RegEx help for a RegEx Newb - C# Discussion Boards

how to get a list of all avilable controls in a namespace

Amar Chaudhary4-Sep-07 5:21

4-Sep-07 5:21

I am working on a Project i am now a bit stuck as i want to show a list of controls from a namespace and display the selected control;
as visual studio does, as soon as we add reference to the library(dll) the controls are shown in tool box .
at first I am trying to get all controls from System.Windows.Forms

Any hint or link will be helpful

Thanks And regards
Amar Chaudhary

It is Good to be Important but!
it is more Important to be Good

Re: how to get a list of all avilable controls in a namespace

led mike4-Sep-07 5:39

led mike

4-Sep-07 5:39

Perhaps using Reflection

Re: how to get a list of all avilable controls in a namespace

Amar Chaudhary4-Sep-07 6:55

Amar Chaudhary

4-Sep-07 6:55

Thanks for the direction

I am getting Lot of types in MScoreLib.dll
but there is no "System.Windows.Forms"

code I used is
using System.Reflection;

on form load event

 Assembly a = Assembly.Load("MScorlib.dll");
 Type[] types = a.GetTypes();
 foreach (Type t in types)
 {
     //if (t.IsClass)
     listBox1.Items.Add(t.ToString());
 }
 MessageBox.Show(listBox1.Items.Count.ToString());
// MessageBox.Show(types.Length.ToString());

do you have any idea about this
Thanks And Regards
Amar Chaudhary

It is Good to be Important but!
it is more Important to be Good

Re: how to get a list of all avilable controls in a namespace

Amar Chaudhary4-Sep-07 7:00

Amar Chaudhary

4-Sep-07 7:00

Amar Chaudhary wrote:
Assembly a = Assembly.Load("MScorlib.dll");

When i pass System.windows.forms.dll instead of MScorlib.dll
it throws a file not found exception

It is Good to be Important but!
it is more Important to be Good

Re: how to get a list of all avilable controls in a namespace

Giorgi Dalakishvili4-Sep-07 7:18

Giorgi Dalakishvili

4-Sep-07 7:18

Amar Chaudhary wrote:
When i pass System.windows.forms.dll instead of MScorlib.dll
it throws a file not found exception

It is located at %SystemRoot%\Microsoft.net\Framework\v2.0.50727\System.Windows.Forms.dll

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Re: how to get a list of all avilable controls in a namespace

led mike4-Sep-07 7:28

led mike

4-Sep-07 7:28

Amar Chaudhary wrote:
When i pass System.windows.forms.dll instead of MScorlib.dll
it throws a file not found exception

GAC assemblies require more than just the DLL file name, like version, maybe culture. Try doing some research on MSDN to get the details.

Re: how to get a list of all avilable controls in a namespace

Amar Chaudhary4-Sep-07 19:44

Amar Chaudhary

4-Sep-07 19:44

Assembly a = Assembly.LoadWithPartialName("System.Windows.Forms");
Type[] types = a.GetTypes();
foreach (Type t in types)
{

    listBox1.Items.Add(t.ToString());
}
MessageBox.Show(listBox1.Items.Count.ToString());

this is giving result but with warning

Warning	1	'System.Reflection.Assembly.LoadWithPartialName(string)' is obsolete: 'This method has been deprecated. Please use Assembly.Load() instead. http://go.microsoft.com/fwlink/?linkid=14202'	E:\important\Articles for code project\Theme Applier for windows forms\EasyUI\UIApplier\UIMaker\ControlBrowser.cs	31	26	UIMaker

I am looking more into it Thanks for your help

It is Good to be Important but!
it is more Important to be Good

RegEx help for a RegEx Newb

flipdoubt4-Sep-07 5:04

flipdoubt

4-Sep-07 5:04

Can someone help me write a regular expression that will return a string from the beginning of the input string up until a certain string is reached? I know how to do this without regular expressions, but I want to use a regular expression so users can modify the format later.

Also, can someone recommend a good tutorial for using regular expressions to accomplish this kind of task using .NET?

Thanks.

Re: RegEx help for a RegEx Newb

Christian Graus4-Sep-07 5:11

Christian Graus

4-Sep-07 5:11

www.expresso.com, or search for Expresso on this site. It's a program that helps you build and test regex. Also, the regex book from O'Reiley is pretty awesome.

