大约有 48,000 项符合查询结果（耗时：0.0612秒） [XML]
Convert from List into IEnumerable format
...c IEnumerable<Book> GetBooks()
{
List<Book> books = FetchEmFromSomewhere();
return books;
}
as well as:
public void ProcessBooks(IEnumerable<Book> books)
{
// do something with those books
}
which could be invoked:
List<Book> books = FetchEmFromSomewhere...
Truststore and Keystore Definitions
... with their corresponding public keys.
A truststore contains certificates from other parties that you expect to communicate with, or from Certificate Authorities that you trust to identify other parties.
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Can't subtract offset-naive and offset-aware datetimes
... have a timezone aware timestamptz field in PostgreSQL. When I pull data from the table, I then want to subtract the time right now so I can get it's age.
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How can I present a file for download from an MVC controller?
...
Return a FileResult or FileStreamResult from your action, depending on whether the file exists or you create it on the fly.
public ActionResult GetPdf(string filename)
{
return File(filename, "application/pdf", Server.UrlEncode(filename));
}
...
Load multiple packages at once
...dplyr, psych, tm)
and if the package is missing p_load will download it from CRAN or Bioconductor.
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What does “fragment” mean in ANTLR?
...tlr4 references book :
Rules prefixed with fragment can be called only from other lexer rules; they are not tokens in their own right.
actually they'll improve readability of your grammars.
look at this example :
STRING : '"' (ESC | ~["\\])* '"' ;
fragment ESC : '\\' (["\\/bfnrt] | UNICODE) ...
Using %f with strftime() in Python to get microseconds
...strftime accepts a timetuple that does not carry microsecond information.
from datetime import datetime
datetime.now().strftime("%H:%M:%S.%f")
Should do the trick!
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How to find the mime type of a file in python?
...ike this.
# For MIME types
import magic
mime = magic.Magic(mime=True)
mime.from_file("testdata/test.pdf") # 'application/pdf'
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地图组件（高德地图） · App Inventor 2 中文网
...特征的 可见性 属性值）。此列表还包含通过调用 FeatureFromDescription 在 地图 上创建的所有特征点。
高度
设置地图的垂直高度，以像素px为单位。
高度百分比
设置地图的垂直高度相对于整个屏幕高度的百分比。
纬度
获...
How to avoid circular imports in Python? [duplicate]
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Only import the module, don't import from the module:
Consider a.py:
import b
class A:
def bar(self):
return b.B()
and b.py:
import a
class B:
def bar(self):
return a.A()
This works perfectly fine.
...