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Does it have to be one-way or can it be a reversible operation? (Like: Is the ID a secret?)
I'd use some hash.
Cheers,
Sebastian
--
Contra vim mortem non est medicamen in hortem.
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hi everybody,
i want to know how to menage the optimistic cuncurrency using timestamp.
i've already added a column for every table (timestamp type).
how i can modify the Update command to use it?
(im using C# 2005)
Thank you in advance
Enrico
VentoEngine corp.
Program your life ^^
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In the c# programming guide it list several descriptions of a data type. One description is the "user-defined data type". And examples given are: class or interface.
What are some other user-defined data types?
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Is there any way of keeping count of the number of forms in a Visual C# WindowsApplication Project. I need to create a program which can be executed off a button in the VS IDE which will pop a message box that will keep track of the number of forms in the currently opened project in the VS IDE.
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How do i create and integrate a toolbar into the Visual Studio .NET 2005 IDE using C#. The extensibility projects provide me with Addins which allow for the creation of buttons, but what about a full-fledged toolbar.
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Holla,
I got a little problem here: I am developing this "little helper" under VS2003 and .NET1.1. I want to change the application's size in code (implementing a "show some/show all" toggle that also creates/disposes an "advanced options"-panel.)
I KNOW that I did this before, but I cannot figure out while it wont work now:
I currently have a button and in the click-handler I change the forms size as follows:
this.Size = new Size(300,400); // or
this.Width = 300;
this.Height = 400;
// and afterward, I get rid of the advanced panel.
doSomePanelHidingStuff();
According to the MSDN, that should be all thats necessary. When this didnt work, I tried some combinations of invalidating and refreshing the form, to no avail. I added the "refreshing" to a resize-event handler.
Whatever I do, the form's size wont change.
Any hints?
Cheers,
Sebastian
--
Contra vim mortem non est medicamen in hortem.
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Perhaps you have setted a maximum size for your form.
The attempt to change the forms size to a value larger than the one found in MaximumSize will fail...
protected internal static readonly ... and I wish the list could continue ...
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Actually, the size I am trying to change to varies.
No max-size, no min-size. The form wouldnt make much sense at a low-size, so I am calculating the new sizes.
If I switch from the "normal" form to the "advanced" form, the new size is oldsize + oldsize / 2, rounded to the next integer that is a multiple of three.
To scale down, the new size is the old size * 2/3, rounded to the next even integer.
That size calculation is independant of the size setting and I checked the result via stdout and debugger. The size is set correctly, but the form wont refresh to the new size.
Cheers,
Sebastian
--
Contra vim mortem non est medicamen in hortem.
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Usualy a managed form should change it's size when the width and/or heigth is changed...
But on special cases this operation is canceled :
- as I said in my initial post, if the form's MaximumSize is setted to a value smaller than the new size
- if you override the form's WndProc and ignore the WM_RESIZE message
These are possile cases that may stop your correct written code to resize a form.
If none of this applies check you code ... step by step it with the debugger and check if you do the correct thing.
protected internal static readonly ... and I wish the list could continue ...
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The string class in .Net (just as anyother classes) inherits from object. Object class has a static method ReferenceEquals which takes two parameters and returns true if both are referenced to the same value in the heap.
So in my code below,
<br />
string s1 = "ABC";<br />
string s2 = s1;<br />
<br />
string s3 = "ABC";<br />
string s4 = "ABC";<br />
I was expecting the S3 and S4 to have separate references. I may be answering my own questio here .. but if the string is intered then the second variable is pointed to the memory refernece of the original value. How can I differentiate if the S4 is not an actual refernece to S3?
- Malhar
-- modified at 10:40 Monday 6th February, 2006
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The thing to remember is that Strings in .NET are immutable--that is, they don't change. So, there is no point in differentiating between references to two identical strings.
Anyone who thinks he has a better idea of what's good for people than people do is a swine.
- P.J. O'Rourke
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One reason might be because "ABC" is interned by the framework. The JIT may do this to save memory, at the cost of getting bitten if you're relying on different strings for multithreading or native interop purposes.
Also, the compiler might be generating code like this:
string __val = "ABC";
string s1 = __val;
string s2 = __val;
The only way to tell for sure is use ILDasm or Reflector to disassemble your code and check out what's going on.
Tech, life, family, faith: Give me a visit.
I'm currently blogging about: Connor's Christmas Spectacular!
Judah Himango
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Judah Himango wrote: The JIT may do this to save memory
Eventhough this seems like a large overhead as the compiler/runtime would have to check if the string is loaded or not, I'd have expected some documentation for this in the string class.
Judah Himango wrote: ILDasm or Reflector to disassemble your code and check out what's going on.
Doesnt seem to be the case.
And if that were the case, compiler optimization would not even perform the equality check. It'd simply just return 'true'.
- Malhar
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I'd check if the string is interned. My guess is it is interned. You can check using string.IsInterned, which will return null if it is not interned (why the framework designers decided to return a string rather than a boolean is beyond me :P)
You might want to read this decent article on .NET strings[^], might be worth your time.
Tech, life, family, faith: Give me a visit.
I'm currently blogging about: Connor's Christmas Spectacular!
Judah Himango
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This is from ildasm.. we can see "ABC" is inserted twice
IL_0000: ldstr "ABC"<br />
IL_0005: stloc.0<br />
IL_0006: ldstr "ABC"<br />
IL_000b: stloc.1<br />
IL_000c: ldloc.0<br />
IL_000d: ldloc.1<br />
IL_000e: call bool [mscorlib]System.Object::ReferenceEquals(object, object)<br />
IL_0013: stloc.2<br />
IL_0014: br.s IL_0016<br />
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I agree with you that it is because of string interning. However, in this case, there is no way to distinguish if the two objects are different or not. So for the string class, the Equals and ReferenceEquals have no differentiation -- this is little bit frustrating!!
