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Nice one. Shows real class. You'll soon be answering questions for others
Arthur Dent - "That would explain it. All my life I've had this strange feeling that there's something big and sinister going on in the world."
Slartibartfast - "No. That's perfectly normal paranoia. Everybody in the universe gets that."
Deja View - the feeling that you've seen this post before.
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Hi I found some code in an article posted on code project "Asynchronous Method Invocation" and was trying to follow the article, and convert it to vb.net, and got stuck at the last section of the article. I was wondering if anyone out there knows what the code below does, and how to convert it to vb.net. I am most confused with the "MethodInvoker updateGrid = delegate {m_grid.Datasource = ds.Tables[0];};
Thank you
private void CallBack(IAsyncResult ar)
{
// get the dataset as output
DataSet ds = m_invokeMe.EndInvoke(ar);
// update the grid a thread safe fasion!
MethodInvoker updateGrid = delegate
{
m_grid.DataSource = ds.Tables[0];
};
if (m_grid.InvokeRequired)
m_grid.Invoke(updateGrid);
else
updateGrid();
}
eatwork
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eatwork wrote: I am most confused with the "MethodInvoker updateGrid = delegate {m_grid.Datasource = ds.Tables[0];};
Well I could try to introduce the concepts to you ......... or I could use Google to find an MSDN Article[^] .... guess which option I went with? 
led mike
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Hi led mike,
Thanks for your help. I was able to create a seperate function and delegate in place of his delegate code. Still don't understand what exactly his code does, but I got it to work some how. Thanks again
eatwork
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We have several web applications (C#, asp.net 2.0) that are very 1996 looking. We want to update the look of the applications without changing much of the functionality (for now). Is there an easy way to do this? Some good articles? Good resources? I would like to stay in Visual Studio and not use something like DreamWeaver.
Thanks, Jessica
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It really depends on how the front-ends are laid out. You can generate modern funky looking sites with CSS, so if your site isn't too table heavy I would suggest trying out CSS.
Arthur Dent - "That would explain it. All my life I've had this strange feeling that there's something big and sinister going on in the world."
Slartibartfast - "No. That's perfectly normal paranoia. Everybody in the universe gets that."
Deja View - the feeling that you've seen this post before.
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Can I send a picture of my Wife? She PRETTY! Well in my mind!
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Hello,
I've just come across the Equals() method and I'm not sure about its correct semantics. Let me clarify with an example:
<br />
public class Tester<br />
{<br />
public int a; <br />
public int b; <br />
public int c; <br />
<br />
public Tester(int a, int b, int c)<br />
{<br />
this.a = a; <br />
this.b = b; <br />
this.c = c; <br />
}<br />
<br />
public override bool Equals(object obj)<br />
{<br />
if (this.GetType() == obj.GetType())<br />
{<br />
Test test = obj as Test; <br />
<br />
if ((this.a == test.a) && (this.b == test.b))<br />
return true; <br />
else<br />
return false; <br />
}<br />
else<br />
return false; <br />
}<br />
} <br />
Two objects of class Tester shall be equal if members int a, int b are equal - independent of int c. The content is being checked, not references. May I actually do this or are there any concerns?
Thanks for your help,
Goebel
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Goebel wrote: May I actually do this or are there any concerns?
Read the discussion of "operator overloading" in Effective C++ by Scott Meyers
led mike
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The members are native data (value) types, so ((this.a == test.a) && (this.b == test.b)) will properly evaluate to a boolean expression. The runtime already knows how to test for integer equality, so the logic you present should work just fine.
A few things to keep in mind, the as operator will return null if obj is not an object of type Tester (I assume you meant Tester and not Test as you have in your example) so you should test that test is not null before using it. You really should test to make sure obj isn't null as well.
The modified method would look like this:
public override bool Equals(object obj)
{
if (obj == null)
{
return false;
}
Tester tester = obj as Tester;
if (tester == null)
{
return false;
}
if ((this.a == tester.a) && (this.b == tester.b))
{
return true;
}
else
{
return false;
}
}Also, you should also be overriding the GetHashCode(), equality, and inequality operators.
