个...
Why do we need the “finally” clause in Python?
...) but it's not a TypeError.
Other control flow statements such as continue and break statements.
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How do I set a variable to the output of a command in Bash?
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In addition to backticks `command`, command substitution can be done with $(command) or "$(command)", which I find easier to read, and allows for nesting.
OUTPUT=$(ls -1)
echo "${OUTPUT}"
MULTILINE=$(ls \
-1)
echo "${MULTILINE}"
Quoting (") does ma...
Running Command Line in Java [duplicate]
Is there a way to run this command line within a Java application?
8 Answers
8
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PostgreSQL: Is it better to use multiple databases with one schema each, or one database with multip
... will work with no trouble. So you definitely want to go with one database and multiple schemas within that database.
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