.net - Building A LINQ Expression To Find Items Related To All Descendants Of A Tree Node?
Mar 7, 2011
I have built a database structure that represents a category tree to help classify some of the data we have stored. The implementation is that each record in the Category table has a nullable foreign key back into the Category table to represent the parent Category of this category (one-to-many), essentially allowing for subcategories within a broader parent level. There is a CategoryMembership table that links a record in the Item table to its respective Category (many-to-many). I have created the DBML for this database, and it has a member access structure that includes the following:
[Code]...
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Aug 23, 2010
i have a list of nodes (no child nodes) of movies im trying to implement a search facility by text heres a snipet i found online
Dim name As String = String.Empty
name = searchTextBox1.Text
Dim b As Boolean = True
[Code].....
my arr keeps coming in at 0. I have no idea why. I have tried messing around with different options but im coming up with nothing.
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Oct 28, 2011
1) I am begginner to dynamic Linq and having serious trouble creating expression tree after WHERE
say.: items.Category_ID=4
I tried to construct it like: Dim products = From items In mydatacontent.Products
Dim AA As ParameterExpression = Expression.Parameter(GetType(String), "items")
Dim left1 As Expression = Expression.Property(AA, GetType(String).GetProperty("Category_ID")) here is the error Dim right1 As Expression = Expression.Constant("4") Dim BB As Expression = Expression.Equal(left1, right1)
[Code]...
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Jul 26, 2010
I currently have a View in MVC where I pass a single set of data to the view. However, I've come across a problem where I am having to use a LINQ query within a For Each loop in the View to pull out additional information from a SQL View of data from another DB.
The error I'm getting is Late binding operations cannot be converted to an expression tree.
The particular snippet I'm encountering the error on is:
[Code]...
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May 23, 2012
The following LINQ query resp. call of the extension method Select in Visual Basic 2010 is working fine:
Dim qAvSalary = qJobData.Select(Function(e) e.AvSalary) But doing so I am not able to specify the name of property I want the query (e.g. AvSalary) using a string variable. This should be possible if I use a LINQ expression tree. Searching and trying a long time on how to translate the query to a corresponding expression tree was not successful. My final approach is:
[Code]...
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Jan 13, 2011
I am trying to write a simple linq query from a tutorial I read. But i cannot seem to get it to work. I am trying to display both the address in the attached xml document, but can only display the first one.
<?xml version="1.0" encoding="utf-8" ?>
<Emails>
<Email group="FooBar">
<Subject>Test subject</Subject>
<Content>Test Content</Content>
[Code] .....
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Dec 28, 2010
I have a tree view in my project with a parent node and with theoretically speaking infinite child nodes.
Now I want to delete the last child node from the tree view when the user presses a certain button. I thought I could do this trick with this code:
Private Sub Bundo_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Bundo.Click
Try
[Code]....
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Jun 28, 2010
This question is very similar to a previous question of mine, Use LINQ to count the number of combinations existing in two lists, except with some further twists.
I have a list of CartItems that can receive a discount based on the items specified in the list of DiscountItems. I need to be able to pull out the items in the Cart that can receive a discount and apply the appropriate discount specfied in the DiscountItem. The discount is only applied for each combination that exists. Here's what the two lists might look like to before the discount is applied[code]...
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Aug 7, 2009
Everything is fine except the underlined code says-'Expression is of type 'System.Environment.SpecialFolder', which is not a collection type.'
All I want to do is add the node to the treeview. Let's say that I want "My Program" to be the node in the treeview, and THAT node is a folder inside my program files, which also has a folder inside of that which is called "Projects".[code]
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Jul 14, 2011
given this function:
Public Function Search(ByVal StartIndex As Integer, _
ByVal MaxResults As Integer, _
ByVal AccountNumber As String, _
ByVal LastName As String, _
[Code]....
instead of what I expected:
Select count(*) from remitline where lastname = "smith"
What am I doing wrong building up the where clause? I'm using Castle ActiveRecord 2.1
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Aug 2, 2009
how I can add a tree node with 2 lines of text, OR how to add a non-collapsable childnode to an existing child node. Basically my treeview consist of a list of groups, and inside each group is the contacts that belong to that group. Im trying to append a line of text to the existing contact when their status changes to busy, or not available.
example
// Current Contact List //
+ MyFriends
Timmy
Frank
Bob
What happens when I try to add the child node to the existing child node is it gives me the + sign so it can be collasped! I want the child node to be visible at all times. So it looks like this
// Contact List //
+ MyFriends
Timmy
[code]....
