MVC :: ValidationAttribute.IsValid - ValidationContext Always Null?
Feb 17, 2010
I'm using ASP.NET MVC 2 RC 2 (verified, the DLL has been signed on Friday, 29. January 2010 7:14:16 pm).
I created a custom validation attribute, which is described here (blog post is in German, however the code is not).
The problem is: that all works fine in theory (and unit tests). But by executing it in "the real world", which means firing off a form post to the server, it doesn't work. The commited validationContext is always null.
Is that a known issue? I would call that a real bug because it makes it impossible to use that method. And by using the other one I don't have access on the given context.
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Similar Messages:
Apr 9, 2010
I have an CustomViewModel that is composed of three layers of objects.
The first one is to store and populate lists to be used in dropdowns.
The second one is to store additional propperties that I want.
And the third one is the model itself.
I create the view using View(new Layer(model))
And at the post i have ActionResult .... (Container container)
I made this architecture because i was having a lot of problems with model binder and enums...
So when i post to the form and the ModelBinder checks the validation attributes, the IsValid operation at the attribute X applied to the model class has its parameter value as null.
This behavior doesn't happen if I Just use the simple model to create and post the view.
What I have to do to get this work ?
I made a few changes to the AccountController to use it as sample here, here is the code:
[Code]....
Just change the register page to inherits from RegisterModelLayer.
When I post, the value parameter at the IsValid function at the PropertiesMustMatchAttribute class is null;
As a consequence i can't validate and get an null exception maybe.
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Mar 17, 2011
explain to me the difference between these two? I'm new to MVC and can't seem to find an explanation anywhere.
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Aug 17, 2010
I have cause validation true on button. And I am checking the Page.IsValid in c# code. But its always returning false value?
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May 21, 2010
I am working in an ASP.NET MVC Application. I have a view model as follows:
[code]....
From UI Perspective user can enter date as mmddyyyy. And when user enters in such format 01012001, my ModelState.IsValid code piece in controller returns false. When I did a quick watch in ModelState, I see an error for the propery "SampleDate", saying "The Value 01012001 is not valid for SampleDate".
In my modelbinder, during the OnModelUpdated event I tried to format the value 01012001 to 01/01/2001 and assigned it back to SampleInterestViewModel.SampleDate thinking that ModelState.IsValid might return true without that error. But still ModelState.IsValid is false and I when I looked in to the ModelState dictionary, this particular property still has that errors in its collection.
Lastly I tried to format 01012001 and update the value 01/01/2001 directly to the Property SampleDate in the ModelState dictionary. But still ModelState.IsValid is false showing the same error for the SampleDate property. Can't figure out why ModelState.IsValid works and how and when it gets set to false.
If the User enter 01012001 in the UI, I still need to format it in the modelbinder to 01/01/2001 and make sure that ModelState.IsValid it true so that the rest of my controller code can work as expected. In the UI I am doing an AjaxSubmit to post the sampleDate value.
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May 19, 2010
Is it necessary to do a ModelState.IsValid check at the top of every action? It seems that it is since the default model binder could make it invalid depending on the action parameters.
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Feb 9, 2011
The latest MVCSaffolding package uses "if (ModelState.IsValid)" prior to saving changes. In the past I have seen TryUpdateModel... used.
Is there a best practice?
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Feb 25, 2010
I'm using CustomValidator with Page.IsValid=false but for some reason the FormView control still process the insertion.
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Mar 18, 2011
I am using a wizard control in which I have a next button that has causes validation = true. I also have a checkbox that when changed, in the event handler, I set causes validation = false for the next button. When that button is clicked - I get the following:
Page.IsValid cannot be called before validation has taken place. It should be queried in the event handler for a control that has CausesValidation.
