How To Work With Predicate And .Find Methode
Jan 4, 2010
I have no chance to simple search a property in my property list by using the ".Title" of the property. Instead of using "For each > If .Title = SearchTitle" I prefer to do it with the Predicate and ".Find" methode.
Can someone help me to find out, how to avoid using the local variable " _SearchProperty" in the example below?
Private Sub NumericUpDownFrequency_ValueChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles NumericUpDownFrequency.ValueChanged
Dim PropFrequency As F_SCANT30_DEVICES.TB.Devices.clsFscanProperty
[code]....
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Apr 16, 2010
Having a bit of trouble using the List.Find with a custom predicate i have a function that does this
[code]...
by doing it this way means i have to have a shared "currentKey" object in the class, and i know there has to be a way to pass in the values i'm interested in of CurrentKey (namely, keyname, and oldkey) ideally i'd like to call it by something like keys.Find(AddressOf FindByOldKeyAndName(Name,OldVal))however when i do this i get compiler errors.How do i call this method and pass in the values?
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Mar 26, 2012
EXCEL-VBA opens a COM-DLL that -at one place- refers to a class from a another NET-DLL. When the COM-DLL tries to initialize an object from a class (in the NET-DLL) i get an error that the methode get_ContentTypeProperties has no implementation. (--> attached file contains message).
I never created the method get_ContentTypeProperties, nor is it part of the interface i'm using. When accessing the COM-DLL via another DLL, to workaround EXCEL-VBA, it works properly.
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May 9, 2012
So I have a some code I've been using for quite a while and it has worked fine. This project is rather large so I'm using a detailed namespace and I can't get it to work.[code]...
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Jan 27, 2012
This is my problem. If I write this -
[Code]...
But I'm just out of my wit why this code, written to do the same thing is not working -
[Code]...
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Aug 20, 2010
My issue is to Find exact one Calendar object from a List Of(Calendar) by passing a particular date. I got to know about the predicate but not sure about passing parameter to it.
colorcode is List Of (Calendar) and calendar class has a property called DtmDate with which I want to compare and return the desired object. Dim a As Calendar = colourcode.Find(AddressOf New Calendar.FindByDate)
I got the predicate samples from Google and reached till now. But not sure how to pass my parameter i.e. date to it.
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Nov 25, 2011
Dim datatable_default_view As DataTable = DataTable.DefaultView.ToTable
Dim servicenumber As String = datatable_default_view.Rows.Item(e.RowIndex)("Service Number").ToString
If datatable.PrimaryKey.Length = 0 Then
Dim keys(0) As DataColumn
keys(0) = datatable.Columns("Service Number")
datatable.PrimaryKey = keys
End If
Dim datarow_edited As DataRow = datatable.Rows.Find(servicenumber)
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Jun 15, 2010
The program I work on deals primarily with C# and VB.NET, and our solution files are thuscomprised of projects comprised of both languages But, when I do a 'Find all References' on a function defined in say, VB.NET, no results appear from callsmade to thatfunction from C# I have tested this in VS 2003, VS 2005, VS 2008, and the trial version of VS 2010 Ultimate, and all share this problem Doing a search of the forums, I see this is a known problem:While I can understand the argument given as to why, I feel that leaving the terminology of 'Find all References' in place is entirely misleading and wrong. It does not 'Find all References', it only finds references in the language in which the functionwas written Perhaps the text could be revised to state its actual functionality?
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Apr 24, 2012
I've got the following to sort entities by their job position. The desired order ist defined in another array. In C# this code works:[code]However I will have to convert this to VB.net. I read the equivalent would be something like the following:[code]This does not compile, gives me "Expression expected" right after the Function(x). What am I doing wrong?
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Jul 26, 2011
I need to count the items that meet a criteria in a list(of structure) in .net 2.0. eg
Dim listcars as new list(or car)
Structure car
Dim Name as string
Dim year as integer
End structure
Now i need to count all cars with name toyota etc, how do i do it.
[URL]
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Jan 12, 2011
I am pretty confused about lambdas. What I am trying to do here is write a function that will return an object from a certain table with a certain criteria. So lets say I can write:
function GetRecord(TableName as string,Criteria as string) as object
'do the linq-stuff
end function
Now I don't care if the parameters are strings or lambdas or whatever, but the end result must be that at runtime I don't know which table and which criteria will be used. As sometimes I need to get a customer record by email and sometimes a product by id etc. If possible I would prefer returning a list of matching objects and then I would just use .firstordefault when I want 1 (such as by id...).
