Hello,
How can I filter a List(Of String)?
I need to get the list elements which start with the letters contained
in the variable Text.
Thanks,
Miguel 9 2775
shapper wrote:
Hello,
How can I filter a List(Of String)?
I need to get the list elements which start with the letters contained
in the variable Text.
Thanks,
Miguel
You loop through the items in the list and check the values. There are a
lot of fancy ways of doing it, like using the FindAll method or creating
a filtering enumerator, but they all boil down to looping through all
the items.
If the list is sorted, you can use the BinarySearch method to quickly
locate the items in the list, so that you don't have to loop through the
entire list.
--
Göran Andersson
_____ http://www.guffa.com
Here's both the .net 2.0 example using the predicate delegate and the .net
3.0 example using extension methods.
List<stringmyListOfStrings = new List<string>();
myListOfStrings.Add("Hello");
myListOfStrings.Add("World");
myListOfStrings.Add("Coding");
myListOfStrings.Add("C#");
myListOfStrings.Add("Control");
// ASP.NET 3.5 - Extension Method
foreach (string word in myListOfStrings.Where(i =i.StartsWith("C")))
{
Response.Write(word + "<br/>");
}
Response.Write("<br/>");
// ASP.NET 2.0 - Using the Predicate delegate
foreach (string word in myListOfStrings.FindAll(delegate(string
thisWord) { return thisWord.StartsWith("C") ? true : false; }))
{
Response.Write(word + "<br/>");
}
Output:
Coding
C#
Control
Coding
C#
Control
HTH.
-dl
--
David R. Longnecker http://blog.tiredstudent.com
Hello,
How can I filter a List(Of String)?
I need to get the list elements which start with the letters contained
in the variable Text.
Thanks,
Miguel
Whoops, just realized you had a VB example. Here's the translation, though...
with VB, you're not gaining a lot with the Extension method.
Dim myListOfStrings As New List(Of String)()
myListOfStrings.Add("Hello")
myListOfStrings.Add("World")
myListOfStrings.Add("Coding")
myListOfStrings.Add("C#")
myListOfStrings.Add("Control")
' ASP.NET 3.5 - Extension Method
For Each word In myListOfStrings.Where(Function(thisWord) thisWord.StartsWith("C"))
Response.Write(word + "<br/>")
Next
Response.Write("<br/>")
' ASP.NET 2.0 - Using the Predicate delegate
For Each word In myListOfStrings.FindAll(Function(thisWord) thisWord.StartsWith("C"))
Response.Write(word + "<br/>")
Next
-dl
--
David R. Longnecker http://blog.tiredstudent.com
Here's both the .net 2.0 example using the predicate delegate and the
.net 3.0 example using extension methods.
List<stringmyListOfStrings = new List<string>();
myListOfStrings.Add("Hello");
myListOfStrings.Add("World");
myListOfStrings.Add("Coding");
myListOfStrings.Add("C#");
myListOfStrings.Add("Control");
// ASP.NET 3.5 - Extension Method
foreach (string word in myListOfStrings.Where(i =>
i.StartsWith("C")))
{
Response.Write(word + "<br/>");
}
Response.Write("<br/>");
// ASP.NET 2.0 - Using the Predicate delegate
foreach (string word in
myListOfStrings.FindAll(delegate(string
thisWord) { return thisWord.StartsWith("C") ? true : false; }))
{
Response.Write(word + "<br/>");
}
Output:
Coding
C#
Control
Coding
C#
Control
HTH.
-dl
--
David R. Longnecker http://blog.tiredstudent.com
>Hello,
How can I filter a List(Of String)? I need to get the list elements which start with the letters contained in the variable Text. Thanks, Miguel
On Oct 9, 7:27 pm, David R. Longnecker <dlongnec...@community.nospam>
wrote:
Here's both the .net 2.0 example using the predicate delegate and the .net
3.0 example using extension methods.
List<stringmyListOfStrings = new List<string>();
myListOfStrings.Add("Hello");
myListOfStrings.Add("World");
myListOfStrings.Add("Coding");
myListOfStrings.Add("C#");
myListOfStrings.Add("Control");
// ASP.NET 3.5 - Extension Method
foreach (string word in myListOfStrings.Where(i =i.StartsWith("C")))
{
Response.Write(word + "<br/>");
}
Response.Write("<br/>");
// ASP.NET 2.0 - Using the Predicate delegate
foreach (string word in myListOfStrings.FindAll(delegate(string
thisWord) { return thisWord.StartsWith("C") ? true : false; }))
{
Response.Write(word + "<br/>");
}
Output:
Coding
C#
Control
Coding
C#
Control
HTH.
