Need to find/create a Delphi compatible version of Messagepack or BSON.
–jeroen
Archive for the ‘C# 4.0’ Category
Reminder to Self: Messagepack / BSON / ProtocolBuffers
Posted by jpluimers on 2013/07/25
Posted in .NET, .NET 2.0, .NET 3.0, .NET 3.5, .NET 4.0, .NET 4.5, C#, C# 2.0, C# 3.0, C# 4.0, C# 5.0, Delphi, Delphi XE2, Delphi XE3, Development, Software Development | 4 Comments »
.NET/C# assemblies and namespaces
Posted by jpluimers on 2013/07/23
Ever since I started .NET programming after .NET Beta 1 Arrived in 2001, I found that many people struggle with the relation between assemblies and namespaces.
So I was glad that I posted this answer about 2.5 years ago on StackOverflow. Below is the slightly edited form:
People are easily confused by the namespace/assembly thing, as it decouples the concept of where your code is physically located (the assembly) and how you reference it:
- logically reference is by using the namespace
- physical reference is by referencing the assembly
I usually explain the relation using the word contribute:
- An assembly can contribute to multiple namespaces.
For instance, theSystem.Data.dllassembly contributes to namespaces likeSystem.Data(e.g. the classSystem.Data.DataTable) andMicrosoft.SqlServer.Server(e.g. the classMicrosoft.SqlServer.Server.SqlContext).- Multiple assemblies can contribute to a single namespace.
For instance both theSystem.Data.dllassembly and theSystem.Xml.dllassembly contribute to theSystem.Xmlnamespace.
Which means that if you use theSystem.Xml.XmlDataDocumentclass from your project, you need to reference theSystem.Data.dllassembly.
And if you use theSystem.Xml.XmlDocumentclass, you need to reference theSystem.Xml.dllfrom your project.(the above examples are .NET 4.0, but likely hold for previous .NET versions as well).
Danny Thorpe explained the concept of namespace and internal really well, so I won’t go into detail about those.
Ever since I started .NET courses 10 years ago, I draw a table explaining assemblies and namespaces like this:
| Assembly | Namespaces it contributes to | ||
|---|---|---|---|
| ↓ | System.Data | Microsoft.SQLServer.Server | System.Xml |
| ↑ Example classes | |||
| System.Data.dll | DataTable | SqlContext | XmlDataDocument |
| System.Xml.dll | — | — | XmlDocument |
–jeroen
via: C# assemblies, whats in an assembly? – Stack Overflow.
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C#: combining “adding `char` and `int` and “`a += b` means `a = a + b`, but `a += b + c` does not mean `a = a + b + c`”.
Posted by jpluimers on 2013/07/18
A while ago, I wrote about .NET/C# duh moment of the day: “A char can be implicitly converted to ushort, int, uint, long, ulong, float, double, or decimal (not the other way around; implicit != implicit)”.
There is another duh moment having to do with the various C# operators like += which is being described as being
a += bis equivalent to
a = a + b
You might think that this also holds:
a += b + cis equivalent to
a = (a + b) + c
But Eric Lippert has explained this is not the case: it is equivalent to:
a = a + (b + c)
In his explanation, he also shows the confusion can get you very surprising results if you mix string, chars and ints in the expression: depending on the statement and ordering, you either concatenate characters, or add ints to characters.
He also recommends you should not do concatenation: either use String.Format, or StringBuilder. I totally agree with that.
Recommended reading!
–jeroen
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Posted in .NET, C#, C# 1.0, C# 2.0, C# 3.0, C# 4.0, C# 5.0, Development, Software Development | Leave a Comment »
Using ILDASM to determine the .NET Framework version an Assembly/DLL requires (via StackOverflow)
Posted by jpluimers on 2013/07/11
Josh Stodola wrote a nice answer on the Determine .NET Framework version for dll – Stack Overflow question for using ILDASM to show the required .NET Framework/CLR version for an assembly.