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Mar 1, 2012
Dim datatable_default_view As DataTable = _datatable.DefaultView.ToTable
Dim servicenumber As String = datatable_default_view.Rows.Item(e.RowIndex)("Service Number").ToString
'gets the service number of the selected row[code]....
I've put this code under the DatagridView_CellEndEdit event
The Problem: The 'data_row edited' variable doesn't get initialized when exiting the cell in edit mode using the keyboard (ie: pressing the down/up arrow).If I use the mouse it works as expected. Why is this ?
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Feb 17, 2010
After browsing the internet on how to read RDF Triples, the only things i came up with were user created libraries and so on. Some MSDN documentation on Microsoft's website confused me as well, as trying to import the Namespace shown was not possible. (Maybe it's possible just in C#? no idea).So how would someone read an RDF Triple using VB.NET? RDF is an XML format in which data is stored in triples: subject, predicate, object.
Example:
<rdf:RDF
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:dc="http://purl.org/dc/elements/1.1/">[code]....
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Jun 9, 2010
I've been using a piece of code I found that reads in joystick movement into my VB application using DirectInput. Building an executable works great, the program operates as should be, however when I publish my program for final deployment, I get the following error:
"WindowsApplication has encountered a problem and needs to close. We are sorry for the inconvenience."
Here's some of the error details:
EventType : clr20r3 P1 : windowsapplication.exe P2 : 1.0.0.0
P3 : 4c0f1ae6 P4 : microsoft.visualbasic P5 : 10.0.0.0 P6 : 4ba2183b
P7 : 88 P8 : 8 P9 : system.io.fileloadexception
And then a second error pops up shortly after:
AppName: windowsapplication.exe AppVer: 1.0.0.0 AppStamp:4c0f1ae6
ModName: kernel32.dll ModVer: 5.1.2600.5781 ModStamp:49c4f482
fDebug: 0 Offset: 00012afb
The errors only occur once I try installing the program and just before the application loads.Here's the code for the program:
Imports System
Imports System.Windows.Forms
Imports Microsoft.DirectX.DirectInput
Imports Microsoft.DirectX
[code]....
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Sep 14, 2010
I have to join two main tables, and I need to filter the results by elements in an ASP.NET web form. These filters are created on the fly so I have to use a lot of where extensions to filter the query. I want to execute the query with as optimized SQL as possible.
I am first doing a simple join between TW_Sites and TW_Investigators. Then there are two sub-tables that are involved. TW_InvestigatorToArea and TW_InvestigatorToDisease. While most of the where clauses are working fine, I have found a performance issue that won't be an issue right now, but will be an issue as the table gets bigger.
The arrays DiseaseCategories and DiseaseAreas would be the results of a CheckBoxList result.
Protected Sub LoadResults()
'Get Dictionary of Filters
Dim FilterDictionary As OrderedDictionary = Session.Item("InvestigatorFilterDictionary")
' Initialize LinqToSql
[code]....
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Sep 21, 2010
Visual Studio 2008 do not work properly in 2010 (VB.NET environment). The following scenarios worked perfectly in 2008:1) Clicking on a variable and performinFind All References on it would properly find all references across thesolution (consisting of multiple projects).Doing the same thing in 2010 seems to only check the current project and not across the entire solution. Temporary fix which sometimes work is to perform a rebuild. This action was never needed in 2008.Doing the same thing in 2010 will open the Object Browser and not put focus as it did in 2008.
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May 29, 2012
I found that when group by multiple values does not work well with VB.NET, but it works well with C# ,here are my code, is there something wrong with my VB.NET Code? Here is my VB.NET code:
[Code]...
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Feb 2, 2011
I have an application that requires data be entered, and after entering, a button is clicked to process that data. Clicking the button works just as it should--the data is processed properly. In constructing a test module, I provide a set of data values, followed by:
btnWhatever.PerformClick()
Nothing happens. I have used this syntax for years, and it has always worked flawlessly. I have triple checked everything else and isolated the problem to the failure of the PerformClick(). The PerformClick() is in a test subroutine that does nothing but fill textboxes and labels with default data, then calls the PerformClick() on the button to begin processing. Again, the button works fine, the data is entered as it should be, but the PerformClick() does not fire the click event.