-dl
--
David R. Longneckerhttp://blog.tiredstudent.com
Hello,
How can I filter a List(Of String)?
I need to get the list elements which start with the letters contained
in the variable Text.
Thanks,
Miguel
Hi,
I am having a few problems with your code. I use VB.NET and somehow I
am not being able to convert it.
I need to use predicated in .NET 2.0 but I also need to specify which
letter to start with:
return thisWord.StartsWith(MyFirstLetter)
Anyway, I tried to make this work in VB.NET but no lucky. Could
someone help me out?
This is really strange because I always convert between C# and VB.NET.
Thanks,
Miguel
I thought I corrected and posted some VB examples too... maybe they haven't
hit the servers yet.
Here it is in VB. I extracted it out into a variable... give this a try:
Dim firstLetter As String
firstLetter = "C"
Dim myListOfStrings As New List(Of String)()
myListOfStrings.Add("Hello")
myListOfStrings.Add("World")
myListOfStrings.Add("Coding")
myListOfStrings.Add("C#")
myListOfStrings.Add("Control")
' ASP.NET 2.0 - Using the Predicate delegate
For Each word In myListOfStrings.FindAll(Function(thisWord) thisWord.StartsWith(firstLetter))
Response.Write(word + "<br/>")
Next
HTH.
-dl
--
David R. Longnecker http://blog.tiredstudent.com
On Oct 9, 7:27 pm, David R. Longnecker <dlongnec...@community.nospam>
wrote:
>Here's both the .net 2.0 example using the predicate delegate and the .net 3.0 example using extension methods.
List<stringmyListOfStrings = new List<string>();
myListOfStrings.Add("Hello"); myListOfStrings.Add("World"); myListOfStrings.Add("Coding"); myListOfStrings.Add("C#"); myListOfStrings.Add("Control"); // ASP.NET 3.5 - Extension Method foreach (string word in myListOfStrings.Where(i => i.StartsWith("C"))) { Response.Write(word + "<br/>"); } Response.Write("<br/>");
// ASP.NET 2.0 - Using the Predicate delegate foreach (string word in myListOfStrings.FindAll(delegate(string thisWord) { return thisWord.StartsWith("C") ? true : false; })) { Response.Write(word + "<br/>"); } Output:
Coding C# Control Coding C# Control HTH.
-dl
-- David R. Longneckerhttp://blog.tiredstudent.com
>>Hello,
How can I filter a List(Of String)? I need to get the list elements which start with the letters contained in the variable Text. Thanks, Miguel
Hi,
I am having a few problems with your code. I use VB.NET and somehow I
am not being able to convert it.
I need to use predicated in .NET 2.0 but I also need to specify which
letter to start with:
return thisWord.StartsWith(MyFirstLetter)
Anyway, I tried to make this work in VB.NET but no lucky. Could
someone help me out?
This is really strange because I always convert between C# and VB.NET.
Thanks,
Miguel
On Oct 9, 8:05 pm, David R. Longnecker <dlongnec...@community.nospam>
wrote:
I thought I corrected and posted some VB examples too... maybe they haven't
hit the servers yet.
Here it is in VB. I extracted it out into a variable... give this a try:
Dim firstLetter As String
firstLetter = "C"
Dim myListOfStrings As New List(Of String)()
myListOfStrings.Add("Hello")
myListOfStrings.Add("World")
myListOfStrings.Add("Coding")
myListOfStrings.Add("C#")
myListOfStrings.Add("Control")
' ASP.NET 2.0 - Using the Predicate delegate
For Each word In myListOfStrings.FindAll(Function(thisWord) thisWord.StartsWith(firstLetter))
Response.Write(word + "<br/>")
Next
HTH.
-dl
--
David R. Longneckerhttp://blog.tiredstudent.com
On Oct 9, 7:27 pm, David R. Longnecker <dlongnec...@community.nospam>
wrote:
Here's both the .net 2.0 example using the predicate delegate and the
.net 3.0 example using extension methods.
List<stringmyListOfStrings = new List<string>();
myListOfStrings.Add("Hello");
myListOfStrings.Add("World");
myListOfStrings.Add("Coding");
myListOfStrings.Add("C#");
myListOfStrings.Add("Control");
// ASP.NET 3.5 - Extension Method
foreach (string word in myListOfStrings.Where(i =>
i.StartsWith("C")))
{
Response.Write(word + "<br/>");
}
Response.Write("<br/>");
// ASP.NET 2.0 - Using the Predicate delegate
foreach (string word in myListOfStrings.FindAll(delegate(string
thisWord) { return thisWord.StartsWith("C") ? true : false; }))
{
Response.Write(word + "<br/>");
}
Output:
Coding
C#
Control
Coding
C#
Control
HTH.
