C# - Deserializing An Object That Is Different Than When It Was Serialized?
Mar 29, 2011
I have an issue with deserializing an object. I get an error 'System.Int32' cannot be converted to type 'System.Decimal'. This object has many child objects and since this object has been serialized, a new version of the object has one or many fields that have been changed from int to decimal and now I can't deserialize the object because it doesn't match my original object.
I have tried using the OnDeserializing method but the context parameter.
Is there a way around this? I've found some examples online but it doesn't really apply to my situation. I would just like to know if there is a way to view my serialized object even if my object has now changed or if there is a way to find out which variable needs to be changed to decimal and how to go about doing it.
I've added your code but I'm not quite sure how to call it from my code. Here's what I've got:
public static Application LoadSnapshot(int appID, int statusID)
{
ApplicationSnapshotCollection AppSnap = new ApplicationSnapshotCollection();
AppSnap.LoadByAppAndSnapshotStatusID(appID, statusID);
[Code]....
How do I go about calling the constructor with the proper parameters in my scenario?
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Mar 29, 2011
I have an issue with deserializing an object. I get an error 'System.Int32' cannot be converted to type 'System.Decimal'. This object has many child objects and since this object has been serialized, a new version of the object has one or many fields that have been changed to decimal and now I can't open or view the object because it doesn't match my original object. Is there a way around this? I've found some examples online but it doesn't really apply to my situation. I would post some code but I don't think it would really help...I would just like to know if there is a way to view my serialized object even if my object has now changed and how to go about doing it.
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Jan 2, 2011
I have a table in my SQL Server DB that holds auditing information for certain actions a user takes within my system. Things like who performed the action, when it was performed, and what action are all pieces of information that can easily span multiple actions. But depending on the action performed, there may be other information that I want to capture, that is specific to the action. To handle this, I elected to add an "XML Metadata" column to the table that holds serialized XML of different metadata objects that I've created. I created a metadata object for each of the actions that I'm interested in tracking extra for. So each object is responsible for tracking specific extra information (metadata) for it's action. The objects are serialized and written to my new column.
I have SystemAction objects that I use to store information from this table, and I've added a string field that holds the XML string from the DB. The problem is, when I'm reading this XML back from the SystemAction objects, I'm struggling with a way to generically translate it back into it's correct metadata object. Each metadata object is going to have different fields, and each object has it's own static method that takes an XML string and attempts to return the metadata object type. So I could say:
SomeActionMetadata mdObj = SomeActionMetadata.BuildFromXML(xmlStringFromDB);
But I really don't know of a way to say "Here's some XML that could translate to any number of different objects. Figure it out and give me the right object back."
Given my current implementation, I could always just assign a unique ID to each metadata object that is stored as a field in each object, then use a case statement to switch on that ID and use the appropriate class's static build method to build the right object. But I was hoping for something a little more automatic than that. What if I have a List of SystemAction objects and just want to loop through them and generate the correct metadata object type?
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Mar 22, 2010
I have an Entity Framework data model. Part of the model is a Customer entity. The web service provides a method to get a customer, and to receive an updated version of this customer to be persisted.
To test this, I created a new ASP.NET web Application, (Solution > Add > New Project > ASP.NET Web Application), then added a reference to my service reference using the standard Add Service Reference dialog. I then call the service using the following code:
var client = new CustomerServiceClient();
var customer = client.GetCustomerByID(18); // get it
customer.LimitDown = 100; // change it
client.SaveCustomer(customer); // persist it
Everything works as expected.
Now, I do exactly the same thing, but this time with as ASP.NET Web Site (Solution > Add > New Web Site > ASP.NET Web Site). I add the reference in a similar fashion and copy and paste the code above into the new site. But now I get the following exception thrown on the 4th line:
System.InvalidOperationException The EntityReference object could not be serialized. This type of object cannot be serialized when t RelationshipManager belongs to an entity object that does not implement IEntityWithRelationships.
