Validate A Single Property With The Fluent Validation Library For .Net
May 17, 2010
Can you validate just a single property with the Fluent Validation Library, and if so how? I thought this discussion thread from January of 2009 showed me how to do it via the following syntax:
validator.Validate(new Person(), x => x.Surname);
Unfortunately it doesn't appear this works in the current version of the library. One other thing that led me to believe that validating a single property might be possible is the following quote from Jeremy Skinners' blog post:
"Finally, I added the ability to be able to execute some of FluentValidation's Property Validators without needing to validate the entire object. This means it is now possible to stop the default "A value was required" message from being added to ModelState. "
However I do not know if that necessarily means it supports just validating a single property or the fact that you can tell the validation library to stop validating after the first validation error.
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Jan 22, 2011
In my model, it seems that Validate() is only called AFTER both properties pass validation.
public class MyModel : IValidatableObject
{
[Required]
public string Name { get; set;}
[Required]
public string Nicknames {get; set;}
public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
{
if(Nicknames != null && Nicknames.Split(Environment.NewLine.ToCharArray()).Count() < 2)
return yield result new ValidationResult("Enter at least two nicknames, new [] { "Nicknames" });
}
}
When a user enters a single line of text in the Nicknames text area but leaves the Name text box empty, only the Required error message for the Name property is displayed. The error message that should be displayed from the Validate() function never shows up.
Only after entering a name in the Name text box and some text in the Nicknames text is the Validate() function called.
Is this how it's supposed to work? It seems odd that a user is shown an error message on a subsequent page when the error is being caused on the current page.
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Jun 23, 2010
I've created a service (class library) that uses a few other class libraries within its solution.
When I try to use this service dll in a website the system requires me to also deploy all of the child dlls of the service to the website.
I'd like to combine the service dll and all of its child dlls into a single dll.
I found a reference to "ILLINK" on the web as a tool that's supposed to enable this.
Is there a tool built into the .NET framework that will do this? It seems like it would be a not-uncommon requirement.
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Apr 6, 2010
i have a field DOB, i want to validate only this field when i give causes validation True for this field, What happens is it validates all the fields in the page are validate. Can we assign validation for particular fields.
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Sep 13, 2010
I have a question about validation. Basically how the MVC framework is setup it can use DataAnnotations. It calls TryValidate in a controller which does some other black magic, and poof, you have a ModelState with validation results. Now to extend this validation you can create a validator and then provide custom validation on both server and client side. Here is the problem... what if you dont want to hard code all of the validation in the classes? I would like to use what Microsoft has already provided in the Enterprise Library [URL]for validation. I will be using both DataAnnotations and configured rule sets. Of course I could just put the code in each action, but that is so 1999. As I see it the MVC framework falls short by not allowing us to use the config for such things. Why is the validation so specific for MVC? Why could it now have used the Enterprise Validation? I wrote my own abstract controller and put in Enterprise Library validation and it worked GREAT!!! So why am I here? Well, surly there must be a better way... do I really have to write my own controller abstract class to change the validation?
So if you think you know how to solve this problem, you must provide a solution that does this:
Uses DataAnnotations AND Configuration RulesCan validate the SAME in a console application (could really be any non-web app) and MVCI do see that MVC 3 adds a little more support for validation which was really needed. It supports IValidatableObject, which allows you to validate the whole Model... its nice, but now we have 3 ways to do that same thing... granted the former 2 (DataAnnotation on the class, and a Validator for the DataAnnotation) could not pass the error to the correct place in the view. Now if we could just support all of this validation in a place what any type of application could use it. In my use case I will run validation on the MVC app, perhaps some other apps, and on an ESB.
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Nov 22, 2010
How to validate two textboxes at single button click using vb.net ?
it shows an error :
Protected Sub Button2_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button2.Click
If TextBox1 = "06:00:01 PM" & TextBox2.Text = "02:00:01 PM" Then
MsgBox "Submit"
End If
End Sub
Whatz wrong with my this code ? I wanna validate two checkbox using if statement ... on Button click
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Jul 24, 2010
i am working on asp.net, for example in a form they are 10 text boxes i want to validate each textbox if it is empty it should display a alert message.
how to achieve this by using a single javasript method. can we pass texbox as an argument into javascript how to achieve this
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Jul 26, 2010
I created a Global Resource file for Error messages and I am attaching the associated message to the validator control as following.
