生成Csv格式的字符串

using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Text;

namespace Comon
{
    public class CsvUtil
    {
        /// <summary>
        ///     生成Csv格式的字符串
        /// </summary>
        /// <typeparam name="T">数据源类型</typeparam>
        /// <param name="sourceDate">数据源</param>
        /// <param name="generateFilelds">需要生成到Csv格式字符串的字段列表</param>
        /// <returns></returns>
        public static string GenerateCsvFormate<T>(IList<T> sourceDate, IList<string> generateFilelds)
            where T : class, new()
        {
            if (sourceDate == null)
            {
                throw new ArgumentNullException(nameof(sourceDate));
            }

            Type type = typeof(T);
            PropertyInfo[] propertyInfos = type.GetProperties();

            IList<string> fieldValueList = new List<string>(generateFilelds.Count);

            StringBuilder builder = new StringBuilder();
            builder.Append("?(\"");
            foreach (var item in sourceDate)
            {
                builder.Append("\n");
                fieldValueList.Clear();
                foreach (var field in generateFilelds)
                {
                    PropertyInfo property = propertyInfos.FirstOrDefault(c => c.Name == field);
                    if (property != null)
                    {
                        var fieldValue = property.GetValue(item).ToString();
                        fieldValueList.Add(fieldValue);
                    }
                }
                builder.Append(string.Join(",", fieldValueList));
            }
            builder.Append("\n\")");
            return builder.ToString();
        }
    }
}