- Malhar
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You can clone a string to get a different instance with the same value.
Or if you use Substring, you will also get a different instance of the same string:
object.ReferenceEquals("Hello", "Hello World".Substring(0,5)) will return false!
Why is this frustrating? The runtime creates interned string instances when the method is JITted. This is much faster than creating the string instance everytime the method in run. If you want a new string instance every time, well, then you still can use Clone().
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<FONT color=DarkBlue>.method</FONT> <FONT color=DarkGreen></FONT> <FONT color=Blue>private hidebysig static</FONT>
<FONT color=Blue>void</FONT> Main(<FONT color=Blue>string</FONT><FONT color=DarkBlue>[]</FONT> args) <FONT color=Blue>cil managed</FONT>
<FONT color=DarkGreen>
{
<FONT color=DarkBlue>.entrypoint</FONT>
<FONT color=DarkGreen>
<FONT color=DarkGreen>
<FONT color=DarkBlue>.maxstack</FONT> <FONT color=Red>2</FONT>
<FONT color=DarkBlue>.locals</FONT> <FONT color=DarkGreen></FONT> <FONT color=Blue>init</FONT> (<FONT color=Blue>string</FONT> V_0<FONT color=DarkBlue>,</FONT>
<FONT color=Blue>string</FONT> V_1)
<FONT color=DimGray>IL_0000:</FONT> <FONT color=DarkGreen></FONT> <FONT color=DeepPink>ldstr</FONT> <FONT color=Maroon>"ABC"</FONT> <FONT color=DarkGreen></FONT>
<FONT color=DimGray>IL_0005:</FONT> <FONT color=DarkGreen></FONT> <FONT color=DeepPink>stloc.0</FONT>
<FONT color=DimGray>IL_0006:</FONT> <FONT color=DarkGreen></FONT> <FONT color=DeepPink>ldstr</FONT> <FONT color=Maroon>"ABC"</FONT> <FONT color=DarkGreen></FONT>
<FONT color=DimGray>IL_000b:</FONT> <FONT color=DarkGreen></FONT> <FONT color=DeepPink>stloc.1</FONT>
<FONT color=DimGray>IL_000c:</FONT> <FONT color=DarkGreen></FONT> <FONT color=DeepPink>ldloc.0</FONT>
<FONT color=DimGray>IL_000d:</FONT> <FONT color=DarkGreen></FONT> <FONT color=DeepPink>ldloc.1</FONT>
<FONT color=DimGray>IL_000e:</FONT> <FONT color=DarkGreen></FONT> <FONT color=DeepPink>call</FONT> <FONT color=Blue>bool</FONT> <FONT color=DarkBlue>[</FONT>mscorlib<FONT color=DarkGreen></FONT><FONT color=DarkBlue>]</FONT>System.Object<FONT color=DarkGreen></FONT>::ReferenceEquals(<FONT color=Blue>object</FONT><FONT color=DarkBlue>,</FONT>
<FONT color=Blue>object</FONT>) <FONT color=DarkGreen></FONT>
<FONT color=DimGray>IL_0013:</FONT> <FONT color=DarkGreen></FONT> <FONT color=DeepPink>call</FONT> <FONT color=Blue>void</FONT> <FONT color=DarkBlue>[</FONT>mscorlib<FONT color=DarkGreen></FONT><FONT color=DarkBlue>]</FONT>System.Console<FONT color=DarkGreen></FONT>::WriteLine(<FONT color=Blue>bool</FONT>) <FONT color=DarkGreen></FONT>
<FONT color=DimGray>IL_0018:</FONT> <FONT color=DarkGreen></FONT> <FONT color=DeepPink>call</FONT> <FONT color=Blue>string</FONT> <FONT color=DarkBlue>[</FONT>mscorlib<FONT color=DarkGreen></FONT><FONT color=DarkBlue>]</FONT>System.Console<FONT color=DarkGreen></FONT>::ReadLine() <FONT color=DarkGreen></FONT>
<FONT color=DimGray>IL_001d:</FONT> <FONT color=DarkGreen></FONT> <FONT color=DeepPink>pop</FONT>
<FONT color=DimGray>IL_001e:</FONT> <FONT color=DarkGreen></FONT> <FONT color=DeepPink>ret</FONT>
} <FONT color=DarkGreen>
xacc.ide-0.1.2.6
New syntax highlight screenshots of xacc.ide
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I'm written a crazy simple service in C# and a simple class library that exposes 1 class. We're talking "hello world" simple here.
Here's the wierdness.
I have a reference to the class library from the service, when I attempt to start the service, I get an event log entry saying that it can't find the class library.
Event log record-->
Service cannot be started. System.IO.FileNotFoundException: Could not load file or assembly 'SampleClass, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The system cannot find the file specified.
File name: 'SampleClass, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'
at RemotingTest.TestService.OnStart(String[] args)
at System.ServiceProcess.ServiceBase.ServiceQueuedMainCallback(Object state)
What I've tried.
Create a console app using the same code -> Works
Remove the calls to the class library and start the service -> Works
uninstall the service/reinstall the service and start the service -> Fails.
Copy the class library dll to the windows system32 directory -> Fails.
????
Any ideas? I'm sure that it is something really stupid, but I can't think of it.
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I suspect it has to do with security rights.
Anyone who thinks he has a better idea of what's good for people than people do is a swine.
- P.J. O'Rourke
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