Christian Graus - Microsoft MVP - C++

"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

Re: RegEx help for a RegEx Newb

flipdoubt4-Sep-07 5:14

flipdoubt

4-Sep-07 5:14

But there is RegEx in general and then there is .NET's flavor of RegEx. Are you recommending the O'Reilly book for .NET?

Re: RegEx help for a RegEx Newb

Christian Graus4-Sep-07 6:04

Christian Graus

4-Sep-07 6:04

The O'Reilly book covers the different flavours in depth.

Christian Graus - Microsoft MVP - C++

"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

Re: RegEx help for a RegEx Newb

Joseph Guadagno4-Sep-07 5:14

Joseph Guadagno

4-Sep-07 5:14

I use http://regexlib.com/CheatSheet.aspx for Regular Expressions. There is also a "free" application to test .NET Regular Expressions http://www.sellsbrothers.com/tools/default.aspx#regexd.

Here are some of my articles.
Hope this helps!
Joseph Guadagno
http://www.josephguadagno.net

Re: RegEx help for a RegEx Newb

DavidNohejl4-Sep-07 6:03

DavidNohejl

4-Sep-07 6:03

+1 for http://regexlib.com[^]

[My Blog]
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Re: RegEx help for a RegEx Newb

ed^nrgc4-Sep-07 5:38

ed^nrgc

4-Sep-07 5:38

If I understand you correctly, it would be a simple case of creating a regex string of something like "^(?<mymatch>.*)"+ sMyTerminatorString. Then check the matches for mymatch (or whatever you name it).

Re: RegEx help for a RegEx Newb

Skippums4-Sep-07 12:12

Skippums

4-Sep-07 12:12

Look into RegexOptions.MultiLine to change whether "." matches newlines as well...

myRegex = new Regex("^.*?(?=myStringThatDelimitsTheEndOfTheMatch)");

Match m = myRegex.Match(sampleString);

if (m.Success) {
m.Value; // this returns only the part of the match
// that occured prior to your delimiting string
}

C# Generics - Using operators with generic objects

funkymint4-Sep-07 4:28

funkymint

4-Sep-07 4:28

I have the following function:

public bool getOperatorResult<T>(string operatorType, T operandA, T operandB)
        {
            //If the operands are boolean values.
            if (typeof(T) == typeof(bool))
            {
                System.Object obj = operandA;
                bool a = (bool) obj;
                obj = operandB;
                bool b = (bool) obj;
                switch (operatorType)
                {
                    case "or":
                        return (a || b);
                    case "and":
                        return (a && b);
                    case "equal":
                        return (a == b);
                    case "notequal":
                        return (a != b);
                    default:
                        return false;
                }
            }
            //If the operands are number values.
            else if ((typeof(T) == typeof(int)) || (typeof(T) == typeof(double)))
            {
                //Do something similar but for both int and double
            }
        }

This code works but just does not look right to me. Also in the second part where I look for numbers, I don't know how I can cast to either int or double. Any ideas

If I try to directly put in:

switch (operatorType)
                {
                    case "lessthan":
                        return (operandA < operandB);
                    case "morethan":
                        return (operandA > operandB);
                    case "lessthanequalto":
                        return (operandA <= operandB);
                    case "morethanequalto":
                        return (operandA >= operandB);
                    case "equal":
                        return (operandA == operandB);
                    case "notequal":
                        return (operandA != operandB);
                    default:
                        return false;
                }

I get compiler errors:

Operator '<' cannot be applied to operands of type 'T' and 'T'
.....
.....

Re: C# Generics - Using operators with generic objects

Christian Graus4-Sep-07 4:43

Christian Graus

4-Sep-07 4:43

Can you constrain your accepted types in order to enforce that they are comparable ?

Christian Graus - Microsoft MVP - C++

"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

Re: C# Generics - Using operators with generic objects

funkymint4-Sep-07 4:54

funkymint

4-Sep-07 4:54

I need to accept bool, string, and numbers (int's and doubles).