<asp:RequiredFieldValidator ID="RVTest"
CssClass="ErrorMessage" runat="server"
ErrorMessage="<%$ Resources:ErrorMessage, RequiredFieldTestKey %>"
ControlToValidate="ReqFldTestTextbox"> </asp:RequiredFieldValidator>
This is working fine.
Now I am planning to move all the Global Resources to a different library let say MyResourceLibrary and created a resource file with name ErrorMessage. I have added the reference of the library to my ASP.NET project and trying to acces the message from my library as follwong.
<asp:RequiredFieldValidator ID="RVTest"
CssClass="ErrorMessage" runat="server"
ErrorMessage="<%$ Resources: MyResourceLibrary.ErrorMessage, RequiredFieldTestKey %>"
ControlToValidate="ReqFldTestTextbox"> </asp:RequiredFieldValidator>
But this is not working.
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Feb 18, 2011
How to validate a group then render a single error message?
Below returns error message on each field.
[code]....
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Mar 16, 2011
I'm trying to extend the requirefieldvalidator to take a new property and validate regularexpressions also. I know I can use the RegularExpression control but then i need 2 controls so i want to eliminate it so i only have to use two controls. There are also other features i want to make which include me extending it. My problem is i don't know what to override - i tried the Validate() but i get "cannot override inherited member 'System.Web.UI.WebControls.BaseValidator.Validate()' because it is not marked virtual, abstract, or override" and i understand the EvaluateIsValid() is for validating the control not what is in the control.
[code].....
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Oct 4, 2010
I am using javascript to validate user input on my aspx page. I am easily able to validate textboxes and dropdown list for differenet scenarios.
Now, on one of my dropdown lists (for country), I need to check if it is an allowed country or not for a particular service. I have stored the valid country list in a static property. Is there a way to validate my dropdownlist selected value against that static property?
function validateService(source, args)
{
var country = document.getElementById('<%= ddDestCountry.ClientID %>');
var service = document.getElementById('<%= ddService.ClientID %>');
// Get allowed country list from my static class
var countryList = document.getElementById('<%= StaticProperties.EUCountryList %>');
if (service.value == "P")
{
// I want to do something like this
if (!countrylist.Contains(country.value))
{
args.IsValid = false;
}
else {
args.IsValid = true;
}
}
return;
}
Update(Additional Information): The static property is read-only so it cannot be tampered with from the page.
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Mar 13, 2010
VWD 2008 Express. Visual Basic.
I have two validationsummary controls on my page for aesthetic reasons. Each control is assigned a validation group (StudentInfo and Grades). validation controls in the upper part of my page are in validationgroup StudentInfo and those in the bottom part of my page are in validationgroup Grades.
However, I only have one "Save" button control that causes validation. I want the Save button to validate both groups of controls, but it appears to only allow one Validation group to be specified in its properties.
Is there a way to have a button cause validation for both groups?
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Mar 14, 2011
I have a Form like this.
UserID has to be validated when user clicks "Check Availability" and "Submit"
Hence "UserID" required field validator has to be assigned two grops.
As if now it is assigned only Group1
[code]....
I have already gone through How to validate against Multiple validation groups?
which talks about validating Group1 and Group2 when user clicks "Submit" which is a good alternate solution.
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Mar 24, 2010
I have two validation groups: parent and child
I have an add button that needs to only validate the child validation group which is easily done. The save button needs to validate against the parent and child validation groups, both client side and server side. I think I know how to do it server side by calling the Page.Validate("groupname") method for each group, but how can it be done client side?
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Jan 30, 2011
I got a Category model and it looks like this
[Code]....
My problem is that when i do a tryupdatemodel it validate the ParentCategory aswell, is it really suppose to do that? How could i avoid this, I tried [Bind(Excluede = "ParentCategory)] in the ActionResult but with no luck. I have looked all over the place with no luck everybody just got the Id problem.
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Dec 3, 2010
Before I get to the question, let me give a bit of background. I'm trying to develop a custom caching mechanism that I can apply to custom built user controls. (Please be aware that I know that there are some built in caching mechanism in .NET) Depending on certain flags set declaratively in the mark-up the control should load a cached version of its previously rendered content or execute normally (and if certain flags are set it should generate a cache of its content for next time it loads). I would like to be able to pass certain flags declaratively in the mark-up and being able to check their value at Page Init and, depending on the flag value, determine whether the control should load a cached version or not.
