C# variable declaring

[Dragas]

Ok my quiestion is about varibles something like in VFox:

string variable;
for(int i=0; i=10 ; i++)
{
variable = "mem"+i.SoStrin g();
// now part i need some solution in fox would be like this &variable
string &variable;

}
mem2 = "Somthing.. .";

So question is easy way to declare variable from data in other variable....

Thx

[Curtis Rutland]

I have no idea what the goal you are trying to achieve is. Are you trying to concatenate strings? If so, you can use the += operator:

string s = "something ";
string t = "else";
s += t;
//now s contains "something else"

If this doesn't answer your question, please clarify.

[r035198x]

1.) Careful with your typing. ToString != SoString and
for(int i =0; i=10;i++) != for(int i = 0; i<10;i++)
2.) Do not use + to concatenate strings in a loop. Use a StringBuilder instead.

[artov]

C# is not interpreted language, so you cannot create variables at the runtime.
However, you might like to check reflection, where you can compile and load
code at the runtime. I have used it in creating classes and instatiating objects
from the created classes and then calling methods from it.

[Dragas]

Ok sorry for bad typing but problem is:

string var1 = "var2";

So var1 have name of my new variable i want to declare

// code i have problem //
var2 = "It works now";


Thx for replys

[r035198x]

Ok sorry for bad typing but problem is:

string var1 = "var2";

So var1 have name of my new variable i want to declare

// code i have problem //
var2 = "It works now";


Thx for replys

Not possible.
Why do you want to do that?

[Dragas]

Well have some bookkeeping prog which is writen in VFOX as client,
we migrating to C# and porting most code.

In VFox we used alot &var1 (macro sign) which do that what i want.

All forms, classes ... are in tables, so i from tables take all i need
and making forms, toolbars, menus on fly and rest things ...

So that would come handy but if cant cant.

Anyway thx all for replys

[cloud255]

string var1 = "var2";

So var1 have name of my new variable i want to declare

// code i have problem //
var2 = "It works now";

This will cause a compiler error, something along the lines of "use of unasigned variable" i think.
What you have done is create a string (var1) which has a value of "var2" . That part is ok. but now you have a line saying "var2 =" the compiler has no idea what a var2 is...
You need to declare var2 first.

[Plater]

If you want to be able to reference variables by a string name, take a look at some of the collections. Like a Dictionary<stri ng,object>.

[code=c#]
Dictionary<stri ng, object> myd = new Dictionary<stri ng, object>();
myd.Add("var1", "var2");
myd.Add("var2", "it works now");
myd.Add("var3", 12);//this just shows you can add other datatypes
string mys =myd[myd["var1"].ToString()].ToString();
//mys will now be "this works now"
[/code]

[Plater]

If you want to be able to reference variables by a string name, take a look at some of the collections. Like a Dictionary<stri ng,object>.

[code=c#]
Dictionary<stri ng, object> myd = new Dictionary<stri ng, object>();
myd.Add("var1", "var2");
myd.Add("var2", "it works now");
myd.Add("var3", 12);//this just shows you can add other datatypes
string mys =myd[myd["var1"].ToString()].ToString();
//mys will now be "this works now"
[/code]

If you need to be able to instanciate classes from strings like you mentioned in a table, you will need to to use System.Reflecti on, or start to re-think your code plan.

[cloud255]

If you want to be able to reference variables by a string name, take a look at some of the collections. Like a Dictionary<stri ng,object>.

[code=c#]
Dictionary<stri ng, object> myd = new Dictionary<stri ng, object>();
myd.Add("var1", "var2");
myd.Add("var2", "it works now");
myd.Add("var3", 12);//this just shows you can add other datatypes
string mys =myd[myd["var1"].ToString()].ToString();
//mys will now be "this works now"
[/code]

hey there,

could you provide some explanation on this please?

the way i read it is that you are creating an objec "var2" as a value for the key "var1". how is the dictionary then aware that "var2" is a key and not just some random string?

thanks in advance

[Plater]

hey there,

could you provide some explanation on this please?

the way i read it is that you are creating an objec "var2" as a value for the key "var1". how is the dictionary then aware that "var2" is a key and not just some random string?

thanks in advance

Dictionary.Add( key,value)
And since my Dictionary defined the key to be of type string and the value of type object, my Add function is
Dictionary.Add( string key, object value)

[cloud255]

Dictionary.Add( key,value)
And since my Dictionary defined the key to be of type string and the value of type object, my Add function is
Dictionary.Add( string key, object value)

yeah this is what i dont get, how is the dictionary aware that the object "var2" is actaully a key within itself and not something else,
doesn't the dictionary see "var1" as an object with a set string value of "var2".
sorry if i sound stupid, but i just dont see how this works...

[Plater]

(Ignoring the integer) I added two values to my dictionary. One value called "var1" and one value called "var2" with the given values.
As far as the dictionary is concerned, I have done this:
[code=c#]
object var1="var2";
object var2="it works now";
[/code]

And since Dictionary[key] for me is Dictionary[string key], all I need to do is provide a key name in the form of a string and I can get the value.
I shortened up my code in the example.

It could be expanded out a little to this:
[code=c#]
Dictionary<stri ng, object> myd = new Dictionary<stri ng, object>();
myd.Add("var1", "var2");
myd.Add("var2", "it works now");
string akeyname=myd["var1"].ToString();
string mys =myd[akeyname].ToString();
//mys will now be "this works now"
[/code]

[cloud255]

(Ignoring the integer) I added two values to my dictionary. One value called "var1" and one value called "var2" with the given values.
As far as the dictionary is concerned, I have done this:
[code=c#]
object var1="var2";
object var2="it works now";
[/code]

And since Dictionary[key] for me is Dictionary[string key], all I need to do is provide a key name in the form of a string and I can get the value.
I shortened up my code in the example.

It could be expanded out a little to this:
[code=c#]
Dictionary<stri ng, object> myd = new Dictionary<stri ng, object>();
myd.Add("var1", "var2");
myd.Add("var2", "it works now");
string akeyname=myd["var1"].ToString();
string mys =myd[akeyname].ToString();
//mys will now be "this works now"
[/code]

ah i see,

its actaully a pretty nice trick this.

thank you, for the patience and the explanation