Compare LINQ-to-Entity To Date Results In Error?

Mar 14, 2011

I have a simple If..Then like so:

If rhcexists.First.SignatureDate > Date.Today.AddMonths(-6) Then
End If
rhcexists is a simple query to the Entity Model:

[code].....

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Update One Entity Based On Results Of Another LINQ-to-Entities Query

Apr 9, 2011

I have the following LINQ-to-Entities query:[code]This will give me all the resident assignments for the current year/term. Then I have this LINQ-to-Entities query:[code]This will give me all the rooms. I want to iterate through the assignments and based on what room is assigned update the occupancy in reset_occupancy. I'm not 100% sure how to accomplish this. Here is my pseudo code of what I want to accomplish:[code]

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Update One Entity Based On Results Of Another LINQ-to-Entities Query?

Dec 15, 2009

I have the following LINQ-to-Entities query:

' Get all the residency assignments that match the term/year.
Dim assignments = From p In dbContext.Residents _
Where p.semester = term _

[code].....

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Asp.net - Avoid Error When No Results From Entity Query?

Mar 14, 2011

I have a simple Entity query:

Dim rhcexists = From p In dbContracts.Signatures _
Where p.StudentID = people_code_id _
And p.ContractType = "rhc" _
Order By p.ID Descending _
Select p

I then check whether one of the result values is more recent than six months ago using an if..then like so:

If rhcexists.First.SignatureDate > Date.Today.AddMonths(-6) Then End If

However, if there are no results returned this will return an error. Is there a way for me to tell it to act as if the date is older than six months if there is no value at all? e.g., could I in pseudo do something like:

If Exists(rhcexists.First.SignatureDate, Date.Today.AddMonths(-8)) > Date.Today.AddMonths(-6) Then End If

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Asp.net - Linq Group By An Entity And Then Order By The Grouped (nullable) Entity

Jul 27, 2011

I am trying to build a survey engine from an existing database design which is like this.

[Code]...

The line Order By Key.RecordOrder throws a null reference exception and I can understand why. Can someone advise on how to resolve this by just modifying this one query? I am fairly new to LINQ and the necessity to write this project

[Code]...

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C# - SQL / Entity Framework Error On Date Range Query

Apr 29, 2012

I'm receiving an error when trying to query a range of dates from a MS SQL DB in MVC Entity Framework. Unable to cast the type 'System.Boolean' to type 'System.Data.SqlTypes.SqlBoolean'. LINQ to Entities only supports casting Entity Data Model primitive types. This is our query:

[Code]...

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Asp.net - Single Quote In LINQ Results Causing Error

Jul 14, 2011

I have the following LINQ query:

Dim find_id = From p In dbContext.Residents _
Where p.person_name = occupant _
Select p

I then pull the first returned ID like so:

Dim building_id As String = find_building_id.FirstOrDefault.id

This works fine, except with the person has a ' in their last name, like M'arta. In this case I get a NullReferenceException.

Okay, the problem appears to be that when I am capturing the name initially from a GridView it is inserting into the value a #39 instead of ' and then LINQ is keeping things correct, so I end up with a non-match since it is attempting to match:

M#38arta = M'arta

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Invoke A Stored Procedure With LINQ Results In Error?

Apr 2, 2010

My application produces this error System.Data.SqlClient.SqlException: Login failed for user..This started after I added a stored proc in my dbml file. It works fine in my local enviroment, but throws that error when deploy to staging sever. the user it displays is foreign to me?

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Query To Compare Date From Two Tables, Syntax Error (mission Operator)?

Mar 11, 2010

My approach is to setup three different queries and save to three different variables and then save the data in the three variables into the new table. I have the new table setup in ms access.As you can see from my code, I had tried many different ways to generate my sql statement but none of them works. Now I am trying to figure out which part of the sql statement goes wrong by testing one by one. The two that is uncomment:

1)Dim SDFH As String = "SELECT SegmentCode FROM SegmentPlantTable WHERE DatePlanted < cdate('" & Date.Today & "')"
2)Dim SDFP As String = "SELECT SegmentCode FROM HarvestTable WHERE DateOfHarvest <

[code].....

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Compare Date - Compare Textbox1 And Textbox2 Text

Mar 3, 2010

I have two textbox in my application.

Textbox1.Text="19-Jan-2010"

Textbox2.Text="Jan 2010"

May I know how can I compare that Textbox1 and Textbox2 text is within same month and same year?

