Converting Datatable To Xml Using Linq?

Apr 24, 2012

I need help converting datatable to xml using Linq. I could do it with hardcoded column names as you can see in my code .. but i need it without hardcoding it ..Example datatable ..My linq query ..

Dim xmlDoc As New XDocument(
From row In dt.AsEnumerable()
From row In dt.AsEnumerable()[code]......

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Converting DataTable To XML

May 8, 2012

I need help converting DataTable to XML. I have done it using LINQ but I can't get exactly as I have to. I made a picture so that you can easily understand. The XML needs to be in certain format like below so I can't just use dt.writexml(). Artist ID needs to auto number. Songs are groupped by Artist. Prefer a solution in Linq coz that's what I have used throughout the project but I coundn't manage to get what I want here. The columns names are known so you can use something like this in the code. row.Field(Of String)("title")[code] i also have some more code that will query first created xml and do the grouping but still having album="albumname" in the song element as attribute. And it should be just one query from datatable to xml.i hate having to query against xml again to just refomat it.[code]

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Converting DataTable To JSON?

Feb 21, 2010

I'm trying to use the JavaScriptSerializer to work with this code. However it crashes when it reaches the last line;

Dim json As New String(sr.Serialize(dt))

I get this error message;

A circular reference was detected while serializing an object of type 'System.Reflection.Module'.

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Converting From Datatable To Datagridview?

Jun 30, 2010

I am trying tomodify the following code from a datagrid to a datagridview but I'm not sure about how to do the conversion. The problem lies with theDataGrid.TableStyles.A dgv does not have that property.

Function
GetColumnHeadingText(ByVal
Column As

[code].....

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.net - Converting VB Linq To C#?

Apr 12, 2011

I'm in the process of teaching myself C# by converting an existing project and am stuck converting the following vb linq code:

Dim outStuff = From tt In (From t In Products.SelectMany(Function(p) If(p.tags IsNot Nothing, p.tags, New ObservableCollection(Of TagModel)))
Group By tagName = t.name,
v = (Aggregate p In Products Where If(p.tags IsNot Nothing, p.tags.Contains(t), Nothing) Into Sum(p.views)),
nl = (Aggregate p In Products Where If(p.tags IsNot Nothing, p.tags.Contains(t), Nothing) Into Sum(p.num_likes))

[Code]...

var x = Products.SelectMany(p => (p.tags != null) ? p.tags : new ObservableCollection<TagModel>());
var tags = from t in x group t by t.name into g select new { tagname=g.First().name};

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Converting DataTable Column Into An Array?

Nov 26, 2009

I am having some trouble with creating a simple function that converts a column of a datatable to an array (containing all numbers). Upon running it, it says "Index was outside the bounds of the array"; however, I couldn't understand why my function would create this problem.Also since I do not usually program using VB.Net, I am not sure if my function has other errors (like syntax errors).

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.net - Converting Linq To XML Query From C# To .Net?

Dec 1, 2009

I'm converting the Linq query below from C# to VB.Net. Can you spot my error? The query joins 3 XML datasets. C# - This one works great.

List<Course> courses =
(from course in CourseXML.Descendants(ns + "row")
join coursecategory in CourseCategoryXML.Descendants("Table") on (string)course.Attribute("code") equals (string)coursecategory.Element("DATA")

[code]....

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Converting LINQ Expression From C#

Nov 18, 2010

I'm having a little trouble converting some LINQ to VB.[code]Online code translators are not helping, and my unfamiliarly with VB LINQ is not very good.

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Converting Linq To C# Linq?

Feb 22, 2012

I recently switched from VB to C# and have, for the most part, been able to make the transition without too much trouble. Currently I am working on converting a VB.Net program into C# and am having trouble with a couple of code blocks that include Linq.

This is one of the VB.Net lines of code that I am having trouble with:

I have tried to do the same thing in C# like this:

I am getting a compile error on the dt, which says Could not find an implementation of the query pattern for source type 'System.Data.DataTable'.'GroupBy' not found. VS also has issues with the whole into Emailers = group;

I have tried to get this right using examples from my search but have not been able to get it right.

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Get Distinct Values And Converting Back Into DataTable?

Mar 14, 2012

I have a "result" which is DataTable and I like to get the x distinct values(City) and convert it back to DataTable how do I do this the code below gives me an error

Dim query = (From x In results.AsEnumerable()
Select (x.Field(Of String)("City"))).Distinct().CopyToDataTable()

so what I want is records of distinct cities I can get that but the problem I am having is converting it back to Datable.