From that, I wrote this tiny batch file:
ildasm.exe %1 /metadata[=MDHEADER] /text /noil | find "Metadata section:"
It gives output like this:
ildasm.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\System.XML.dll /metadata[=MDHEADER] /text /noil | find "Metadata section:"
// Metadata section: 0x424a5342, version: 1.1, extra: 0, version len: 12, version: v4.0.30319
The cool thing is that older ILDASM versions work on assemblies requiring newer .NET Frameworks/CLRs.
So it is relatively future proof.
–jeroen
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Posted in .NET, .NET 1.x, .NET 2.0, .NET 3.0, .NET 3.5, .NET 4.0, .NET 4.5, C#, C# 1.0, C# 2.0, C# 3.0, C# 4.0, C# 5.0, Development, Software Development | Leave a Comment »
“Fragile Base Class problem” C# posts by Eric Lippert
Posted by jpluimers on 2013/07/04
I’m not the only a big fan of almost anything that Eric Lippert writes on tech subjects on both his new personal Fabulous Adventures In Coding blog as well as his old microsoft Fabulous Adventures In Coding blog (a little more than half a year ago, he moved from Microsoft to Coverity.
On his old blog, he had a great series of posts on the “Fragile Base Class problem” (which he calls the Brittle Base Class problem) from a C# perspective.
Be sure to also read the comment threads, as they provide some very valuable information too (for instance, about Extension Methods that can make your code more fragile).
Recommended reading!
–jeroen
via: Browse by Tags – Fabulous Adventures In Coding – Site Home – MSDN Blogs.
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.NET/log4net configuration: LevelMatchFilter with DenyAllFilter to discard several log levels within a range
Posted by jpluimers on 2013/06/27
log4net configuration can be a tad intimidating at first.
When you do not want to log all levels, and the levels you want to log are not noncontinuous, then you can combine the LevelMatchFilter with a DenyAllFilter.
The filter classes in the log4net do not provide much help on this, but the filters section in the log4net manual is better.
This StackOverflow question has a very nice answer explaining it: Discarding several log levels within a range with log4net.
–jeroen
via: Discarding several log levels within a range with log4net – Stack Overflow.
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Samples Environment for Microsoft Chart Controls – Release: Samples for Chart Control – .NET Framework 4
Posted by jpluimers on 2013/06/19
I hadn’t done Charting for a while, but these got going very quickly:
There are example downloads for ASP.NET and WinForms requiring .NET 4 or higher.
In addition, these starting points also proved to be really helpful:
Since my objective was adding charts to an existing WinForms business app, this was the namespace at hand: System.Windows.Forms.DataVisualization.Charting Namespace ().
If you are at .NET 3.5, then start at DataVisualization.Charting.Chart simple example – C# – Snipplr Social Snippet Repository.
–jeroen
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Posted in .NET, .NET 4.0, .NET 4.5, ASP.NET, C#, C# 3.0, C# 4.0, Development, Software Development, VB.NET, Visual Studio 2010, WinForms | Leave a Comment »
C#/.NET/LINQ: DotNetStat: netstat.exe with TCP ports grouped by host
Posted by jpluimers on 2013/06/18
A lot of people have written .NET equivalents of netstat code. Basically there are two starting points:
- Use the built-in System.Net.NetworkInformation.IPGlobalProperties.GetIPGlobalProperties method, for instance by
– Build your own netstat.exe with c# | Tim Van Wassenhove.
– Netstat in C# « Towards Next. - A P/Invoke wrapper around the Windows IP Helper function GetExtendedTcpTable, which adds process information, for instance by
– windows – Which PID listens on a given port in c# – Stack Overflow.
– Netstat Example – CodeProject.
I adapted the first, made the output very much like the built-in Windows netstat, and added some LINQ code to demonstrate grouping and ordering.
Now you get grouped output like this:
Distinct Remote Address:Port pairs by Remote Address: 107.20.249.140 443 107.20.249.78 443 127.0.0.1 6421, 19872 192.168.1.81 17500, 61678 199.47.218.159 443 199.47.219.148 80 199.47.219.160 443 23.21.220.140 443 23.23.127.94 443
The code below is part of the DotNetStat example.