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How To Bind Entity Data Source To Results Of Query

Oct 10, 2010

I have a query that will go away an and find data
Dim HSNs As String = String.Join(",", ListOfHSNs.Cast(Of String)().ToArray())
Dim query As String = "SELECT VALUE O FROM v_BillData AS O WHERE O.HSNumber IN {'" & HSNs & "'}"
Dim hs As New ObjectQuery(Of v_BillData)(query, CType(Session("ObjectCon"), ObjectContext))
What I now wish to do is to use the results of this query to databind to a EntityDataSource?

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VS 2010 - How To Replace Html Entity Code Numbers In Source Results

Sep 6, 2010

how to replace the html code numbers with the correct ones? i would show you example of html output, but vbforum automatically converts the characters so no point. i wish the replace all the & #40; (without the space) and so on with their correct replacement eg, ( in this case. also would like a short way to do this as i will be using this multiple times. so basically i would like the source to be exactly as it would if you viewed source in firefox browser, not with all the special chars unformatted like visual studio does.

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Compare The Modify Date Of A File Vs The Current System Date?

Oct 22, 2008

I'm trying to compare the modify date of a file vs the current system date. I've found an MSDN article describing how to get the modify time of a file:

Dim infoReader As System.IO.FileInfo
infoReader = My.Computer.FileSystem.GetFileInfo("C: estfile.txt")
MsgBox("File was last modified on " & infoReader.LastWriteTime)

This gest the Date and Time, but I want just the Date not the time.

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Dateinterval With Work Day - Compare The Date That Is Entered With Today's Date

Jun 6, 2011

I need to compare the date that is entered with today's date minus some number of work days.

I used dateinterval.day, but that is the actual day, not the work day. i don't see a "simple" way to get work days.

For example, my number is 3, so i want 3 work days (M-F) not 3 days.

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Excel To Check The Date Value In A Cell And Compare It To Current Date?

Oct 18, 2009

how can I create following thing with Visual basic?I would like my excel to check the date value in a cell and compare it to current date and if the value in the cell is older than 2 months compared to current date it would change the cell's colour.

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WPF With Entity Framework Or Linq?

Feb 8, 2011

I have some basic expirience in Visual Basic and programming Windows Forms programs. I know now that forms programs are no longer updated by Microsoft and that WPF is the way to go. No to mention the slicker interface you can create. I've also noticed that passing SQL strings to a database is no longer the standard either. It's either Entity Framwork or Linq.

So I am going for a fresh approach. I need to develop a program that will access a sql database and be accessed by about 10 concurrent users within the office. What's the best approach in general? Linq or Entity Framework? Also, could you recommend a book or two for someone who is new to WPF and Entity Framework? I do have some programming expirience, just none with WPF or the new ways of ADO.net 4.

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How To Compare Date From Access Database With Date In Texbox

Mar 26, 2012

my sql statement is returning null when when I compare date from access database and date entered in textbox in vb. seems to me that the two dates are of different format so null is returned from the select statement but how do I go about this.[code]

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Left Join Linq To Entity's .net?

Apr 11, 2011

I can't figure out that linq to entity query syntax. My problem is that if the value of the Calls table is null then noting comes up, I want to make something like a left join to get 'all' rows from the Calls table.I tried to group it but I can't figure out the correct way to write it.

Dim TicketQuery As ObjectQuery = From c In EnData.Customer _
Join t In EnData.Calls On t.CustomerID Equals c.CustomerID _
Join Status In EnData.Lists On t.Status Equals Status.ListValue _

[code].....

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Linq - Entity Framework Many-to-many Using Lambda

Feb 11, 2010

I'm using Entity Framework in Visual Studio 2010 Beta 2 (.NET framework 4.0 Beta 2). I have created an entity framework .edmx model from my database and I have a handful of many-to-many relationships.

A trivial example of my database schema is

Roles (ID, Name, Active)
Members (ID, DateOfBirth, DateCreated)
RoleMembership(RoleID, MemberID)

[Code]....

For brevity I turned the list of all the columns from the Members table into *

As you can see it's just ignoring the "Role" query.

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Querying An Entity That Has A Varbinary Field With LINQ?

Jun 5, 2012

When I try to query an entity that has a varbinary field in it I am getting error:"The LINQ expression node type 'ArrayIndex' is not supported in LINQ to Entities."

Here is my query:

Dim query = From entity In db.Entity
Where entity.Id= Id
Select entity.VarBinaryField

[code]....

The error gets generated when I check that the query isNot nothing.

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Return Column Names Of A LINQ Entity?

Feb 2, 2011

I am using LINQ to SQL queries to return data in my application. However I find it is now needful for me to return the column Names. Try as I might I have been completely unable to find out how to do this on the internet.

So if my LINQ entity table has the properties (Last_Name, First_name, Middle_Name) I need to return[code]...

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String Searching In Linq To Entity Framework?

