Solved

linq query with ordered columns

Posted on 2011-09-30
4
313 Views
Last Modified: 2013-11-11
I'm new to Linq and I'd like to rewrite the query I use to return results from a DomainService so that the columns are returned and a specific order.  If this was SQL I would use somthing like SELECT col1, col2, col3 from myTable.  The rows will be loaded into a datagrid in a Silverlight app.
public IQueryable<myTable> GetMyTable()
        {
            return this.ObjectContext.myTable.OrderBy(e => e.ItemID);
            
        }

Open in new window

0
Comment
Question by:PeterTrefren
  • 2
4 Comments
 
LVL 75

Expert Comment

by:käµfm³d 👽
ID: 36893417
I'm not 100% on this, but have you tried switching the order of the properties as defined in your myTable class?
0
 
LVL 14

Expert Comment

by:binaryevo
ID: 36893490
Im not sure how you would do it with a datatable but, the syntax looks like this if you have a specific object your using:

var test = from t in myListFromDomainObject
                 select new BindingObjectThatICreated
                 {
                      ObjectVal = t.ObjectVal,
                      ObjectVal2 = t.ObjectVal2
                 }

Here are some pretty good basic examples:  http://msdn.microsoft.com/en-us/vcsharp/aa336756

Hope this helps, if you need more direction just let me know.

0
 

Accepted Solution

by:
PeterTrefren earned 0 total points
ID: 36920647
binaryevo: I tried your solution and was getting an error on return from the DomainService to get the data.  The following thread post http://forums.silverlight.net/p/119935/270919.aspx has what you're talking about as a solution but the person who posted points out a limitation of this kind of solution.  


For what I want to do, displaying columns in a specific order in a grid, the code I've attached works the best.




<riaControls:DomainDataSource Name="questionDataSource" LoadSize="20" QueryName="GetTestQuestions" AutoLoad="True">
                <riaControls:DomainDataSource.DomainContext>
                    <ds:QuestionContext></ds:QuestionContext>
                </riaControls:DomainDataSource.DomainContext>
            </riaControls:DomainDataSource>

            <sdk:DataGrid AutoGenerateColumns="True"  Name="dataGrid1" Width="Auto" Height="Auto" MinHeight="100" 
                          ItemsSource="{Binding Data, ElementName=questionDataSource}" VerticalScrollBarVisibility="Visible">
                <sdk:DataGrid.Columns>
                    <sdk:DataGridTextColumn Header="QuestionID" Binding="{Binding QuestionID}"  />

                    <!--Question-->
                    <sdk:DataGridTemplateColumn  Header="Question" >
                        <sdk:DataGridTemplateColumn.CellTemplate>
                            <DataTemplate>
                                <TextBlock TextWrapping="Wrap" Text="{Binding Question}" />
                            </DataTemplate>
                        </sdk:DataGridTemplateColumn.CellTemplate>
                    </sdk:DataGridTemplateColumn>

                    <!--Ans1-->
                    <sdk:DataGridTemplateColumn  Header="Ans1" >
                        <sdk:DataGridTemplateColumn.CellTemplate>
                            <DataTemplate>
                                <TextBlock TextWrapping="Wrap" Text="{Binding Ans1}" />
                            </DataTemplate>
                        </sdk:DataGridTemplateColumn.CellTemplate>
                    </sdk:DataGridTemplateColumn>

                    <!--Ans2-->
                    <sdk:DataGridTemplateColumn  Header="Ans2" >
                        <sdk:DataGridTemplateColumn.CellTemplate>
                            <DataTemplate>
                                <TextBlock TextWrapping="Wrap" Text="{Binding Ans2}" />
                            </DataTemplate>
                        </sdk:DataGridTemplateColumn.CellTemplate>
                    </sdk:DataGridTemplateColumn>

                    <!--Ans3-->
                    <sdk:DataGridTemplateColumn  Header="Ans3" >
                        <sdk:DataGridTemplateColumn.CellTemplate>
                            <DataTemplate>
                                <TextBlock TextWrapping="Wrap" Text="{Binding Ans3}" />
                            </DataTemplate>
                        </sdk:DataGridTemplateColumn.CellTemplate>
                    </sdk:DataGridTemplateColumn>

                    <!--Ans4-->
                    <sdk:DataGridTemplateColumn  Header="Ans4" >
                        <sdk:DataGridTemplateColumn.CellTemplate>
                            <DataTemplate>
                                <TextBlock TextWrapping="Wrap" Text="{Binding Ans4}" />
                            </DataTemplate>
                        </sdk:DataGridTemplateColumn.CellTemplate>
                    </sdk:DataGridTemplateColumn>


                </sdk:DataGrid.Columns>
            </sdk:DataGrid>

Open in new window

0
 

Author Closing Comment

by:PeterTrefren
ID: 36941267
This provides the what I wanted.
0

Featured Post

3 Use Cases for Connected Systems

Our Dev teams are like yours. They’re continually cranking out code for new features/bugs fixes, testing, deploying, testing some more, responding to production monitoring events and more. It’s complex. So, we thought you’d like to see what’s working for us.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Today I had a very interesting conundrum that had to get solved quickly. Needless to say, it wasn't resolved quickly because when we needed it we were very rushed, but as soon as the conference call was over and I took a step back I saw the correct …
Exception Handling is in the core of any application that is able to dignify its name. In this article, I'll guide you through the process of writing a DRY (Don't Repeat Yourself) Exception Handling mechanism, using Aspect Oriented Programming.
Windows 10 is mostly good. However the one thing that annoys me is how many clicks you have to do to dial a VPN connection. You have to go to settings from the start menu, (2 clicks), Network and Internet (1 click), Click VPN (another click) then fi…
In this video I am going to show you how to back up and restore Office 365 mailboxes using CodeTwo Backup for Office 365. Learn more about the tool used in this video here: http://www.codetwo.com/backup-for-office-365/ (http://www.codetwo.com/ba…

813 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

12 Experts available now in Live!

Get 1:1 Help Now