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I never even considered that might be possible! Another tool for ye olde toolbox.
Spoke before I tried it; I only got it to work as System.Array.IndexOf ( a , v )
Luc Pattyn wrote: Regex approach
What about Linq?
-- modified at 19:31 Friday 30th November, 2007
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lol nice
"I need build Skynet. Plz send code"
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Thought of this one tonight.
public enum StringsOfSomeKind { SHAPE , FID , OID } ;
StringsOfSomeKind x = System.Enum.Parse ( typeof(StringsOfSomeKind) , currentFd.Name , true ) ;
if ( x != null ) ...
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I created this operator Overoad and i get this error:
"One of the parameters of a binary operator must be the containing type"
here is the code:
public static string[] operator +(string[] a, string[] b)
{
string[] Combine;
int newStringSize = a.Length + b.Length;
int i = 0;
Combine = new string[newStringSize];
foreach (string val in a)
{
Combine[i++] = val;
}
foreach (string val in b)
{
Combine[i++] = val;
}
return Combine;
}
i don't understand the problem. it is complaining on "operator +" on the function declaration
Thanks,
Marios
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Your operator overload needs to be contained in the class of the same type.
Need a C# Consultant? I'm available.
Happiness in intelligent people is the rarest thing I know. -- Ernest Hemingway
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ooh i see,
how do i add this to the string class? and isn't string[] not a class in the first place?
Thanks,
Marios
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Well it derives from System.Array doesn't it?
By the way, I implement that method as:
public static string[]
Concat
(
string[] first
,
string[] second
)
{
string[] result = null ;
if ( ( first != null ) && ( second != null ) &&
( first.Rank == 1 ) && ( second.Rank == 1 ) )
{
result = new string [ first.Length + second.Length ] ;
first.CopyTo ( result , 0 ) ;
second.CopyTo ( result , first.Length ) ;
}
else
{
throw new System.Exception ( "Can only concatenate one-dimensional arrays" ) ;
}
return ( result ) ;
}
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AFAIK you can't do what you want, since Array class isn't yours and probably sealed.
If you insist on using the + operator I am afraid the only thing you can do is come up
with an entirely new class (myStringCollection) and implement all the properties, methods
and operators you need. Such class obviously could contain an array, an ArrayList or a
List<string> to hold the actual data.
If the + operator is not mandatory, have a look at the StringCollection class, it knows
how to accept and add string arrays.
Luc Pattyn [Forum Guidelines] [My Articles]
this months tips:
- 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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No one mentioned Extension Methods, mightn't they help here?
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PIEBALDconsult wrote: No one mentioned Extension Methods, mightn't they help here?
I haven't studied the subject and am not planning to any time soon. There still is much
to digest in 2.0
Do you expect them to be available on a sealed class (I'm still assuming Array is sealed).
Luc Pattyn [Forum Guidelines] [My Articles]
this months tips:
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- the quality and detail of your question reflects on the effectiveness of the help you are likely to get
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Luc Pattyn wrote: on a sealed class
That seems to be the point of them; they behave as if they are part of the class even though they aren't.
I don't expect to use them either, but this may be a case where they are useful. The problem being that the arrays have to be compatible.
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OK, I did read this blog page[^] and do like the idea a little.
I have some use for it, for one I did create my own LP_StringList (back in 1.0 times) which
solved the casting problem and added some methods I deemed useful. I even have an
LP_StringArray with a Concat, not as nicely implemented as yours though.
Luc Pattyn [Forum Guidelines] [My Articles]
this months tips:
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- the quality and detail of your question reflects on the effectiveness of the help you are likely to get
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Luc Pattyn wrote: not as nicely implemented as yours though.
What? That old thing?
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Hi PIEBALD,
I wrote mine in the early days of .NET when I was not yet aware of the Array.CopyTo method;
after todays rework it deals with null arguments, like so:
public static string[] Concat(string[] sa1, string[] sa2) {
int len1=0;
if (sa1!=null) len1=sa1.Length;
int len2=0;
if (sa2!=null) len2=sa2.Length;
string[] sb=new string[len1+len2];
if(sa1!=null) sa1.CopyTo(sb, 0);
if(sa2!=null) sa2.CopyTo(sb, len1);
return sb;
}
so I got rid of the for loops...
Luc Pattyn [Forum Guidelines] [My Articles]
this months tips:
- 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 PRE tags to preserve formatting when showing multi-line code snippets
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When I don't want to throw on a null argument I try to find a reasonable default (and avoid checkin' it twice).
public static string[] Concat(string[] sa1, string[] sa2)
{
if ( sa1 == null ) sa1 = new string [ 0 ] ;
if ( sa2 == null ) sa2 = new string [ 0 ] ;
string[] sb = new string [ sa1.Length + sa2.Length ] ;
sa1.CopyTo ( sb , 0 ) ;
sa2.CopyTo ( sb , sa1.Length ) ;
return sb ;
}
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No way, I am not going to create two objects that I don't need at all.
