using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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using System.Web;
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/// <summary>
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/// FileManager 的摘要说明
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/// </summary>
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public class ListFileManager : Handler
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{
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enum ResultState
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{
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Success,
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InvalidParam,
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AuthorizError,
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IOError,
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PathNotFound
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}
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private int Start;
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private int Size;
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private int Total;
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private ResultState State;
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private String PathToList;
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private String[] FileList;
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private String[] SearchExtensions;
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public ListFileManager(HttpContext context, string pathToList, string[] searchExtensions)
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: base(context)
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{
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this.SearchExtensions = searchExtensions.Select(x => x.ToLower()).ToArray();
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this.PathToList = pathToList;
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}
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public override void Process()
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{
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try
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{
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Start = String.IsNullOrEmpty(Request["start"]) ? 0 : Convert.ToInt32(Request["start"]);
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Size = String.IsNullOrEmpty(Request["size"]) ? Config.GetInt("imageManagerListSize") : Convert.ToInt32(Request["size"]);
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}
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catch (FormatException)
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{
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State = ResultState.InvalidParam;
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WriteResult();
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return;
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}
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var buildingList = new List<String>();
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try
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{
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var localPath = Server.MapPath(PathToList);
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buildingList.AddRange(Directory.GetFiles(localPath, "*", SearchOption.AllDirectories)
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.Where(x => SearchExtensions.Contains(Path.GetExtension(x).ToLower()))
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.Select(x => PathToList + x.Substring(localPath.Length).Replace("\\", "/")));
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Total = buildingList.Count;
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FileList = buildingList.OrderBy(x => x).Skip(Start).Take(Size).ToArray();
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}
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catch (UnauthorizedAccessException)
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{
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State = ResultState.AuthorizError;
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}
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catch (DirectoryNotFoundException)
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{
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State = ResultState.PathNotFound;
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}
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catch (IOException)
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{
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State = ResultState.IOError;
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}
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finally
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{
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WriteResult();
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}
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}
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private void WriteResult()
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{
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WriteJson(new
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{
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state = GetStateString(),
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list = FileList == null ? null : FileList.Select(x => new { url = x }),
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start = Start,
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size = Size,
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total = Total
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});
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}
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private string GetStateString()
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{
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switch (State)
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{
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case ResultState.Success:
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return "SUCCESS";
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case ResultState.InvalidParam:
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return "参数不正确";
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case ResultState.PathNotFound:
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return "路径不存在";
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case ResultState.AuthorizError:
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return "文件系统权限不足";
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case ResultState.IOError:
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return "文件系统读取错误";
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}
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return "未知错误";
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}
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}
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