Finally, you should consider deriving your class from IEquatable<T> if you are using .NET 2.0/3.0 and implement the following functions:
public bool Equals(Tester obj)
and
public static bool Equals(Tester t1, Tester t2)
although the static method is optional but convenient
-----------------------------
In just two days, tomorrow will be yesterday.
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Thanks Scott,
exactly what I needed. You hit the nail on the head! Much appreciated.
Cheers,
Goebel
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hai friends
i want to generate word document by populationg it with the values fethed from sql server database
can u tell me thay way to do it
explore the world of imagination and be known as creative
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Ista wrote: LookupItem<t.gettype()> li = new LookupItem<t.gettype()>();
As far as I understand generics, this cannot work. Generics allow you to write code that is able to deal with unknown types in a type-safe way, but to be type-safe a concrete type has to be specified when the code is used. In your case the result of t.GetType() is unknown, so that type-safety cannot be guaranteed. I think you have to do it the none-generic way using Object or a base class.
"Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning." - Rick Cook www.troschuetz.de
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actually you can create the type via reflection to bind against.
I worked it out so it can be binded at design time and I get generic binding with abstract types.
the final resulting call was this:
LookupList<LookupItem<TopicType>> list = (LookupList<LookupItem<TopicType>>)li.Load(LookupTypes.TOPICTYPE);
So it worked and allowed me to use generics to bind, so I get type safety. The power of generics with reflection is boundless.
wow
thanks for helping.
nick
--------------------------------------------------------
1 line of code equals many bugs. So don't write any!!
My mad coder blog
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ass hole 
explore the world of imagination and be known as creative
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Does anyone have a link to .dll I can use in my .net code to edit mp3 tags.
how vital enterprise application are for proactive organizations leveraging collective synergy to think outside the box and formulate their key objectives into a win-win game plan with a quality-driven approach that focuses on empowering key players to drive-up their core competencies and increase expectations with an all-around initiative to drive up the bottom-line. But of course, that's all a "high level" overview of things
--thedailywtf 3/21/06
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Hi all... Just a quick one... I am trying to pull data from a mysql database and I am falling foul of a null data error...
I am querying a mysql database and pulling a record containing 38 items... However it is throwing errors because some of the items are null...
What is the best way to detect if the item is null? So I can do something about it...
Thanks in advance,
Phil
"Rules are for the obedience of fools and the guidance of wise men"
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Can you provide the code giving error?
Mubashir
Every job is a self portrait of the person who did it.
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Here is a bit of the code:
string mysql_query = "SELECT * FROM rt_sip WHERE id = " + id + " ORDER BY id";<br />
<br />
mysql_reader = mysql_send_query(mysql_query);<br />
<br />
while (mysql_reader.Read())<br />
{<br />
temp_id = (int)mysql_reader[0];<br />
temp_name = (string)mysql_reader[1];<br />
temp_accountcode = (string)mysql_reader[2];<br />
...<br />
...<br />
...<br />
}
Phil
"Rules are for the obedience of fools and the guidance of wise men"
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Use the IsDBNull method. Example:
if (mysql_reader.IsDBNull(1) {
temp_name = null;
} else {
temp_name = mysql_reader.GetString(1);
}
---
b { font-weight: normal; }
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Yep I tried that but got the same error message...
Will keep looking...
"Rules are for the obedience of fools and the guidance of wise men"
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Phillip Hodges wrote: Yep I tried that but got the same error message...
Then you did something wrong, because that method works.
Where exactly do you get the error message, and what exactly is the error message?
---
b { font-weight: normal; }
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Have you tried checking DBNull or IsDBNull()?
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DBValue.IsNull (or something like that)
That should be DBNull.Value
Good luck...
V.
Stop smoking so you can: enjoy longer the money you save.
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