The best overload method match system.IComparable has invalid arguments - C# Discussion Boards

George_George1-May-08 21:47

1-May-08 21:47

Thanks led mike,

Sorry it is my bad English. Now it is clear now. Sorry I have another question about the 1st link,

"On questions such as these, there are two ways to find the answer. The first is to build the code and look at the generated IL (or the resulting assembly, remembering that you get debug code if you run in the debugger. Attach to a running process, and then you get the optimized native code), or to time the code with a stopwatch."

I think either in debug mode in Visual Studio or attach to a running process, we can only debug through either the source code or the native code, any ways to debug through IL code in debug/release mode?

regards,
George

inserting string into string

stephan_00729-Apr-08 2:59

stephan_007

29-Apr-08 2:59

hy everyone!

sorry for me asking again, but i am not sure how to do this:

i read from a file which is a outputtemplate (i have fields in there which have to be replaced by it's values).

then there are two line which describes the table e.g.

|tag1_01|  |tag2_01|      |tag3_01|          |tag4_01|  |tag5_01|
     |tag6_01|      |tag7_01|      |tag8_01|

(the location of the tags and finally the values are important, because otherwise it won't appear to be a table Big Grin | :-D

the _01 is used to help me replace the tags with it's values.

so lets say i do want to duplicate this line ten times to finally have 11 lines.
the replacement of the _01 to _02 etc. isn't the challange for me, but i wonder how to insert the new lines at the correct location. because as far as i know i am only able to insert it at an index position. well, in my case i would try to find the _01 entries by reading line after line in the file. when i find it i copy these two lines to a tempstringvariable. then loop for the desired number, replace _01 by _02 etc.
now the tricky part: i have to find out at which position the two lines end. well i guess this is indexof(tempstring) + tempstring.length + 2 (linefeed). and then insert the lines + linefeeds into there.

but isn't there an easier way like "insert line after this line"?

thanks for any further hint which help me realize this in a more easy way!

stephan.

Re: inserting string into string

carbon_golem29-Apr-08 3:58

carbon_golem

29-Apr-08 3:58

I think you may have a knowledge representation issue here. You're representing the template with a single string, right? In that case, you've built a find-replace model where now you need an example-build model. Looks like you're going to either A) devise a very clever solution using your current system by changing the table template to a line template B) change your templating model to have better supporting code or C) get rid of the template system in favor of a custom formatter or custom StreamWriter.

Scott P

"Run for your life from any man who tells you that money is evil. That sentence is the leper's bell of an approaching looter." --Ayn Rand

Re: inserting string into string

carbon_golem29-Apr-08 3:59

carbon_golem

29-Apr-08 3:59

Also, almost forgot, You could look into constructing using XML... XSL...

"Run for your life from any man who tells you that money is evil. That sentence is the leper's bell of an approaching looter." --Ayn Rand

C# TextBox with forward slash

WaleedH29-Apr-08 2:52

WaleedH

29-Apr-08 2:52

Hello all...

when i enter a text in any WindowsForms Textbox with forward slash "/" the textbox reverse the text and make it wrong
e.g. if i enter 990 first then / then 130 the system will display it 130/990 note 990/130...
how can i solve that?

Thanks in advanced...

Thanks

Re: C# TextBox with forward slash

Bert delaVega29-Apr-08 4:00

Bert delaVega

29-Apr-08 4:00

What are you binding the textbox to?

Re: C# TextBox with forward slash [modified]

WaleedH1-May-08 1:52

WaleedH

1-May-08 1:52

Atually I'm developing a documents In-System and this is the document no.
I face this problem when I convert the textbox order to be Right To Left

Thanks

modified on Thursday, May 1, 2008 8:12 AM

The best overload method match system.IComparable has invalid arguments

ADTC#29-Apr-08 2:15

ADTC#

29-Apr-08 2:15

when i am trying to insert i the patient detail in the BINARY SEARCH TREE it give me the following error "The best overload method for IBSTree.Insert(System.Icomparable) has some invalid arguments".

