C# error " not all code paths return a value" - C# Discussion Boards

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4-Aug-07 22:36

In .Net you can use System.Windows.Forms.PropertyGrid and some attributes like System.ComponentModel.Browsable , System.ComponentModel.Description System.ComponentModel.DefaultValue and System.ComponentModel.Category for more control over the behavior of the object

how ever if you don't want to use PropertyGrid you can do it by your self using the Type class with methods such as GetProperties().
then you can invoke members here is for property

<br />
<br />
Type myType=myObject.GetType();<br />
System.Reflection.PropertyInfo pi=myType.GetProperty("address");<br />
pi.SetValue(myObject,"street",null);<br />
<br />

and I remember there was a PropertyGrid in vb6.0 if you don't use .Net

I hope the post would be useful

Re: Properties Window

sniper475-Aug-07 0:31

sniper47

5-Aug-07 0:31

The objects i will work on is not visual studio objects they are different classes and different objects... and i have to get their properties at runtime these objects are not design time objects.
thank you for your interest

sniper47 Computer Engineer

Re: Properties Window

J. Dunlap5-Aug-07 8:48

J. Dunlap

5-Aug-07 8:48

Same thing applies. All you have to do is put a PropertyGrid control on your properties form, and then at runtime do:

propertyGrid1.SelectedObject=control;

...where control is the control whose properties you want to show up in the property grid. Then the user can edit the properties without any need for Visual Studio at all. Seems too good to be true, huh? But it is - try it out!

--Justin,
Microsoft MVP, C#

C# error " not all code paths return a value"

jayarajmrj4-Aug-07 19:36

jayarajmrj

4-Aug-07 19:36

The below is my code which was written in Webservices. Once I compile it , the "not all code paths return a value" error occurs.
Give the solution of it.
[WebMethod]
public string GetFile(string fileName)
{
string strGetFile = "";
try
{

SPWeb site = new SPSite(srcUrl).OpenWeb();
SPFile spFile = site.GetFile(srcUrl + "/" + fileName);
if (spFile.Length > 0)
{
byte[] fileArray = new Byte[spFile.Length];
strGetFile = System.Text.ASCIIEncoding.ASCII.GetString(fileArray);
return strGetFile;
}
return strGetFile="";
}
catch {}
}

Re: C# error " not all code paths return a value"

Hessam Jalali4-Aug-07 21:27

Re: C# error " not all code paths return a value"

4-Aug-07 21:27

your method is not void and you didn't handle the catch clause code

[WebMethod]
public string GetFile(string fileName)
{
string strGetFile = "";
try
{

.
.
.

}
return strGetFile="";
}
catch {}//catch{return null;} or catch{throw new Exception("your Exception");}
}

good luck

javajohn5-Aug-07 5:42

javajohn

5-Aug-07 5:42

The return value of your method is a string, which requires that all exit points from your method provide a value to satisfy the compiler. The following example derived from yours is marked up to show the exit points...
public string SomeMethod(string fileName)
{
string strGetFile = "";
try
{
strGetFile = "some file name";
...
return strGetFile; //==> your optional exit point
}
catch
{
strGetFile = "";
...
return strGetFile; //==> your optional exit point
}
return strGetFile; //==> the main and only required exit point
}

Another way to handle it is to use only one exit point (this makes it easier to maintain as typically multiple exit points generally result in an increase in software maintenance costs over time)...

public string SomeMethod(string fileName)
{
string strGetFile = "";
try
{
strGetFile = "some file name";
...
//ensure the string is set and simply leave the try
}
catch
{
strGetFile = ""; //or some error message
...
//ensure the string is set and simply leave the catch
}
//execution resumes here after the try/catch block
return strGetFile; //==> the main and only required exit point
}

John

masterpage

TAREQ F ABUZUHRI4-Aug-07 12:23

TAREQ F ABUZUHRI

4-Aug-07 12:23

i have 3 page

maste page
header page in side the master page
defalut page

now i want from the default page to change image in header page

how i can do this ??

Palestine

Paul Conrad4-Aug-07 12:53

Paul Conrad

4-Aug-07 12:53

See the replies in the C# Web Development forum, and don't cross post, please Smile | :)

"Real programmers just throw a bunch of 1s and 0s at the computer to see what sticks" - Pete O'Hanlon

Paul Conrad4-Aug-07 13:08

Paul Conrad

4-Aug-07 13:08

I stand corrected Blush | :O

"Real programmers just throw a bunch of 1s and 0s at the computer to see what sticks" - Pete O'Hanlon

Malcolm Smart4-Aug-07 13:09

Malcolm Smart

4-Aug-07 13:09

Cool - but how did my post disappear?