Source Error:
Line 2474: Line 2475:
public
SkyWalkerCustomerService.OperationResult
SaveCustomer(SkyWalkerCustomerService.Customer[code]....
Googling for this error returns very little. Why doesn't this work?I guess one answer would be to use a web application instead of a web site, but I have an large existing site to which I need to add the service reference, and I'd rather not convert it.
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Aug 16, 2010
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.
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Feb 28, 2011
I've been trying to deserialize the following JSON output into a vb.net object:
[Code]....
The following is what i've done so far:
[Code]....
I have problems reading the array value of "t". I'm quite sure that the problem lies in the PageTags() but i'm not sure how to go from here.
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Feb 22, 2011
I am really struggling deserializing a PHP json encoded string in ASP.NET.I am using nusoap and CakePHP 1.3 on the PHP side and mvc.net 4.0 on the web service side and everything was working well. However, I couldn't figure out how to pass a complex array as one parameter of the webservice, so I had the idea of serializing it as json and passing a simple string. So far so good...
$args['products'] = json_encode($booking['Booking']['prs_products']);
[code]...
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May 13, 2010
I'm trying to store some business objects in a SQLProfileProvider Profile property, however my business objects use public properties, not fields. This means I can't serialize as binary (correct?) so I'm serializing as XML. I've got the basic XML.Serialization attributes on the business objects, basically just XMLRoot and XMLElements with Type properties and an XMLArray attribute for a collection<T>. When I look at the data in the aspnet_Profile table, sure enough, it looks like an XML representation of my BOs:
[Code]....
Additionally, it works fine while the user is logged in.However, if the user logs out and logs back in, the profile property is a new instance of the BO, not what was saved in the profile. What am I missing here?
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Mar 10, 2011
i have been going through the documentation of viewstate. [URL]It was mentioned that objects that can be serialized are stored in viewstate. What is the meaning of serializing of objects ??
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Oct 13, 2010
I have a ListBox on my page. I'm making an AJAX call to a C# function, and I need to pass the values of the selected items. Here's what I have:
$('#btnSubmit').click(function() {
$.ajax({
type: "POST",
url: 'Default.aspx/GetSelectedValues',
data: '{selectedValues: ' + $('#lbItems').serialize() + '}',
contentType: "application/json; charset=utf-8",
dataType: "json",
success: OnSuccess
});
});
<select id="lbItems" multiple="multiple">
<option value="1">One</option>
<option value="2">Two</option>
<option value="3">Three</option>
<option value="4">Four</option>
<option value="5">Five</option>
</select>
[System.Web.Services.WebMethod]
public static string GetSelectedValues(string selectedValues)
{
//
}
The data being passed to the C# function looks like:
lbItems=1&lbItems=3&lbItems=5
Is there any built-in C# function that can deserialize that easily, to convert the values into an array of some sort? Or maybe there's a better way to pass the data from jQuery?
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Feb 6, 2010
I'm playing around with Web Services using Linq to SQl. I apparently have a lot of learning to do. What I'm trying to do below is pull data from the Northwind db Employee Table. I don't need to see the whole table, I'm just trying to select individual(s) but I keep getting the following error
"System.Data.Linq.Binary cannot be serialized because it does not have a parameterless constructor"
Code Below:
<WebMethod()> _
Public
Function EmployeeInfo()
As List(Of Employee)
Dim db
As
New NorthwindDataContext()
Dim output =
From cust
In db.Employees _
Select cust.EmployeeID, cust.FirstName, cust.LastName
Return output
End
Function
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Feb 11, 2011
I have an ASP.NET 4 web app that is using the Entity Framework to hold, amongst other things, a hierarchical structure of items that is used for features such as navigation.
One of the functions of the application allows the export of a particular branch of the hierarchy tree to XML, generated using a DataContractSerializer. Once exported, the intention is that the XML can then be uploaded to another instance of the same app, deserialized back into EF objects and then added to the data model on the second server.