<br />
//This is the interface<br />
using System;<br />
using System.Collections;<br />
<br />
<br />
    //Invariants: FirstName, LastName,StreetName and suburb sre strings of chars and<br />
    //            their length > 0 and street no > 0 and age > 0<br />
<br />
    public interface IPatient<br />
    {<br />
        //Pre: true<br />
        //Post: return the first name of the patient <br />
        string FirstName { get; set; }<br />
<br />
        //Pre: true<br />
        //Post: return the last name of the patient <br />
        //string LastName { get; set; }<br />
<br />
    }<br />
<br />
<br />
//here is the IPatient implementation<br />
using System;<br />
using System.Collections;<br />
<br />
<br />
<br />
    public class Patient: IPatient<br />
    {<br />
        private string fname;<br />
                <br />
        public string FirstName<br />
        {<br />
            get<br />
            {<br />
                return fname;<br />
            }<br />
            set<br />
            {<br />
                fname = value;<br />
            }<br />
        }<br />
        public int CompareTo(IPatient obj)<br />
        {<br />
            Patient p1 = (Patient)obj; <br />
            return fname.CompareTo(p1.fname);<br />
        } <br />
  }<br />
<br />
//trying to store the details of the patient in Binary Search Tree<br />
using System;<br />
using System.Collections;<br />
<br />
    public class BTreeNode<br />
    {<br />
        private IComparable item; // value<br />
        private BTreeNode lchild; // reference to its left child <br />
        private BTreeNode rchild; // reference to its right child<br />
<br />
        public BTreeNode(IComparable item)<br />
        {<br />
            this.item = item;<br />
            lchild = null;<br />
            rchild = null;<br />
        }<br />
<br />
        public IComparable Item<br />
        {<br />
            get { return item; }<br />
            set { item = value; }<br />
        }<br />
<br />
        public BTreeNode LChild<br />
        {<br />
            get { return lchild; }<br />
            set { lchild = value; }<br />
        }<br />
<br />
        public BTreeNode RChild<br />
        {<br />
            get { return rchild; }<br />
            set { rchild = value; }<br />
        }<br />
    }<br />
<br />
<br />
    public class BSTree : IBSTree<br />
    {<br />
        private BTreeNode root;<br />
        public BSTree()<br />
        {<br />
            root = null;<br />
        }<br />
<br />
        public bool IsEmpty()<br />
        {<br />
            return root == null;<br />
        }<br />
<br />
        public bool Search(IComparable item)<br />
        {<br />
            return Search(item, root);<br />
        }<br />
<br />
        private bool Search(IComparable item, BTreeNode r)<br />
        {<br />
            if (r != null)<br />
            {<br />
                if (item.CompareTo(r.Item) == 0)<br />
                    return true;<br />
                else<br />
                    if (item.CompareTo(r.Item) < 0)<br />
                        return Search(item, r.LChild);<br />
                    else<br />
                        return Search(item, r.RChild);<br />
            }<br />
            else<br />
                return false;<br />
        }<br />
<br />
<br />
        // pre: item != null, it might be incomplete, but must contain the key<br />
        // post: return item if item is in the binary search tree;<br />
        //	     otherwise, return null.<br />
        public IComparable PartialSearch(IComparable item)<br />
        {<br />
            return PartialSearch(item, root);<br />
        }<br />
<br />
        private IComparable PartialSearch(IComparable item, BTreeNode r)<br />
        {<br />
            if (r != null)<br />
            {<br />
                if (item.CompareTo(r.Item) == 0)<br />
                    return r.Item;<br />
                else<br />
                    if (item.CompareTo(r.Item) < 0)<br />
                        return PartialSearch(item, r.LChild);<br />
                    else<br />
                        return PartialSearch(item, r.RChild);<br />
            }<br />
            else<br />
                return null;<br />
        }<br />
<br />
<br />
        public void Insert(IComparable item)<br />
        {<br />
            if (root == null)<br />
            {<br />
                root = new BTreeNode(item);<br />
<br />
            }<br />
            else<br />
                Insert(item, root);<br />
        }<br />
<br />
        // pre: ptr != null<br />
        // post: item is inserted to the binary search tree rooted at ptr<br />
        private void Insert(IComparable item, BTreeNode ptr)<br />
        {<br />
            if (item.CompareTo(ptr.Item) < 0)<br />
            {<br />
                if (ptr.LChild == null)<br />
                {<br />
                    ptr.LChild = new BTreeNode(item);<br />
<br />
                }<br />
                else<br />
                    Insert(item, ptr.LChild);<br />
            }<br />
            else<br />
            {<br />
                if (ptr.RChild == null)<br />
                {<br />
                    ptr.RChild = new BTreeNode(item);<br />
<br />
                }<br />
                else<br />
                    Insert(item, ptr.RChild);<br />
            }<br />
        }<br />
<br />
        // there are three cases to consider:<br />
        // 1. the node to be deleted is a leaf<br />
        // 2. the node to be deleted has only one child <br />
