I use LINQ to SQL and I added some meta data to my entity objects.
But how can I validate this entity object in ASP.NET 3.5 Forms ? I find a lot information for validating this objects in MVC, but that is not what I want of course :) .
I have a button click event that adds a record to a table based on the userid and threadid the user is viewing. I am a bit new to entity so I am stumbling around. I have to where conditions
ThreadID == threadid
UserId == userIdPosts
I have this query but do not know how to execute it and if I have it as is I get this in the yellow screen of death Both the theadid and userIdPosts have data in them.
var query = context.TrackLists.First(t => t.ThreadID == threadid);
context.TrackLists.First(t => t.UserId == userIdPosts);
Sequence contains no elements
Line 90: // find is user has already tracked this thread.
Line 91: var query = context.TrackLists.First(t => t.ThreadID == threadid);
Line 92: context.TrackLists.First(t => t.UserId == userIdPosts);
I use VS 2010 Ultimate. I created an 'asp.net web application' from scratch, added a 'ADO.NET Entity Model' to my project (EF4).
The problem I'm having is that whenever I try and use an EntityDataSource to pull data out of my entity model I am near constantly getting the following error:
"The metadata specified in the connection string could not be loaded. Consider rebuilding the web project to build assemblies that may contain metadata. The following error(s) occurred:"
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I am trying to configure Entity Framework 4 in the Web.config file using this ConnectionString
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I would like remove the "*" and add the actual path for my dll file.
How to find the path for a dll in Visual Studio with no add-on? (I am pretty new in .net)
For the death of me I cannot remember how I got this right the last time.
I got 2 tables in my database, tblClients and tblOrders
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In my project I got an Client and Order class
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I create and edmx and then a "context" class (forgot most of EF stuff. This is just a quick demo I got to have ready)
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However, when I run I get this error: Mapping and metadata information could not be found for EntityType 'ClientManager.Domain.Client'.
Let's say we have a entity to add - an Invoice with multiple Lines
public class Lines
{
public string ObjectName;
public string Color;
}
public class Invoice
{
public string DocumentID;
public DateTime InvoiceDate;
public List<Lines> lines;
public string Observation;
}
The Lines is valid if and only if it has ObjectName and Color
Now, when in AddMode , the requirements are to show enter a new Invoice with 10 Lines by default .
This was easy (binding to an object that contains list, right?) - but in validation mode, the ModelState.IsValid is validating all my 10 lines - regardless if the user have been entered only 2 lines.
I have tried to remove the empty lines by writing a Binder for Invoice, inheriting from DefaultModelBinder and removing the empty lines ( those for ObjectName AND Color both nulls or empty ) .But, no matter what overriding method (CreateModel , BindModel ) I have used , no success. The binding model occurs first.
I have tried to do ModelState.Clear() and ValidateModel(invoice) in the controller. But ValidateModel is not validating "sub-properties of complex properties" - see comments from
[URL]
If you know how to either :
a) re-validate all properties (including for complex object)
b) modifying the model before ModelState grab errors
c) ?
(I can not debug with MVC2 source code - but this is another post...)
im tryin to create a login form.
and am receiving the following error:
Object reference not set to an instance of an object
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and heres my aspx page:
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Stored procedure:
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Is there a method like IsValid(); in Entity Framework Generated classes?
Would I have to create a method like the above?
PS.
I would like the method to return a boolean.
On DBML I have two entities as Parent, Child. I am trying to assign Child class properites in a Parent.
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I am getting the following Error:
Cannot access a disposed object.
Object name: 'DataContext accessed after Dispose.'.
I would like to extend the HtmlHelper by using metadata (similar to DataAnnotaions metadata). Specifically I want to be able to add a 'Title' attribute to html controls that will then appear as a tooltip on the control. I would like to keep the tooltip text with my model, for example by adding 'Tiltle' metadata to the model as follows:
[DisplayName("User Id")]
[Title("Enter your 10 digit user id")]
property UserId { get; set; }
So the questions are:
1. How do I add metadata (such as 'Title') to my model?
2. How do I access this metadata in my HtmlHelper extension method?
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i'm having trouble because when it has no return value i get the error
Object reference not set to an instance of an object.
im using a sqldatasource and i want it to query a table chosen from a dropdownlist, so i wrote the following in the .cs file
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im recieving this error msg: Object reference not set to an instance of an object (pointing to the line containing the select command)
i don't know what's the problem, i tired a hard-coded statement and it worked fine!