Edited:I am using "where" in this statement and it does convert to Table(works fine) but not on "select"

Dim results = (From myRow In ds.Tables(1).AsEnumerable()
Where (myRow.Field(Of String)("xxxx") = xxxx)
Select myRow).Distinct().CopyToDataTable()

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Asp.net - Converting The Rows Of A Returned DataTable Object Into A Useful List?

Jun 23, 2009

I am currently writing unit tests for an application near completion (before management looks at it and turns it inside out). I am testing the business layer and a method is set to return a datatable of all "GroupID"s, which are simply an integer to represent the group that a user belongs to.

I'm assuming the best way to assert on this unit test would be to assert that the correct groupIDs are being returned from a controlled test database. However, I'm not sure how to assert on a datatable. Is the only (and best) possible way to accomplish this to simply loop through the datatable until it's empty and add each value to an array of integers? How would one go about asserting on this test?

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.net - Converting Linq To XML Result To Generic List?

Nov 22, 2009

I have a function that works great in C# that I'm converting to VB.Net. I'm having an issue converting the result set to a generic list in VB.net.

The code:

Public Function GetCategories() As List(Of Category)
Dim xmlDoc As XDocument = XDocument.Load("http://my_xml_api_url.com")
Dim categories = (From category In xmlDoc.Descendants("Table") _
Select New Category()).ToList(Of Category)()
Return categories
End Function

The error occurs when convertng the result via .ToList(Of Category)() The error:

Public Function ToList() As System.Collections.Generic.List(Of TSource)' defined in 'System.Linq.Enumerable' is not generic (or has no free type parameters) and so cannot have type arguments.

Category is a simple object I've created, stored in the App_Code directory.

I have the necessary "Imports System.Collections.Generic" reference in the file so I don't see why I can't convert the result set to a generic list.

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Converting System.Linq.IorderedEnumerable To DataView?

Oct 13, 2009

I am trying to get the DataView from a linq query expression which is querying a typed dataset. The result lands in a type of System.linq.IOrderedEnumerable. But i'm not able to convert this type to a Dataview although a few examples on the internet say that AsDataView function shoudl work but could you please throw some light on why the method AsDataView is not exposed on the query.

[Code]...

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Converting A Traditional SQL Aggregate Query Into A LINQ One - SUM Grouping ?

May 24, 2010

I'm having trouble getting my head around converting a traditional SQL aggregate query into a LINQ one. The basic data dump works like so:

Dim result =
(From i As Models.InvoiceDetail In Data.InvoiceDetails.GetAll
Join ih As Models.InvoiceHeader In Data.InvoiceHeaders.GetAll On i.InvoiceHeaderID Equals ih.ID

[CODE].....................

What I need to really be getting out is ih.Period (a value from 1 to 12) and a corresponding aggregate value for i.ExtendedValue. When I try to Group ih I get errors about i being out of scope/context.

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Group Joins With Multiple Tables Converting SQL To Linq

Mar 7, 2011

Can anyone help me by translating this SQL Statement to Linq? [code]

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Sql Server - Converting Complex Sql Stored Proc Into Linq

Jan 24, 2011

I'm using Linq to Sql and have a stored proc that won't generate a class. The stored proc draws data from multiple tables into a flat file resultset. The amount of data returned must be as small as possible, the number of round trips to the Sql Server need to be limited, and the amount of server-side processing must be limited as this is for an ASP.NET MVC project. So, I'm trying to write a Linq to Sql Query however am struggling to both replicate and limit the data returned. Here's the stored proc that I'm trying to convert:

[Code]....

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.net - Convert DataTable To Linq?

Feb 10, 2010

I'm trying to convert DataTable to Linq using

DIm result = From r in dt.AsEnumerable()
Select new ( col1 = r.Field<integer>("id"), col2 = r.Field<string>("desc"))

But i get error near 'new (' saying type expected.

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.net - Load DataTable Using Linq?

Apr 16, 2009

I found the following example on [URL] Unfortunately, I need it in VB and it's using some constructs that neither I nor the automated code converters reciognize. Anyone out there know how this should be written in VB.Net? (the problem spot is the "select new {...")

PeopleDataSet ds = new PeopleDataSet();
using (PeopleDataContext context = new PeopleDataContext())
{

[Code].....

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Datatable Grouping Using Linq?

May 25, 2011

I'm completely dense here, but I'm trying to get some stats from a DataTable. One of the columns in the datatable is called "colour".I need to find out how many of each instance of "colour" are in the datatable.