Here is the code:
protected void chk_CheckChanged(object sender, EventArgs e)
{
CheckBox chk = (CheckBox)sender;
ImageButton ibtnStepNext = (ImageButton)(this.WizardSummaryTemplate.CustomNavigationTemplateContainer.FindControl("StepNextButton"));
ibtnStepNext.CausesValidation = (!chk.Checked);
}
What would be the recommended solution to disabling validation for the next button so I don't see this error?
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Jul 26, 2010
I want to pop up a message box when page.isvalid = false. How to do that?
[code]....
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Feb 24, 2011
Model is coming up as Invalid Scenario is I have a custom ViewModel and certain fields don't show up on the screen (like Id & some computed fields etc..) so when the data gets posted back the Model.IsValid() comes to false Q Do I have to pre init these fields when I do create
ActionResult CreateOrder(int customerID)
{
var order=new OrderViewModel();
//shall I init the fields which are not being keyed in by the user?
}
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May 21, 2010
In our code, we have to give the users a list of printers to choose from. The user then chooses a printer and it is checked to verify it is valid before printing. On a windows 2003 server with IIS 6, this works fine. On a windows 2008 server with IIS 7, it fails each time impersonate is set to true.
PrinterSettings printerSetting = new PrinterSettings();
printerSetting.PrinterName = ddlPrinterName.SelectedItem.Text;
if (!printerSetting.IsValid)
{
lblMsg.Text = "Server Printer is not valid.";
}
else
{
lblMsg.Text = "Success";
}
Each time this code is run, the "Server Printer is not valid" displays, only if impersonate is set to true. If impersonate is set to false, the success message is displayed. The impersonation user has full rights to the printer. Is there a way to catch the actual reason the printer is not valid? Is there some other 2008 setting I should check? update I found that IsValid fails when the IIS7 application pools has "Enable 32-bit applications" is checked. This must be checked b/c we are using a 3rd party tool to print with, and it is a 32-bit application. It is not currently part of this test, so right now it is not causing this error.
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Oct 14, 2010
I am a bit baffled... I had my validation working fine till I added a validation group to it. Can someone tell me what i might be missing ? I'm at a loss... As I have another page doing the same thing and it works fine. Page.isValid always comes back as true.( I am just clicking on the button to make all the validation fire off.... )
[Code]....
[Code]....
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Feb 4, 2011
[Code]....
The following setup seems to work fine on the client side, however when I post back and check Page.IsValid, the value is false. I also looked at mevDate.IsValid and it's false. It seems that setting the CultulreName on the MaskedEditExtender is sufficient to get the MaskedEditValidator to emit the correct JavaScript, but on the server side of things it doesn't work. When I flip CultureName to "en-US" everything works as expected.
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Feb 10, 2011
I try to create a asp.net mvc 2 application.
My DropDownList won't be validated!
I have a core model class called Animal with some attributes and the same for the class Genus. These classes are mapped to nHibernate.
[code]....
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Dec 6, 2010
I have setup my business object to have a create_date and edit_date members both datetime datatypes. My company want to display the create_date and edit_date fields in a gridview for each transaction. The problem i have is that after insterting a record it will have a valid create_date but no edit_date and when displayed in the gridview it defaults to datetime.minvalue (My default). How on earth do i show an empty field in my gridview for a null datetime field in the database?
I am using similar architecture to the Imar Spaanjaars example of a tiered solution. With a few small tweeks it has worked well for me for ages. I am passing a List<Database> to my object datasource which connects to my gridview.
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Oct 2, 2010
I have 2 table Table A, Table B.
Table A - Parent Table
ID - Uniqueidentifier not null(PK)
Table B -Child Table
ID - uniqueidentifier null(FK, TableA)
I have a stored procedure to insert data into Table B, but when I tried to insert a null value into column ID of table B, this error came up:
The INSERT statement conflicted with the FOREIGN KEY constraint "FK_tableB_tableA". The conflict occurred in database "database name", table "table A", column 'ID'.
The statement has been terminated.
