c# dynamic动态类型和匿名类

为表示对原作者的尊重,先贴出原文链接:https://www.cnblogs.com/hnsongbiao/p/8250956.html

以下是正文:

 

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

List fieldList = new List() { "Name","Age","Sex"}; //From config or db
dynamic dobj = new System.Dynamic.ExpandoObject();

var dic = (IDictionary)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“

 枚举该对象所有成员

foreach (var fieldItem in (IDictionary)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.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

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