Mar 2, 2010

I am wanting to create a Where statement within my Linq statement, but have hit a bit of a stumbling block.I would like to split a string value, and then search using each array item in the Where clause.In my normal Sql statement I would simply loop through the string array, and build up there Where clause then either pass this to a stored procedure, or just execute the sql string. But am not sure how to do this with Linq to Entity? ( From o In db.TableName Where o.Field LIKE Stringvalue Select o ).ToList()

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Cryptography - Command Line Argument To Compare The MD5 Results

Jun 11, 2009

I have a file called Test.txt with a one line of String equal to 'This is String', and I've created a command line argument to compare the MD5 results, why am I not getting a match?

CODE:

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VS 2008 Compare And Display Results Of Two Text Files

Dec 10, 2009

I started with not knowing anything and I have built 2 programs over the last month and a half and have learned valuable information from the help of this board. I have 1 last hurdle before I am done and I am hoping to get another tip for this. First of all let me start by explaining what I have done.

[Code]...

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Asp.net - List Of Select Data In Entity Framework (linq)?

May 4, 2012

This is my function:

Public Function GetAllEmployee() As List(Of Employees)
Return DB.Employees.Select(Function(q) New With {q.EmployeeID, q.LastName,q.FirstName}).ToList()
End Function

I'm getting an error:

Value of type System.Collections.Generic.List(Of <anonymous type>) cannot be converted to System.Collections.Generic.List(Of NorthwindModel.Employees).

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Asp.net Mvc - For Each Loop LINQ Insert Giving Cannot Add An Entity That Already Exists?

Mar 11, 2010

I have the following code, that in my head should create a new row in a table:

Dim fin As Boolean
Dim db2 As New ChecklistModeldbmlDataContext
For Each a In bServers

If collection("fin" & a.ServerName) = "true, false" Or collection("fin" & a.ServerName) = "true,false" Then

[Code]...

It only ever adds one record in to the table and then errors with Cannot add an entity that already exists.

Now it should enter 4 rows into the table, but I can't work out why the above gives me that error.

I've also tried having the db2.SubmitChanges() outside of the for each and it just inserts the last row.

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C# - Entity Framework/LINQ To SQL Data Binding Use Reflection?

Apr 20, 2009

I'm taking a peek at both the Entity Framework and LINQ to SQL, and while I like the systems (and of course the LINQ integration) I'm a little skeptical on the data-binding aspect. I've taken query results and inspected them, and they don't appear to implement the standard .NET list-binding interfaces (IBindingList, and more importantly ITypedList), leading me to believe that binding them to a grid (or anything else) is going to use reflection to get/set my entity properties. This seems like a comparatively expensive operation, especially when all of the code is generated anyway and could implement the interfaces. Is reflection used to get/set the value of the properties?

Edit: I'm actually concentrating on whether or not ITypedList is implemented somewhere along the way, as that's what has the capability to provide an explicit mechanism for defining and interacting with properties without resorting to reflection. While I didn't have a LINQ to SQL project up,I did inspect a simple Entity Framework entity query result, and it did not appear to implement ITypedList.

Edit 2: After accepting Marc's answer, I thought it might be helpful for others if I posted some simple code I used to seamlessly implement his solution. I put the following in the static constructor for my class:

public static ContextName()
{
foreach(Type type in System.Reflection.Assembly.GetExecutingAssembly()[code]....

While this is for LINQ to SQL, I'm sure an equivalent version could be written for the Entity Framework. This will scan the assembly for any types with the Table attribute and add a custom provider for each of them.

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Random Sort List With LINQ And Entity Framework In .net?

Mar 17, 2010

I've seen many examples in LINQ but i'm not able to reproduce the same result in vb.net.

I have following code: Dim context As New MyModel.Entities()

Dim rnd As New System.Random()Dim gardens As List(Of Tuin) = (From t In context.Gardens Where _
t.Approved = True And _
Not t.Famous = True _
Order By rnd.Next() _
Select t).ToList()

[Code]...

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Compare Date - Start Date Should Not Be More Than End Date

Aug 12, 2011

i have 2 datetimepicker which are startdatedatetimepicker and enddatedatetimepicker.. the start date should not be more than end date..thus i need to check these two date.. here is my code...

[Code]...

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Linq To Entities Filtering An Entity Dynamic/Strongly Typed?

Apr 24, 2009

I am binding a Winforms Grid to an entity. (For reasons I won't go into here it must be bound to the entity, not the result a query) The code is as follows:

grid.DataSource = myEntities.entityName.Where("it.field = " & field)

It works, but it obviously isn't strongly typed. Is there a way to define the Where clause of an entity using a strongly typed notation?

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