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【转】用App Inventor 2实现电子围栏功能 - App应用开发 - 清泛IT社区，为创新赋能！
...圆形），Polygon（多边形），Rectangle（矩形）。我这里用了Circle和Polygon。
步骤1 添加组件
组件说明：圆形围栏按钮：用于显示圆形围栏并判断当前位置是否在圆形围栏内多边形围栏按钮：用于显示多边形围栏...
How can I default a parameter to Guid.Empty in C#?
... be one of the very few design flaws of Python. I'm somewhat glad C# (and VB.Net) avoided this issue by simply disallowing new objects in default parameters... though there are times where this ability is really nice in PHP.
– BlueRaja - Danny Pflughoeft
Feb 2...
How do I make JavaScript beep?
...BlAABoAAAAA3CUgShLdGIxsY7AUABPRrgCABdDuQ5GC7DqPQCgbbJUAoRSUj+NIEig0YfyWUho1VBBBA//uQZB4ABZx5zfMakeAAAAmwAAAAF5F3P0w9GtAAACfAAAAAwLhMDmAYWMgVEG1U0FIGCBgXBXAtfMH10000EEEEEECUBYln03TTTdNBDZopopYvrTTdNa325mImNg3TTPV9q3pmY0xoO6bv3r00y+IDGid/9aaaZTGMuj9mpu9Mpio1dXrr5HERTZSmqU36A3CumzN/9Robv/Xx4v9ijkSRSNLQ...
.NET data structures: ArrayList, List, HashTable, Dictionary, SortedList, SortedDictionary — Speed,
...tifically to see which data structure is the fastest (I did the test using VB, but I imagine C# would be the same, since both languages do the same thing at the CLR level). You can see some benchmarking results conducted by me here (there's also some discussion of which data type is best to use in ...
Which is preferred: Nullable.HasValue or Nullable != null?
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In VB.Net. Do NOT use "IsNot Nothing" when you can use ".HasValue". I just solved an "Operation could destabilize the runtime" Medium trust error by replacing "IsNot Nothing" with ".HasValue" In one spot. I don't really under...
Generate class from database table
...
VB version
declare @TableName sysname = 'myTableName'
declare @prop varchar(max)
PRINT 'Public Class ' + @TableName
declare props cursor for
select distinct ' public property ' + ColumnName + ' AS ' + ColumnType AS prop
from...
Capture screenshot of active window?
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Hi can i know how to do screen capture in vb web form aspx?
– beny lim
Feb 2 '12 at 8:32
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What exactly are unmanaged resources?
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Let us first understand how VB6 or C++ programs (Non Dotnet applications) used to execute.
We know that computers only understand machine level code. Machine level code is
Why does Math.Round(2.5) return 2 instead of 3?
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I remember this behavior in VB before .NET got applied.
– John Fiala
Jun 10 '09 at 20:10
7
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Can you make just part of a regex case-insensitive?
...mo) (note Python re supports inline modifier groups since Python 3.6)
c# / vb.net / .net - Regex.Replace("fooFOOfOoFoOBARBARbarbarbAr", "(?i:foo)|BAR", "<$&>") (demo)
java - "fooFOOfOoFoOBARBARbarbarbAr".replaceAll("(?i:foo)|BAR", "<$0>") (demo)
perl - $s =~ s/(?i:foo)|BAR/<$&...