I'm trying:
Dim q = From p In PGWorkingDataTable _
Group p By p("colour") Into Group _

[code].....

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Error With LINQ To DataTable

Jan 23, 2009

Why does the following code give an error?

[Code]...

If I change the code to remove the second field, as below, then the code does not give an error.

[Code]...

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How To LINQ Datatable Update

Sep 21, 2010

discovered the compact mode of this instructions vs usual code. I found sample code for selecting, etc. from a datatable, transforming a column in a list or array - all operations are "Select"s - readonly.I need to make an simple update on a certain rows (using LINQ) from a DISCONNECTED datatable for which now I'm using this

for each dr as datarow in dtable.Rows
dr("MyField") = 77
next

[code].....

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Join Datatable Using LINQ?

Jan 13, 2011

I have two DataTables:

dt1 - personid, name

dt2 - personid

I want to create a third datatable to include records from dt1 when they are NOT in dt2 using LINQ. In this case, I can bind the third datatable to a dropdownlist.

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Linq With Datatable To Generate A CSV

Jan 21, 2011

Am new to the concept Linq.I created a var where i joined 3 tables to get the data and then bind it in a datatable and create a csv file. Now i want to use an additioanl table in the same variable to be bind with the datatable but my problem is i cant use join here since i dnt have any common col or primary col in this additional table.How do i add this extra table?

[Code]...

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Paging With Linq And DataTable?

Apr 20, 2009

I'm writing a small web app in VB.NET and I would like to do paging for my DataTable in the following function :

Public Shared Function Testing(ByVal KeyWord As String, ByVal CurrentPage As Integer, ByVal PageSize As Integer) As DataTable
Dim db As New BibleDataClassesDataContext

[code].....

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Use Linq To Return A Row In A DataTable?

Jan 24, 2012

Currently, I am using a loop to find the row I want to update.

Public Sub pubsub_SetUserDGVColumnWidth(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewColumnEventArgs)
' update all user settings for the given column

[Code]....

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Find A DataTable Row By Column Value Using LINQ?

Jan 7, 2012

I have a Dynamic DataTable Created at runtime. The Setup is like so

Id | Name | Age
-----------------
3 | Mike | 21
6 | John | 43
8 | Sara | 34

What I am trying to do is come up with a linq statement I could use to find and update specific rows.

Such as a statement to change AGE to '33' WHERE ID = '3'

My code So far is:

-[VB.NET]-
Dim MyRow As DataRow = From column In MyTable.Rows Where column("Id") = 3
MyRow(0)("Age") = 33

But this is not updating my DataTable entry.

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Perform An Aggregation On A DataTable With Linq In .net

Dec 22, 2009

I wish to output an IEnumerable type (dictionary(of T) would be perfect, otherwise a datatable would be acceptable) that provides an aggregation of the data within the datatable.In SQL I would write the query as such: select groupByColumn, sum(someNumber) from myTable group by groupByColumn

In VB.NET the closest I have got to this (achieved using information here) is: dt is a datatable containing two columns, referred to by index in p below Dim q = From p In dt Group p By p(0) Into Sum(p(1)) Select p(0), SumOfNumber = Sum

However I receive error: "Range variable name can be inferred only from a simple or qualified name with no arguments." on the p(0) element. Therefore my question is as follows:How can I resolve this error? How do I process the result (q) as an IEnumerable type? Life isn't made any easier because I'm using Linq in unfamiliar vb.net. Many examples are in C#, but I haven't really come across anything suitable even in C#.

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Use Linq To Fetch Data From Datatable?

Jul 8, 2010

i want to use linq to fetch data from datatable.I have 2 tables in Cache and i want to join these tables then get value from resultset.I pasted Original Sql query and my linq query here.My linq query returns nothing.Where do i miss?My original sql query returns 1 row,but q1 is nothing

[Code].....

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Using Linq Count Function With Datatable?

Aug 2, 2011

I write the code below. I want to make short using linq count.

Dim query0 = From obj In dtAginglist _
Where (obj.Field(Of String)("CurrentStatus") = "Open" Or obj.Field(Of String)("CurrentStatus") = "Acknowledge") _

[Code]....

I try to use code below but it dosen't work with if source is datatable.

Dim orderCounts = From c In customers New With { _
c.CustomerID, Key .OrderCount = c.Orders.Count() }

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VS 2008 - LINQ Group By Datatable

Feb 21, 2012

syntax of the LINQ query to use GROUP something BY something and select some fields of the datatable. i am having a datatable filled with some rows, i am trying to fill the datagridview with the GROUP BY query output of some fields.

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