        // 3. the node to be deleted has both left and right children<br />
        public void Delete(IComparable item)<br />
        {<br />
            // search for item and its parent<br />
            BTreeNode ptr = root; // search reference<br />
            BTreeNode parent = null; // parent of ptr<br />
            while ((ptr != null) && (item.CompareTo(ptr.Item) != 0))<br />
            {<br />
                parent = ptr;<br />
                if (item.CompareTo(ptr.Item) < 0) // move to the left child of ptr<br />
                    ptr = ptr.LChild;<br />
                else<br />
                    ptr = ptr.RChild;<br />
            }<br />
<br />
            if (ptr != null) // if the search was successful<br />
            {<br />
                // case 3: item has two children<br />
                if ((ptr.LChild != null) && (ptr.RChild != null))<br />
                {<br />
                    // find the right-most node in left subtree of ptr<br />
                    if (ptr.LChild.RChild == null) // a special case: the right subtree of ptr.LChild is empty<br />
                    {<br />
                        ptr.Item = ptr.LChild.Item;<br />
                        ptr.LChild = ptr.LChild.LChild;<br />
                    }<br />
                    else<br />
                    {<br />
                        BTreeNode p = ptr.LChild;<br />
                        BTreeNode pp = ptr; // parent of p<br />
                        while (p.RChild != null)<br />
                        {<br />
                            pp = p;<br />
                            p = p.RChild;<br />
                        }<br />
                        // copy the item at p to ptr<br />
                        ptr.Item = p.Item;<br />
                        pp.RChild = p.LChild;<br />
                    }<br />
                }<br />
                else // cases 1 & 2: item has no or only one child<br />
                {<br />
                    BTreeNode c;<br />
                    if (ptr.LChild != null)<br />
                        c = ptr.LChild;<br />
                    else<br />
                        c = ptr.RChild;<br />
<br />
                    // remove node ptr<br />
                    if (ptr == root) //need to change root<br />
                        root = c;<br />
                    else<br />
                    {<br />
                        if (ptr == parent.LChild)<br />
                            parent.LChild = c;<br />
                        else<br />
                            parent.RChild = c;<br />
                    }<br />
                }<br />
<br />
            }<br />
        }<br />
<br />
        public void PreOrderTraverse()<br />
        {<br />
            //Console.Write("PreOrder: ");<br />
            PreOrderTraverse(root);<br />
            Console.WriteLine();<br />
        }<br />
<br />
        private void PreOrderTraverse(BTreeNode root)<br />
        {<br />
            if (root != null)<br />
            {<br />
                Console.Write(root.Item);<br />
                PreOrderTraverse(root.LChild);<br />
                PreOrderTraverse(root.RChild);<br />
            }<br />
        }<br />
<br />
        public void InOrderTraverse()<br />
        {<br />
            //Console.Write("InOrder: ");<br />
            InOrderTraverse(root);<br />
            Console.WriteLine();<br />
        }<br />
<br />
        private void InOrderTraverse(BTreeNode root)<br />
        {<br />
            if (root != null)<br />
            {<br />
                InOrderTraverse(root.LChild);<br />
                Console.WriteLine(root.Item);<br />
                InOrderTraverse(root.RChild);<br />
            }<br />
        }<br />
<br />
        public void PostOrderTraverse()<br />
        {<br />
            //Console.Write("PostOrder: ");<br />
            PostOrderTraverse(root);<br />
            Console.WriteLine();<br />
        }<br />
<br />
        private void PostOrderTraverse(BTreeNode root)<br />
        {<br />
            if (root != null)<br />
            {<br />
                PostOrderTraverse(root.LChild);<br />
                PostOrderTraverse(root.RChild);<br />
                Console.Write(root.Item);<br />
            }<br />
        }<br />
<br />
        public void Clear()<br />
        {<br />
            root = null;<br />
        }<br />
<br />
        // pre: true<br />
        // post: Return all items in the collection<br />
        public ArrayList AllItems()<br />
        {<br />
            ArrayList items = new ArrayList();<br />
            AllItems(root, items);<br />
            return items;<br />
        }<br />
<br />
        private void AllItems(BTreeNode root, ArrayList keys)<br />
        {<br />
            if (root != null)<br />
            {<br />
                AllItems(root.LChild, keys);<br />
                keys.Add(root.Item);<br />
                AllItems(root.RChild, keys);<br />
            }<br />
        }<br />
}<br />
<br />
// the main method <br />
using System;<br />
using System.Collections;<br />
<br />
namespace PatientName<br />
{<br />
    class Program<br />
    {<br />
        static void Main(string[] args)<br />
        {<br />
            int choice;<br />
            IPatient p1 = new Patient();<br />
            IBSTree container = new BSTree();<br />
            Console.WriteLine("Enter the first Name of the patient:");<br />
            p1.FirstName = Console.ReadLine();<br />
            container.Insert(p1);<br />
                    <br />
        }<br />
    }<br />
}<br />
<br />
<br />