The insert statement in asp.net is like so:
sqlcommand.parameter.add(New Sqlparameter("ID", Nothing))
I am guessing adding nothing to the null value column is the problem, but i don't know how to fix it... The INSERT statement conflicted with the FOREIGN KEY constraint "FK_tableB_tableA". The conflict occurred in database "database name", table "table A", column 'ID'.
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Mar 18, 2010
I have a problem with a SessionVariable. I will explain what is happening:
1. From the default.aspx I send Session["LoginByAdmin"] = "Dummy"; and then redirect to this page where I have the code below. So the Page_Load sees that this Session["LoginByAdmin"] != null and enter this page. This works fine !
2. In the Page_Load, I later fill a ListBox1 with foldernames.
3. With Button1_Click1, I will now delete the choosen Folder in the ListBox1 wich works fine the first time and the ListBox updates the new existing folders in the ListBox. (I have wrapped this inside an updatepanel)
The problems comes now when I try to delete a choosen folder in the ListBox1 the second time in a row. When I select a Folder in the ListBox1 and now Press Button1, I will be redirected to "Default.aspx". This meens that this code is running: (That meens that Session["LoginByAdmin"] == null and I have not set this to null anywhere. This is my big question how this variable can be = null here?
if (Session["LoginByAdmin"] == null)
Response.Redirect("Default.aspx");
break;
[Code]....
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Feb 24, 2010
I am using dropdownlist in my view page with some values which will display corresponding ID(primary key of other table) in my database.If i leave my dropdownlist blank and save it in database then its showing null parameter error. Can you explain how to use this reference type to overcome this error
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Nov 6, 2010
i am using the following in a stored procedure.
[code]....
[Code]....Handling NULL...Field not updating when NULL?
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Jan 5, 2011
In my code behind, I have the following code that I want to insert a null value for a parameter. Instead of doing that, it is adding the word "NULL" to my database. What am I doing wrong?
dsRevealedByCR.UpdateParameters.Add("txtGrantor","Null")
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May 17, 2010
m getting this error again and again. i m also using the ajax modalpopup extender in my page ..
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May 13, 2010
My site was woking fine, now i noticed that i get an error "Microsoft JScript runtime error: 'null' is null or not an object" when i checked the view source, i saw the following system generated code
<script type="text/javascript">
var Page_ValidationActive = false;
if (typeof(ValidatorOnLoad) == "function") {
ValidatorOnLoad();
function ValidatorOnSubmit() {
if (Page_ValidationActive) {
return ValidatorCommonOnSubmit();
}
else {
return true;
}
WebForm_AutoFocus('txtMailAddress');// --> IS THIS RIGHT???? out side the braces???
</script>
</form>
</body>
</HTML>
and a reference to this line below
<IFRAME id="__hifSmartNav" name="__hifSmartNav" style="display:none" src="/m2qa/WebResource.axd?d=fvL5WUdiCo1B4KvdiJfkfg2&t=633546432952161750"></IFRAME>
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Jan 21, 2010
here is my code for selectiong some records from db table
string strSql = "select * from mtblNBD where SentTo=@SentTo and InternalStatus Is NULL order by DeadLine desc";
SqlCommand com = new SqlCommand(strSql, con);
com.Parameters.Add("@SentTo", SqlDbType.NVarChar, 50).Value = (string)Session["uname"];
here I am using parameters for SenTo field but not for NULL so it is ok... or should I use parameters for this field where value is NULL , if yes then how can I use parameter for this
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Jul 30, 2010
I've been working on building a back end on an access database that allows users to search records using a web search box. I've been able to successfully set up simple search query's but have run into trouble where multiple criteria with "AND" statements (OR statements would return too much to be useful). My problem is this, when all five text boxes are filled out the query returns records no problem, but if even one is left blank i get nothing what so ever. Is there any thing I can do in either SQL or VB to either ignore null values entirely or convert them to wildcard values?
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