[CustomValidation(typeof(TestBA.Web.GenderValidation), "IsGenderValid")]
//[Required]
public string MALE_OR_FEMALE;
test.shared.cs
[Shared]
public static class GenderValidation
{
public static bool IsGenderValid(string gender, ValidationContext context, out ValidationResult valResult)
{
if (gender == "M" || gender == "m" || gender == "F" || gender == "f")
{
valResult = null;
return true;
}
else
{
valResult = new ValidationResult("The two valid values are 'M'/'F'");
return false;
}
}
[CustomValidation(typeof(GenderValidation), "IsGenderValid")]
[DataMember()]
[StringLength(30)]
public string MALE_OR_FEMALE
{
get
{
return this._male_or_female;
}
set
{
if ((this._male_or_female != value))
{
this.ValidateProperty("MALE_OR_FEMALE", value);
this.RaiseDataMemberChanging("MALE_OR_FEMALE");
this._mil_spec = value;
this.RaiseDataMemberChanged("MALE_OR_FEMALE");
}
}
}
On the dataform this validation works perfectly.
On click of validate button on the child window (using dataform), I run a validation routine, a stored procedure - which returns a dictionary of errors. Considering the above example(assuming that stored procedure gives an error if lower case "m" or "f"
is entered or some other combination invalidates MALE_OR_FEMALE dataform field). How can I make use dictionary(KEY = MALE_OR_FEMALE, VALUE = "Value should be in upper case or something like this error message") in the code behind of this .xaml(dataform) and
achieve exact same display result(the field is highlighted in red, an error message is displayed next to the dataformfield).
Is it possible to do something SIMILAR on the code behind (do I have to write a method similar to the one in test.shared.cs)
Thanks for your response Mog Liang. You have pointed me the right direction, but I am not yet there to resolve the issue I am having.
My validations are defined in the metadata.cs (a different project TestBA.web). The .shared validations are defined in this project( a static Method IsFormLevelDataValid has all the validations for each of the each of the fields of the database.
I have a client project(TestBA) and I have done validation by calling stored procedure, which has returned a list of errors. I want to make use of this list and populate the errorsummary.
How do I call the validation(that is in TestBA.web) from .xaml.cs (in project TestBA) and send the list of errors(which has elements also) and context).
The issue is I do not know the validation error before hand. Only the stored procedure would know what data is valid. In practical business application, it is true that the business rules would change(enhancements). The business rules in stored procedure
could be modified and I should not be changing any code on the front end. I do not want to put too much of business logic on the view.
How do I call the entity level validation from the code behind(.xaml.cs)? I have the errors returned by the store procedure in an observable collection. How do I call the entity level validation, which should accept observable collection, context, entity
as parameteres.
So just to summarize the issue, you can validate your entity using a procedure stored in the database and a validation method (like the sample) on the server. Your question is how to do the same thing on the client, right?
If you haven't done so already, for the first step you should create a CustomValidationAttribute an use it at the entity level (instead of the property).
[CustomValidation(typeof(MyValidator), "IsMyEntityValid")]
public class MyEntity { /* ... */ }
Your IsMyEntityValid method can call the stored procedure directly (on the server). However, you'll find this approach will not translate well to the client. Since the stored procedure can only be accessed using a service, this means it can only be invoked
asynchronously from the client. I have not seen any solutions (or even best practices) for asynchronous validation on the client.
One alternative (which you may be alluding to) is to make some of the rules and errors used in the stored procedure available as metadata. This metadata could be shared between the client and server. The full stored procedure validation could be performed
on the server to ensure validity and an approximation could be run on the client for immediate, user-friendly feedback.
Kyle, Thanks for your response. Here is how far I have reached. On the client, on button click, I was able to call stored procedure (invoked a service) and have the errors in an observable collection (the property and error message).
I think (I may be wrong), all I need to do is somehow send this observable collection(errors), context and entity (ent) to the custom validation (.shared.cs, which could be at the entity level as suggested by you..
[CustomValidation(typeof(MyValidator), "IsMyEntityValid")] public class MyEntity {Entity ent, ValidationContext context, out ValidationResult valResult, ObservableCollection<errors>)
this is how my parent page looks like (just a reminder am trying to do validation from child window, where I can add records.
So the context of the parent and child window are the same, am I right?)
Here is the parent context
public partial class Prod : Page { public Prod() { ProdContext _ProdContext = new ProdContext(); InitializeComponent();
My validations are defined in the metadata.cs (a different project TestBA.web). The .shared validations are defined in this project( a static Method IsFormLevelDataValid has all the validations for each of the each of the fields of the database.