Re: The best overload method match system.IComparable has invalid arguments

Guffa29-Apr-08 2:52

Guffa

29-Apr-08 2:52

Tip: Use the pre tag when posting blocks of code. It makes it readable.

As far as I can see you only have overloads of the Insert method that takes an IComparable parameter. The Patient class doesn't implement the IComparable interface. Even if it would, the variable p1 is an IPatient reference, so it can never be used as an IComparable reference even if the actual ojbect would implement the IComparable interface.

Make the Patint class implement the IComparable interface, and change the variable p1 from an IPatient reference to a Patient reference.

Despite everything, the person most likely to be fooling you next is yourself.

I tried tht earlier and i gott this error "Patient cannot implement interface member System.IComparable.CompareTo(Object)"

ADTC#29-Apr-08 3:02

ADTC#

29-Apr-08 3:02

<pre>
//here is the IPatient implementation
using System;
using System.Collections;

public class Patient: IPatient, IComparable
{
private string fname;

public string FirstName
{
get
{
return fname;
}
set
{
fname = value;
}
}
public int CompareTo(Patient obj)
{
//Patient p1 = (Patient)obj;
return fname.CompareTo(p1.fname);
}
}

//the main method
using System;
using System.Collections;

namespace PatientName
{
class Program
{
static void Main(string[] args)
{
int choice;
Patient p1 = new Patient();
BSTree container = new BSTree();
Console.WriteLine("Enter the first Name of the patient:");
p1.FirstName = Console.ReadLine();
container.Insert(p1);

}
}
}

</pre>

Re: I tried tht earlier and i gott this error "Patient cannot implement interface member System.IComparable.CompareTo(Object)"

J a a n s29-Apr-08 3:06

J a a n s

29-Apr-08 3:06

The signature of CompareTo method will change like this

public int CompareTo(object obj){

You have to include a type checking of obj also

*jaans

yet another one cropped up

ADTC#29-Apr-08 3:14

ADTC#

29-Apr-08 3:14

And if i traverse the BST and try to output whats stored in BST it displays the Name of the ADT in my case "Patient" instead of the name of the people

Re: yet another one cropped up

J a a n s29-Apr-08 3:28

J a a n s

29-Apr-08 3:28

You are using Console.WriteLine(root.Item); for output, but

root.Item<br />

is holding an IPatient object, so its displaying the type name itself.

