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C#实现文件上传与下载功能实例

林译川
林译川
• 👁 0人浏览过

最近学习了 C#实现文件上传与下载，现在分享给大家。

1、C#文件上传

创建MyUpload.htm页面，用于测试


创建UploadFile.aspx文件，在UploadFile.aspx.cs键入如下代码：

Random rnd = new Random(); //产生随机数private string _directory = @"/File/UploadFile"; //目录protected void Page_Load(object sender, EventArgs e){try{if (RequestFilesCount > 0){//判断文件大小int length = RequestFiles[0]ContentLength;if (length > 1048576){ResponseWrite("文件大于1M，不能上传");return;}

string type = RequestFiles[0]ContentType;string fileExt = PathGetExtension(RequestFiles[0]FileName)ToLower();//只能上传图片，过滤不可上传的文件类型string fileFilt = "gif|jpg|php|jsp|jpeg|png|";if (fileFiltIndexOf(fileExt) <= -1){ResponseWrite("对不起！请上传图片！！");return;}else{string fileName = ServerMapPath(_directory) + "\\" + DateTimeNowToString("yyyyMMddHHmmssfff") + rndNext(10, 99)ToString() + fileExt;RequestFiles[0]SaveAs(fileName);ResponseWrite("上传成功！");}}}catch{throw new Exception();}}2 、C#文件下载

创建DownloadFile.aspx，在DownloadFile.aspx.cs键入如下方法：

///

/// C#文件下载/// /// public void MyDownload(string filename){

string path = ServerMapPath("/File/"+filename);if(!FileExists(path)){ResponseWrite("对不起！文件不存在！！");return;}SystemIOFileInfo file = new SystemIOFileInfo(path);string fileFilt="asp|aspx|php|jsp|ascx|config|asa|"; //不可下载的文件，务必要过滤干净string fileName = fileName;string fileExt = fileNameSubstring(filenameLastIndexOf(""))Trim()ToLower();if(fileFiltIndexOf(fileExt)!=-1){ResponseWrite("对不起！该类文件禁止下载！！");}else{ResponseClear();ResponseAddHeader("Content-Disposition", "attachment; filename=" + HttpUtilityUrlEncode(fileName));ResponseAddHeader("Content-Length", fileLengthToString());ResponseContentType = GetContentType(HttpUtilityUrlEncode(fileExt));ResponseWriteFile(fileFullName);ResponseEnd();}}

///

/// 获取下载类型/// /// /// public string GetContentType(string fileExt){string ContentType;switch (fileExt){case "asf":ContentType = "video/x-ms-asf"; break;case "avi":ContentType = "video/avi"; break;case "doc":ContentType = "application/msword"; break;case "zip":ContentType = "application/zip"; break;case "xls":ContentType = "application/vndms-excel"; break;case "gif":ContentType = "image/gif"; break;case "jpg":ContentType = "image/jpeg"; break;case "jpeg":ContentType = "image/jpeg"; break;case "wav":ContentType = "audio/wav"; break;case "mp3":ContentType = "audio/mpeg3"; break;case "mpg":ContentType = "video/mpeg"; break;case "mepg":ContentType = "video/mpeg"; break;case "rtf":ContentType = "application/rtf"; break;case "html":ContentType = "text/html"; break;case "htm":ContentType = "text/html"; break;case "txt":ContentType = "text/plain"; break;default:ContentType = "application/octet-stream";break;}return ContentType;} *如何获取现有文件的ContentType属性

///

/// 获取现有文件的ContentType属性/// /// /// public string GetFileContentType(string filename){string[] array = filenameSplit('');string result = stringEmpty;string suffix = "" + array[arrayLength - 1];MicrosoftWinRegistryKey rg = MicrosoftWinRegistryClassesRootOpenSubKey(suffix);object obj = rgGetValue("Content Type");result = obj != null ? objToString() : stringEmpty;rgClose();return result;} 以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。

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