MVC :: Passing A Collection Of Objects To The View?
Apr 16, 2010
I'm trying to pass a list of items from a LINQ query to a View, but I'm having trouble figuring out how to resolve a type issue. Here's the error:
The model item passed into the dictionary is of type 'System.Data.Linq.DataQuery`1[Project.Models.Diagnostic]' but this dictionary requires a model item of type 'Project.Models.Diagnostic'.
The issue seems to originate with this code from my Controller:
[Code]....
I tried changing the IQueryable<Diagnostic> to var and got the same error. Also played around with something like:
[Code]....
But then VS2008 says that diagnostics could never be null, and that's may not the best (or even valid) way to do it.
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Sep 14, 2010
I have been trying to design a form, which uses a view model that contains an object array. I want to set up this form so that when the submit button is clicked, all the members of the array are updated. Here is my code:
The class definition of the array element:
[Code]....
The problem is that when I clicked the submit button, none of the luSubject objects in the array Subjects got updated. But if I set up some initial values for the members of the luSubject objects, for instance, set the Name field to be "Maths" in the constructor of luSubject class, then it got displayed on the text box when the form page was loaded. This suggests that this form could display the data in the array, but cannot update it.
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May 17, 2010
I have a view which takes two objects: booking and list of reasons for canceling that booking.I have two classes: clsBooking, clsBookingCancelationReason I can read both objects in my view - no problems there. After I read the objects, I display the booking details and I generate a list of cancelation reasons in the following way:
[Code]....
The code above generates a list of cancelation reasons.How do I pick up the selected ReasonId from the list?
I need to generate a link that will contain the bookingId and the selected reason for canceling the booking.I can get the bookingId out easily since it's stored in the Model...but how do I go about the selected ReasonId?
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Sep 2, 2010
I would like to pass List<SelectListItem> (not selected item but the whole "List" object) back to controller.
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Nov 1, 2010
I am trying to send json data from view to controller action. But the issue is the data is not populating in the action parameter List<Score>.
View Model:
public class Score
{
public int QuestionId { get; set; }
public int PrevAnswerId { get; set; }
public int CurrAnswerId { get; set; }
public string CurrAnswerName { get; set; }
}
Json Data look like:
[
{QuestionId:1, PrevAnswerId:3, CurrAnswerId:3, CurrAnswerName:'Known to Broker'},
{QuestionId:2, PrevAnswerId:7, CurrAnswerId:7, CurrAnswerName:'Completed'},
{QuestionId:3, PrevAnswerId:10, CurrAnswerId:10, CurrAnswerName:'Report'}
]
On window load, I will construct the Json object using "eval()" function and do some operation in the data before its save. On Save Click, I will call the action through the ajax call.
$.ajax({
url: url,
type: "GET",
dataType: 'json',
data: {score: ScoreJson},
contentType: "application/json; charset=utf-8",
success: function () {
alert("succes");
},
error: function () {
alert("error...");
} });
Action:
public ActionResult SaveScore(List<Score> score)
{
// do something...
}
But here score comming as collection of 3 elements with zero(for interger property)/null(for string property) values. When I checked in the request I found the data in "parama" property like.
"Score%5b0%5d%5bQuestionId%5d=1 &Score%5b0%5d%5bPrevAnswerId%5d=3 &Score%5b0%5d%5bCurrAnswerId%5d=3 &Score%5b0%5d%5bCurrAnswerName%5d=Known+to+broker&
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Aug 5, 2010
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UserController
[Code]....
UserRepository
[Code]....
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Jan 22, 2010
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[Code]....
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Dec 30, 2010
I am using ASP.net to retrieve data from a Lotus notes DB using OLEDB connection. I use a ADOrecordset to read the values. When I open the ADo connection, I would like to store each record being read in a custom object and thereby create a collection of custom objects as ADO connection times out when kept open for long.
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Feb 20, 2011
I want to be able to update a model and all its collections of child objects in the same view. I have been referred to these examples: http://haacked.com/archive/2008/10/23/model-binding-to-a-list.aspx and http://blog.stevensanderson.com/2010/01/28/editing-a-variable-length-list-aspnet-mvc-2-style/ .
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[Code]....
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Dec 16, 2010
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Feb 12, 2011
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[code]...
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[code]....
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How to use $.ajax(..) JSON to invoke asmx webmethods that have 'by ref arguments' for custom classes/objects? Is it possible?
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[code]...
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I have an Edit form that utilizes the following ViewModel:
[Code]....
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Apr 9, 2010
We need to create a simple web service in ASP.NET that can be called from PHP or other languages. This in turn will be used to update records in a database for an item submission.