"More functions should disregard input values and just return 12. It would make life easier." - comment posted on WTF

Paul Conrad4-Aug-07 13:15

Paul Conrad

4-Aug-07 13:15

Whoa, beats me. I saw it myself earlier Suspicious | :suss:

"Real programmers just throw a bunch of 1s and 0s at the computer to see what sticks" - Pete O'Hanlon

Arraylist mystery

zuidgeest4-Aug-07 9:41

zuidgeest

4-Aug-07 9:41

Today I ran into a problem with arraylists. And I can't seem to get why it doen't work. I have made the following function as below
When I use this function using statement A: result.Add(new string[] {subResult[0], subResult[1], subResult[2]}); I get this:

sr: rupert@doomsday.nl
sr: Rupert
sr: Monkey
sr: test@test.nl
sr: bart
sr: zuidgeest
rupert@doomsday.nl
test@test.nl

when I use statement B I get this output

sr: rupert@doomsday.nl
sr: Rupert
sr: Monkey
sr: test@test.nl
sr: bart
sr: zuidgeest
test@test.nl
test@test.nl

Notice the difference in the last two lines. Somehow when I use statement B I am left with only the second rusult in my arraylist twice instead of two different results. I need statement B because I cannot predict in advance what the amount of elements in each string array will be. Annyone want to tell me what's wrong? (Not that it should matter but this is on mono)

public ArrayList Search(string baseDN, int searchScope, string filter, string[] attributes)
{
ArrayList result = new ArrayList();

if (attributes == null || attributes.Length == 0)
{
return (result);
}

LdapSearchQueue queue = connection.Search ( baseDN, searchScope, filter, attributes, false, (LdapSearchQueue) null, (LdapSearchConstraints) null);

LdapMessage message;
string[] subResult = new string[attributes.Length];

while ((message = queue.getResponse()) != null)
{

if (message is LdapSearchResult)
{
int counter = 0;
LdapEntry entry = ((LdapSearchResult) message).Entry;
LdapAttributeSet attributeSet = entry.getAttributeSet();
foreach (string attributeName in attributes)
{
LdapAttribute attribute = attributeSet.getAttribute(attributeName);
subResult[counter] = attribute.StringValue;
counter++;
//Console.WriteLine("attr: " +attribute.StringValue + counter);
}
Console.WriteLine("sr: " + subResult[0]);
Console.WriteLine("sr: " + subResult[1]);
Console.WriteLine("sr: " + subResult[2]);

// A this works
//result.Add(new string[] {subResult[0], subResult[1], subResult[2]});
// B this doens't?
result.Add(subResult);
}

}

foreach(object a in result)
{
Console.WriteLine(((string[])a)[0]);
}
return(result);

}

Re: Arraylist mystery

Guffa4-Aug-07 13:19

Guffa

4-Aug-07 13:19

That's not a mystery at all. It's a common mistake, and I believe that making it usually gives a better understanding about how objects and references work.

An ArrayList is a list of references.

With statement A you are creating a new array, and you add the reference to that array to the list. Each item in the ArrayList is a reference a separate array.

With statement B you are adding the reference in the subResult variable. As the variable never changes (only the contents of the array that it refers to), you end up with a list of references to the same single array, and that array happens to contain the last values that you put into it.

---
single minded; short sighted; long gone;

Re: Arraylist mystery

zuidgeest5-Aug-07 5:27

zuidgeest

5-Aug-07 5:27

Ok, I entertained this posibility, But then I could not figure out why this does work:

ArrayList test = new ArrayList();
int[] numbers = new int[] {7,1};
test.Add(numbers);
numbers = new int[] {8,1};
test.Add(numbers);

foreach(object a in test)
{
Console.WriteLine(((int[])a)[0]);
}

this code gives me as result an 7 and then an 8 as I would expect Confused | :confused:

.

But then I looked again and noticed the difference between this and my code is that I never create an new (string) array in my loop I just refill it. I should have noticed this an long time ago Blush | :O

. I must realy like recreating objects. Tnanks Guffa for shaking me awake

get page name

TAREQ F ABUZUHRI4-Aug-07 9:27

TAREQ F ABUZUHRI

4-Aug-07 9:27

hello

how can get pae name from URL
as this http://www.any.com/abc.aspx?ss=4

i want the result to be abc.aspx

????

Palestine

Luc Pattyn4-Aug-07 9:41

Luc Pattyn

4-Aug-07 9:41

would that be everything ending at the first question mark, and starting
after the last slash before it ?
the string class has everything you need.

Smile | :)

Luc Pattyn

try { [Search CP Articles] [Search CP Forums] [Forum Guidelines] [My Articles] }
catch { [Google] }

Urs Enzler4-Aug-07 23:19

Urs Enzler

4-Aug-07 23:19

I'd rather use the Request object and its methods to access the different parts of the URL that do it myself with string operations.

see MSDN HttpRequest class for more information.

-^-^-^-^-^-
no risk no funk

Hessam Jalali4-Aug-07 23:37

4-Aug-07 23:37

<br />
Uri mine=new Uri("http://www.any.com/abc.aspx?ss=4");<br />
string path=mine.AbsolutePath  //result would be like '/abs.aspx' just for this page<br />
<br />
//you can use string operations with string class or regex for above result or use the simpler way like the code below<br />
<br />
string name=mine.Segments[mine.Segments.Length-1]; // just give you the last part of the name <br />

TAREQ F ABUZUHRI5-Aug-07 4:58

TAREQ F ABUZUHRI

5-Aug-07 4:58

how can get the URL from asp.net page ??

Palestine

Hessam Jalali5-Aug-07 5:33