动态地向ExpandoObject添加属性

我想在运行时动态地向ExpandoObject添加属性。例如,要添加一个名为NewProp的字符串属性,我想写这样的东西

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

这容易实现吗?

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

另外:

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

正如Filip - http://www.filipekberg.se/2011/10/02/adding-properties-and-methods-to-an-expandoobject-dynamicly/在这里解释的那样

您也可以在运行时添加方法。

var x = new ExpandoObject() as IDictionary<string, Object>;
x.Add("Shout", new Action(() => { Console.WriteLine("Hellooo!!!"); }));
x.Shout();

下面是一个转换Object并返回带有给定对象的所有公共属性的Expando的示例helper类。

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<String, object>;
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");

我认为这样添加所需类型的新属性而不必设置基本值,就像在类定义中定义属性一样

var x = new ExpandoObject();
x.NewProp = default(string)

这是我找到的最好的解决办法。但是要小心。使用异常处理,因为它可能不适用于所有情况

    public static dynamic ToDynamic(this object obj)
{
return JsonConvert.DeserializeObject<dynamic>(JsonConvert.SerializeObject(obj));
}

这是我找到的最好的解决办法。但是要小心。使用异常处理,因为它可能不适用于所有情况

public static dynamic ToDynamic(this object obj)
{
return JsonConvert.DeserializeObject<dynamic>(JsonConvert.SerializeObject(obj));
}