Post New Web Links

Linq to xml get certain element value

Posted By: Posted Date: April 14, 2011 Points: 0 Category :Windows Application

Sorry for the long XML sample below. The XML sample below has two records and each record has three similar Nodes (<datafield tag="500" >) What I want to accomplish is get the value of the second Node <datafield tag = “5000”>. The fallowing code I gets the value for all three nodes but I want something like get elementat(1). Appreciate your help.

I tried this but it didn’t worked MsgBox(xEle.Elements.ElementAt(1).Value)

Code:

Dim xd As XDocument = XDocument.Load("C:\Users\stopete\Desktop\Marc_convertxml.xml")

If xd IsNot Nothing Then

Dim datafields = From datafield In xd.Descendants("datafield")

Where (datafield.Attribute("tag").Value = "500")

Select datafield

For Each xEle In datafields

View Complete Post

More Related Resource Links

Linq to xml to retrieve element value by its attribute

Can someone please tell me how to select the mac element value. Here is my code that not working. Thanks. Attempt1: '* from string Dim xdoc As XDocument = XDocument.Parse(xmlString) Dim LQElements = From xe In xdoc.Elements("mac") _ Where xe.Attribute("type").Value = "eth" _ Select xe.Value For Each LQElement In LQElements Dim mytype As String = LQElement.ToString Next Attempt2: '* from string Dim xdoc As XDocument = XDocument.Parse(xmlString) Dim LQElements = (From xe In xdoc.XPathSelectElements("//mac") _ Where xe.Attribute("type") = "eth" _ Select New With { _ .type = xe.Attribute("type").Value, _

LINQ to XML: Exclude creating an element if NULL???

I'm creating my first xml file via linq to xml however I'm encountering an issue. I need to be able to exclude a set of elements when a certain element is NULL.

My xml file contains info on customer orders. If the customer entered their phone number info, then there are several xml elements that need to be filled in (phone number, number type, phone extension, etc). If they left their phone number blank however, then the xml elements should be suppressed.

So the xml should either look like this:

---------------------------------------------------

<phone>

   <phonenumber>555-555-5555</phonenumber>

   <numbertype>mobile</numbertype>

</phone

Playing with Linq grouping: GroupByMany?

One of its features is grouping. Many people understand grouping like it is defined in Sql. Linq is implementing grouping quite the same way. Let's discover this syntax and how to make consecutive groups easier.

LINQ : Implementing IN and NOT IN

I got tried of typing

var result = from s in source
where items.Contains(s)
select s;and so I implemented the IN and NOT IN methods as extension methods:

101 LINQ Samples Tutorials

101 LINQ Example with sample code snippets....This sample prints each element of an input integer array whose value is less than 5. The sample uses a query expression to create a new sequence of integers and then iterates over each element in the sequence, printing its value

Linq: how to share parameters between lambda expressions ?

When using Linq to objects, you will quickly feel the need to pass some parameters from a method to another but it's not so easy because each Linq method is not calling the following one. In a Linq sequence, each method is using the result computed by the previous one. So, local contexts are not visible from one method to another.
The compiler is using two technical different ways to let parameters go out of a method.

Linq to Sql CompiledQuery container

Ok now let's go. Here is just a little trick but with some interesting patterns that could be useful in some other contexts not connected to Linq to Sql.

When using Linq expressions, like with Linq to Sql, translating the expression into something else (sql for example) is taking time and resources. Sometimes it's negligible, sometimes not...

LINQ to SQL Paging using GridView in C# and ASP.NET 3.5

This tutorial will show you how we can extend the LINQ to SQL Class and create methods that will allow us to page data from a SQL database. C# version.

What is Lambda Expressions In LINQ

A lambda expression is an anonymous function that can contain expressions and statements, and can be used to create delegates or expression tree types.

All lambda expressions use the lambda operator =>, which is read as "goes to". The left side of the lambda operator specifies the input parameters (if any) and the right side holds the expression or statement block. The lambda expression x => x * x is read "x goes to x times x." This expression can be assigned to a delegate type as follows:

How to create 3 tier application using LINQ

As you know that in 3 tier architecture there are three layers

User interface layer. (Is our Form in Windows application and .aspx page in Web application)
Data Access layer. (Which provides interface between Business logic layer and Database)
Business Logic layer.(Which stores your application logic)

Building a LINQ Provider

Throughout this article, we will build a simple IQueryable provider similar to the LINQ to SQL provider demonstrating what is needed to build a custom provider that is capable of executing LINQ queries and performing create, update and delete operations.