-dl
--
David R. Longneckerhttp://blog.tiredstudent.com Hello,
>How can I filter a List(Of String)? I need to get the list elements which start with the letters contained in the variable Text. Thanks, Miguel
Hi,
I am having a few problems with your code. I use VB.NET and somehow I
am not being able to convert it.
I need to use predicated in .NET 2.0 but I also need to specify which
letter to start with:
return thisWord.StartsWith(MyFirstLetter)
Anyway, I tried to make this work in VB.NET but no lucky. Could
someone help me out?
This is really strange because I always convert between C# and VB.NET.
Thanks,
Miguel
Hi,
I am getting an error in:
For Each word In myListOfStrings.FindAll(Function(thisWord)
thisWord.StartsWith(firstLetter))
on word Function. It says expression expected. I don't know why.
I was trying something like:
categories.FindAll(AddressOf FindAllByPrefix)
Where FindAllByPrefix is a function that checks if the word starts
with that prefix.
The problem is that in this case I am not able to pass the PrefixValue
to the function.
I was following this example: http://msdn2.microsoft.com/en-us/library/6sh2ey19.aspx
Any idea?
Of course I would use a simple loop but I am trying to make this work
with Predicate.
Thanks,
Miguel
Okay, apparently the issue lies in that I'm using VB9.0 targeting .NET 2.0...
or something...
According to this article, anonymous delegates are not available in VB until
2008, but he does a good job of explaining how to wrap the functionality
into a quick method. http://www.paulstovell.net/blog/inde...ual-basic-net/
-dl
--
David R. Longnecker http://blog.tiredstudent.com
On Oct 9, 8:05 pm, David R. Longnecker <dlongnec...@community.nospam>
wrote:
>I thought I corrected and posted some VB examples too... maybe they haven't hit the servers yet.
Here it is in VB. I extracted it out into a variable... give this a try:
Dim firstLetter As String firstLetter = "C" Dim myListOfStrings As New List(Of String)() myListOfStrings.Add("Hello") myListOfStrings.Add("World") myListOfStrings.Add("Coding") myListOfStrings.Add("C#") myListOfStrings.Add("Control") ' ASP.NET 2.0 - Using the Predicate delegate For Each word In myListOfStrings.FindAll(Function(thisWord) thisWord.StartsWith(firstLetter)) Response.Write(word + "<br/>") Next HTH.
-dl
-- David R. Longneckerhttp://blog.tiredstudent.com
>>On Oct 9, 7:27 pm, David R. Longnecker <dlongnec...@community.nospamwrote:
Here's both the .net 2.0 example using the predicate delegate and the .net 3.0 example using extension methods.
List<stringmyListOfStrings = new List<string>();
myListOfStrings.Add("Hello"); myListOfStrings.Add("World"); myListOfStrings.Add("Coding"); myListOfStrings.Add("C#"); myListOfStrings.Add("Control"); // ASP.NET 3.5 - Extension Method foreach (string word in myListOfStrings.Where(i => i.StartsWith("C"))) { Response.Write(word + "<br/>"); } Response.Write("<br/>"); // ASP.NET 2.0 - Using the Predicate delegate foreach (string word in myListOfStrings.FindAll(delegate(string thisWord) { return thisWord.StartsWith("C") ? true : false; })) { Response.Write(word + "<br/>"); } Output: Coding C# Control Coding C# Control HTH. -dl
-- David R. Longneckerhttp://blog.tiredstudent.com Hello, > How can I filter a List(Of String)? I need to get the list elements which start with the letters contained in the variable Text. Thanks, Miguel Hi,
I am having a few problems with your code. I use VB.NET and somehow I am not being able to convert it.
I need to use predicated in .NET 2.0 but I also need to specify which letter to start with: return thisWord.StartsWith(MyFirstLetter) Anyway, I tried to make this work in VB.NET but no lucky. Could someone help me out? This is really strange because I always convert between C# and VB.NET.
Thanks, Miguel
Hi,
I am getting an error in:
For Each word In myListOfStrings.FindAll(Function(thisWord)
thisWord.StartsWith(firstLetter))
on word Function. It says expression expected. I don't know why.
