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App Inventor 2 字典 vs 列表：同样存数据，性能差了10倍？ - App应用开发 ...
...ize="4"><b>App Inventor 2 字典 vs 列表：同样存数据，性能差了10倍？</b></font><br><br><br>在做 App 开发时，你可能会遇到这样一个场景：要存储一组学生信息，包含姓名、年龄、班级，然后需要快速根据姓名查到对应的班级。用列表也能...
Should accessing SharedPreferences be done off the UI Thread?
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187
I'm glad you're already playing with it!
Some things to note: (in lazy bullet form)
if thi...
Visual Studio: How to “Copy to Output Directory” without copying the folder structure?
...emGroup>
Note that this entry may not be visible from Visual Studio (2012, 2015, 2017), but once manually added to the csproj, it will appear in Visual Studio. The target path will not be editable through the UI though.
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How to download a single commit-diff from GitHub?
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215
OK, found the answer myself.
Adding .patch (or .diff) to the commit-URL will give a nice patch...
Stop Visual Studio from mixing line endings in files
When opening a text based file in Visual Studio 2010 it will then write my edits with CRLF instead of the line ending format of the original file. How can I stop VS from doing this? Any half decent editor should have this capability.
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Combining C++ and C - how does #ifdef __cplusplus work?
...pective.
Now, specifically regarding your numbered questions:
Regarding #1: __cplusplus will stay defined inside of extern "C" blocks. This doesn't matter, though, since the blocks should nest neatly.
Regarding #2: __cplusplus will be defined for any compilation unit that is being run through th...
Repeater, ListView, DataList, DataGrid, GridView … Which to choose?
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145
It's really about what you trying to achieve
Gridview - Limited in design, works like an htm...
Using Transactions or SaveChanges(false) and AcceptAllChanges()?
...tionScope scope = new TransactionScope())
{
//Do something with context1
//Do something with context2
//Save and discard changes
context1.SaveChanges();
//Save and discard changes
context2.SaveChanges();
//if we get here things are looking good.
scope.Complete();
}...
node.js child process - difference between spawn & fork
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219
Spawn is a command designed to run system commands. When you run spawn, you send it a system c...
What is the difference between isinstance('aaa', basestring) and isinstance('aaa', str)?
...ck whether an object is an instance of str or unicode
>>> string1 = "I am a plain string"
>>> string2 = u"I am a unicode string"
>>> isinstance(string1, str)
True
>>> isinstance(string2, str)
False
>>> isinstance(string1, unicode)
False
>>> isi...