本文介绍了ASP.NET MVC HttpPostedFileBase文件上传 ，分享给大家，希望对大家有帮助
HttpPostedFileBase文件上传，支持多文件一次上传，如有图片，则支持略缩图保存
文件传输信息封装
/// <summary>
/// 文件生成方式
/// </summary>
public class UpFileMessage
{
/// <summary>
/// 文件名
/// </summary>
public string OriginalFileName { get; set; }
/// <summary>
/// 是否保存略缩图
/// </summary>
public bool IsImage { get; set; }
/// <summary>
/// 文件流
/// </summary>
public Stream FileStream { get; set; }
/// <summary>
/// 生成缩略图的方式
/// [WH]-指定宽高
/// [H]-指定高，按比例缩放宽
/// [W]-指定宽，按比例缩放高
/// </summary>
public string Mode { get; set; }
/// <summary>
/// 略缩图高度
/// </summary>
public int? ThumbHeight { get; set; }
/// <summary>
/// 略缩图宽度
/// </summary>
public int? ThumbWidth { get; set; }
}
文件上传返回结果
/// <summary>
/// 文件上传返回结果
/// </summary>
public class UpFileResultMessage
{
/// <summary>
/// 文件保存是否成功
/// </summary>
public bool IsSuccess { get; set; }
/// <summary>
/// 错误消息
/// </summary>
public string Message { get; set; }
/// <summary>
/// 原始文件名-（无扩展名）
/// </summary>
public string FileName { get; set; }
/// <summary>
/// 文件名扩展名
/// </summary>
public string FileSuffix { get; set; }
/// <summary>
/// 文件名保存路径
/// </summary>
public string FilePath { get; set; }
/// <summary>
/// 文件类型为图片时
/// 缩略图保存路径
/// </summary>
public string ThumbPath { get; set; }
/// <summary>
/// 保存文件名（无扩展名）
/// </summary>
public string SaveFileName { get; set; }
/// <summary>
/// 文件自增ID
/// </summary>
public int[] FileIdArray { get; set; }
}
文件上传类库
需引用System.Web命名空间，并对 [System.Web.UI.Page] 进行继承，调用Server.MapPath方法
public class FileUtil : System.Web.UI.Page
{
/// <summary>
/// 图片上传
/// </summary>
/// <param name="fileMessage">文件生成方式</param>
/// <returns></returns>
public UpFileResultMessage UpLoadFile(UpFileMessage fileMessage)
{
try
{
string now = DateTime.Today.ToString("yyyyMMdd");
string guid = Guid.NewGuid().ToString();
//获取文件扩展名
var fileSuffix = Path.GetExtension(fileMessage.OriginalFileName);
var uploadFolder = Path.Combine(System.Web.HttpContext.Current.Server.MapPath(ParmsConfig.UpFilePathUrl), now);
if (!Directory.Exists(uploadFolder))
{
Directory.CreateDirectory(uploadFolder);
}
//保存文件名
string saveFileName = guid + fileSuffix;
string filePath = Path.Combine(uploadFolder, saveFileName);
UpFileResultMessage upFileResult = new UpFileResultMessage()
{
IsSuccess = true,
FileName = Path.GetFileNameWithoutExtension(fileMessage.OriginalFileName),
FileSuffix = fileSuffix,
FilePath = string.Format(@"{0}/{1}", ParmsConfig.UpFileIPAddressUrl, now),
SaveFileName = guid
};
using (Stream sourceStream = fileMessage.FileStream)
{
using (FileStream targetStream = new FileStream(filePath, FileMode.Create, FileAccess.Write, FileShare.None))
{
const int bufferLen = 1024 * 4;//4KB
byte[] buffer = new byte[bufferLen];
int count = 0;
while ((count = sourceStream.Read(buffer, 0, bufferLen)) > 0)
{
targetStream.Write(buffer, 0, count);
}
}
//上传文件为图片时,需创建缩略图
if (fileMessage.IsImage)
{
var uploadThumbFolder = Path.Combine(uploadFolder, "Thumb");
if (!Directory.Exists(uploadThumbFolder))
{
Directory.CreateDirectory(uploadThumbFolder);
}
using (FileStream targetStream = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.None))
{
System.Drawing.Image image = System.Drawing.Image.FromStream(targetStream);
int width = image.Width;
int height = image.Height;
int thumbWidth = 0;
int thumbHeight = 0;
switch (fileMessage.Mode)
{
case "WH": //指定高宽缩放（可能变形）
thumbWidth = fileMessage.ThumbWidth.HasValue ? fileMessage.ThumbWidth.Value : 200;
thumbHeight = fileMessage.ThumbHeight.HasValue ? fileMessage.ThumbHeight.Value : 200;
break;
case "W": //指定宽，高按比例
thumbWidth = fileMessage.ThumbWidth.HasValue ? fileMessage.ThumbWidth.Value : 200;
thumbHeight = height * thumbWidth / width;
break;
case "H": //指定高，宽按比例
thumbHeight = fileMessage.ThumbHeight.HasValue ? fileMessage.ThumbHeight.Value : 200;
thumbWidth = width * thumbHeight / height;
break;
default:
thumbWidth = fileMessage.ThumbWidth.HasValue ? fileMessage.ThumbWidth.Value : 200;
thumbHeight = height * thumbWidth / width;
break;
}
string thumbFilePath = Path.Combine(uploadThumbFolder, saveFileName);
CreateThumbnail(thumbFilePath, targetStream, thumbWidth, thumbHeight);
upFileResult.ThumbPath = string.Format(@"{0}/{1}/Thumb", ParmsConfig.UpFileIPAddressUrl, now);
}
}
}
return upFileResult;
}
catch (Exception ex)
{
return new UpFileResultMessage() { IsSuccess = false, Message = ex.Message };
}
}
/// <summary>
/// 创建指定图片文件流的缩略图
/// </summary>
/// <param name="thumbFilePath">缩略图文件保存路径</param>
/// <param name="fileStream">原始文件流</param>
/// <param name="width">缩略图宽</param>
/// <param name="height">缩略图高</param>
private void CreateThumbnail(string thumbFilePath, Stream fileStream, int width, int height)
{
using (Image image = Image.FromStream(fileStream))
{
using (Image thumbnail = image.GetThumbnailImage(width, height, null, IntPtr.Zero))
{
thumbnail.Save(thumbFilePath);
}
}
}
}
调用方式
var upFileMsg = new UpFileMessage()
{
IsImage = true,
OriginalFileName = platformImg[i].FileName,
FileStream = platformImg[i].InputStream,
ThumbWidth = ThumbWidth,
Mode = "W"
};
var upFileResultMsg = new FileUtil().UpLoadFile(upFileMsg);
代码地址：文件上传类库包.zip
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阿兔在线工具。
