Question

我有一个应用程序，我试图保持数据访问和UI分开。为此，我有两个项目，一个用于UI，另一个用于数据访问。我遇到的问题是如何有效地将从UI项目中的配置文件获取的数据传递给数据访问项目中的类。

数据访问项目包含两个类......

PaymentProcessor.cs
Payment.cs

PaymentProcessor类负责制作Web API请求以获取＆＃34; Payment＆＃34;对象。我需要将一个字符串传递给Payment对象，以便它可以使用该字符串来查看付款中是否存在特定模式。

将此字符串传递给Payment类的最佳方法是什么？我是否在PaymentProcessor类上创建了一个属性，然后作为Payment类的属性传递？好像我正在玩＃34;通过财产＆＃34;。有更好的方法吗？

以下是一些示例代码，用于说明我如何使用这些类以及如何传递＆＃34; ValidationString＆＃34;。

// Code to execute in UI
var payProccessor = new PaymentProcessor();
payProccessor.ValidationStringToPass = "ABCDEFG";
payProccessor.ProcessPayment();

public class PaymentProcessor()
{
  public string ValidationStringToPass {get; set;}

  public void ProcessPayment()
  {
    // Get payment object collection
    List<Payment> paymentCollection = GetPayments();

    foreach(Payment p in paymentCollection)
    {
      p.ValidationString = this.ValidationStringToPass;
      p.DoStuff();
    }
  }
}

public class Payment
{
  string ValidationString {get; set;}

  public void DoStuff()
  {
    // do stuff with the ValidationString
  }
}

Answer 1

以下是使用DependencyProperties和绑定的一种方法。

将您的付款类设为DependencyObject

public class Payment : DependencyObject
{
    public static readonly DependencyProperty ValidationStringProperty =
             DependencyProperty.Register("ValidationString", typeof(string), typeof(Payment), new PropertyMetadata(new PropertyChangedCallback(OnValidationStringChanged)));
    public string ValidationString
    {
        get { return (string)this.GetValue(Payment.ValidationStringProperty); }
        set
        {
            this.SetValue(Payment.ValidationStringProperty, value);
        }
    }

    private static void OnValidationStringChanged(object sender, DependencyPropertyChangedEventArgs e)
    {
        // do stuff all that stuff you wanted to do ValidationString
    }
}

然后让PaymentProcessor实现INotifyPropertyChanged

public class PaymentProcessor : INotifyPropertyChanged
{
    public PaymentProcessor()
    {
    }
    private string _validationStringToPass; 
    public string ValidationStringToPass 
    {
        get { return _validationStringToPass; }
        set
        {
            _validationStringToPass = value;
            OnPropertyChanged("ValidationStringToPass");
        }
    }
    public event PropertyChangedEventHandler PropertyChanged;
    private void OnPropertyChanged(string property)
    {
        if (PropertyChanged != null)
        {
            PropertyChanged(this, new PropertyChangedEventArgs(property));
        }
    }
    //Get your payments here, might want to put this in the constructor
    public void GetPayments()
    {
        Binding bind = new Binding() { Source = this, Path = new PropertyPath("ValidationStringToPass") };
        Payment pay = new Payment();
        BindingOperations.SetBinding(pay, Payment.ValidationStringProperty, bind);
        Payment pay1 = new Payment();
        BindingOperations.SetBinding(pay1, Payment.ValidationStringProperty, bind);
    }
}

然后在您的UI代码中，您可以执行以下操作

    var payProccessor = new PaymentProcessor();
    payProccessor.GetPayments();
    payProccessor.ValidationStringToPass = "ABCDEFG";

当您在PaymentProcessor中更改ValidationStringToPass属性时，它将更新您在GetPayments方法中绑定的Payments中的ValidationString属性。

在类之间传递属性的首选方法

1 个答案: