Re: System.Uri problem - C# Discussion Boards

Re: Help With a Combo Problem

8-Jun-05 13:30

Your core problem is that you're shoving a datarowview into the value, the problem really is when you set the data source. You need to tell the combo which property to use to set the value for each row. The problem has nothing to do with the event. You have a datarowview in the value, you cannot magically turn it into an int, you need to either get it out as a datarowview ( which is what it is ) and then work out where your number is or, preferably, you need to fix the code that sets the datasource, so that it does in fact contain an int as you were hoping.

In general, these 'please help me, something blows up' posts are useless, look how long it took us to get to the heart of the problem. You should learn to use your debugger. You'll get your answer a lot quicker if you post something like 'this line throws an invalid cast exception and the value in the row that I'm trying to cast is a datarowview.' A few seconds in the debugger will tell you that, and as you learn C#, that's the path you'd follow to fix the problem, by first knowing what it is.

Christian Graus - Microsoft MVP - C++

monica2k8-Jun-05 13:35

monica2k

8-Jun-05 13:35

Thanks

i will try to follow ur instructions .

monica

Performance of Abstract Methods

vylkier7-Jun-05 14:50

vylkier

7-Jun-05 14:50

I know you take a performance hit if you make your methods virtual, but do you take a similar hit when you use abstract methods

Re: Performance of Abstract Methods

S. Senthil Kumar7-Jun-05 21:31

S. Senthil Kumar

7-Jun-05 21:31

Abstract methods are also virtual, it's just that they don't have any implementation in the base class. If you look into the generated IL, you'll see that they are declared virtual (plus abstract) and that method calls are translated to callvirt, which is IL speak for calling a virtual method.

Regards
Senthil
_____________________________
My Blog | My Articles | WinMacro

System.Uri problem

Jason Manfield7-Jun-05 14:23

Jason Manfield

7-Jun-05 14:23

I have a URL that I can open in the browser, but System.Uri removes a slash when it encounters an extra http: in the URL.

Here is the URL:

http://citeseer.ist.psu.edu/rd/55811103,124,1,0.25,Download/http://citeseer.ist.psu.edu/cache/papers/cs/1473/http:zSzzSzmaui.theoinf.tu-ilmenau.dezSzforschungzSzlinkszSz..zSzdoczSzhybrid_automata.pdf/alur92hybrid.pdf

System.Uri changes the above URL to (notice that http:// after Download is changed to http:/)

http://citeseer.ist.psu.edu/rd/55811103,124,1,0.25,Download/http:/citeseer.ist.psu.edu/cache/papers/cs/1473/http:zSzzSzmaui.theoinf.tu-ilmenau.dezSzforschungzSzlinkszSz..zSzdoczSzhybrid_automata.pdf/alur92hybrid.pdf

As a result, I get NameResolution exception when making HttpWebRequest.GetResponse() calls.

Re: System.Uri problem

MoustafaS7-Jun-05 16:19

MoustafaS

7-Jun-05 16:19

It assumes that you were wrong as it may not come 2 httpS in the url,
you may resolve this by sending it as a query string ,if you own this site.

Re: System.Uri problem

MoustafaS7-Jun-05 16:22

MoustafaS

7-Jun-05 16:22

See this

http://www.google.com.vn/url?sa=U&start=1&q=http://msdn.microsoft.com/library/en-us/vbcon/html/vbtskExploringWebService.asp&e=10053[^]
In this url to the link that is mentioned here it contains
YOUR problem ,see the solution.

string replace() problem

sysmatrix7-Jun-05 13:45

sysmatrix

7-Jun-05 13:45

string aa = "\document\test";

aa = aa.Replace("\", "\\"); --- this line C# doesn't like it??

I want to replace '\' in string aa to "\\". How to do it?

Alex Korchemniy7-Jun-05 14:05

Alex Korchemniy

7-Jun-05 14:05

You have to escape your chars Roll eyes | :rolleyes:

Alex Korchemniy

Christian Graus7-Jun-05 14:06

7-Jun-05 14:06

I suspect the problem is that \d and \t are valid escape values, so you've not realised the problem. To put a \ in your string, either put two or, ( my preferred option ), use @. With @ at the start, everything is literal, the only escape is double quotes to do quotes.

string aa = "\document\test";

The value here is ocument test, where the spaces are a tab

string aa = @"\document\test";
string aa = "\\document\\test";

These both set the string as you'd expect

Christian Graus - Microsoft MVP - C++

MoustafaS7-Jun-05 14:18

MoustafaS

7-Jun-05 14:18

If you have it already and want it to be replaced now,you may use the StringBuilder class that will assure that it's been replaced.

