c# dynamic动态类型和匿名类-蒲公英云

c# dynamic动态类型和匿名类

dynamic类型
简单示例

dynamic expando = new System.Dynamic.ExpandoObject(); //动态类型字段 可读可写
expando.Id = 1;
expando.Name = "Test";
string json = Utils.ConvertJson.JsonEncode(expando);  //输出{Id:1,Name:'Test'}

动态添加字段

复制代码

List<string> fieldList = new List<string>() { "Name","Age","Sex"}; //From config or db
dynamic dobj = new System.Dynamic.ExpandoObject();
var dic = (IDictionary<string, object>)dobj;
foreach (var fieldItem in fieldList)
{
　　dic[fieldItem] = "set "+fieldItem+" value";  
   /*实现类似js里的 动态添加属性的功能
   var obj={};
   var field="Id";
   eval("obj."+field+"=1");
   alert(obj.Id); //1  
   */
}
var val = dobj.Name; //“set Name value”
var val1=dobj.Age;//”set Age value“

复制代码

枚举该对象所有成员

复制代码

foreach (var fieldItem in (IDictionary<String, Object>)dobj)
{
　　var v = (fieldItem.Key + ": " + fieldItem.Value);
}
匿名类
//var aaaa = new {Id=1,Name="Test"}; //匿名类字段只读不可写
dynamic aaaa = new {Id=1,Name="Test"}; //匿名类字段只读不可写
aaaa.Id = 2; //不可写 报错无法为属性或索引器“<>f__AnonymousType1<int>.Id”赋值 - 它是只读的
dynamic obj = Newtonsoft.Json.JsonConvert.DeserializeObject("{Name:'aa',Sex:'Male',Age:11}");
var name = obj.Name.Value; //aa