C# - Making Unity And WebForms Error - No Parameterless Constructor Defined For This Object
Sep 7, 2010
Does anyone have any good examples of how to make Unity 1.2 or 2.0 work with ASP.NET WebForms?
I thought I had this figured out, but evidently I'm missing something. Now I'm getting the error; "No parameterless constructor defined for this object". I remember getting this error a couple years ago, I and just don't remember what I did.
Obviously Unity isn't working as it should because somewhere along the way I've forgotten something.
I'm very new to Visual Studio and I am getting this error when trying to update an Oracle table from Gridview using a tableadapter datasource. I've followed the instructions in my text very closely but am at a loss as to why this error is occurring.
Details: System.MissingMethodException: No parameterless constructor defined for this object.
Source Error:
[Code]....
Stack Trace:
[Code]....
this is the stack trace error I am getting. At this point, I'm a little clueless how to resolve it.
I receive the error "No parameterless constructor defined for this object", I have read some post on this forum about this error, but i cannot get it to work.
First I incorrectly had my node defined in /shared/web.config instead of the web.config in the root of the WebUI project. I also had not correctly defined my connection string within web.config. I have pasted the proper web.config sections below:
I've set up a strongly-typed View and a controller method to save the object represented in that View. The object in question is from a class that uses named parameters with default values. This is not a database object, but rather is the intermediate object that is used for the display and user input. It gets translated into a database object in the service class. Anyway, when I attempt to save the object, I get the following error:
System.MissingMethodException: No parameterless constructor defined for this object.
This is kind of aggravating. I can add a parameterless constructor to the class, and then everything works just fine. I just don't understand why it is necessary. I'm new to named parameters with default values, but the reading and such that I've done has described that method calls with default values do not have to have a 'no-parameter' implementation. You can just call the method with any or none of the parameters specified and everything works as expected. If there is a 'no-parameter' implementation and no params are passed, then that one is used, since it is more specific than the one with default values. Is the behavior somehow different when this is used in the constructor of a class? Why would I have to include a parameterless constructor when I have all the values accounted for? Is the runtime creating an object on the fly as the save method executes, which requires this? The method is like this:
[Code]....
I'm wondering if the object is instantiated by the runtime in order to populate the method parameter, and then assigned values from the form collection. I suppose that would make sense, but I do not understand why this causes an exception. For what reason would a parameterless constructor be required?
I have no idea why my form submit is not passing the model back to the Controller action
Here is the View:
[Code]....
Heres the Controller:
[Code]....
Here is my Model:
[Code]....
By default Index, renders with an empty results set, on button press i want it to go to the "StartSearch" Action, and rerender the index with possibly non-null results set.
I have impelemented my own mvc pattern to my website , when I add desired type for my ObjectDataSource pointing to the controller class although GridView refreshes schema in designer just fine I get an error in runtime saying : "No parameterless constructor defined for this object." which is self explaining but I wonder why does it happening because I've used this pattern once and didn't have that issue , here is the bit of code that is causing this issue , what to do to keep my mvc and make it work :
I have a usercontrol which implements iwebpart and this is loaded into a webpart by adding it to the webpartmanager on the page. But i'm getting the error message "No parameterless constructor defined for this object." and i cannot find out what i'm doing wrong. The control is loaded into the webpart by:
I've created a web service , which can a method to set the user credential using Microsoft.Web.Services3.WebServicesClientProtocol. The sample code is :
<WebMethod()> _ Public Sub ClientCredential1(Of TSecurityToken As SecurityToken)_ (ByVal UserCred As Microsoft.Web.Services3.Security.Tokens.UsernameToken)
[code]....
When I run the web service it gives this error: "Microsoft.Web.Services3.Security.Tokens.UsernameToken cannot be serialized because it does not have a parameterless constructor."
i am taking data from two tables so i created one class and i constructed with two tables like this..
[Code]....
my edit post method is:
[Code]....
if i put PublisherViewModel in post function edit (ByVal aintEntityId As Integer, ByVal model As PublisherViewModel) As ActionResult. i am getting this error when post edit function called. No parameterless constructor defined for this object.
I'm using Microsoft Unity. I have an interface ICustomerService and its implementation CustomerService. I can register them for the Unity container using the following code:
If CustomerService has a certain parameter in its constructor (e.g. ISomeService1), I use the following code (I need to specify SomeService1):
container.RegisterType<ICustomerService, CustomerService>(new TransientLifetimeManager(), new InjectionConstructor(new SomeService1()));
No problems here. The problem appears when CustomerService class has two parameters (not one param as in the previous example) in its constructor (e.g. ISomeService1 and ISomeService2). It works fine when I'm using the following code: container.RegisterType(new TransientLifetimeManager(), new InjectionConstructor(new SomeService1(), new SomeService2()));The problem is that I do not want specify SomeService2() for the second parameter. I want to specify only first parameter - SomeService1(). But I get the error that I need to specify none or both of parameters. How can I specify only first parameter of constructor?
when we declared as static then we will not create the object to call the static method. then my doubt is how is call the static constructor after creating the object?can you explain cleary?
am having a class which contains user defined data type property. I have created an instance of that class. When I bind that object of that class to DetailsView it is showing all properties except user defined data type property. Here is the sample code.
public class Customer public string CustomerName { get; set; } public int Age { get; set; } public Address CustomerAddress { get; set; } } Address class looks like public class Address { [code]...