S Sansanwal7-Jun-05 16:38

S Sansanwal

7-Jun-05 16:38

string aa = @"\document\test";

aa = aa.Replace(@"\", @"\\") ;

Sanjay Sansanwal
www.sansanwal.com

WebService SoapInclude, custom classes?

nemopeti8-Jun-05 5:00

nemopeti

8-Jun-05 5:00

<br />
string aa = @"\document\test";<br />
<br />
//than use <br />
aa = aa.Replace("\\", "\\\\");<br />
<br />
//or<br />
aa = aa.Replace(@"\", @"\\");<br />
<br />
//both output is: \\document\\test<br />
<br />

Trick:
If U want to use \ in strings U must duplicate it, or use @ before teh string.

I hope it helps.

Nemo

methodincharge7-Jun-05 13:28

methodincharge

7-Jun-05 13:28

Yeah so I created a nice little Web Service that returned a custom class called Site which has 3 strings and an int. I kept getting:

System.InvalidOperationException: There was an error generating the XML document. ---> System.InvalidOperationException: The type PortalService.Site was not expected. Use the XmlInclude or SoapInclude attribute to specify types that are not known statically.
   at System.Xml.Serialization.XmlSerializationWriter.WriteTypedPrimitive(String name, String ns, Object o, Boolean xsiType)

And I used both XmlInclude and SoapInclude to no avail. So I said screw it and created a string with a delimiter that I could parse when it returned to the client. Perfect. Except now when I call the WebService, the webpage's graphics don't load completely and at random. I suppose this perhaps attributed to the fact that I just did <% Function() %> since the basic Repeater did not suite my needs. Any suggestions?

Whats wrong with this?

Tom Wright7-Jun-05 12:35

Tom Wright

7-Jun-05 12:35

I get a compiler error that not all code paths return an error. I'm fairly new at C# so did something change from MFC to C#?

<br />
		public bool ConfirmSQLServer()<br />
		{<br />
			String SrvrName;<br />
			SQLutilz sie = new SQLutilz();<br />
<br />
			IniFile ini = new IniFile("C:\\Larimore\\Prog\\LA.CFG");<br />
			SrvrName = ini.IniReadValue("DATABASE","Server");<br />
			ResultsLst.Items.Add("Database Server: " + SrvrName, 0);<br />
			String[] SrvrLst = sie.EnumerateSQLServers();<br />
<br />
			for (int i = 0; i<SrvrLst.Length;i++)<br />
			{<br />
				MessageBox.Show(SrvrLst[i].ToString()+ " " + SrvrName.ToUpper());<br />
				if (SrvrName.ToUpper().CompareTo(SrvrLst[i].ToString())== 0)<br />
				        return true;<br />
				else<br />
					return false;<br />
			}<br />
		}<br />
<br />
<br />

Thanks

Tom Wright
tawright915@yahoo.com

eddieg767-Jun-05 13:49

eddieg76

7-Jun-05 13:49

Take your return statements out of the for loop.

Example)

bool retValue = false;<br />
for (int i = 0; i {<br />
MessageBox.Show(SrvrLst[i].ToString()+ " " + SrvrName.ToUpper());<br />
if (SrvrName.ToUpper().CompareTo(SrvrLst[i].ToString())== 0)<br />
retValue = true;<br />
break;<br />
}<br />
return retValue;

Eddie

Christian Graus7-Jun-05 14:08

7-Jun-05 14:08

C# sucks at working out that all code paths do indeed return a value, although in this case, you'll return no matter what on the first iteration.

You should set a return variable with a default value, and return it at the end, change it on the way through if need be. For example, I'd set a bool value to indicate success to false, and reset it to true only when everything had worked as expected.

Christian Graus - Microsoft MVP - C++

Robert Rohde7-Jun-05 19:38

Robert Rohde

7-Jun-05 19:38

Christian Graus wrote:
C# sucks at working out that all code paths do indeed return a value

Hmmm... I always had the feeling C# was rather clever doing this. Why exactly do you think C# 'sucks' in this point?

Dan Neely8-Jun-05 2:51

Dan Neely

8-Jun-05 2:51

An example that hit me recently was when I was trying to use an if-elseif construct to return a different result for each value of an enum type. despite having a branch with a return for each possible value c# refused to accept that it always would return a value.

Tom Wright8-Jun-05 7:26

Tom Wright

8-Jun-05 7:26

To be honest, I would think it would be more efficient to code it like I have. No memory is taken up by a BOOL in my code that you would in the earlier suggestion.

Thanks for all the help guys. Some things C# is really good at, other things it's not.

Tom Wright
tawright915@yahoo.com

Christian Graus8-Jun-05 13:33

Re: create a text file in c#

8-Jun-05 13:33

Because I've written code where all paths return a value, but they are all in an if/else situation, and the compiler has barfed.

Christian Graus - Microsoft MVP - C++

create a text file in c#

Farhad Eft7-Jun-05 12:13

Farhad Eft

7-Jun-05 12:13

hi all
anybody can help me to create a text file in c#?
thanks

Christian Graus7-Jun-05 12:27