Re: C# Generics - Using operators with generic objects

DavidNohejl4-Sep-07 6:09

DavidNohejl

4-Sep-07 6:09

They all implement IComparable, don't they? Just use the where T:IComparable constrain in your generic method. Or perhaps use IComparable<T>.

Re: C# Generics - Using operators with generic objects

Urs Enzler4-Sep-07 4:55

Urs Enzler

4-Sep-07 4:55

Why do you use generics at all?

Wouldn't it just be simpler to do something like that:

public bool GetOperatorResult(string operator, bool a, bool b)
{
   // do bool stuff
}

public bool GetOperatorResult(string operator, int a, int b)
{
    // do int stuff
}

and let the runtime decide which overload should be called?

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Re: C# Generics - Using operators with generic objects [modified]

funkymint4-Sep-07 5:32

funkymint

4-Sep-07 5:32

I did think about this but I would have to create a function that does the same thing for every different type of number (int, double, long, etc....). Is there a way to get around this?

Also, I want to be able to pass in operands of type Object.

Thanks in advance.

-- modified at 11:42 Tuesday 4th September, 2007

Re: C# Generics - Using operators with generic objects

funkymint4-Sep-07 5:51

funkymint

4-Sep-07 5:51

How about if I created a function which takes operands of type Object and then calls other overloaded functions:

public bool getOperatorResult(string operatorType, System.Object operandA, System.Object operandB)
        {
            if (operandA is bool)
            {
                return getOperatorResult(operatorType, (bool)operandA, (bool)operandB);
            }
            else if (operandA is double)
            {
                return getOperatorResult(operatorType, (double)operandA, (double)operandB);
            }
            else if (operandA is int)
            {
                return getOperatorResult(operatorType, (int)operandA, (int)operandB);
            }
            else if (operandA is long)
            {
                return getOperatorResult(operatorType, (long)operandA, (long)operandB);
            }
            else if (operandA is string)
            {
                return getOperatorResult(operatorType, (string)operandA, (string)operandB);
            }
            else
            {
                return false;
            }
        }

public bool getOperatorResult(string operatorType, bool operandA, bool operandB)
        {
            switch (operatorType)
            {
                case "or":
                    return (operandA || operandB);
                case "and":
                    return (operandA && operandB);
                case "equal":
                    return (operandA == operandB);
                case "notequal":
                    return (operandA != operandB);
                default:
                    return false;
            }
        }

Re: C# Generics - Using operators with generic objects

Christian Graus4-Sep-07 6:06

Christian Graus

4-Sep-07 6:06

This is, at a minimum, not performant, as all your types are not objects, and would have to be boxed and unboxed.

Christian Graus - Microsoft MVP - C++

"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

Re: C# Generics - Using operators with generic objects

Skippums4-Sep-07 12:47

Skippums

4-Sep-07 12:47

for boolean operators such as ^, &, |, &&, and ||, just use a simple switch. Then, if either the type of object is not bool OR if the operator is not one of the preceding, then see if the object implements icomparable. If so (which int and double both do), then return one of the following (you could even check first to see if the comparison is EQUAL or NOTEQUAL, then use .Equals which all objects expose)

public bool compare(object A, object B, comparison comp) {

IComparable ic = A as IComparable;
object other = B;
if (ic == null) {
ic = B as IComparable;
other = A;
comp = SwitchComparison(comp); // simple function that changes
// <= to >=, < to >, and vice versa
}

// check if ic is null... if so, do whatever you think is appropriate

switch (comp) {
case EQUALS:
return ic.CompareTo(other) == 0;
case NOTEQUALS:
return ic.CompareTo(other) != 0;
case GT:
return ic.CompareTo(other) > 0;
...
}

Serialized objects [modified]

jblouir4-Sep-07 4:15

jblouir

4-Sep-07 4:15

Anyone know how to deserialize a file, but not load the whole thing in to memory?

Sort of like using a Hashtable, jumping to a point within the file, modifying the data and then closing. Rather than, opening the whole thing up, then rewriting the whole file over and over again.

Thanks

Jeremy Blush | :O

)

-- modified at 11:45 Tuesday 4th September, 2007

I think I may have found what I been looking for, it appears Memorystream might be what im looking for, anyone have any experience with this?

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