大约有 37,000 项符合查询结果（耗时：0.0660秒） [XML]
Check if a given key already exists in a dictionary
... intended way to test for the existence of a key in a dict.
d = {"key1": 10, "key2": 23}
if "key1" in d:
print("this will execute")
if "nonexistent key" in d:
print("this will not")
If you wanted a default, you can always use dict.get():
d = dict()
for i in range(100):
key = i % 1...
How to crop an image using C#?
...aphics g = Graphics.FromImage(target))
{
g.DrawImage(src, new Rectangle(0, 0, target.Width, target.Height),
cropRect,
GraphicsUnit.Pixel);
}
share
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Why doesn't C have unsigned floats?
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edited Feb 4 '09 at 16:29
answered Feb 4 '09 at 16:16
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Globally catch exceptions in a WPF application?
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answered Apr 27 '09 at 11:28
David SchmittDavid Schmitt
53.5k2626 gold badges116116 silver badges158158 bronze badges
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Encrypting & Decrypting a String in C# [duplicate]
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UPDATE 23/Dec/2015: Since this answer seems to be getting a lot of upvotes, I've updated it to fix silly bugs and to generally improve the code based upon comments and feedback. See the end of the post for a list of specific improvements.
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Creating a byte array from a stream
...c static byte[] ReadFully(Stream input)
{
byte[] buffer = new byte[16*1024];
using (MemoryStream ms = new MemoryStream())
{
int read;
while ((read = input.Read(buffer, 0, buffer.Length)) > 0)
{
ms.Write(buffer, 0, read);
}
return ms....
Get record counts for all tables in MySQL database
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edited May 17 '17 at 0:15
JayRizzo
1,66222 gold badges2121 silver badges3333 bronze badges
answered...
How to sort by two fields in Java?
...ame();
int sComp = x1.compareTo(x2);
if (sComp != 0) {
return sComp;
}
Integer x1 = ((Person) o1).getAge();
Integer x2 = ((Person) o2).getAge();
return x1.compareTo(x2);
}});
}
List<Persons> is now ...
What characters are allowed in DOM IDs? [duplicate]
...h the Name production.
NameStartChar ::= ":" | [A-Z] | "_" | [a-z] | [#xC0-#xD6] |
[#xD8-#xF6] | [#xF8-#x2FF] |
[#x370-#x37D] | [#x37F-#x1FFF] |
[#x200C-#x200D] | [#x2070-#x218F] |
[#x2C00-#x2FE...