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How to append output to the end of a text file
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The problem is that echo removes the newlines from the string. How do you append to a file a string which contains newlines?
– Timothy Swan
Dec 15 '17 at 21:25
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What is more efficient: Dictionary TryGetValue or ContainsKey+Item?
...a slight edge:
static void Main() {
var d = new Dictionary<string, string> {{"a", "b"}};
var start = DateTime.Now;
for (int i = 0; i != 10000000; i++) {
string x;
if (!d.TryGetValue("a", out x)) throw new ApplicationException("Oops");
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Shell脚本编程30分钟入门 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...引号。单双引号的区别跟PHP类似。
单引号
str='this is a string'
单引号字符串的限制：
单引号里的任何字符都会原样输出，单引号字符串中的变量是无效的
单引号字串中不能出现单引号（对单引号使用转义符后也不行）
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How do I ZIP a file in C#, using no 3rd-party APIs?
...ar target = Path.GetFullPath(Path.Combine(tempFolderPath, part.Uri.OriginalString.TrimStart('/')));
var targetDir = target.Remove(target.LastIndexOf('\\'));
if (!Directory.Exists(targetDir))
Directory.CreateDirectory(targetDir);
using (Stream...
Avoid web.config inheritance in child web application using inheritInChildApplications
...e inheritance. For example:
<!-- disable inheritance for the connectionStrings section -->
<location path="." inheritInChildApplications="false">
<connectionStrings>
</connectionStrings>
</location>
<!-- leave inheritance enabled for appSettings -->
<ap...
C++ map access discards qualifiers (const)
... map.find(KEY)->second; is unsafe when the map values are strings. It tends to print garbage when the KEY is not found.
– syam
Mar 8 '19 at 23:56
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What is the Java equivalent of PHP var_dump?
...maybe even in all classes you write...), you should implement a sensible toString method. So here you need to override toString() in your Person class and return the desired state.
There are utilities available that help with writing a good toString method, or most IDEs have an automatic toString(...
How do I efficiently iterate over each entry in a Java Map?
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Map<String, String> map = ...
for (Map.Entry<String, String> entry : map.entrySet()) {
System.out.println(entry.getKey() + "/" + entry.getValue());
}
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warning this call is not awaited, execution of the current method continues
...u need the result, you can change the GetNameAsync to return, say, Task<string>:
public static async Task<string> GetNameAsync()
{
string firstname = await PromptForStringAsync("Enter your first name: ");
string lastname = await PromptForStringAsync("Enter your last name: ");
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How do I get the YouTube video ID from a URL?
I want to get the v=id from YouTube’s URL with JavaScript (no jQuery, pure JavaScript).
39 Answers
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