What A Lamba Expression Is
Feb 7, 2011Can someone explain what lambda expressions are?
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Lamba Expression Cannot Be Used As Expected?
Dec 23, 2011The following code produces the compiler error "Expression expected" (Sub is underlined).
Dim lambda As Action(Of Integer) = Sub(x) Console.WriteLine(x)
Why does this not work?
Note: The corresponding C# code works:
Action<int> lambda = x => Console.WriteLine(x);
Lamba Expression To Select All Values Between Lower And Upper
Nov 19, 2010lambda - vb.net lamba expression to select all values between lower and upper values plus the next lower and upper value. I need some help with a lamda expression to get a subset of range of values. I have a lower and upper value, and getting everything between them seems easy enough, but I also need the next lower and higher value to be included. I can do each of these separately, but would like to do it in one shot if possible.
The range I need the subset from has 150 values. A small example would look like:
{8.206,8.206,8.201,8.196,8.193,8.192,8.189,8.174,8.171,8.171,8.166,8.163,8.157,8.154,8.153,8.14,8.131}
My lower value is: 8.16
My upper value is: 8.17
I need to get back: {8.171,8.171,8.166,8.163,8.157}
Include A Generic Type Parameter In A Lamba Expression (2010)?
Jun 25, 2010(Not really sure if I phrased the question correctly...) I want to create a lambda expression that would take an Object, attempt to convert it to a passed-in Type, and print to the console whether it was successful or not. At a glance, the lambda expression may seem a pretty silly way to accomplish this task, but I'd really like to know what I'm doing wrong, so I can better grow my skill set.
VS gives me a designer error about the second "T" in the expression below, telling me it isn't defined) This is where I left off:
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Delegate 'System.Threading.ThreadStart' Requires An 'AddressOf' Expression Or Lambda Expression As The Only Argument To Its Constructor?
Jan 23, 2010I got this Error. below is my code.
GenerateTheList is function.Need help
Private Sub buttGenerate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles buttGenerate.Click
Dim thread1 As New Thread(New ThreadStart(GenerateTheList))
thread1.Start()
End Sub
Code To Put In An Expression To Add Database Columns In A Row And Display It In The Expression Column
Mar 21, 2010While looking in the dataset designer for a database table I am doing in visual basic 2008 I found a line for expressions under the property menu for a specific column. I need to know the code that I would put in this expression line so that this column adds up the numbers I input into three other columns and displays that number in the column. I need it to automatically calculate this for each row in the database table.
View 13 RepliesDataColumn.Expression: How To Use A User Defined Function In Expression
Oct 12, 2010I am trying to write following expression on a datacolumn. But it results in error:Replicate('*', nLevel) + NameWhere: Replicate() is a user defined function (in a module). nLevel and Name are two other columns in same data table.
View 3 RepliesExpression Parsing Using FLEE And Custom Expression Context
Jun 12, 2012I am using Flee to build a formula builder. It works great but the only problem I'm facing is that Flee doesn't understand Generic Methods I guess. I have a function called IIf declared in the expression context I'm using. [code]How can I work around this. I mean cannot , in sense, write all possible overloads of the function of all .net primitive types. What approach should I take.
View 1 RepliesAddressOf' Expression Or Lambda Expression
Feb 22, 2009From this code
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If I put New Action(AddressOf PrivateMesage), then I get the following error: Bounds can be specified only for the top-level array when initializing an array of arrays. on the following code
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Converting Arithmetic Expression With Operators In A String To An Operable Arithmetic Expression
Feb 5, 2010I must convert string data from a CNC that is arithmetic expression to a number that I can use in a VB application that I wrote. The following is what I get out of the cnc. [18722*65536+19377]/67108864. I need to evaluate this expression in my VB ap. The format of the string is not always the same as what I have illustrated.
View 2 RepliesThe Name "The" Is Not Permitted In This Context. Valid Expression Are Constants, Constants Expression, And (in Some Contexts) Variables
May 31, 2012I am calling this function when a button is CLICKED and received the error; The name "The" is not permitted in this context. Valid expression are constants, constants expression, and (in some contexts) variables. Column names are not permitted. Unclosed quotation mark after the character string 'True)'.
The function is as follows;
Private Sub Save()
Dim conn As SqlConnection = GetDbConnection()
Dim query As String
Dim cmd As New SqlCommand
Equivalent Expression In VB For This C# Expression ?
Jun 28, 2009I would like to know the equivalent expresion in VB for this C# expression: Container.TotalRowCount > 0 ? Math.Ceiling(((double)(Container.StartRowIndex + Container.MaximumRows) / Container.MaximumRows)) : 0
View 3 Replies.net - Getting The Regex Expression?
Apr 8, 2011i have a string similar to this one:
Hi, <<
ame>> <<surname>>, this is an example << est>>.