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Aug 21, 2009
I have a form that works on my local Machine I created into. I have Office 2007 on this machine. I created the Form with the Excel 12 Reference. I move the Entire conetence of the Project folder to my work computer. Which has Office 2003. Do I need to recreate the form with the Excel 11 reference. I could not get the form to work on work computer. IT has a com error. I am acessing the EXE for the debug folder w/in the Bin Folder.
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Jul 25, 2010
will SQL statements that work in Compact SQL Server also work in the Express Edition of SQL Server?
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May 13, 2009
I am getting the following erro message: "Unable to cast object of type 'System.String' to type 'System.Predicate`1[System.String]'." on the line of code: If Not StrgFrag.Exists(wrd) Then I was expecting a True/False response and assumed it would work given that wrd is a String variables and StrgFrag in a List(of String). Do I need to reference the wrd variable differently? Dim StrgFrag As New List(Of String)
[Code]....
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Apr 15, 2009
I am currently using the code below within a VB.Net application to find specific text in a Word document. The text is surrounded by symbols represented by the character codes in the .Text statement. The code below is working fine. The issue now is that sometimes the desired text within a document has been marked for deletion and appears as tracked change within the document. I would like to find only the desired text that has NOT been marked for deletion. Does anyone know of a way to determine if the found text is a deletion?
[Code]...
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Nov 16, 2010
I have been trying to find the last filled column row in a sheet using this.
clast = xlapp.ActiveSheet.Cells.Find("*", SearchOrder:=XlSearchOrder.xlByColumns, SearchDirection:=XlSearchDirection.xlPrevious).Column
rlast = xlapp.ActiveSheet.Cells.Find("*", SearchOrder:=XlSearchOrder.xlByColumns, SearchDirection:=XlSearchDirection.xlPrevious).Row
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Jun 8, 2009
I've got a form - CMCConsole It pops up a dialog form for adding a new case.If the matter number in a textbox on that dialog form matches an existing cases matter number I would like to find it in the binding source of the CMCConsole form
Private Function CheckMatter(ByVal MtrNum As String) As Boolean
Dim cfIndex As Integer = CMCConsole.caseBS.Find("MatterNumber", MtrNum)
Dim cfIndex2 As Integer = CMCConsole.casefileBS.Find("MatterNumber", MtrNum)
[code]....
But it appear the filter for the CASE we were just on that is set on the binding source is keeping the FIND from seeing other cases.
caseBS.Filter = "CaseId=" & e.Node.Tag.ToString
Do I have to clear the filter in order to find a matter number in some other case??
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Oct 24, 2010
how to search xml file and display the result in list box.then export a xml file to excel in the search result
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Apr 20, 2009
how can you create find & find next (using tooltip menu) create in vb.net for datagridview value.
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Jan 7, 2012
I have a TypedDataTable called CamerasDT which has a composite Primary Key of GroupId and CameraId. I want to use TypedDataTable.Rows.Find(key as object) to return a specific row by GroupId and CameraId. I don't seem to be able to find a way to send primary key to the find function.
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Jul 21, 2010
Dim pc As PrincipalContext = New PrincipalContext(ContextType.Domain, GetPath) ADUserInfo.PasswordVaild = pc.ValidateCredentials(LoginName, Password)
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Oct 19, 2011
I'm using vb2008 with DB MSA2007 (save it to MSA2003) on Seven(7)System After I create my project I build it(make exe). then I took the file of project (application) and the DB from Debug Folder.
I tried to run this application with DB on another computer it's system is seven and MSA2007 and work very well. then I run it on pc it's system XP and MSA2003. it showed this error
Application Error THE APPLICATION FAILED TO INTIALIZE PROPERLY (0XC000135). Click on OK to terminate the application
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Dec 12, 2009
I have a rich text box with the following text in it:
word word
I am finding the endings of the word, that is, the string "rd". The following code finds the first occurance, but then fails to find the last occurance, and the variable "indexToText " changes to -1.After the first search, the debugger shows the startLocation at character position 4, so it is not past the second occurance but still will not find it.
indexToText = FrmMain.RichTextBoxPrintCtrl1.Find(searchValue, _
startLocation, eof, RichTextBoxFinds.None)
If I change the text to:
word word word
It then finds the first two occurrences and fails to find the last occurrence.No matter how many words I add, it always fails to find the last occurrence.
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