When I try and import data in this way, I'm finding that I see the following error:
The object could not be added or attached because its EntityReference has an EntityKey property value that does not match the EntityKey for this object.
Taking a closer look at the XML that is generated by the serializer, I can see that the entity key is among the items that has been serialized. Since I'm importing entities that originate from a different database, some of the ID's clash.
What I'd ideally like to be able to do (unless I'm missing something here) is attach the imported entities to an object context and reset the ID's of the objects being imported.
Is there a smart way to do this? Do I simply have to set the ID for each of my imported entities to 0, attach them to the object context and then save changes?
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Aug 1, 2010
I have a serialized object which needs to be sent as an encrypted XML string. I am able to save the serialized object to a well-formed XML file, but this is not what I want. I have already got Rijndael encrypt/decrypt working for a sample string.
Person person = new Person("Irish", "Chieftain");
XmlSerializer xmlSerializer = new XmlSerializer(typeof(Person));
// Write serialized XML to file
System.Guid guid = System.Guid.NewGuid();
[Code]....
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Mar 2, 2011
In ASP.NET WebForms I want to pass arbitrary data from server to client and back again. I am serializing to JSON and have been simply producing JavaScript that creates the object on the client. I have no problem sending data to the server with ajax, but there are situations where I also want to send a Javascript object data back to the server on postbacks. So I guess it needs to be in a hidden field.
1) What is the best way to do this in terms of minimizing complexity and optimizing space and efficiency? In researching this I discovered Protocol Buffers but there does not seem to be a good C# implementation. I did find one, but it was a couple years old and self-described as buggy so that scared me.
2) If I just pass a JSON string, how can I be sure it will be safe to include as the value for a hidden field? Is there any reason I might not want to do this? I could Base64 encode, but it seems like this adds a lot of overhead. What is considered the best or preferred method?
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Nov 15, 2010
In the VS2005 environment, when I test my session to make sure the page redirects to the main page (itself) if the session is null, it works. There is no error.
The function I use for this is:
[code]....
However, when it is in the production environment in IIS 6.0, when the session has timed out, and I then do a postback by doing some slider control, I see the page reload but immediately thereafter, it throws a Server Error exception of : Object reference not set to an instance of object.
Looking at the stack trace, the event occured:
AJAXEnabledWebApplication1._Default.Slider1_TextChanged(Object sender, EventArgs e)
however, why is it that the Slider1_TextChanged event fired even even after during page_load, the page was told to do a response.direct ?? shouldn't the entire page have gone through a full-page refresh life cycle ? why did it continue on to attempt to raise the Slider1_TextChanged event?
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Apr 20, 2010
im tryin to create a login form.
and am receiving the following error:
Object reference not set to an instance of an object
[Code]....
and heres my aspx page:
[Code]....
Stored procedure:
[Code]....
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Dec 23, 2010
this works fine on my local site but as soon as i upload the site to my live server i get stem.NullReferenceException: Object reference not set to an instance of an object
on the first line of this:
if (!Page.User.Identity.IsAuthenticated)
{
pnlSignIn.Visible = true;
pnlSignOut.Visible = false;
}
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Apr 21, 2010
can you please help me to brainstorm the possible causes of this error. I've got a paged repeater with localisation bound programitcally to an sqldatasource using a stored proc. I can post code if needs be but it's rather long. I'm looking for typical causes of this error + will make note for future reference!
erver Error in '/WebSite4' Application.
Object reference not set to an instance of an object.
Description:
An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.
Source Error:
[Code]....
Line 233:Line 234: Repeater1.DataSource = PagedResultsLine 235: Repeater1.DataBind()Line 236: doPaging()Line 237: End Sub
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Feb 1, 2010
I am trying to get the value of the id field in my gridview but I keep coming up with this error when i do selectedValue or selecteIndex
Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.
How do I get that id? What I am trying to do is when the user select that link it will delete that information from the database. Here's my code:
[Code]....