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Apr 4, 2012
Is it possible and if so, how does one go about doing such a thing. I am loading a network directory in a treeview. Can the parent node be disabled, meaning it can't be selected, it's available for viewing only, but leave the child nodes selectable?
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Dec 21, 2009
how to rename node in an tree view?
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Nov 5, 2009
In my Form I have the Tree View in which I want to Add the Node during the Run time.
For that I used a Context Menu Strip and on the Click of the Pop menu I added the new Node.
but my problem is my newly added is not editable by default
but instead I need to select the newly added node and after selecting the node I again need to click the Record to Edit it.
So is there any way that newly added node will be added Editable?
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Nov 4, 2011
suppose i have a tree that have a root node. that root node have 3 child nodes. each child node have 3 child nodes and so on say up to level 4. if i number each node from the root node and numbering from left to right, the root node being number 1 and the left child of the root being number 2, the middle child of the root being number 3 and the right being number 3. on the third level the left child node of the left child node of the root being number 5 and so on. if i have numbers 1 up to 13 and want to put each number into a node numbered the same i.e number 1 gets into the root node, number 2 gets into the left child node of the root and so on. how would i achieve that.
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Dec 24, 2009
Well I have a Tree View With 2 Main Nodes
Offline
Online
i have a for each statement that goes thru all the nodes in the tree and checks a value BUT heres ware the issues starts I when it gets the value if depending on the value i want to move it as a child to one of the 2 parent nodes
heres the code i have
vb
Dim sep As TreeNode
For Each sep In TreeView1.Nodes
Dim conn As MySqlConnection
[Code].....
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Nov 18, 2011
Who knows, how can I expand last parent nodes in a tree view with visual basic 2010
for first node we can use TopNode but what about last node or other nodes?[code]...
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Sep 10, 2009
Here is the code that I am using in my treeview class in VB .NET 2005. I want to generate a context menu based on the current position in the tree where the user has 'right-clicked'. For this, I need to know where the user has performed a 'right-click'.
Here is the code -->
Private Sub tvHome_RightClick(ByVal sender As System.Object, ByVal e As System.Windows.Forms.MouseEventArgs)
If (e.Button = Windows.Forms.MouseButtons.Right) Then
[Code]....
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Mar 25, 2010
how can I search for a text in a tree view but by being able to tell from which level I want to start searching?
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Dec 31, 2010
I have a list of my menu strip in a table with columns
1.SlNo
2.Menu Name
3.Menu Parent No (SlNo of Parent Menuname)
I need to load this menulist from table to a tree view. As if they are in the Menu Strip. That is Sub Menus Should Come under Appropriate Main Menu upto 4 levels of sub menu i use.
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Mar 6, 2010
I created a tree view and I would like to know if (and how) I can add to a given node a datatable (displayed in a datagridview) with a click on the same node. Let me know if my question is not well described.
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Mar 28, 2009
I want to select a node from my tree view, whatever I select is going to get a record from my database, I need a unique ID in each node so it will collect the correct document relating to the selected node.
How can I do this? the name of the node maybe used more than once? Each row in my database has an ID and Title, the title is the name I guess the ID being unique needs to be tied in somehow.
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Aug 27, 2010
Basically, it refuses to find the node when the root node contains an attribute.
[code]...
When I do xml.SelectNodes("DataSet") with the xmlns in the root tag, it finds no nodes. If I remove the xmlns attribute, it works fine.How can I make it work while leaving the attribute?
