.Net core web api 上传图片代码

/// <summary>
/// 上传图片
/// </summary>
/// <param name="file"></param>
/// <returns></returns>
[HttpPost]
public async Task<ApiResult> FileSave(IFormFile file)
{
string fileName = "";
var saveName = "";
var filePath = "";
try
{
//获取Form提交的文件
if (file != null)
{
if (file.Length > 0)
{
var now = DateTime.Now;
//文件存储路径
filePath = string.Format("wwwroot/Uploads/{0}/{1}/{2}/", now.ToString("yyyy"), now.ToString("yyyyMM"), now.ToString("yyyyMMdd"));
//获取当前web目录
var webRootPath = _webHostEnvironment.ContentRootPath;
//保存目录不存在就创建这个目录
if (!Directory.Exists(webRootPath + filePath))
{
Directory.CreateDirectory(webRootPath + filePath);
}
#region 图片文件的条件判断
//文件后缀
var fileExtension = Path.GetExtension(file.FileName);

//判断后缀是否是图片
const string fileFilt = ".gif|.jpg|.jpeg|.png|.bmp";
if (fileExtension == null)
{
return ResultHelper.Error("上传的文件没有后缀");
}
if (fileFilt.IndexOf(fileExtension.ToLower(), StringComparison.Ordinal) <= -1)
{
return ResultHelper.Error("请上传jpg、png、gif、bmp格式的图片");
}

//判断文件大小
long length = file.Length;
if (length > 1024 * 1024 * 2) //2M
{
return ResultHelper.Error("上传的文件不能大于2M");
}

#endregion
var strDateTime = DateTime.Now.ToString("yyMMddhhmmssfff"); //取得时间字符串
var strRan = Convert.ToString(new Random().Next(100, 999)); //生成三位随机数
saveName = strDateTime + strRan + fileExtension;
//在指定目录创建文件
fileName = webRootPath+ filePath + saveName;//文件名
FileHelper.CreateFile(fileName);

using (var stream = new FileStream(webRootPath + filePath + saveName, FileMode.Create))
{
await file.CopyToAsync(stream);
}
}
}
return ResultHelper.Success(filePath.Remove(0,7)+saveName, "上传成功");
}
catch (Exception ex)
{
return ResultHelper.Error("上传失败"+ ex.GetBaseException());
}
}
/// <summary>
/// 上传图片,通过Form表单提交上传多个
/// </summary>
/// <returns></returns>
[Route("Upload/FormImg")]
[HttpPost]
public async Task<ApiResult> UploadImg(List<IFormFile> files)
{
if (files.Count < 1)
{
return ResultHelper.Error("文件为空");
}
//返回的文件地址
List<string> filenames = new List<string>();
var now = DateTime.Now;
//文件存储路径
var filePath = string.Format("/Uploads/{0}/{1}/{2}/", now.ToString("yyyy"), now.ToString("yyyyMM"), now.ToString("yyyyMMdd"));
//获取当前web目录
var webRootPath = _webHostEnvironment.WebRootPath;
if (!Directory.Exists(webRootPath + filePath))
{
Directory.CreateDirectory(webRootPath + filePath);
}
try
{
for (int i = 0; i < files.Count; i++)
{

#region 图片文件的条件判断
//文件后缀
var fileExtension = Path.GetExtension(files[i].FileName);

//判断后缀是否是图片
const string fileFilt = ".gif|.jpg|.jpeg|.png|.bmp";
if (fileExtension == null)
{
break;
//return Error("上传的文件没有后缀");
}
if (fileFilt.IndexOf(fileExtension.ToLower(), StringComparison.Ordinal) <= -1)
{
break;
//return Error("请上传jpg、png、gif格式的图片");
}

//判断文件大小
long length = files[i].Length;
if (length > 1024 * 1024 * 2) //2M
{
break;
//return Error("上传的文件不能大于2M");
}

#endregion

var strDateTime = DateTime.Now.ToString("yyMMddhhmmssfff"); //取得时间字符串
var strRan = Convert.ToString(new Random().Next(100, 999)); //生成三位随机数
var saveName = strDateTime + strRan + fileExtension;

//插入图片数据
using (FileStream fs = System.IO.File.Create(webRootPath + filePath + saveName))
{
await files[i].CopyToAsync(fs);
fs.Flush();
}

filenames.Add(filePath + saveName);

}
return ResultHelper.Success(filenames,"");
}
catch (Exception ex)
{
//这边增加日志，记录错误的原因
//ex.ToString();
return ResultHelper.Error("上传失败"+ex.GetBaseException());
}
}