[Code]....
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Mar 6, 2010
I'm new to programming in ASP.NET, but I'm making my way through Wrox's Beginning ASP.NET 3.5 in C# and VB.NET.
I'm at a section where I'm creating a BasePage. I successfully created a BasePage by creating a new class file in my App_Code folder called BasePage.cs with the following code:
[Code]....
If I run that code everything works out fine. The page loads and all is well. But, if I try to do the same thing to a page that uses my MasterPage.master file, I get the following error:
Object reference not set to an instance of an object.
Description:
An unhandled exception occurred during the execution of the current web request. review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.
Why is that? In the example code from the book (that also uses a MasterPage.master file), everything excutes and runs just fine. But in my test, I get the above error. I've tried comparing my pages to the books included source pages, but I can't find any differences.
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Apr 19, 2010
In the same Code behind file I have:
// This works
Label lblTopNavBarInfo = (Label)Master.FindControl("lblTopNavBarInfo");
lblTopNavBarInfo.Text = "Currently Serving: + FirstName + " " + LastName ;
// This compiles but throws an error in the browser
LinkButton lnkBtnProductsOwned = (LinkButton)LeftNav_CustServ1.FindControl("ProductsOwned"); // The Control is visible
lnkBtnProductsOwned.Enabled = false; // Error: Object reference not set to an instance of an object.
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Nov 2, 2010
I have a website written in C# that was running fine on one server. We moved it to another server and have a couple issues. I am mainly a VB.NET coder but can do a few things in C#. This is not a project - it is a website and can open it in VS2008 no problem. This is an admin site for the whole website where the user can add customer comments, etc. When logging in, it works fine. I can go to one of the admin pages after logging in and works. If I go to two other different pages, I get this error:
Object reference not set to an instance of an object.
[Code]....
It turns out this is in the main.master page and it is used by the other pages that load fine. The ApplicationTitle variable is set right in the web.config file and like I said, it shows on the other pages.
My question is why would this code work fine for some pages and not two others? All of these admin pages are under a folder called Admin and the web.config file is in the root folder of the website. Its almost like these two pages cannot see the web.config file in the root folder? Why would that be if thats the case?
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Aug 19, 2010
We have an applicaiton that was converted to the new framework using the wizard in Visual Studio 2008. When we install the applicaiton in production and change the iis settings to use the 2.0 framework we start to see these errors in the event viewer on the web servers. We are using SQL Server Session State and have 3 web servers in a load balancer. Object reference not set to an instance of an object.</Message><StackTrace> at System.Web.SessionState.SessionStateModule.PollLockedSessionCallback...
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Apr 16, 2010
I have a webservice, it has few webmethods. when i create a client proxy and invoke the methods to check its response, i am getting this error. Can someone tell me what things can i check to know the cause of this? The error is not saying much hence blocked on this.
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Dec 22, 2013
I am trying to implement the code URL...I have a database table with Integer type.Here is the running code line: Code in GridView:
<asp:TemplateField HeaderText="RegionNavn">
<ItemTemplate>
<%# Eval("RegionNavn")%>
</ItemTemplate>
<EditItemTemplate>
<asp:Label ID="lblRegionNavn" runat="server" Text='<%# Eval("RegionNavn")%>' Visible = "false"></asp:Label>
[code]...
On Edit Click, the DropDownList in the GridView brings the previously selected value.On Update Click, the error is: "System.FormatException: Input string was not in a correct format."
dCmd.Parameters.Add("@KystverketRegionID", SqlDbType.Int).Value = int.Parse(ddKystverketRegionID.SelectedValue);
When I use the following code:
ddlRegionNavn.DataTextField = "RegionNavn";
ddlRegionNavn.DataValueField = "RegionID"; // from RegionNavn to RegionID
On Edit Click, the DropDownList values in the GridView is not firing and the following error shows.Object reference not set to an instance of an object. How to implement the code when having a value of type Int ?
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