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Apr 17, 2009
I have a treeview which i populate dynamically using an XML Datasource. The leaf nodes in the TreeView attempt to open a URL in an iframe within the page.This all works fine, but i would like the iframe to be hidden until the point the leaf node is selected.what event is triggered when the nodes are clicked?? I tried the SelectedNodeChanged event but this doesnt seem to get triggered!
UPDATE - The TreeView code is shown Below
<asp:TreeView ID="TreeView1" runat="server" OnSelectedNodeChanged="TreeView1_SelectedNodeChanged" DataSourceID="XmlDataSource2" AutoGenerateDataBindings="False">
<DataBindings>
[code]....
While fiddling with my code i noticed that when i remove the NavigateUrlField="URL" from my code the tree triggers the SelectedNodeChange event, But does not Trigger if NavigateUrlField="URL" is put back in.
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Jan 23, 2012
example how to create a right click on selected node in tree view..example
parentNode = mdiform
childnode1 = child form1
childnode2 = chile form2
which ever i select a different node a corresponding form will appear with a mouseup event.
i must choose first a node to view my contextmenu.
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Aug 8, 2011
I m making a "offline viewer" which uses saved webpages. I'm using a web browser and a tree-viewer. Is there a way to make the selected node in the tree viewer change if you click on a link in the web page (i.e if you select a link about The Gimp on tutorial 176, the selected node will change to The Gimp tree node)
I know about the code for changing the tree node selection, however what I'm having trouble with the web-browser side of it.
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Mar 11, 2010
I have a webbrowser control & a treeview control...once I load a website I create a HTML DOM tree representation of the website using the code below...What I want to do now, is the following:mouse over any HTML element, which will then select the corresponding tree node on the HTML DOM Tree select any tree node and have the corresponding HTML element highlight, with a red border around it?
Private Sub UpdateDOM(ByVal HTMLDocument As mshtml.IHTMLDocument3)
TreeView1.Nodes.Clear()
TreeView1.BeginUpdate()
[code].....
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Feb 3, 2009
I'm trying to programmatically select the first node loaded into a treeview.
There are 4 main branches - that each node is added to
'If ndeSelect Is Nothing Then ndeSelect = nde
Select Case cdr(1).ToString
Case "Translation"
[Code]....
I tried creating an NDESELECT object to "remember" the node - then tried the old boolean first/loop trick - but it's not remembering that SELECTEDNODE. Seems that the NDE object is just a node object - maybe not "smart" enough to know where it got loaded??
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Feb 12, 2010
I have a hashing method whose operations depend on input to the function. Profiling the program has shown that too much time is spent evaluating this hash method. I want to try changing it into an expression tree, so the inner loop checks can be done once.
Here is a simplified version of the function (I undid some obvious optimizations for the example, and took out any input validation):
Private Function Checksum(ByVal inputValues As IEnumerable(Of UInt32),
ByVal declarations As IEnumerable(Of String),
ByVal statements As IEnumerable(Of String)) As UInt32
Dim variables = New Dictionary(Of Char, UInt32)
[code]....
I want to create a function which takes the declarations and statements and outputs a specialized expression tree representing a function which takes an IEnumerable of UInt32 and returns a UInt32.Follow-Up:I succeeded, and the speed-up was ridiculous (an order of magnitude). The main things I had to learn where:Use Expression.Lambda and Expression.Compile to get a delegate you can actually use.The Expression.Block factory method has a 'variables' parameter you (essentially) use to declare locals.Expression.lambda has 'parameters'.If you call Expression.Parameter twice, you're dealing with two different variables (even if their name is the same)! Store the result for later usage. Same for labels, etc.The result of a BlockExpression is the last expression in the block.
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May 20, 2009
I am working in VB2008. I don't know what process is started when a user double clicks on a folder to display its contents. I am working on an application where I store paths to various folders in a database that is displayed in a treeview. I would like to be able to select a node in my tree and then pass the path to the associated folder to the application which can display the contents of the folder. I need to know the name of the application or process that I am trying to startup to display my folder contents.
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