So I've got a partial in my MVC project that creates a JSON array. I want to move this chuck of code from the top of the html page body to the bottom with the rest of the JS for speed reasons. That is to say I want to store the JSON created as a string in C# and access it on the Site.Master.
I have created a object in ASP.net C# that is a collection (arraylist) of Arrest Warrant objects. How do I make that object available to multiple pages?
I am getting following error "sys.webforms.pagerequestmanager is null or not an object" in my login page.login page contains script manager tag at start and Ajax CollapsiblePanelExtender n page.
I recently converted my VS 2005 project code to VS 2008.My old code is running fine.
In ASP.Net MVC action methods can return json objects simply by returning something like so:
JSon([whatever])
How do I return a JSon representation of say List<String> with webforms either through a service or through a method in the code behind of an aspx page? This seems incredibly confusing compared to ASP.Net MVC.
XML Parsing Error: no element foundLocation: [URL] Number 1, Column 1:where as on local there is no error the code contains: protected void Button1_Click(object sender, EventArgs e) { try { SqlConnection con = new SqlConnection(WebConfigurationManager.ConnectionStrings["PintooConnection"].ConnectionString); DataSet Ds = new DataSet(); SqlDataAdapter Da = new SqlDataAdapter("Select * from Emails", con); Da.Fill(Ds); for (int i = 0; i < Ds.Tables[0].Rows.Count; i++) { Label1.Text = Label1.Text + i.ToString() ++ Ds.Tables[0].Rows[i][1].ToString() + " <br />"; SqlConnection test = new SqlConnection(WebConfigurationManager.ConnectionStrings["PintooConnection"].ConnectionString); string qry = "Insert into test values ('" + Ds.Tables[0].Rows[i][1].ToString() + "','" + Ds.Tables[0].Rows[i][2].ToString() + "','" + Ds.Tables[0].Rows[i][3].ToString() + "','" + Ds.Tables[0].Rows[i][4].ToString() + "','" + Convert.ToDateTime(Ds.Tables[0].Rows[i][5].ToString()) + "')"; SqlCommand cmd = new SqlCommand(qry, con); con.Open(); cmd.ExecuteNonQuery(); con.Close(); cmd.Dispose(); } } catch (Exception ex) { Label1.Text = ex.ToString(); } }aspx code is here: <%@ Page Language="C#" AutoEventWireup="true" CodeFile="testforconnection.aspx.cs" Inherits="Admin_testforconnection" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" ><html xmlns=[URL]><head runat="server"> <title></title></head><body> <form id="form1" runat="server"> <div> <asp:Button ID="Button1" runat="server" Text="Button" onclick="Button1_Click" /> </div> <asp:Label ID="Label1" runat="server" Text=""></asp:Label> </form></body></html>I have also tried this<![CDATA[<% Response.ContentType = "text/HTML";>but the problem is same.</textarea></p> <input type='hidden' name='ID[1]' value='178042' /> <input type='hidden' name='URL[1]' value=[URL] /> <input type='hidden' name='CAT[1]' value='ASP.NET' /> <input type='hidden' name='BOARD[1]' value='stackoverflow' /> <input type='hidden' name='P_DATE[1]' value='Jun 18 10 at 4:43' /> <input type='hidden' name='RANDOM[1]' value='oP15QfJ0c' /> <input type='hidden' name='REPLIES[1]' value='3' /> <input type='hidden' name='USER[1]' value='aziz' /> <p><input class=subject type='text' size='90' name='SUBJECT[1]' value='c# - How do you access the Source Error, Source File and Line Number of an exception to use in a custom error page?' /><select name='INDEXED[1]'><option value='1' selected>UPDATE</option><option value='2'>DELETE</option></select>Jun 18 10 at 4:43 - Replies: 3 CAT: ASP.NET<a target=_blank href="[URL]>View</a></p> <p> <textarea rows=10 cols=100 name='POST[1]' onfocus='setSelRange(this, 0, 0)'/>Basically I want to take the following:
And make it match the styling of the rest of the application. I am creating a custom error page in my C# based project and I want it to be able to show the same information that is displayed in the ASP.NET default error page. From fiddling with reflector I can see that this is generated through HttpException.GetHtmlErrorMessage() but when I try to use this in my exception it returns null.
I am getting "Sys.webforms.pagerequestmanager is null or not an object" error when calling the webpage from outlook for some client machines. In some machines it is working fine.
When I get an Object Ref error, it can sometimes be a real pain to find out which variable is causing the error (when you can't debug). Is there a way for this error to throw the classname that isn't assigned?
