.NET Tutorials, Forums, Interview Questions And Answers
Welcome :Guest
Sign In
Register
 
Win Surprise Gifts!!!
Congratulations!!!


Top 5 Contributors of the Month
MarieAdela
Imran Ghani
Post New Web Links

Deserializing with DataContractSerializer by-pass member initialization?

Posted By:      Posted Date: October 16, 2010    Points: 0   Category :WCF
 
Hi,

I am really puzzled to understand why a member's initializer that constructs an instance of List<T> is not executed resulting in a NullReferenceException when I deserialize Book class, listed below. The DataContract is as follows and the comment indicates where  NullReferenceException is thrown :

namespace Bookshop {
    [ DataContract ]
    public class Book {
        string title;
        List<Person> authors = new List<Person>(); // Initialize authors
       
        public Book( string title, params Person[] author ) {
            this.title = title;
            this.authors.AddRange( author );
        }
       
        [ DataMember (Name="ti") ]
        public String Title    {
            get{ return this.title; }
            set{ this.title = value; }


View Complete Post


More Related Resource Links

DataContractSerializer deserialization puzzle - by-pass member initialization.

  
Hi, I was using WCF and during the transmission of a object, of the type Book, see code below, the deserialization process throws a NullReferenceException. To isolate the problem, I uses a unit test like this rather than involving the full blown WCF marshalling. This appears to be solely a serialization/deserialization problem and has nothing to do with the communication issues in WCF. [Test] public void TestSerializeAndDeserializeBook() {     Book book = new Book( "Testing Serialization and Deserialization",                         new Person( 100, "Tom", "Smith" ),                         new Person( 101, "Peter", "Pan" ) );     DataContractSerializer ser = new DataContractSerializer( typeof(Book) );     using( Stream stm = new MemoryStream() )     {         ser.WriteObject( stm, book );         stm.Seek( 0, SeekOrigin.Begin );         Book regen = ser.ReadObject( stm ) as Book; // NullReferenceException here     &nb

How to Pass Values Between Web Pages ASP.NET

  
You can pass information between pages in various ways, some of which depend on how the redirection occurs. The following options are available even if the source page is in a different ASP.NET Web application from the target page, or if the source page is not an ASP.NET Web page:

Use a query string.

Get HTTP POST information from the source page.

The following options are available only when the source and target pages are in the same ASP.NET Web application.

Use session state.

Create public properties in the source page and access the property values in the target page.

Get control information in the target page from controls in the source page.

How to Pass Values Between ASP.NET Web Pages

  
You can pass information between pages in various ways, some of which depend on how the redirection occurs. The following options are available even if the source page is in a different ASP.NET Web application from the target page, or if the source page is not an ASP.NET Web page:

Use a query string.

Get HTTP POST information from the source page.

The following options are available only when the source and target pages are in the same ASP.NET Web application.

Use session state.

Create public properties in the source page and access the property values in the target page.

Get control information in the target page from controls in the source page.

pass value from textbox to action, formcollection best way here?

  

Hi I'm building a e-commerce store and on quantity of product I'm going with a textbox. I thought I would ask how would you do this? a viewmodel to use a strongly typed textbox or just get the value of the textbox from the formscollection passed in to the action?


Thanks for any input


Pass a grid column value to a Modal

  

Hi, I have a requirement to hide a field called details on a gridview and show it in a jQuery modal dialog when users click on the Customer ID hyperlink. This grid is created programmatically. I will be hiding the details column via the CSS display:none property. Does some one know how can I pass the grid's selected hidden column value to the modal? Here is some of the code I started:

            GridView mygrid = new GridView();
            //.....................................More columns code for the grid

            //Here is where I need to pass the Details column value associated with the customer ID field selected to the Modal and open the Modal dialog.            
            HyperLinkField linkField = new HyperLinkField();
            string[] dataNavigateUrlFields = { "CustomerID" };
            linkField.DataTextField = "CustomerID";
            linkFi

Pass ASP.NET membership identity object across domain?

  

I am trying to figure a way to SSO with ASP.NET membership and role model.

I can implement custom membership provider which consume web services hosting on a server.

With encryption of data. No problem.

But my question is, If I sign on a website with my provider, got my identity object on that application,

could I pass it to another website on another domain which use the same provider and by doing so, do not need to login again?


If this is possible, I am going to implement this solution. Please tell me what's your take on this.


How to pass value to another form

  

Dear experts,

                     I have QuoteNumber filed in Db.aspx(ddquote.txt) i want to pass this QuoteNumber values(values should to another web form/page i.e. mail.aspx when i click mail button, Message should supposed to display in textbox(txtQuote.txt) of mail.aspx form/page is "You are sending "QuoteNumber"  quotation to "MailID", Thanks.

 

 

 


How to retrieve data from SqlDataSource and pass to a variable?