I was trying something like:
categories.FindAll(AddressOf FindAllByPrefix)
Where FindAllByPrefix is a function that checks if the word starts
with that prefix.
The problem is that in this case I am not able to pass the PrefixValue
to the function.
I was following this example: http://msdn2.microsoft.com/en-us/library/6sh2ey19.aspx
Any idea?
Of course I would use a simple loop but I am trying to make this work
with Predicate.
Thanks,
Miguel
On Oct 9, 8:50 pm, David R. Longnecker <dlongnec...@community.nospam>
wrote:
Okay, apparently the issue lies in that I'm using VB9.0 targeting .NET 2.0...
or something...
According to this article, anonymous delegates are not available in VB until
2008, but he does a good job of explaining how to wrap the functionality
into a quick method.
http://www.paulstovell.net/blog/inde...ous-methods-in...
-dl
--
David R. Longneckerhttp://blog.tiredstudent.com
On Oct 9, 8:05 pm, David R. Longnecker <dlongnec...@community.nospam>
wrote:
I thought I corrected and posted some VB examples too... maybe they
haven't hit the servers yet.
Here it is in VB. I extracted it out into a variable... give this a
try:
Dim firstLetter As String
firstLetter = "C"
Dim myListOfStrings As New List(Of String)()
myListOfStrings.Add("Hello")
myListOfStrings.Add("World")
myListOfStrings.Add("Coding")
myListOfStrings.Add("C#")
myListOfStrings.Add("Control")
' ASP.NET 2.0 - Using the Predicate delegate
For Each word In myListOfStrings.FindAll(Function(thisWord)
thisWord.StartsWith(firstLetter))
Response.Write(word + "<br/>")
Next
HTH.
-dl
--
David R. Longneckerhttp://blog.tiredstudent.com On Oct 9, 7:27 pm, David R. Longnecker <dlongnec...@community.nospamwrote:
>>Here's both the .net 2.0 example using the predicate delegate and the .net 3.0 example using extension methods.
>>List<stringmyListOfStrings = new List<string>();
>>myListOfStrings.Add("Hello"); myListOfStrings.Add("World"); myListOfStrings.Add("Coding"); myListOfStrings.Add("C#"); myListOfStrings.Add("Control"); // ASP.NET 3.5 - Extension Method foreach (string word in myListOfStrings.Where(i => i.StartsWith("C"))) { Response.Write(word + "<br/>"); } Response.Write("<br/>"); // ASP.NET 2.0 - Using the Predicate delegate foreach (string word in myListOfStrings.FindAll(delegate(string thisWord) { return thisWord.StartsWith("C") ? true : false; })) { Response.Write(word + "<br/>"); } Output: Coding C# Control Coding C# Control HTH. -dl
>>-- David R. Longneckerhttp://blog.tiredstudent.com Hello,
>>>How can I filter a List(Of String)? I need to get the list elements which start with the letters contained in the variable Text. Thanks, Miguel Hi,
>I am having a few problems with your code. I use VB.NET and somehow I am not being able to convert it.
>I need to use predicated in .NET 2.0 but I also need to specify which letter to start with: return thisWord.StartsWith(MyFirstLetter) Anyway, I tried to make this work in VB.NET but no lucky. Could someone help me out? This is really strange because I always convert between C# and VB.NET.
>Thanks, Miguel
Hi,
I am getting an error in:
For Each word In myListOfStrings.FindAll(Function(thisWord)
thisWord.StartsWith(firstLetter))
on word Function. It says expression expected. I don't know why.
I was trying something like:
categories.FindAll(AddressOf FindAllByPrefix)
Where FindAllByPrefix is a function that checks if the word starts
with that prefix.
The problem is that in this case I am not able to pass the PrefixValue
to the function.
I was following this example: http://msdn2.microsoft.com/en-us/library/6sh2ey19.aspx
Any idea?
Of course I would use a simple loop but I am trying to make this work
with Predicate.
Thanks,
Miguel
Great article. I was looking Goggling but I couldn't find anything
like that.
Thanks!
Miguel
check out http://coders-lab.dnn-portal.com/Def...px?tabid=16942
for alot of options in generics.
Since you don't have anonymous delegates in vbnet, you might use the
article, so see how you do static ones for filtering (and/or sorting)
"shapper" <md*****@gmail.comwrote in message
news:11*********************@k79g2000hse.googlegro ups.com...
Hello,
How can I filter a List(Of String)?
I need to get the list elements which start with the letters contained
in the variable Text.
Thanks,
Miguel This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics
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