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If i have a string, lets say the string is "System.Float".
Is there anyway i can get the type from that string? (ie a float).
And do something like this:
Float f = new GetMagicTypes<"System.Float">();
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Huh?
You can get the type using: Type.GetType("System.Single"), etc, but you can't use that as a template argument.
And your example is going to create a GetMagicTypes object, not a float.
GetMagicTypes<float> f = new GetMagicTypes<float>();
What are you trying to accomplish?
- S
50 cups of coffee and you know it's on!
A post a day, keeps the white coats away!
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What im doing is that im parsing the object type from xml, so i need a way to allocate an object of the type in the string.
Something like this then maybe:
Float f = new<type.gettype("system.float")>();
Ofcourse i could do this:
if("System.Float" == type)
Float f = new System.Float;
elseif("System.Boolean" == type)
Boolean b = new System.Boolean;
But that is an unnessecary thing if c# has support for string<->type conversion
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Well...you can't know at compile time what you're going to get at runtime, so you can't strongly type it.
If you want the xml value to be a float, then you'll have to coerce it.
float f;
float.TryParse(your xml value, out f);
Same with all the other types, int, bool, etc.
- S
50 cups of coffee and you know it's on!
A post a day, keeps the white coats away!
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Hi,
have a look at the Activator class and its CreateInstance method.
Luc Pattyn [Forum Guidelines] [My Articles]
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Awesome! many thanks, just what i was looking for
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This will still just get you an object, so if you want to do anything with it, you'll have to cast it to the type you want, which might be fine for what your doing?
- S
50 cups of coffee and you know it's on!
A post a day, keeps the white coats away!
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A) This may be a good place to use var.
B) Accessing Reflection can be time-consuming, so I prefer to cache the results.
C) Typically, in situations like this, I use a Dictionary. Here I might suggest a Dictionary<string,System.Reflection.ConstructorInfo>. Populate it with the expected/allowed types your application should support. Then something like:
var x = dic [ somestring ].Invoke() ;
would invoke the constructor and return an instance of whatever type was requested (or fail). However, it's Sunday morning and I'm still on my first cup of coffee, so I don't expect the above syntax to be correct (I'm pretty sure it isn't, but it should communicate the concept well enough).
D) If you want to support types that aren't known at compile time, you will need to learn how to dynamically load assemblies. There are several articles on that here.
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Real programmers start lettering with @) not A)
Luc Pattyn [Forum Guidelines] [My Articles]
- before you ask a question here, search CodeProject, then Google
- the quality and detail of your question reflects on the effectiveness of the help you are likely to get
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A is just a meaningless label. Maybe I'll use GUIDs next time.
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Hi all,
Can any one please tell me that how can i change the color of second line in rich text box?
My requirement is first line in richtext box should be blue and second line should be red.
Thanks in advance
Lijo
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select the text and change selection color
e.g.
RTB.SelectionColor = Color.Red;
TVMU^P[[IGIOQHG^JSH`A#@`RFJ\c^JPL>;"[,*/|+&WLEZGc`AFXc!L
%^]*IRXD#@GKCQ`R\^SF_WcHbORY87֦ʻ6ϣN8ȤBcRAV\Z^&SU~%CSWQ@#2
W_AD`EPABIKRDFVS)EVLQK)JKQUFK[M`UKs*$GwU#QDXBER@CBN%
R0~53%eYrd8mt^7Z6]iTF+(EWfJ9zaK-iTV.C\y<pjxsg-b$f4ia> -----------------------------------------------
128 bit encrypted signature, crack if you can
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First you need to change the color of the text before putting it in the rtb.
rtb.SelectionColor = System.Drawing.Color.Red;
rtb.AppendText(outText);
changing other attributes
rtb.SelectionColor = System.Drawing.Color.Blue;
System.Drawing.Font fBold = new System.Drawing.Font("Courier New", 10, fontBold);
rtb.SelectionFont = fBold;
rtb.AppendText(outText);
good luck
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Dear sir,
there are two projects in single dotnet IDE. every project included in separate namespaces.
i want to use one project reference to another project or namespace .
how can i do this???
i tried to use through "using " keyword , but it is not working and giving runtime error.
like this:
The type or namespace name 'TechWayHosting' could not be found (are you missing a using directive or an assembly reference?) D:\Yogesh_Backup\yogesh\New Folder\TechWayHosting-1st April 2009\FTPLibrary\User Controls\FileBrowserControl.cs FTPLibrary
yogesh
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yogesh_softworld123 wrote: are you missing a using directive or an assembly reference?
