How do you reference a LINQ object that you have created such as a list, in your HTML? I have seen examples of how to do this using MVC, but I am using Web Forms. Here is my LINQ :
[Code]....
And I want to be able to for example check if my linq returns any data and if so iterate through it using a foreach loop in my HTML. change my linq so that it returns a generic list rather than what it is doing at the moment.
I'm trying to set a value for an HTML Element within my code-behind. I need to set a <div> elements "display" property to "inline". The way I have it coded is like this:
Code:
divContact.Style("display") = "inline"
Is this the right syntax? I only ask because it doesn't seem to work but I don't get a run-time error when the statement is executes. ???
I want to reference a variable inside an html element without having to use an asp lable. for example at the start of the page I grab the current year and then inside a paragraph html tag I want to output this. I have tried using <%# year%> and <%=year%> but I get an error. Here is the code
[code]...
I'm trying to write a simple declarative html helper: [Code]....
The helper works fine if I embed it into the page I want to use it on. But if I move it to a separate .cshtml file and place that file in the ~/Views/Helpers directory, my view can't be compiled anymore because the helper is not found.According to Scott Gu's blog article on Razor it should work.
The only workaround I have found so far is placing the Html helper in App_Code and Referencing it as @[MYHTMLHELPERFILENAME].Echo(...) . This works but is a bit messy since I don't want to repeat the name of my extension method (Echo.Echo("inputstring"), nor do I want to put all of my html helpers into one single file (something like MyHtmlHelpers.cshtml).It certainly isn't what Scott announced either, so I guess I must be doing something wrong.
I have a collection of objects that I want to use LINQ in order to filter out only objects that have properties that meet a certain criteria. I am not big on LINQ so I am not sure how to do this.
I create a basic LINQ statement and get the records this way
Dim lr As IEnumerable(Of LogRecord) = From rr In _logRecords where rr.username="something"
but I only want to add that where condition if someone actually filled in a textbox.
I have other conditions to do the same thing with.
Using the following code:
Private Sub MakeMeSomeXmlBeforeRyanGetsAngry()
Dim db As New MyDBDataContext
Dim customer = From c In db.Customers Select c
Dim dcs As New DataContractSerializer(GetType(Customer))
Dim sb As StringBuilder = New StringBuilder
Dim writer As XmlWriter = XmlWriter.Create(sb)
dcs.WriteObject(writer, customer)
Dim xml As String = sb.ToString
Response.Write(xml)
End Sub
I am attempting to serialize my linq collection of customers. But it keeps throwing
Type 'System.Data.Linq.DataQuery`1[MyDB.Customer]' cannot be serialized. Consider marking it with the DataContractAttribute attribute, and marking all of its members you want serialized with the DataMemberAttribute attribute. See the Microsoft .NET Framework documentation for other supported types.
My issue is that I have already marked the dbml Serialization Mode to UniDirectional and when I check the dbml codebehind all of the DataContract()> and DataMember()> elements are there.
I am not sure how to proceed. I have tried adding various dataloadoptions and setting deferredloading to false, but no luck.
I am use the new ASP.NET MVC 2 and Entity Framework, but when I try to create a new view with strongly-typed option selected, the entity objects is not appears at dropdown and I cannot use the view creation wizard. I recompile the solution, but still not appears yet. Have any workaround that I forgot to do to enable the entities to be displayed at dropdownlist ?
View 5 RepliesI am using Linq To Sql to get List of objects with data from database. To bind data with a grid view i am creating a dataset explicitly and then adding List values to that explicitly created dataset.
Now my question is whether it is a good pratice to do what i am doing (in terms of resource utilization) or is there any better way to this...
Entity framework easily allows for this but how can I detach objects in linq to sql?
View 1 RepliesI'm new on LINQ and I'm searching the best way to do this:
I have an object client that has a list of subscriptions. Subcription has a boolean attribute "Active". Now I want load only the clients with list > 0 and subscription active.
The question is: If a client has 3 subscriptions, but only 2 are active, how can I load only the latters ? I tried in this way:
[Code]....
The query selects clients that has at least one subscription active, but viewing the results, it loads also subscriptions not active of the same client.
I have two business objects mapped via LINQ to tables. One of the objects contains an instance of the other object and share a key as an identifier.I want to retrieve Class A and within class A all of Class B's values as well. What I am doing is this:
[Code]....
[Code]....
This seems a little clunky, as in slow. Is there a better way to get the Class B (User) information without making a query every time?
I have written a page which uses Linq to query the database and bind the resulting IQueryable to a datagrid. I have a partial class which contains extra properties which derive their values based on other values brought in from the database.
Sorting works fine on fields that are actually in the database but not for the derived fields. When I attempt to sort on such a field I get an error saying "The member 'Trip.Difference' has no supported translation to SQL. how to allow sorting on these derived fields?
I have a really weird problem. It actually made me restart the computer.
View 1 RepliesI'm new to linq. here is the scenario i need to write query for.I have a "Candidate" table with a varchar property "Skill"I have the table OR-mapped with LINQ to SQL on dbml file. Now I want to write linq query that:Selects all Candidates that have skill containing any of the keywords from ("asp.net","php","java")
View 1 RepliesI would like to write Set difference minus operation with Linq on list objects using Except method. [Code]....
