Linq Over Datatable Using Dynamic Library Sample?

Nov 3, 2009

I am looking for sample linq code snippet which uses System.Linq.Dynamic against a datatable.

Dim entities = (From ent In dt.AsEnumerable().Where(String.Format("IsUSFederal == {0}", "true")) _
Select Description = ent("Description"), Acronym = ent("Acronym")).ToList

I am getting an error "there is no accessible Where can be called with these arguments". I have included the DynamicLinq.vb file and the application compiles fine (aside from this error). I have included Imports System.Linq.Dynamic but it doesn't appear to be working.

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LINQ Query Using The Dynamic LINQ Library?

Mar 31, 2011

Forgive my ignorance on this.I have this LINQ Query:Dim ngBikersDataContext As New CarBikeWalkDataContext

bikersList = (From c In ngBikersDataContext.Reg_Bikers _
Order By c.L_Name _
Select New Bikers() With { _
.BikerID = c.BikerID, _
.F_Name = c.F_Name, _

[Code]...

with the error "Overload resolution failed because no accesible 'Select' accepts this number of arguments."
Over the "NEW" I get an error " ')'expected."

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Usage Of Sample Code In MSDN Library?

Feb 25, 2012

When a user make a program in visual basic, for example, can he/she copy and use some of the code samples provided in the MSDN Library? Is one totally free to use such code in one's programs, and even allowed to sell software containing such sample code, or does one have to massively modify it so that it resembles little of the original.

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Finding A Sample Code For .net Dynamic Dashboard Applications?

Aug 15, 2011

I am looking for sample code for vb.net Dynamic Dashboard applications? i want the code in vb.net which will be my front end and sql will be my back end for database?

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Dynamic LINQ Query Based On Dynamic Number Of Comboboxes?

Feb 5, 2010

I would like to bind a DataGridView to a different LINQ query every time (in order to reuse the same form/DGV for different queries), like this:

[Code]....

but the "Qry", and the number of comboboxes, and their field names would change every time.

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.net - LINQ Sample: Select Typed Objects From A List

Jul 7, 2011

I have

Dim objectsList as List(Of Object) = GetAllObjects()
' Filter from Objects just Persons '
Dim peopleList as List(Of Person) = ???

What is the most efficient and effective LINQ expression to do it?

EDIT

1 Dim selectedObjects As List(Of Object) = GetAllObjects()

2 Dim selectedPeople As IEnumerable(Of Person)= selectedObjects.OfType(Of Person)

3 Dim people As List(Of Person) = selectedPeople.ToList()

Error on 3:

Value of type
'System.Collections.Generic.List(Of
System.Collections.Generic.IEnumerable(Of Person))' cannot be
converted to
'System.Collections.Generic.List(Of Person)'.

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Dynamic SQL To Dynamic LINQ In .NET With MS SQL Server 2008?

May 24, 2010

I need to represent the following query using LINQ:

DECLARE @PurchasedInventoryItemID Int = 2
DECLARE @PurchasedInventorySectionID Int = 0
DECLARE @PurchasedInventoryItem_PurchasingCategoryID Int = 3
DECLARE @PurchasedInventorySection_PurchasingCategoryID Int = 0

[code]....

Now, I know that a query in .NET doesnt look like this, this is my test in the SQL Design Studio. Naturally VB.NET variables will be used in place of the SQL local variables.My problem is this: All of the conditions after "WHERE" are optional. In that a query might be made that uses one, some, all, or none of the conditions. V.PropertyID and V.Value can also appear any number of times.In VB.NET I can make this query easy enough by simply concatenating strings, and using a loop to append the "V.PropertyID/V.Value" conditions.I can also make a Stored Procedure in MS SQL, which is easy enough.However, I want to accomplish this using LINQ.

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How To Get Lamda In LINQ To Actually Filter For Dynamic Linq

Sep 10, 2009

Example-I have a person class

Public Class Person
Private _fname As String
Public Property Fname() As String

[Code]...

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Dynamic Runtime Library Linking?

Aug 4, 2010

I have a .NET library which I know can be fairly easily linked from VS project to reference it from code. However for security reasons I want to place the DLL file in another location on the disk and reference it from code including executing methods and passing method parameters. What is the proper technique to accomplish this?

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Oci.dll Could Not Be Located In Dynamic Link Library

Jan 27, 2011

I am unsure why all of the sudden i am getting this error every time i compile and run my VB.net program running Oracle 10g. It ran fine many times but all of the sudden keeps saying this now.