At the cost of two null tests, I'll avoid these dummy arrays and their futile Length
and CopyTo operations.
I would consider your cleaner approach on a bigger job, but in a simple leaf method
I go for minimal cycles. And if I were to need an empty array like that, I would invest
in a single static one and use it over and over.
BTW: why isn't there a ??= operator allowing sa1 ??= new string[0]; ??
Luc Pattyn [Forum Guidelines] [My Articles]
this months tips:
- 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 PRE tags to preserve formatting when showing multi-line code snippets
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Yeah, that may not be a good usage for that technique, mine of course throws an exception on null, though I may change that to yours if I ever need to allow nulls.
I suppose a static empty array might be better than what I wrote.
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Extension methods may also allow the addition of HighestSetBit to ulong, etc.
Now I'm getting excited about them!
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You are absolutely right, and since I have dozens of those nasty little bit manipulation
things, that will speed up my interest in 3.0
Luc Pattyn [Forum Guidelines] [My Articles]
this months tips:
- 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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public frmEditor(string[] ProfileToUse)
{
ProfilesTypes = ProfileToUse;
dbProfiles.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0; Data Source = G:\\CSharp\\Project.mdb;Jet OLEDB:Database Password=password1";
InitializeComponent();
}
string ProfileTypesInUse = "";
bool isUpdate = false;
private void frmEditor_Load(object sender, EventArgs e)
{
if (ProfilesTypes[0] == "ProfileID")
{
try
{
isUpdate = true;
OleDbCommand cmdGetProfileFields = new OleDbCommand("select type_id from proProfiles where profile_id= " + ProfilesTypes[1], dbProfiles);
if (dbProfiles.State == ConnectionState.Closed)
dbProfiles.Open();
string[] sep = new string[1];
sep[0] = ",";
string[] ptu = cmdGetProfileFields.ExecuteScalar().ToString().Split(sep, StringSplitOptions.RemoveEmptyEntries); //I keep getting an error "Object reference not set to an instance of an object.
for (int i = 0; i < ptu.Length; i++)
Can someone please help me with this problem??
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Are you using Visual Studio? ...Have you tried using the debugger? ...put a breakpoint on that line and when you hit F5, it should stop execution on that line....put "cmdGetProfileFields" and "sep" into your watch window and see what is returned to you....if either of those show the value of "object reference not set to an instance of an object", then you've pinpointed the cause of your exception
"I need build Skynet. Plz send code"
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It gives me ptu value null and sep value is {Dimensions:[1]} in the Watch Window. What should I do now? I need {Dimensions:[2]} for ptu
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T4AMD wrote: string[] ptu = cmdGetProfileFields.ExecuteScalar().ToString().Split(sep, StringSplitOptions.RemoveEmptyEntries);
seems like ExecuteScalar returns null.
if you want to be sure about this, split the line in two:
object obj=cmdGetProfileFields.ExecuteScalar();
string[] ptu = obj.ToString().Split(sep, StringSplitOptions.RemoveEmptyEntries);
and either add a null test, or use the debugger again.
If it is null, I can not tell you why...
Luc Pattyn [Forum Guidelines] [My Articles]
this months tips:
- 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 PRE tags to preserve formatting when showing multi-line code snippets
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I keep getting the same error when i tried your code Luc, and I think that ExecuteScalar is returning a null value
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I use the code below to remove commants from xml strings.
The C# guru wrote me: that this code is wrong
since while iterating a collection it is not allowed to remove its element.
He wrote this is .NET bug: this code sholud throw exception.
Please confirm, is this .NET bug ?
How to remove comments from xml string (fix this code)?
using System;<br />
using System.Windows.Forms;<br />
using System.Xml;<br />
<br />
public class Test<br />
{<br />
[STAThread]<br />
static void Main()<br />
{<br />
XmlDocument xDoc = new XmlDocument();<br />
xDoc.PreserveWhitespace = false;<br />
xDoc.LoadXml(xml);<br />
XmlNodeList list = xDoc.SelectNodes("//comment()");<br />
foreach (XmlNode node in list)<br />
{<br />
node.ParentNode.RemoveChild(node);<br />
}<br />
}<br />
<br />
const string xml = @"<?xml version=""1.0""><br />
<Report><!-- --></Report><br />
";<br />
<br />
}<br />
Andrus
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