LINQ to SQL Performance Considerations

As developers we have a wide array of tools at our disposal. One of the most time consuming, but most beneficial tasks we must undertake is to determine which of those tools to use for a given situation.

Passing Linq Statement between master and content page

I usually work with windows forms, and am just starting to work with ASP.Net, so appologies if this is a dumb question!

I have a master page which has a search button on it. The results of this are built up using a Linq statement and if there are any results, I want to display the results in a contents page.

On the masterpage, I have the following code:

Private _res

    Public Overridable ReadOnly Property SearchRes()
        Get
            Return _res
        End Get
    End Property

 Private Sub DoSearch()
   'some code to get a linq result
   'then

    If res.Any Then
            _res = res
            Server.Transfer("SearchResults.aspx", True)
        Else
            'no results
            LabelNoRes.Visible = True
        End If
 End Sub

On the SearchResults.aspx page I have this code.

Dim m As pxSite = CType(Page.Master, MasterPage)
        If m.SearchRes IsNot Nothing Then
            Label1.Text = "Results found = " & m.SearchRes.Count
        End If

m.searchRes is always nothing.

What am I doing wrong here?

Thanks

UpdatePanel is not a known element - message when upgrading to 1.0 ajax

It worked on one of my old pages. I change the web.config, renamed all the <asp.

On some aspx page it doesn't recognize the updatepanel. It only does on one page. If I create a new aspx page with a different name - then it works.

Should I just create a new web project ajax - then copy all my code into there? Or is there a way to get those old pages to recognize the new ajax controls?

Linq - add data to database then email user the details

Hi all

I'm not sure how to structure the code for this but what I want to do is be able to add data to a database, and once this has completed successfully, then email the user to say the details have been added successfully to the database.

I need to:

1. Check that the relevant data has been added into the database then

2. Email the details of the relevant data when completed.

Thanks in advance for your help,

Laura

Linq qry with order by basic questions

I have never tried a group by with linq, now I do and I'm stuck.

I try to convert this sql statement to its linq counterpart :

SELECT COUNT(tb_Mailer_Smses.Id) AS [cnt], tb_Mailer_mailing.Id As [Id]
,SUM( CASE WHEN tb_Mailer_smses.DLRStatus = 200 THEN 1 ELSE 0 END) As [Delivered]
,SUM(CASE WHEN DLRStatus BETWEEN 300 AND 499 THEN 1 WHEN DLRStatus BETWEEN 800 AND 899 THEN 1 END) AS [Errors]
FROM tb_Mailer_mailing INNER JOIN
tb_Mailer_Smses ON tb_Mailer_mailing.Id = tb_Mailer_Smses.MailingId
WHERE tb_Mailer_mailing.ApplicationId = 1
GROUP BY tb_Mailer_mailing.Id

Is there some one who can me show me the convertion process ?

C#, LINQ: (List<>) Question???

Hi Everyone,

I have a strange problem:

There is an entity (Table) called "Filters" in my .edmx which has all my tables and stuff in it (to use it for LINQ queries)

I have created a class called "CustomFilters" which inherits "Filters". So now my cutom class has all the properties of the original "Filters" class (table) and 1 more additional property that i wanted which is a List of "CustomFilters":

List<CustomFilters> children = new List<CustomFilters>();

Now i get all my records into:

List<CustomFilters> theOriginalList = new List<CustomFilters>();

NOTE: first all records are tken into a List<Filters> and then these are added into List<CustomFilters> where List<CustomFilters> for children of that record is added, and then children of the child records, and so on......

so now, every record is an instance of CustomFilters which has a property named "children" which is a list again; and each child again has instanaces of "CustomFilters", and each instance again has children...and on and on and on.....

(basiacally its a data source for a treeview in my silverlight control)

every thing is good and working as expected.

but:


Categories:

ASP.Net	Windows Application	.NET Framework	C#	VB.Net	ADO.Net
Sql Server	SharePoint	Silverlight	Others	All