<uc:MyUC ID="N1" runat="server"
CacheProp='<%# SomeEnum.A | SomeEnum.B |SomeEnum.C %>'
PropA='<%# this.SomePropA %>'
PropB='<%# (this.SomePropB %>'
PropC='<%# this.SomePropC %>'
/>
The problem that I'm facing is that as far as I'm aware I can only get the value of the properties declaratively assigned in the mark-up if I called the DataBind(). However I'm faced with two problems: Firstly calling this.DataBind() from within MyUC will trigger the binding of all its child controls which would defeat the purpose of the cache; also all user controls have been built so that they will not call DataBind() before the LoadComplete event has fired, so to make sure that the parent controls they live in has done its initialisation and has computed the properties that are declaratively passed to the child user control (ie PropA, PropB, PropC).And now the question: is there a way to bind the CacheProp property so to retrieve its value without data binding all other properties and without triggering the data binding of all its child controls?
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Dec 25, 2010
When I use a compare validator, datatypecheck="String", and try to enter the following code to test, the comparevalidation doesn't catch it in time, and instead the browser pops up with an error saying the text is not allowed.
Will JavsScript validation catch it?
<link href="../Styles/StyleSheet.css" />
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May 17, 2010
there I am using xval for the first time, it seems to work fine for required fields, However I am having some issues first of all it does not seem to validate booleans and also client validation is not working for me, this is not a major issue for me, the one that I really need to work is the stringlength property. It seems to do something because the form is not posted when the string length is exceeded, however no error message is displayed to the user which is obviously not what I want, has anyone been able to do this successfully?
My model goes like this
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.ComponentModel.DataAnnotations;
namespace PitchPortal.Core
{
public class DocumentMetadata
{
//[Required]
// public bool visibility { get; set; }
[Required,StringLength(10, ErrorMessage = "title is too long")]
public string title { get; set; }
[Required, StringLength(10, ErrorMessage = "description is too long")]
public string description { get; set; }
[Required, StringLength(10, ErrorMessage = "summary is too long")]
public string summary { get; set; }
[Code]....
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Nov 2, 2010
How Can We Check The Validation Of RadCaptcha From Code Behind - With Custom Validator(ServerValidate) / WithOut Using And Setting ValidationGroup ?
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Mar 10, 2011
I'm working on a very dynamic site build at the moment. What I'm trying to do is creating something like a survey that can be created dynamically from a control panel. In the control panel you add input fields (these are saved in a database), what the user then see is a form that I generate from the database. So if I add 3 input fields to the database the survey will contain 3 fields. If I add 20 fields the survey will have 20 fields.
Now my problem is that I want to validate these fields, and I would like to be able to hook me in with the standard validation flow. I can't create a Model with validation rules since the number of fields and their names are dynamic the only thing I know is what kind of data that is expected in every field (this rule is found in the database). In an ordinary case I would get the automatic highlighted fields that are not valid and so on thanks to the built in validation flow with ValidationResult and so on.
So the question now is can I somehow simulate parts of the validation and then hook me back in with the validation result, and if not valid, the form prints the error messages and fill the fields with the data that was given?
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Jul 23, 2010
i have imported data from excel to datatable but i need to validate port no column which should
allow only numeric value and also i need to check the single quotes and need to replace to double quotes.
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Aug 10, 2010
am trying to use JQuery validation plugin to validate some fields on one page.at page also has a link button which submits the page to server. Now the problem that I am facing is jQuery validator doesn't fire when I submit the page with that link button. If I change the link button to normal button or image button then validation works fine. I can't change the control on the page and have to use the link button.
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Mar 4, 2010
I am using below code to validate interger and float in asp.net but if i not enter decimal than it give me error
<asp:TextBox ID="txtAjaxFloat" runat="server" />
<cc1:FilteredTextBoxExtender ID="FilteredTextBoxExtender1" TargetControlID="txtAjaxFloat" FilterType="Custom, numbers" ValidChars="." runat="server" />
i have this regex also but its giving validation error if i enters only one value after decimal. [URL]
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Mar 28, 2011
how can i validate a textbox with 5 number only are allow to fill in and first number must number 3. For example like 3XXXX,3YYYY (X and Y are number).
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Jan 21, 2011
i want to apply my custom validator multiple times on a single property. i am using mvc 3 unobtrusive js for validations.i have tried this solution
http://www.paraesthesia.com/archive/2010/03/02/the-importance-of-typeid-in-asp.net-mvc-dataannotations-validation-attributes.aspx , but not working for me.I am getting error like this : "Validation type names in unobtrusive client validation rules must be unique."
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