It demonstrates a few important LINQ aspects beyond the LINQ Query Expressions (C# Programming Guide) intro and 101 LINQ Samples in C#.:
- LINQ translates C# query keywords into framework members, for instance into extension methods in Enumerable Methods (System.Linq).
- LINQ uses delayed execution, so a lot of errors will not only absent during compile time, nor at LINQ query setup, but delayed until the portions of the query are being executed.
- In this case, it means that if you get the orderby wrong, you will get the an error like At least one object must implement IComparable inside the foreach loop.
- There is no distinct keyword, so you have to use one of the overloads of the Enumerable.Distinct Method (System.Linq).
- The group member by sub-member does not require an IComparable
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Posted in .NET, .NET 2.0, .NET 3.0, .NET 3.5, .NET 4.0, .NET 4.5, C#, C# 2.0, C# 3.0, C# 4.0, C# 5.0, Development, Jon Skeet, Software Development | Leave a Comment »
.NET/C# – CreateTemporaryRandomDirectory (via: Stack Overflow)
Posted by jpluimers on 2013/06/13
A while ago I needed unique temporary directories. This appears not to be standard functionality in the .NET System.IO.Path or System.IO.Directory class.
Josh Kelley asked a question about it before, and I adapted the example by Scott-Dorman based on GetTempPath and GetRandomFileName and comments by Chris into a more robust CreateTemporaryRandomDirectory one that works in .NET 2.0 and higher:
using System.IO;
namespace BeSharp.IO
{
public class DirectoryHelper
{
public static string GetTemporaryDirectory()
{
do
{
try
{
string tempPath = Path.GetTempPath();
string randomFileName = Path.GetRandomFileName();
string tempDirectory = Path.Combine(tempPath, randomFileName);
Directory.CreateDirectory(tempDirectory);
return tempDirectory;
}
catch (IOException /* ex */)
{
// continue
}
} while (true);
}
}
}
You can call it like this: Read the rest of this entry »
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.NET/C#: from Unicode to ASCII (yes, this is one-way): converting Diacritics to “regular” ASCII characters.
Posted by jpluimers on 2013/06/11
A while ago, I needed to export pure ASCII text from a .NET app.
An important step there is to convert the diacritics to “normal” ASCII characters. That turned out to be enough for this case.
This is the code I used which is based on Extension Methods and this trick from Blair Conrad:
The approach uses String.Normalize to split the input string into constituent glyphs (basically separating the “base” characters from the diacritics) and then scans the result and retains only the base characters. It’s just a little complicated, but really you’re looking at a complicated problem.
Example code:
using System;
using System.Text;
using System.Globalization;
namespace StringToAsciiConsoleApplication
{
class Program
{
static void Main(string[] args)
{
string unicode = "áìôüç";
string ascii = unicode.ToAscii();
Console.WriteLine("Unicode\t{0}", unicode);
Console.WriteLine("ASCII\t{0}", ascii);
}
}
public static class StringExtensions
{
public static string ToAscii(this string value)
{
return RemoveDiacritics(value);
}
// http://stackoverflow.com/questions/249087/how-do-i-remove-diacritics-accents-from-a-string-in-net
private static string RemoveDiacritics(this string value)
{
string valueFormD = value.Normalize(NormalizationForm.FormD);
StringBuilder stringBuilder = new StringBuilder();
foreach (System.Char item in valueFormD)
{
UnicodeCategory unicodeCategory = CharUnicodeInfo.GetUnicodeCategory(item);
if (unicodeCategory != UnicodeCategory.NonSpacingMark)
{
stringBuilder.Append(item);
}
}
return (stringBuilder.ToString().Normalize(NormalizationForm.FormC));
}
}
}
–jeroen
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Posted in .NET, .NET 3.5, .NET 4.0, .NET 4.5, ASCII, C#, C# 3.0, C# 4.0, C# 5.0, Development, Encoding, Software Development, Unicode | Leave a Comment »
The Wiert Corner - irregular stream of stuff 