I have a client project(TestBA) and I have done validation by calling stored procedure, which has returned a list of errors. I want to make use of this list and populate the errorsummary.
You can't use a shared code for this, since all the shared method is able to call on the client is Silverlight .Net classes. There is no way you can call a stored procedure. So you have to add a custom method to the DomainService, which you should call explicitly.
See the DiscountProduct example in the ".NET RIA Services Overview for Mix 2009 Preview" (http://download.microsoft.com/download/F/B/8/FB8CA635-296B-487F-965C-8148F08B5319/riaservicesoverviewpreview.pdf)
I am working on a solution for this which seems to work pretty well. It will probably be another couple of days before I can get the post published though.
I did have a couple questions regarding your DataForm usage though. Are you having it auto-generate your fields? Are you using the standard command buttons, or are you hiding the DataForm buttons and using your own buttons (to save and cancel)?
Also, I presume that you are using WCF to invoke your stored procedure and get the ObservableCollection of results back, with something similar to FieldName, Message in the result object. And are you just passing all of the properties from your object into
the WCF method?
I am basing my solution on the following WCF call:
SilverLightRIA
Member
8 Points
27 Posts
How to make use of Custom Validation in code behind (.xaml.cs)
Jun 28, 2009 08:09 PM | LINK
metadata.cs
[CustomValidation(typeof(TestBA.Web.GenderValidation), "IsGenderValid")]
//[Required]
public string MALE_OR_FEMALE;
test.shared.cs
[Shared]
public static class GenderValidation
{
public static bool IsGenderValid(string gender, ValidationContext context, out ValidationResult valResult)
{
if (gender == "M" || gender == "m" || gender == "F" || gender == "f")
{
valResult = null;
return true;
}
else
{
valResult = new ValidationResult("The two valid values are 'M'/'F'");
return false;
}
}
[CustomValidation(typeof(GenderValidation), "IsGenderValid")]
[DataMember()]
[StringLength(30)]
public string MALE_OR_FEMALE
{
get
{
return this._male_or_female;
}
set
{
if ((this._male_or_female != value))
{
this.ValidateProperty("MALE_OR_FEMALE", value);
this.RaiseDataMemberChanging("MALE_OR_FEMALE");
this._mil_spec = value;
this.RaiseDataMemberChanged("MALE_OR_FEMALE");
}
}
}
On the dataform this validation works perfectly.
On click of validate button on the child window (using dataform), I run a validation routine, a stored procedure - which returns a dictionary of errors. Considering the above example(assuming that stored procedure gives an error if lower case "m" or "f" is entered or some other combination invalidates MALE_OR_FEMALE dataform field). How can I make use dictionary(KEY = MALE_OR_FEMALE, VALUE = "Value should be in upper case or something like this error message") in the code behind of this .xaml(dataform) and achieve exact same display result(the field is highlighted in red, an error message is displayed next to the dataformfield).
Is it possible to do something SIMILAR on the code behind (do I have to write a method similar to the one in test.shared.cs)
this.ValidateProperty("MALE_OR_FEMALE", value);
this.RaiseDataMemberChanging("MALE_OR_FEMALE");
this._mil_spec = value;
this.RaiseDataMemberChanged("MALE_OR_FEMALE");
Any help is appreciated.
Mog Liang -...
All-Star
21645 Points
2132 Posts
Microsoft
Re: How to make use of Custom Validation in code behind (.xaml.cs)
Jul 02, 2009 08:25 AM | LINK
If you mean trigger the control validation manually and get validate result list, this post would be useful
http://silverlight.net/forums/p/100112/230400.aspx#230400
Microsoft Online Community Support
Please remember to mark the replies as answers if they help and unmark them if they provide no help.
SilverLightRIA
Member
8 Points
27 Posts
Re: Re: How to make use of Custom Validation in code behind (.xaml.cs)
Jul 03, 2009 03:20 AM | LINK
Thanks for your response Mog Liang. You have pointed me the right direction, but I am not yet there to resolve the issue I am having.
My validations are defined in the metadata.cs (a different project TestBA.web). The .shared validations are defined in this project( a static Method IsFormLevelDataValid has all the validations for each of the each of the fields of the database.
I have a client project(TestBA) and I have done validation by calling stored procedure, which has returned a list of errors. I want to make use of this list and populate the errorsummary.
How do I call the validation(that is in TestBA.web) from .xaml.cs (in project TestBA) and send the list of errors(which has elements also) and context).
Thanks in advance.
Maud
Contributor
3551 Points
483 Posts
Re: Re: How to make use of Custom Validation in code behind (.xaml.cs)
Jul 03, 2009 04:33 AM | LINK
create a never valid validation with preset error message on entity, then trigger it manually.
