動態添加屬性到ExpandoObject

Question

我想在運行時動態地將屬性添加到ExpandoObject。所以例如添加一個字符串屬性調用NewProp我想寫一些類似於

var x = new ExpandoObject(); 
x.AddProperty("NewProp", System.String); 

這很容易嗎？

Answer 1

dynamic x = new ExpandoObject(); 
x.NewProp = string.Empty; 

或者：

var x = new ExpandoObject() as IDictionary<string, Object>; 
x.Add("NewProp", string.Empty); 

Answer 2

正如菲利普這裏解釋 - http://www.filipekberg.se/2011/10/02/adding-properties-and-methods-to-an-expandoobject-dynamicly/

您可以在運行時也添加方法。

x.Add("Shout", new Action(() => { Console.WriteLine("Hellooo!!!"); })); 
x.Shout(); 

Answer 3

這裏是一個樣本助手類，它轉換一個Object並返回一個Expando與給定對象的所有公共屬性。

    public static class dynamicHelper 
     { 
      public static ExpandoObject convertToExpando(object obj) 
      { 
       //Get Properties Using Reflections 
       BindingFlags flags = BindingFlags.Public | BindingFlags.Instance; 
       PropertyInfo[] properties = obj.GetType().GetProperties(flags); 

       //Add Them to a new Expando 
       ExpandoObject expando = new ExpandoObject(); 
       foreach (PropertyInfo property in properties) 
       { 
        AddProperty(expando, property.Name, property.GetValue(obj)); 
       } 

       return expando; 
      } 

      public static void AddProperty(ExpandoObject expando, string propertyName, object propertyValue) 
      { 
       //Take use of the IDictionary implementation 
       var expandoDict = expando as IDictionary; 
       if (expandoDict.ContainsKey(propertyName)) 
        expandoDict[propertyName] = propertyValue; 
       else 
        expandoDict.Add(propertyName, propertyValue); 
      } 
     } 

用法：

//Create Dynamic Object 
dynamic expandoObj= dynamicHelper.convertToExpando(myObject); 

//Add Custom Properties 
dynamicHelper.AddProperty(expandoObj, "dynamicKey", "Some Value"); 

的