調用通用類的方法

Question

這裏是上下文：

我嘗試編寫一個映射器來動態地將我的DomainModel對象轉換爲ViewModel Ojects。我得到的問題是，當我嘗試通過反射調用通用類的方法時出現此錯誤：

System.InvalidOperationException：對於ContainsGenericParameters爲true的類型或方法，無法執行後期操作。

有人可以幫我找出故障在哪裏嗎？這將不勝感激

這裏是代碼（我試圖簡化它）：

public class MapClass<SourceType, DestinationType> 
{ 

    public string Test() 
    { 
     return test 
    } 

    public void MapClassReflection(SourceType source, ref DestinationType destination) 
    { 
     Type sourceType = source.GetType(); 
     Type destinationType = destination.GetType(); 

     foreach (PropertyInfo sourceProperty in sourceType.GetProperties()) 
     { 
      string destinationPropertyName = LookupForPropertyInDestinationType(sourceProperty.Name, destinationType); 

      if (destinationPropertyName != null) 
      { 
       PropertyInfo destinationProperty = destinationType.GetProperty(destinationPropertyName); 
       if (destinationProperty.PropertyType == sourceProperty.PropertyType) 
       { 
        destinationProperty.SetValue(destination, sourceProperty.GetValue(source, null), null); 
       } 
       else 
       { 

         Type d1 = typeof(MapClass<,>); 
         Type[] typeArgs = { destinationProperty.GetType(), sourceType.GetType() }; 
         Type constructed = d1.MakeGenericType(typeArgs); 

         object o = Activator.CreateInstance(constructed, null); 

         MethodInfo theMethod = d1.GetMethod("Test"); 

         string toto = (string)theMethod.Invoke(o,null); 

       } 
       } 
      } 
     } 


    private string LookupForPropertyInDestinationType(string sourcePropertyName, Type destinationType) 
    { 
     foreach (PropertyInfo property in destinationType.GetProperties()) 
     { 
      if (property.Name == sourcePropertyName) 
      { 
       return sourcePropertyName; 
      } 
     } 
     return null; 
    } 
} 

Answer 1

你需要調用GetMethod的構造類型constructed，不的類型定義d1。

// ... 

Type d1 = typeof(MapClass<,>); 
Type[] typeArgs = { destinationProperty.GetType(), sourceType.GetType() }; 
Type constructed = d1.MakeGenericType(typeArgs); 

object o = Activator.CreateInstance(constructed, null); 

MethodInfo theMethod = constructed.GetMethod("Test"); 

string toto = (string)theMethod.Invoke(o, null); 

// ...