I am adding rows to table and setting value row/cell value, but for datetime field it is giving me error
Object reference not set to an instance of an object.
Initially I am adding a column to table as
table.Columns.Add("Upload Date",
typeof(DateTime));
Then I assigning value to row as
row["UploadDate"] = result["Execution Date"].ToString();
As I have I also null or empty value in the "Execution Date" field .
I am trying to find out if there are records in a table
based on the results of the query.
I have this that is not working
The query works but the problem is validating the resutls
MembershipUser myUser = Membership.GetUser();
Guid userIdPosts = (Guid)myUser.ProviderUserKey;
int currentThreadid = Convert.ToInt32(Request.QueryString["Threadid"]);
var query = from t in context.TrackLists
where t.UserId == userIdPosts && t.ThreadID == currentThreadid
select new { t.UserId, t.ThreadID };
foreach (var results in query)
{
Guid queryUserID = results.UserId;
}
if (queryUserID == null)
{
}
select * from MyTable select "MonthName"= case when datepart(month,date1) =1 then 'January' when datepart(month,date1) =2 then 'February' end , count(*) as CountByMonth from venkat group by datepart(month,date1)
View 1 RepliesI am using the following LINQ to entity to get data from my db.
It should return only one row. So i want to be able to get the first row in the set and not have to go through a foreach.
I would also like to check and make sure it is only returning one row, if it returns multiple i need to throw an exception
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i have problem white Object datasource. i have a multi-tier Application that include common layer ,DAL Layer,business logic and persantation layerwhen i add a object datasource to my page, it bring me only common layer classes . but i want use bisuiness layer classes what do i do ?
View 1 RepliesI am storing a custom "Organisation" object as a session variable. One of the properties of the Organisation object is "OrganisationID" (integer). I have a DataSource that requires a parameter value to run, and I want to use a SessionParameter to populate this. In a previous version, I stored the OrganisationID directly as a session variable. In that case, I could easily access it like this:
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However, how do I now access the OrganisationID property of an "Organisation" type session variable (called "Organisation")? I have tried this, which does not seem to work: <asp:SessionParameter Name="OrganisationID" SessionField="Organisation.OrganisationID" Type="Int32" />
And not doing a View that connect two tables ?Is there a way to connect two entities together in one new entity?
View 1 RepliesI set up Entity Framework for my Table and Stored Procedure to return data. Created a Domain Class as well.
In Domain Class, I am returning Objects as collection.
On .Aspnet page when I drop a Control(Combo,Dropdown) I can set up the source for the controls visually if the source is table.
However, In domain class I have stored precedure object that return collection of data And I cant not set up visually from Designer, I am only available to write code behind. is it possibble that i can set up from desingner.
CAN we use Entity framework in web services.I the following error while the code connects to the database using entity framework
View 3 Repliesi use a generic list of object to bind a GridView
In the RowDataBound event i need to access to the entity associated to the row and not only to the single property using
DataBinder.Eval(e.Row.DataItem, "propertyname")
I have a sql server database that includes the field ArticleID of type uniqueidentifier that is a primary key and is set to be auto-generated by the database when a new article is added.If i generate my entity model and do the following code:
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Then a new article is saved to the database but the entity framework must be generating a new blank Guid and saving that to the database rather than allowing it to be auto generated as the articleid that shows up saved is all 0.How can i get the Entity Framework to let the Database generate the ArticleId?
This is the first time I have been working on databases and I am trying to insert data using an object datasource but no data is being inserted and no exception is thrown. I'm not sure where I am going to wrong. I am putting user data into session variables and inserting the session variables into the dataacess class layer and have a try and exception but nothing being thrown. Any help would be really appreciated because I don't know even where to start looking with this or how I can get the error to be thrown. Please see some of my code below to give an idea of what I am doing
Object Access Class
public void InsertCarPolicyHolder(PolicyHolderClass ph, CarInsuranceOptions options)
{
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I have a Public Sub listed in a class file that I am using to store Select, Update,etc...methods for an Object Datasource. When I attempt to configure the datasource, the Class appears as a business object, but the sub within the class is not available for method selection. (It does not appear in drop down list in wizard.)
The sub exists, so where is a good place for me to start looking for a fix? I have part of the class file listed below:
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