If you want to display the FirstName cast the object and use the suitable properties.

*jaans

Thank you

ADTC#29-Apr-08 4:30

ADTC#

29-Apr-08 4:30

Thanks a million

Re: The best overload method match system.IComparable has invalid arguments

J a a n s29-Apr-08 2:54

J a a n s

29-Apr-08 2:54

Modify your interface to implement IComparable interface

public interface IPatient:IComparable
{
//Pre: true
//Post: return the first name of the patient
string FirstName { get; set; }
//Pre: true
//Post: return the last name of the patient
//string LastName { get; set; }
}

You may have to change your implementation of Patient class also accordingly.

*jaans

Doesnot implement interface member System.IComparable.CompareTo(Object)

ADTC#29-Apr-08 3:06

ADTC#

29-Apr-08 3:06

Yes i tried the solution you gave me earlier so i was wondering if i missed out something.
i get another error:
Doesnot implement interface member System.IComparable.CompareTo(Object);

Re: Doesnot implement interface member System.IComparable.CompareTo(Object)

J a a n s29-Apr-08 3:09

J a a n s

29-Apr-08 3:09

see my comment to your earlier post.

*jaans

yet another one cropped up

ADTC#29-Apr-08 3:19

ADTC#

29-Apr-08 3:19

And if i traverse the BST and try to output whats stored in BST it displays the Name of the ADT in my case "Patient" instead of the name of the patient.

Installation

coders_need29-Apr-08 1:14

coders_need

29-Apr-08 1:14

I have 3 doubts
1. I want to install DOTNET latest version in my computer. I dont have CD for installation. Which website would you suggest to get this done.

General Doubts

2. How to create
Internet and Show Desktop symbols on status bar

3. How to include
My Computer, My Documents , Network Neighbour symbols on desktop

Re: Installation

J a a n s29-Apr-08 1:25

J a a n s

29-Apr-08 1:25

What this has to do with c#?

Anyway the answers...
1. Microsoft download site
2. On status bar of what?
3. Use desktop properties

*jaans

Re: Installation

Vikram A Punathambekar29-Apr-08 2:17

Vikram A Punathambekar

29-Apr-08 2:17

1. Google.
2. Whose status bar?
3. TweakUI.

Cheers,
Vikram.

The hands that help are holier than the lips that pray.

How to use regular expression

Exelioindia29-Apr-08 0:07

Exelioindia

29-Apr-08 0:07

Hi,

In my web application i am using a text area. How to display the & as & < as < , is there any way rather than using string.replace??

Please suggest me, if possible give me some link where i can learn.

Thanks in advance

Know is Drop, Unknown is Ocean

Re: How to use regular expression

c242329-Apr-08 0:48

c2423

29-Apr-08 0:48

You can try
& amp for ampersand (without the space)
AND
& lt for less than (without the space)
A quick way to look these up is to get a blank web page (aspx extension), type the symbols you want in "design" view, switch to "source" view and copy/paste the generated code for the symbol.

For example I put the characters onto a webpage and switched to source and got:
<form id="form1" runat="server">
<div>
&<br />
<</div>
</form>

Hope this helps
Chris

p.s. next time, this might be better in the Asp.Net forum rather then the C# forum

[Edit: My careful formatting doesnt seem to have copied very nicely so modified the post!]

Re: How to use regular expression

Exelioindia29-Apr-08 1:05

Exelioindia

29-Apr-08 1:05

Thank you very much for spending your valuable time and helping me. But i am expecting a better solution

Know is Drop, Unknown is Ocean

Re: How to use regular expression

Pete O'Hanlon29-Apr-08 0:51

Pete O'Hanlon

29-Apr-08 0:51

You can always use HttpUtility.HtmlDecode to convert your HTML text back into normal text, however you really need to think about whether this is what you want to do. The whole point of HTML encoded text is to have something that will display in a web browser, so < is not the same as < - until the point you convert it using HtmlDecode.

Deja View - the feeling that you've seen this post before.

My blog | My articles

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.