I admit it's an ugly approach.[:S]
SilverLightRIA
Member
8 Points
27 Posts
Re: Re: Re: How to make use of Custom Validation in code behind (.xaml.cs)
Jul 06, 2009 07:38 AM | LINK
Hi Maud,
The issue is I do not know the validation error before hand. Only the stored procedure would know what data is valid. In practical business application, it is true that the business rules would change(enhancements). The business rules in stored procedure could be modified and I should not be changing any code on the front end. I do not want to put too much of business logic on the view.
How do I call the entity level validation from the code behind(.xaml.cs)? I have the errors returned by the store procedure in an observable collection. How do I call the entity level validation, which should accept observable collection, context, entity as parameteres.
Once again, any help is appreciated.
kylemc
Contributor
7231 Points
1146 Posts
Microsoft
Re: Re: Re: How to make use of Custom Validation in code behind (.xaml.cs)
Jul 06, 2009 04:30 PM | LINK
So just to summarize the issue, you can validate your entity using a procedure stored in the database and a validation method (like the sample) on the server. Your question is how to do the same thing on the client, right?
If you haven't done so already, for the first step you should create a CustomValidationAttribute an use it at the entity level (instead of the property).
Your IsMyEntityValid method can call the stored procedure directly (on the server). However, you'll find this approach will not translate well to the client. Since the stored procedure can only be accessed using a service, this means it can only be invoked asynchronously from the client. I have not seen any solutions (or even best practices) for asynchronous validation on the client.
One alternative (which you may be alluding to) is to make some of the rules and errors used in the stored procedure available as metadata. This metadata could be shared between the client and server. The full stored procedure validation could be performed on the server to ensure validity and an approximation could be run on the client for immediate, user-friendly feedback.
Kyle
SilverLightRIA
Member
8 Points
27 Posts
Re: Re: Re: How to make use of Custom Validation in code behind (.xaml.cs)
Jul 07, 2009 07:34 AM | LINK
Kyle, Thanks for your response. Here is how far I have reached. On the client, on button click, I was able to call stored procedure (invoked a service) and have the errors in an observable collection (the property and error message).
I think (I may be wrong), all I need to do is somehow send this observable collection(errors), context and entity (ent) to the custom validation (.shared.cs, which could be at the entity level as suggested by you..
theo67
Member
532 Points
181 Posts
Re: Re: How to make use of Custom Validation in code behind (.xaml.cs)
Jul 07, 2009 08:03 AM | LINK
You can't use a shared code for this, since all the shared method is able to call on the client is Silverlight .Net classes. There is no way you can call a stored procedure. So you have to add a custom method to the DomainService, which you should call explicitly. See the DiscountProduct example in the ".NET RIA Services Overview for Mix 2009 Preview" (http://download.microsoft.com/download/F/B/8/FB8CA635-296B-487F-965C-8148F08B5319/riaservicesoverviewpreview.pdf)
JeffHandley
Participant
764 Points
146 Posts
Microsoft
Re: Re: How to make use of Custom Validation in code behind (.xaml.cs)
Jul 08, 2009 07:53 AM | LINK
SilverlightRIA,
I am working on a solution for this which seems to work pretty well. It will probably be another couple of days before I can get the post published though.
I did have a couple questions regarding your DataForm usage though. Are you having it auto-generate your fields? Are you using the standard command buttons, or are you hiding the DataForm buttons and using your own buttons (to save and cancel)?
Also, I presume that you are using WCF to invoke your stored procedure and get the ObservableCollection of results back, with something similar to FieldName, Message in the result object. And are you just passing all of the properties from your object into the WCF method?
I am basing my solution on the following WCF call:
this._validationService.ValidateEmployeeAsync(employee.Gender, employee.MaritalStatus);
And then the result being:
ObservableCollection<ValidationService.GetEmployeeValidationErrorsResult>
Where GetEmployeeValidationErrorsResult has:
- string ErrorMessage
- string FieldName
Does this sound consistent with what you're doing?
Thanks,
Jeff Handley
Validation Stored Procedures DataForm WCF metadata ErrorSummary
JeffHandley
Participant
764 Points
146 Posts
Microsoft
Re: Re: How to make use of Custom Validation in code behind (.xaml.cs)
Jul 11, 2009 01:24 PM | LINK
Please see http://blog.jeffhandley.com/archive/2009/07/11/asyncvalidation.aspx for my solution to this. It works with Silverlight 3 RTW and .NET RIA Services July 2009 Preview.
I'd love to hear how this works for you.
-Jeff Handley
DataForm WCF Async Validation