WebApi form-data上传文件

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///<summary>
/// 上传附件信息 ""
///MsgJson:json数组,格式如下[{},{},{}]
///MsgJson中的json对象中下列参数是必须的：BUSTABLENAME（业务表名）,BUSTABLEKEYID(业务表主键Id)，FILENAME（文件名），
///FILETYPE（文件类型），FILEPATH（附件保存路径）
///一下参数可在json中拓展
/// 文件名称与json数组中FileNme一一对应
/// </summary>
/// <returns></returns>
public async Task<BaseResult> UploadFileLotNew()
{
string log = "进入上传接口";
if (Request.Properties.ContainsKey("MS_HttpContext"))
{
log = log + "--含有MS_HttpContext";
dynamic ctx = Request.Properties["MS_HttpContext"];
if (ctx != null)
{
log = log + "--ctx不为空";
string c = ctx.Request.Headers["Content-Type"];
log = log + "--Content-Type：" + c;
}
else
{
log = log + "--ctx为空";
}
}
else
{
log = log + "--不含有MS_HttpContext";
}
DBLog.debug("开始进入文件上传接口_UploadFileLotNew" + log, 2, null);
BaseResult br = new BaseResult();
IList<Tf_Bas_Attachment> attachList = new List<Tf_Bas_Attachment>();
//IsMultipartContent方法检查该请求是否含有多部分MIME消息。如果不是，控制器返回HTTP状态码415（不支持的媒体类型）。
if (!Request.Content.IsMimeMultipartContent())
{
br.state = false;
br.message = "上传失败，非multipart（多部分）MIME消息的格式";
return br;
}
Dictionary<string, string> dic = new Dictionary<string, string>();
string webFolder = GetWbePath();
string savaFolder = GetSavePath(webFolder);
if (!Directory.Exists(savaFolder))
{
Directory.CreateDirectory(savaFolder);
}
// 设置上传目录
//var provider = new MultipartFormDataStreamProvider(savaFolder);//原写法
var provider = new RenamingMultipartFormDataStreamProvider(savaFolder);//重命名写法
try
{
// Read the form data.读取表单数据
//异步方法。为了在该方法完成之后执行一些工作，需要使用“continuation（继续）任务”（.NET 4.0）或await关键字（.NET 4.5）
//这里执行文件存储========
DBLog.debug("文件上传接口_UploadFileLotNew--开始文件存储", 2, null);
await Request.Content.ReadAsMultipartAsync(provider);
DBLog.debug("文件上传接口_UploadFileLotNew--结束文件存储", 2, null);
//存储完成================

#region 处理json

//string userId = provider.FormData.Get("UserId");
//string DataTypeId = provider.FormData.Get("DataTypeId");
//if (String.IsNullOrEmpty(userId))
//{
// br.state = false;
// br.message = "数据有误,请检查UserId";
// return br;
//}
//switch (DataTypeId)
//{
// case "1":
// break;
// case "2":
// break;
// default:
// br.state = false;
// br.message = "数据有误,请检查DataTypeId";
// return br;

//}
List<UploadCheckFileJsonModel> list = new List<UploadCheckFileJsonModel>();
string json = provider.FormData.Get("MsgJson");
if (String.IsNullOrEmpty(json))
{
br.state = false;
br.message = "MsgJson不能为空";
return br;
}
//DBLog.debug("文件上传接口_UploadFileLotNew:" + "userId:" + userId + "MsgJson:" + json, 2, null);
try
{
list = JsonConvert.DeserializeObject<List<UploadCheckFileJsonModel>>(json);

}
catch (Exception e)
{
br.state = false;
br.message = "数据有误,请检查MsgJson";
return br;
}

#endregion

#region json 与图片一一对应
foreach (MultipartFileData file in provider.FileData)
{
string filePath = file.Headers.ContentDisposition.FileName;
if (filePath.StartsWith(@"""") && filePath.EndsWith(@""""))
filePath = filePath.Substring(1, filePath.Length - 2);
string fileName = Path.GetFileName(filePath);
string extName = Path.GetExtension(fileName);
FileInfo fileInfo = new FileInfo(file.LocalFileName);
string fileNewName = fileInfo.Name;
File.AppendAllText(HttpContext.Current.Server.MapPath("~/log.txt"), fileNewName + "\r\n");

UploadCheckFileJsonModel _model = list.Find(

delegate(UploadCheckFileJsonModel model)
{
return model.FILENAME == fileName;
});
if (_model == null)
{
br.state = false;
br.message = "数据有误,MsgJson与文件不匹配";
return br;
}
if (String.IsNullOrEmpty(_model.BUSTABLENAME) || String.IsNullOrEmpty(_model.BUSTABLEKEYID))
{
br.state = false;
br.message = "数据有误,缺少必要参数";
return br;
}

Tf_Bas_Attachment _entity = new Tf_Bas_Attachment();

_entity.ID = Guid.NewGuid().ToString();
_entity.BUSTABLENAME = _model.BUSTABLENAME;
_entity.BUSTABLEKEYID = _model.BUSTABLEKEYID;
_entity.FILENAME = fileName;
_entity.FILETYPE = extName;
_entity.FILEPATH = webFolder + "/" + fileNewName;
_entity.CREATETIME = System.DateTime.Now.ToString();
attachList.Add(_entity);
string originalPath = HttpContext.Current.Server.MapPath(_entity.FILEPATH);
string thumbPath = GetThumbnailUrl(_entity.FILEPATH);
thumbPath = HttpContext.Current.Server.MapPath(thumbPath);
ImageHelper.MakeZoomImage(originalPath, thumbPath, 100, 100, "HW");
}
#endregion

}
catch (Exception e)
{
DBLog.debug("文件上传接口_UploadFileLotNew:catch:" + e.Message, 2, e);
br.message = "上传失败，异常信息：" + e.Message;
br.state = false;
return br;
}
if (iTF_GOV_GOVERNANCETASK_Business.InsertList(attachList))
{
br.state = true;
br.message = "上传成功";
br.jdata = attachList;
return br;
}
else
{
br.state = false;
br.message = "上传失败，数据库存储出错";
return br;
}

}

/// <summary>
/// 重命名上传的文件
/// </summary>
public class RenamingMultipartFormDataStreamProvider : MultipartFormDataStreamProvider
{
public string Root { get; set; }
//public Func<FileUpload.PostedFile, string> OnGetLocalFileName { get; set; }

public RenamingMultipartFormDataStreamProvider(string root)
: base(root)
{
Root = root;
Console.Write(this.FormData.Get("MsgJson"));
}
/// <summary>
/// 获取新的文件名，时间格式
/// </summary>
/// <param name="headers"></param>
/// <returns></returns>
public override string GetLocalFileName(HttpContentHeaders headers)
{
string filePath = headers.ContentDisposition.FileName;

// Multipart requests with the file name seem to always include quotes.
if (filePath.StartsWith(@"""") && filePath.EndsWith(@""""))
filePath = filePath.Substring(1, filePath.Length - 2);
var filename = Path.GetFileName(filePath);
string extName = Path.GetExtension(filename);
string fileNewName = DateTime.Now.ToString("yyyyMMddHHmmssfff") + extName;
var extension = Path.GetExtension(filePath);
string contentType = null;
if (headers.ContentType != null)
{
contentType = headers.ContentType.MediaType;
}

return fileNewName;
}

}

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