如何在DynamicProxy中給C＃自動屬性一個默認值？

Question

namespace ConsoleApplication15 
{ 
    using System; 
    using Castle.DynamicProxy; 

    public class Test 
    { 
    private SubTestClass subTestClass; 

    public string Status 
    { 
     get 
     { 
     return this.subTestClass.SubStatus; 
     } 

     set 
     { 
     this.subTestClass.SubStatus = value; 
     } 
    } 

    public int Data { get; set; } 
    } 

    public class SubTestClass 
    { 
    public string SubStatus { get; set; } 
    } 

    public class Program 
    { 
    public static void Main(string[] args) 
    { 
     var proxyGenerator = new ProxyGenerator(); 
     var testObject = proxyGenerator.CreateClassProxy<Test>(); 
     if (testObject.Status != null) 
     { 
     Console.WriteLine("Working"); 
     } 
    } 
    } 
} 

我有以下代碼，我想將Status默認值設置爲Empty字符串。 當我運行下面的代碼時，狀態字符串始終爲Null，並拋出一個空異常！

testObject.Status這應該返回一個空字符串而不會引發異常。

Answer 1

我發現了一個soultion與IInterceptor的問題，我可以創建我的自定義結果。 感謝您的幫助！

namespace ConsoleApplication15 
{ 
    using System; 
    using Castle.DynamicProxy; 

    public class Test 
    { 
    private SubTestClass subTestClass; 

    public virtual string Status 
    { 
     get 
     { 
     return this.subTestClass.SubStatus; 
     } 

     set 
     { 
     this.subTestClass.SubStatus = value; 
     } 
    } 

    public int Data { get; set; } 
    } 

    public class SubTestClass 
    { 
    public string SubStatus { get; set; } 
    } 

    public class Program 
    { 
    public static void Main(string[] args) 
    { 
     var proxyGenerator = new ProxyGenerator(); 

     var testObject = proxyGenerator.CreateClassProxy<Test>(new MyInter()); 


     if (testObject.Status != null) 
     { 
     Console.WriteLine("Working"); 
     } 
    } 

    } 

    public class MyInter : IInterceptor 
    { 
    public void Intercept(IInvocation invocation) 
    { 
     if (invocation.Method.ReturnType == typeof(string)) 
     { 
     invocation.ReturnValue = string.Empty; 
     } 
    } 
    } 
} 

Answer 2

爲了讓自動實現的屬性的默認值，你就必須做到這一點在構造函數或類似的東西：

[TestFixture] 
public class UnitTest1 
{ 
    [Test] 
    public void TestMethod1() 
    { 
     var proxyGenerator = new ProxyGenerator(); 
     var testObject = proxyGenerator.CreateClassProxy<Test>(); 
     Console.WriteLine(
      testObject.Status != null 
      ? "Working" 
      : "no...."); 
    } 
} 

public class Test 
{ 
    private SubTestClass subTestClass = new SubTestClass(); 

    public string Status 
    { 
     get 
     { 
      return this.subTestClass.SubStatus; 
     } 

     set 
     { 
      this.subTestClass.SubStatus = value; 
     } 
    } 

    public int Data { get; set; } 
} 

public class SubTestClass 
{ 
    public SubTestClass() 
    { 
     SubStatus = ""; 
    } 
    public string SubStatus { get; set; } 
}