You have a using directive, so what could be missing?
right-click on the project in the solution pane and fix it.
yogesh_softworld123 wrote: giving runtime error
this is a compile-time error, not a run-time error. Your app is not running yet.
Luc Pattyn [Forum Guidelines] [My Articles]
- before you ask a question here, search CodeProject, then Google
- the quality and detail of your question reflects on the effectiveness of the help you are likely to get
- use the code block button (PRE tags) to preserve formatting when showing multi-line code snippets
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Hi,
You used the "using" directive, which is fine... But before that did u add the reference of the other project in "Add Reference" of your current project...?
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i have a form, i want to change the time and/or date of the system
and now i have found the following code but it just generate errors
i don't know what is exactly the problem
it is not a run time error, it is a compilation error
i am using C# in visual studio 2008
here is the error message :
"Error 39 Attribute 'StructLayout' is not valid on this declaration type. It is only valid on 'class, struct' declarations. D:\visual studio projects\firstCSharp\firstCSharp\settings.cs 16 12 firstCSharp"
here is the code
public partial class settings : Form
{
[StructLayout(LayoutKind.Sequential)]
[DllImport("kernel32.dll", EntryPoint = "SetSystemTime", SetLastError = true)]
private static extern bool SetSystemTime(ref MyDateTime st);
[DllImport("kernel32.dll", EntryPoint = "GetSystemTime", SetLastError = true)]
private extern static void GetSystemTime(ref MyDateTime sysTime);
please tell me how can i handle this error
thank you everybody in Advance
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cppwxwidgetsss wrote: Attribute 'StructLayout' is not valid on this declaration type
Now how about this: a StructLayout tells something about the layout of a struct you define.
Throw it away.
BTW: an app should not mess around with the system settings, such as Regional Settings, current date/time, etc.
Luc Pattyn [Forum Guidelines] [My Articles]
- before you ask a question here, search CodeProject, then Google
- the quality and detail of your question reflects on the effectiveness of the help you are likely to get
- use the code block button (PRE tags) to preserve formatting when showing multi-line code snippets
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Luc Pattyn wrote: an app should not mess around with the system settings, such as Regional Settings, current date/time, etc.
Hear hear!
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Hello there,
I am having a little problem in implementing the separator line in Windows Form. I have taken a label control in my form and have set its height to 2 pixels and borderStyle to fixed3D and set the AutoSize property of the form to False. However, although a Bevel line is created in place of the label, but the line is not Wide. Its only a few centimetres wide. I have set the label wide property to 100-150 but no changes had taken place. Note that I am not implementing any coding here. I am just setting the property of the label. Please tell me, how can I widen the label (now bevel line) on my form according to my wish.
Your help will really be appreciated,
Thanx....
Rajdeep.NET 
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Dude, just paint a separator
In the OnPaint event handler of the form do the following
private void Form1_Paint(object sender, PaintEventArgs e)
{
e.Graphics.DrawLine(new Pen(Brushes.Gray), X1, Y1, X2, Y2);
}
Where X1, Y1, X2, Y2 are the coordinates were the line will be drawn
Welcome to the world of GDI, have fun
Harvey Saayman - South Africa
Software Developer
.Net, C#, SQL
you.suck = (you.Passion != Programming & you.Occupation == jobTitles.Programmer)
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Just a Minute!
How can I paint a separator? U said to pase the code in the OpPaint Event Handler, But I did not find any control in the toolbox like the OnPaint!
Help please,
this project's gotta do with my life and death....
plz plz plz help me....
Rajdeep.NET
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Just a Minute!
How can I paint a separator? U said to paste the code in the OpPaint Event Handler, But I did not find any control in the toolbox like the OnPaint!
Help please,
this project's gotta do with my life and death....
plz plz plz help me....
Rajdeep.NET
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Add a Panel, set its height, anchor it left and right, and set some BackColor.
And please go buy a tutorial book on C# and study that; in less than a week you would have learned ten times more than you have last week by asking all kinds of elementary questions.
Luc Pattyn [Forum Guidelines] [My Articles]
- before you ask a question here, search CodeProject, then Google
- the quality and detail of your question reflects on the effectiveness of the help you are likely to get
- use the code block button (PRE tags) to preserve formatting when showing multi-line code snippets
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