Tha above code always returns lstrbb objects.
I am loading in my page a html code that have server an client objects. View sample:
<b>prueba imagen</b>
<img alt="hola mundo" src="_img/personalcarta/img_off.png" />
<asp:ImageButton ID="Img4_izq" class="Imagen" Width="95px" Height="95px" runat="server" ImageUrl="~/_img/personalcarta/img_off.png" OnClick="Img_Click" />
the problem is only load me the client objects. How Can I do it for load server objects since an html code?
I am creating HTML objects in my code, and giving them IDs (see below) :
[Code]....
But whenever I try to make reference to this ID in my code, it does not work. After viewing source, the ID has been changed to ctl00_ContentBody_divMTR. Why is this happening and can I prevent it?
have some Objects, lets say Employee and Role defined as below and I have defined relationships in my database that gives me a list of objects say employees and thanks to my framework each employee object also has a Role object linked via the RoleIDID, UserName, Password, Email, RoleIDRoleID, RoleNameSo in code I can do something like this
Employee emp = dataService_GetEmployeeByID(1);
string RoleName = emp.Role.RoleName;
Now here is my problemI can bind any object in a repeater and it works fine for the first level in my relationship
For instance <%# Eval("UserName") %>
But I need to be able to show the details for my child objects as well (Role) so something like this (which does not work)
<%# Eval("Role.RoleName") %>
I know how to bind a simple objects to a dropdown list. However I am having problems binding my objects which contains sub objects to the control.i.e. with simple object i just do ddl.DataValueField = "myproperty"
with my objects they contains sub objects which i want to bind. I have tried ddl.DataValueField = "sub-object.myproperty" which doesnt work.
firstly a static class only ever exists once and is not an instance. Any static members (ie static int NoOfPeople;) is stored in one place and is shared between all sessions (like the old global variables).
Now static methods is where i'm not 100% sure. If I have a static method that doesn't use any other static members could this cause inconstant results, example (this is a fairly pointless method but just a quick example of the top of my head)
[Code]....
So in this example if two sessions (or threads) were to call this at the same time - would they both get back the expected results, because the method only uses private data (a, b and totalToReturn).Im sure this sounds a little simple but I will be using static methods to build user objects and various other objects that there will have to be a 100% garentee that the objects will not get mixed up between sessions and the wrong things return to the user.
Assuming I have the following ASP.NET HTML Code:
[code]....
I am trying to write a linq query that will retrieve all the ID's from any asp tag. Also, the query needs to group everything together alphabetically. So for the example above, the linq query should return "lbl1", followed by "lbl2", followed by "txt1", and finally "txt2". Notice it did not grab the "bodyID" because it was not part of an ASP.NET tag. Is there an easy way to do this? I am using C#, by the way.
I have a basic Linq query and what I need to do is query the DB then display the data in HTML.Typically I would bind this to a control but in this instance I need to actually generate the HTML in the code behind page.The Linq query is very basic something like this with Northwind:[Code]....
Instead of binding that to a gridview how can I write out the html... I'm sure I can use stringbuilder or smilar to create the html but I'm not sure how to get he data in the tables... foreach datarow in?
I've installed a Free TextBox editor to allow clients to do a write up about themselves and style it with HTML. Been reading about cross site script attacks (XSS) and want to make sure I'm correctly uploading the data collected with the Server.encode method.
Is this the right way to do it?:
[code]....
I'm have .dbml Linq to SQL class named DExamination.dbml
[global::System.Data.Linq.Mapping.TableAttribute(Name="dbo.Examination")]
public partial class Examination : INotifyPropertyChanging, INotifyPropertyChanged
{
private static PropertyChangingEventArgs emptyChangingEventArgs = new PropertyChangingEventArgs(String.Empty);
private int _Id;
private string _Title;
private System.Nullable<System.DateTime> _StartDate;
}
...
[global::System.Data.Linq.Mapping.ColumnAttribute(Storage="_StartDate", DbType="DateTime")]
public System.Nullable<System.DateTime> StartDate
{
get
{
return this._StartDate;
}
set
{
if ((this._StartDate != value))
{
this.OnStartDateChanging(value);
this.SendPropertyChanging();
this._StartDate = value;
this.SendPropertyChanged("StartDate");
this.OnStartDateChanged();
}
}
}
...
Display in Edit
<%: Html.TextBoxFor(model => model.Examination.StartDate)%>
How to format StartDate like "dd/MM/yyyy" I've tried add DisplayFormat above
[global::System.ComponentModel.DataAnnotations.DisplayFormat(ApplyFormatInEditMode = true, DataFormatString = "{0:MM/dd/yyyy}")]
[global::System.Data.Linq.Mapping.ColumnAttribute(Storage="_StartDate", DbType="DateTime")]
public System.Nullable<System.DateTime> StartDate
{
get
{
return this._StartDate;
}
set
{
if ((this._StartDate != value))
{
this.OnStartDateChanging(value);
this.SendPropertyChanging();
this._StartDate = value;
this.SendPropertyChanged("StartDate");
this.OnStartDateChanged();
}
}
}
but not working Anyone have solution?
I need to populate a dropdownlist with results from a linq query done in my controller. I want users to be displayed but when the item is selected and submitted, the userid is passed back to the controller.my controller:
[Code]....