动态创建c#类，以及在Csvhelper中创建动态的数据对象

System.Dynamic.ExpandoObject_create.cs

 // my pretend dataset
        List<string> fields = new List<string>();
        // my 'columns'
        fields.Add("this_thing");
        fields.Add("that_thing");
        fields.Add("the_other");

        dynamic exo = new System.Dynamic.ExpandoObject();

        foreach (string field in fields)
        {
            ((IDictionary<String, Object>)exo).Add(field, field + "_data");
        }

        // output - from Json.Net NuGet package
        textBox1.Text = Newtonsoft.Json.JsonConvert.SerializeObject(exo);
        
        
// 在csv中使用动态创建
using (var memoryStream = new MemoryStream())
            {
                using (var writer = new StreamWriter(memoryStream, Encoding.UTF8))
                using (var csv = new CsvWriter(writer))
                {
                    // 动态展示的头部行数据
                    var con = Headers.ToList();

                    // 增加用户标识字段
                    var fields = new List<string>
                    {
                        "UserCode",
                    };

                    // 将模板的参数描述当作对象的字段
                    fields.AddRange(con);

                    // 动态组装对象
                    dynamic exo = new System.Dynamic.ExpandoObject();
                    foreach (string field in fields)
                    {
                        // 组装对象和值
                        ((IDictionary<String, Object>)exo).Add(field, "");
                    }
                    csv.WriteRecord(exo);
                }
                // 返回流
                return memoryStream.ToArray();
            }