  

Hi there,

I have a page in my website where there is very little code-behind. I only have two lines of code in Page_Load() and the rest of the code is declarative ASP.NET code. I have a FormView control which uses a SqlDataSource to get some order information. The SqlDataSource calls a stored procedure called usp_GetOrderDetails, here's the code for the SqlDataSource:

    <asp:SqlDataSource ID="sdsFormOrderDetails" runat="server" 
ConnectionString="<%$ ConnectionStrings:ForexDB %>"
ProviderName="<%$ ConnectionStrings:ForexDB.ProviderName %>"
SelectCommand="usp_GetOrderDetails" SelectCommandType="StoredProcedure"
UpdateCommand="usp_UpdateOrder" UpdateCommandType="StoredProcedure"
>
<SelectParameters>
<asp:ControlParameter Name="orderId" ControlID="grdOrders" PropertyName="SelectedDataKey.Value" />
</SelectParameters>
<UpdateParameters>
<asp:ControlParameter Name="orderId" ControlID="frmOrderDetails" PropertyName="SelectedValue" />
</UpdateParameters>
</asp:SqlDataSource>

Get Member from LDAP using C# 2.0

  

I'm currently writing a process where I need to determine if an User on my LDAP string is an Admin.

How can I accomplish this?  What would be the easy and quickest way?

I've been trying to use the code below..... Any feedback is greately appreciated. Tks

 

 


Using Session to pass data between forms

  

In my app, I am displaying an Rss Feed, I have a button that takes the user to another form where they can select a them.  Upon selecting the theme, they are taken back to the original form. 


If the user has selected which theme they want to view then they click on the button to change theme, I need to pass the information about what rss feed they were viewing through session so that once they select the theme they want they are redirected back to the main page and the rss feed they were viewing should still be displayed.


Since I've already bound the data to the xmlDataSource and DataList I am trying the following:


Session.Add("CurrentRssFeed", XmlDataSource1.DataFile);

Session.Add("CurrentDataList", DataList1);


I'm not sure I am passing the data over correctly and I'm not sure how to specify it in the page_preinit.


Any ideas???




Deserializing nullable model properties

  

Hi everyone,

I'm posting Json data to an action that has a model class as a parameter using the JsonValueProviderFactory. Everything works except for any nullable properties in the model, such as double? and bool? - they always materialize as null, even if a value is posted.

I'm not sure if this issue is specific to the JsonValueProviderFactory, or MVC in general.

Being new to MVC I'd appreciate any help with this issue.

Cheers,
Anthony.


How to pass paramters to Jquery modal window

  

Hi I have a webpart in a page in which there is a gridview(which shows list of customers). When I click on a link button in gridview, I would like to popup a JQuery modal window and fill the popup(this contains textboxes, then a gridview which contains mapped systems for thet customer, and another gridview which contains list of configured reports for that customer) with the details based on the customer name(link) clicked. Here I need to pass the customer Id and customer name parameters based on which I can fill the Jquery modal window.

Can any one have an idea to pass parameters to JQuery modal window in order to fill the contents inside it?


How to pass parameters to MDX through URL?

  

I have an SSRS report. I created it using BIDS and it uses a Sql Server Analysis Service data source.  The data source query is an MDX query with one parameter: @region, a default value has been set for this parameter.  The value which @region takes looks like [USA].[Northeast].[New Hampshire].[Coos County].

The MDX query goes like this:

Select ....

FROM MySSASDataSource

WHERE StrToMember(@region)

This report runs properly inside BIDS or through web browser after deployment.  In my report manager at http://localhost/Reports, I am able to view this report by selecting the value for the @region parameter from a dropdownlist, which contains such values as

Coos County
Cheshire County
Sullivan County
Strafford County
... ...

I know that we can pass query parameters to SSRS through the URL. I have successfully done so with relational database which uses regular SQL. But, I have not succeeded in passing this @region parameter of my MDX query through the URL.

I tried the following:

http://localhost/ReportServer?/MyReportProject/MyReport&rs:Command=Render&rc:Toolbar=false&region=Coos%20County

It didn'

Pass the server variable to search core result web part

  

I'd like to custom the search core result web part to filter results based on the log on user name.

It can easily be done in Dataview web part.

However the search core web part doesn't accept "<parameterbining>" to pass in the server variable [logon_user]. I can't figure out how to use <xsl:param> to get this server variable either.

 

Any ideas? Thanks a lot!


If you get confused, listen to the music play...

How to pass a parameter from a choice filter with project IDs to a KPI web part?

  

Hi,

I have an excel pivot table like this:

Report Filter: Project ID
proj_name     Status 
A              70
B              60
C              80

I have this workbook published onto Sharepoint server through excel services.
On the site i have a choice filter that has all the project ID's. I am able to show this table in a web part and filter the web part by passing parameter from the choice filter to the report filter in the workbook as shown above.
Problem:
I added a KPI webpart that uses the "status" from the above table as its indicator value. What I want to do is that I want to pass the parameter from the choice filter on the site to this KPI web part so that it will show me the corresponding status dynamically accoring to the project chosen.
Can someone help me solve this problem?


Somehow to pass a value to a action without having it on display in url?

  

Hi. I really cant figure this out but so I thought I would ask you. My scenario is I'm listing customers with paging. Lets say Im on page 4 and I choose to edit a customer. What I want to do is to be able to return to that page 4 when Im done editing the customer. How should I approach this?


Azure One Month Pass

  

Just saw this Azure offer.  You can try Azure for free, no credit card required, for a full month.

25-08-2010 7-24-07 PM

Get all the details here and read the fine print (like US only)

Bookmark and Share
Categories: 
ASP.NetWindows Application  .NET Framework  C#  VB.Net  ADO.Net  
Sql Server  SharePoint  Silverlight  Others  All   

Hall of Fame    Twitter   Terms of Service    Privacy Policy    Contact Us    Archives   Tell A Friend