Property genration in Silverlight for WCF service proxy class.

11-06-2009 8:40 AM |

I have silverlight project that uses WCF services.  This wcf service returns an object back to client and has following property.

[DataMember]

private decimal refurbCost;

[DataMember]

public decimal RefurbCost {

get

{

return refurbCost;

}

set

{

if (value > NewCost)

{

throw new ValidationException("Refurb cost can not be greater then New Cost.");

}

refurbCost = value;

}

}

 

When I look at the proxy class generated in WCF service in silverlight, I see property generated like this.

[System.Runtime.Serialization.DataMemberAttribute(Name="refurbCost")]

public decimal refurbCost1 {

get {

return this.refurbCost1Field;

}

set {

if ((this.refurbCost1Field.Equals(value) != true)) {

this.refurbCost1Field = value;this.RaisePropertyChanged("refurbCost1");

}

}

}

[System.Runtime.Serialization.DataMemberAttribute()]

public decimal RefurbCost {

get {return this.RefurbCostField;

}

set {

if ((this.RefurbCostField.Equals(value) != true)) {

this.RefurbCostField = value;

this.RaisePropertyChanged("RefurbCost");

}

}

}

 

Question is whey is it stripping out my validation in the property of the object that I am returning from WCF service.

 

 

Re: Property genration in Silverlight for WCF service proxy class.

11-06-2009 8:51 AM |

 have a look at yavor's response here:

http://forums.silverlight.net/forums/p/37731/154037.aspx

basically the cause is that the proxy generator doesn't copy your logic.  the solution is to bypass the proxy generator by explicitly providing the type through a separate assembly.

Re: Re: Property genration in Silverlight for WCF service proxy class.

11-06-2009 10:17 AM |

thanks for this post.  So, I do have my types in a seprate class library.  However there are two issues with this.

 1) when I try to add this type class library(Add reference, Projects, types project) to silverlight project, it tells me that "You cna only add project references to othe Silverlight project in the solutions.

2) by leting proxy generate type you have benefit of each type clas generated is inherited from INotifyPropertyChanged  and each property has this.RaisePropertyChanged("someproperty"); call.  I have hundreads of types and to make this changes in class library will be hughe. 

Is there some other options that you can think of that might accomplish the validation in silverlight using the proxy generated classes.

Re: Property genration in Silverlight for WCF service proxy class.

11-06-2009 1:40 PM |

Hey spatemp.... You don't need to set the DataMember attribute to the Private member. All you have to do is: Set the DataMember attribute to the public property which u already done. So, just remove the attribute from the private member declaration & then see...

Hope, this will resolve your problem..

Re: Re: Property genration in Silverlight for WCF service proxy class.

11-06-2009 3:22 PM |

thats fine.  I can take out the [DataMember] but the question is how do you retain the validation in property.  Becuase during adding wcf service to silverlight and the type generated in proxy does not have this validation.  It removes it.

Re: Re: Property genration in Silverlight for WCF service proxy class.

11-06-2009 5:48 PM |

spatemp:

Is there some other options that you can think of that might accomplish the validation in silverlight using the proxy generated classes.

 

With ValidationAttribute from System.ComponentModel.DataAnnotations you can tag the property with ValidationAttribute Tag without putting any code logic in the Setter.  But that probably won't work for your case:

If you need to limit the data range on a field, you could tag your Property with RangeAttribute :

[Range(min, max,  ErrorMessage = "Value for {0} must be between {1} and {2}.")]

public int YourProperty {get;set;} 

But in your case you are trying to compare the value with the value of another Field. I don't think using RangeAttribute can work.