[URL]

It happens on this line:

myConnection = New OleDbConnection("Provider=OraOLEDB.Oracle;Data Source=(DESCRIPTION=(ADDRESS_LIST=" & _
"(ADDRESS=(PROTOCOL=TCP)(HOST=" & dbHost & ")(PORT=" & dbPort & ")))" & _
"(CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME=" & dbServiceName & ")));" & _

[Code].....

Once it gets to the myConnection.Open() is when it displays that error box. Like i said, i used to work just fine.

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Calling VB Dynamic Link Library In VB Applications?

Jul 13, 2009

I want to calling visual basic dynamic link library in visual basic applications. I'm using visual studio 2005.net

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Dynamic Exclusive Library Runtime Linking?

Aug 4, 2010

I have a .NET library which I know can be fairly easily linked from VS project to reference it from code. However for security reasons I want to place the DLL file in another location on the disk and reference it from code including executing methods and passing method parameters.

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VS 2008 : Entry Point In Dynamic Link Library (DLL)?

Oct 23, 2010

I'm creating a project with an Add-on system, and I'm releasing an API so people can develop for my application (its called Levanta, its a basic Sub-OS, and i want people to be able to develop for it). I try to call a sample DLL i made to test out the system i created. Well, i CANT, because its not finding the functions entry point of the said function (its named initialize)...?

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What Would Cause A Dynamic Link Library To No Longer Be Found By VB Program

Apr 17, 2010

My program used to run on my system just fine until I removed some other applications. Then the proggy was giving me a runtime error. The funny thing is that once I installed visual basic 6 and added a reference to dao360.dll, or the Microsoft DAO 3.6 that the program then worked without error.

VB6 was never installed on this system before. The program worked just fine until applications were uninstalled from the system. What happened that caused the reference to stop working? Why did the program stop finding dao360.dll even though the program itself wasn't modified since vb6 wasn't installed?

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Error : Initialization Of The Dynamic Link Library C:WINNTsystem32COMCTL32.dll Failed

Jun 28, 2009

I am getting "Initialization of the dynamic link library c:WINNTsystem32COMCTL32.dll failed. The process is terminating abnormally" when I tried to install a vb package in Windows NT.

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Retrieves The Address Of An Exported Function Or Variable From The Specified Dynamic-link Library?

Jul 30, 2011

GetProcAddress Function Retrieves the address of an exported function or variable from the specified dynamic-link library (DLL).Lets say I have something like this:

Dim moduleHandle As Integer = LoadLibrary("C:myDLL.dll")
Dim methodName As String = ""
GetProcAddress(moduleHandle, methodName)
DLL should be win32 standard dll or .net dll.

How can I run the exported function if I have the address of it through GetProcAddress().If someone could supply some code it would be great.

[Code]...

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Add A New Row To An Existing Dynamic Datatable?

Sep 25, 2010

I have a dynamic datatable, created from a database. I want to add a new row (blank), so there is an option to choose nothing in a combobx. Everything works ok without adding the new row. But when I add a new row, the combobox displays nothing. What am I missing?

Here is the code
Dim DT As New DataTable
DT = DS.Tables("CallStatus")

[code].....

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Dynamic Where In Linq To SQL?

Sep 14, 2010

How would I get something like this to work so that I can dynamically alter the where-clause in this linq to sql query?

Dim AccountID = 1234
Dim AccountList
Select Case Types

[Code]....

With the above code I get this error:

Late binding operations cannot be converted to an expression tree

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Dynamic Report - Only Get A Value Which Is Datatable Type ?

Aug 15, 2009

I work on representation layer . My friend work on datalyer( back end) I only get a value which is datatable type. How can i show it to crystal report.

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Get DataTable From Dynamic Function Via Reflection?

Nov 8, 2011

I have a custom DropDownField for a GridView. I have to specify the DataSourceMethod property to the name of a function. I can not use a SqlDataConnector object. I want to take the name of the function (e.g.MyNamespace.MyClass.GetYears) and get the resulting object and assign it to a DropDownList data source.I know I will need to use the CallByName function

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VS 2008 : Add Dynamic Data To Datatable?

Oct 4, 2010

I am creating a data logger that pulls data from an existing OPC server. When the data logger is launched, I look into the OPC server and get the names of the sensors that need logging (ColumnNames() as string) . From that, I am creating a data table with columns based on the items in ColumnNames(). That part is working. What I am having problems with is adding rows to the table. When I read the values from the OPC server, I get an array of strings (values() as string) which is guaranteed to be in the same order as the ColumnNames.I have been trying to use an SqlDataAdapter with a dynamically built insert command, but it is getting extremely convoluted and ugly.Is there an way to add a data row to my table using an array of string values directly?

