Using validation rules to disable a button for multiple textboxes

Question

Hi :
I have multiple textboxes that implement Validation Rules which will verify if entries are less than 99.9 and must not be charactrers.

       I know i have to tie it with "CanExecute" with the Button (Save Button for example).

But how do i put all the validation results of the textboxes in the CanExecution Method just to enable the Button (Save Button)?

Answer 1

You can use below code(Derive from the Microsoft document: WPF Apps With The Model-View-ViewModel Design Pattern) in your ViewModel for Save button. And you can download the Sample from here:

public ICommand SaveCommand  
{  
    get  
    {  
        if (_saveCommand == null)  
        {  
            _saveCommand = new RelayCommand(param => this.Save(),  
                param => this.CanSave);  
        }  
        return _saveCommand;  
    }  
}  
public void Save()  
{  
    if (!_customer.IsValid)  
        throw new InvalidOperationException("...");  
    if (this.IsNewCustomer)  
        _customerRepository.AddCustomer(_customer);  
    base.OnPropertyChanged("DisplayName");  
}  
bool IsNewCustomer  
{  
    get  
    {  
        return !_customerRepository.ContainsCustomer(_customer);  
    }  
}  
bool CanSave  
{  
    get  
    {  
        return String.IsNullOrEmpty(this.ValidateCustomerType()) &&   
            _customer.IsValid;  
    }  
}  

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