I what a regex that match and split this string in:
"Hi, "
<<
ame>>
" "
[code]....
I tried this one: (<<*.*?>>)|(>>*.*?<<), but doesn't work.
.net Equivalent Of C# Expression?
Jan 10, 2012What is the vb.net expression of this c# expression ?
Frame.GetController<ShowNavigationItemController>().CustomShowNavigationItem += new EventHandler<CustomShowNavigationItemEventArgs>(WindowController1_CustomShowNavigationItem);
Asp.net - Use Class Name As Expression?
May 28, 2011I'm not sure if this is possible but I would like to associate a class name reference to a shared member method / property / variable. Consider:
Public Class UserParameters
Public Shared Reference As Object
Public Shared Function GetReference() As Object
[Code]....
In another part of the program I would like to simply call UserParameters and have it return Reference either by aliasing GetReference or the variable directly.
I am trying to emulate the Application, Request, or Session variable:
Session(0) = Session.Item(0)
C# - Lambda Expression: CS To .Net?
Aug 24, 2011I am dumb founded at this statement....maybe its just too many hours/days of doing C# to VB.Net conversion but i am drawing a blank on this conversion.
List<string> sColors = new List<string>(this.CustomPaletteValues.Split(','));
try {
List<Color> colors = sColors.ConvertAll<Color>(s => (Color)(new ColorConverter().ConvertFromString(s)));
What i have so far:
Dim colors As List(Of Color) = sColors.ConvertAll(Of Color)(....)
As you can see its the content of the lambda that i am hitting a brick wall with.
C# - When Are ASP Expression Builders Most Useful
Jun 16, 2009I saw an example of using Expression Builders, and creating your own Custom Expression Builder Classes here: [Url] However, I fail to see the value in using this approach. It doesn't seem much easier than programmatically setting values in your code behind. As far as I can tell, the only thing you can do with them is set properties. Maybe they would be useful for setting defaults on certain controls? Can anyone shed light on where this ASP.NET feature becomes powerful?
View 4 RepliesConvert VB6 Expression Into .Net?
Nov 29, 2011The code you posted while similar to VB6 has method and syntax that is very similar to Crystal Reports Scripting Language
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Equivalent C# Expression In .net ?
Feb 19, 2010i didn't want to trust this one to any number of online conversion websites that I often use.I don't need to convert the declarations, just the expression '(byte)((flen & 0xff00) >> 8)'in
byte[] sendFrameData = new byte[280
ushort flen
sendFrameData[7] = (byte)((flen & 0xff00) >> 8);
Expression Does Not Produce A Value
Oct 28, 2009'I am having trouble with the line "senda = suba(sendaobj, EventArgs.Empty)". [code]...
View 12 RepliesExpression Does Not Produce A Value?
Aug 25, 2009Here's the
Sub DestroyUser(ByRef Victomcheck As Integer, ByRef Victorcheck As Integer)
Dim num As Object
WriteSub("destroyuser")
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Expression Is Not A Method
May 4, 2012I don't know what I have done wrong in this code using vb 2010 express, well here it is anyway
MsgBox(10)
MsgBoxStyle.Critical()
MsgBoxStyle.OkOnly("ERROR")
I get three errors of expression is not a method
Expression Not Producing A Value
Dec 16, 2011Expression not producing a value [code]...
View 7 RepliesFor Each Expression Evaluated More Than Once?
Nov 12, 2011In the following
For Each <reference> IN <expression>is <expression> evaluated for each iteration of the loop? Specifically, if <expression> is costly to evaluate, would it be wise to evaluate it once before the For Each statement and keep the result in a local variable to use in the For Each statement?
How To Use WPF And Expression Blend
Mar 17, 2012Does anyone know any good places to learn how to use WPF and Expression blend ?
View 1 RepliesHow To Write If Not Expression
Nov 11, 2011This is ok in VB.NET: If(hash.add(Numbers[index]))However how do you write the following in VB.NET: If(!hash.add(Numbers[index]))
View 1 RepliesLeft Value Of An Expression?
Oct 18, 2010I am trying to take Left(13.123,2)But it returns an error. I also tried to convert this 13.123 into a string but there is the same error.
View 3 RepliesLinq Expression To .net?
Nov 17, 2009convert this C# code to VB, tried couple of converters and they dont work properly.
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Regular Expression In .Net?
Oct 21, 2011Regular Expression to count per words and characters in VB.Net. Here's my codes.
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Use A String As An Expression?
May 29, 2012how can I use a string ( string = "my.resources.imagename" ) as an expression? like this:
dim imageString as string = "my.resources." + name 'name will be declared and is the name of the person of who the picture in the resources is picturebox1.image = (expression from string here)
is this possible? if yes, how then? I searched all over the internet but I couldn't find it