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Jan 1 2009, ABC
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Mar 24, 2010
I'm playing around with a asp.net page that's using the IScriptControl interface to pass data from the code-behind to the custom javascript object running on the browser.I'm passing a number of properties via IScriptControl.GetScriptDescriptors(), and they're all working fine, except for one.That one is a class derived from System.Collections.Generic.Dictionary<>. And even that one has been working for me, so long as the elements in the collection were scalars - ints, doubles, and strings. But when I tried to pass a member of a class, it showed up as a null object in the javascript. The class in question is marked [Serializable]. I changed it to a struct, and got the same behavior.It looks as if the serializer used in IScriptControl does a shallow copy.
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Jan 21, 2010
I have an application that uses DataContracts/DataMembers and Serialization to store information entered in a tab control. There are 8 tabs in the control (therefore 8 aspx pages). The final tab is used to write the information to disk.I am trying to understand: When should serialization be used in a web app? The objects are stored in memory not on disk. Is this another means of passing objects between aspx pages? If so when should serialization be used vs. session objects? How long is the serialized object retained in memory?Can I get a simple example of how to serialize in one page and deserialize the object in another page?I've read many blogs regarding serialization but have yet to find a simple example and none of them explain when serialization should be used vs. session objects?
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Mar 30, 2010
I'm trying to use an ObjectDataSource's SelectMethod() to retrieve a result set from a sql server database to populate a data table with various stored procs that have any given number of parameters. My approach is to pass an object which contains the stored proc name and information about its parameters into the SelectMethod(). My issue is that I don't know how to actually set the default value. Here is the code I have so far:
ObjectDataSource1.DataObjectTypeName = "WebApplication1.Children";
ObjectDataSource1.TypeName = "WebApplication1.Children";
ObjectDataSource1.SelectMethod = "Select";
Parameter odsParameter = new Parameter() { Name = "storedProc", Type = TypeCode.Object };
// How do you set the default value to reference an object?
ObjectDataSource1.SelectParameters.Add(odsParameter);
namespace WebApplication1
{
public class Children
{
public DataTable Select(object storedProc)
{
// do stuff here and get db values.
}
}
}
The default value of a Parameter object is a string type. Does anyone know how to set the default value with an object or how I can pass an object into the SelectMethod?
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Mar 23, 2010
What I'm trying to do is rather basic, but I might have my facts mixed up. I have a details page that has a custom class as it's Model. The custom class uses 2 custom objects with yet another custom object a property of one of the 2. The details page outputs a fair amount of information, but allows the user to post a comment. When the user clicks the post button, the page gets posted to a Details action that looks something like this:
[AcceptVerbs(HttpVerbs.Post)]
public ActionResult Details(VideoDetailModel vidAndComment) { ....}
[Code]....
The only fields on the form that is posted are CommentText and VideoId. Here is what the VideoDetailModel looks like.
public class VideoDetailModel
{
public VideoDetailModel()
{
[Code]....
I suppose if I added more form fields for the properties I need, they would get posted, but I only need 1 form entry field for the CommentText. If I could get the same Model objects value that were sent to the page to post with the page, it looks like the solution is rather simple. I think using the RenderPartial in the middle of a form is problematic somehow to how the form gets written in html. I can't really put my finger on why things went bonkers, but if I do my RenderPartials before my form and then begin my form with the text entry field and the hidden VideoId, the default ModelBinder works just fine. I was beginning the form, writing the hidden VideoId, rendering several partial views, create my CommentText field, and then closed the form out. The CommentText field would get bound just fine. The hidden VideoId would not. Maybe I missed a rule somewhere about using RenderPartial.
For completeness, the partial view I was rendering took a Comment object and just wrote out it's CommentText data. Several of these objects would exist for a single Video object. All of this data was in a custom type and passed into the View (the main view) as it's Model. This partial view did not have a form and did not have any data entry fields.
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Aug 6, 2010
I've got problem with my app .
I've got such classes (this is some kind of tree structure):
[Code]....
[Code]....
in Index() action i've got this piece of code
[Code]....
[Code]....
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Jan 10, 2011
I have a partial view that has only a dropdown, i have called this partial view from a view. I can able to pass the model to this partial view and it renders successfully. However when some user selects a particular text from the dropdown, the corresponding value should be passed to view and it should be displayed in the label in view.
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Mar 7, 2011
mvc-ers in the Model i have a collection of Employees (EMPLOYEE_ID,
FIRST_NAME,
LAST_NAME,
MOBILE)
and i want to send particular fields from it to the view so in the Controller i write this code
[Code]....
how can i retrieve the collection in the view, should i create a class contains (e.EMPLOYEE_ID, Employee_Name)
and cast ViewData["Employees"] to it, or there is a trick?
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Mar 2, 2011
I have say class/ojbect one which I am returning as details. But then there is a second class that is related to the first that I want to list (and have an option to look at the details). How do I get return both of those?
Example is like in an item as the main piece but there may be details or other items that are related to the main item. I will select them with a linq query but then how do I return them to the same view?
Do I need to have some sort of partial or other form to display the second object type? I don't see where returning the view I can return both.
My thought for right now is to create a new class that contains both of the object types but I know there has to be a better way.
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