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.net - Dynamic Linq Query?

Mar 14, 2011

I have been trying the following but it returns unexpected results:

Dim xd As XDocument = _
<?xml version="1.0" encoding="utf-8"?>
<root>

[code].....

The above result returns both 'element' nodes however it should only return the first where element/subelement@id=1/subsubelement@id=3 However if results.Ancestors. is used it returns the correct 'subelement' and if that line is not included it returns a single 'subsubelement' whih is also correct I don't understand why when mvoing to the 'element' it returns both (I realise both have a subelement with id=1 but I thought each further query would filter out the presvious results)?

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C# - Abstracting Dynamic Linq To SQL Where

Feb 24, 2012

UPDATE: Groo's answer was marked correct as it would be a good alternative. I decided to stick with the select/switch statements to avoid the performance issues of using reflection. As far as I can tell there is no way to do what I want without using Dynamic LINQ (and reflection) or a decompiler (to manually code each LINQ statement, which I am already doing by hand). Note: to make this update DropDownList16 through DropDownList20 were removed (needed the characters).Is there a way to abstract the building of a dynamic Linq to SQL query?

I am trying to build a Linq to SQL query with a dynamic where clause, based on user supplied filters. The user needs to be able to filter strings, integers, and dates using advanced options (equal, not equal, contains, starts with, etc). The user needs to be able to use these filters with as many or few columns as desired.

[Code]...

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Dynamic Column In Linq?

Jan 5, 2010

Dim query=Form f in BBSDb.Forms order by f.FormID Descending Select f where I want the f.FormID to be able to replace with a variable..What I mean is.. it doesn't have to f.FormID .. I may want to set f.FormName to be in descending for example using the code dynamically.. Is there anyway to achive?

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Dynamic Query Linq To Xml?

Mar 16, 2011

I want to write a query that the "where" in the query is a string something like"

Dim query as string= "Name =xxxx and Date > 10 "
Dim t = from book in doc.Descendants("books") Select _
[Name] = book..value, [Date] = book..value....
Where (query)

I build the query string on run time

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Using Dynamic LINQ In Vb 2008?

Oct 17, 2011

This is an extension of my last question which was answered, so I am starting a new thread. I have a query in LINQ that I was given to trim down the columns of a datatable. This works well, however, I need to make the LINQ query dynamic. So the query below:

Dim qColumnsIWant = From row As DataRow In inDT.AsEnumerable() _
Select _
EPN = row.Field(Of Integer)("EPNID"), _
EPNID = row.Field(Of String)("EPNNumber"), _
Ingot = row.Field(Of String)("Ingot"), _
ShopOrder = row.Field(Of String)("ShopOrder")

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(Linq To Datasets) Dynamic Querying In .net?

Jan 24, 2010

I have been looking into dynamic querying of datasets and the use of copytodatatable() for a project. I have seen in alot of forums that the copytodatatable functionality is unusable as it was removed. have an example of a dynamic Linq query being loaded into a datatable.

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Asp.net - Make A Dynamic Where Clause: Linq To Sql?

Jun 28, 2011

I have the following linq query:

Dim q = From definition In definitionList _
Where definition.ValueDefName.Contains(criteria)[code]....

I have already looked into this answer: LINQ - dynamic WHERE clause?Unfortunately, it doesn't work for me using .net 4.0. When I attempt to pass the criteria string in it ask for a predicate. The end goal is to add any of these:

definition.ValueDefname.Contains(criteria)
definition.ValueDefDesc.Contains(criteria)
definition.Aliaslist.Contains(Criteria)
definition.StrategicInitiative.Contains(Criteria)

to be passed into the query depending on what checkboxes the user has selected. How can I create a dynamic where clause in linq to sql? Is there new syntax for passing in a where clause as a string?

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Building A Dynamic LINQ Query

Mar 16, 2011

I have a listbox which users can select from a list if Towns, I want to be able to build a LINQ query based on the selected items in the list e.g.

[Code]...

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C# - Linq Query With Dynamic Where Clause?

Apr 13, 2012

I'm need to do the equivalent of a t-sql statement like this using LINQ:

SELECT * FROM mytable WHERE idnumber IN('1', '2', '3')

so in LINQ I have:

Dim _Values as String = "1, 2, 3"
Dim _Query = (From m In mytable Where idnumber = _Values Select m).ToList()

Not sure what to do with _Values to make idnumber evaluate each value in the string.

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