环境：net framework 4.5.2

    1. FileTool ft = new FileTool();
    2. //支持格式
    3. ft["Suffix"] = FileSuffix.Photo;
    1. public abstract class BaseTool : Upload {
    3.         /// <summary>
    4.         /// 最小文件数量
    5.         /// </summary>
    6.         public int MinFileCount = 1;
    8.         /// <summary>
    9.         /// 最大文件上传大小
    10.         /// </summary>
    11.         public int MaxFileCount = 5;
    13.         /// <summary>
    14.         /// 最大文件上传大小
    15.         /// </summary>
    16.         public int MaxFileSize = 10240;
    18.         /// <summary>
    19.         /// 默认类型
    20.         /// </summary>
    21.         public FileSuffix Suffix = FileSuffix.Ohter;
    23.         /// <summary>
    24.         /// 基本目录
    25.         /// </summary>
    26.         public string BaseDirectory = $"File/{DateTime.Now.ToString("yyyyMMdd")}/";
    28.         /// <summary>
    29.         /// 自定义属性
    30.         /// </summary>
    31.         /// <param name="key"></param>
    32.         /// <returns></returns>
    33.         public abstract object this[string key] { get; set; }
    35.         public virtual dynamic Down(ControllerBase b, string relativePath, string rename) {
    36.             throw new NotImplementedException();
    37.         }
    39.         public virtual string Up(HttpRequest req, bool rename = true) {
    40.             throw new NotImplementedException();
    41.         }
    43.     }
    1. public override object this[string key] {
    2.             get {
    3.                 return this.GetType().GetField(key).GetValue(this);
    4.             }
    5.             set {
    6.                 FieldInfo fieid = null;
    7.                 try {
    8.                     fieid = this.GetType().GetField(key);
    9.                     fieid.SetValue(this, value);
    10.                 } catch (Exception e) {
    11.                     throw new Exception($"试图将{value.GetType().ToString()}转{fieid.FieldType.ToString()}失败！");
    12.                 }
    13.             }
    14.         }