Question

如何用fileupload上传文件

Answer 1

/// <summary>上传文件方法
/// 返回文件名
/// </summary>
/// <param name="myFileUpload">上传控件ID</param>
/// <param name="allowExtensions">允许上传的扩展文件名类型,如：string[] allowExtensions = { ".doc", ".xls", ".ppt", ".jpg", ".gif" };</param>
/// <param name="maxLength">允许上传的最大大小，以M为单位</param>
/// <param name="savePath">保存文件的目录，注意是绝对路径,如：Server.MapPath("~/upload/");</param>
public static string Upload(FileUpload myFileUpload, string[] allowExtensions, int maxLength, string savePath)
{
// 文件格式是否允许上传
bool fileAllow = false;

//检查是否有文件案
if (myFileUpload.HasFile)
{
// 检查文件大小, ContentLength获取的是字节，转成M的时候要除以2次1024
if (myFileUpload.PostedFile.ContentLength / 1024 / 1024 >= maxLength)
{
throw new Exception("只能上传小于" + maxLength + "M的文件！");
}

//取得上传文件之扩展文件名，并转换成小写字母
string fileExtension = System.IO.Path.GetExtension(myFileUpload.FileName).ToLower();
string tmp = ""; // 存储允许上传的文件后缀名
//检查扩展文件名是否符合限定类型
for (int i = 0; i < allowExtensions.Length; i++)
{
tmp += i == allowExtensions.Length - 1 ? allowExtensions[i] : allowExtensions[i] + ",";
if (fileExtension == allowExtensions[i])
{
fileAllow = true;
}
}

if (fileAllow)
{
try
{
string datedir = DateTime.Now.ToString("yyyyMMdd");
if (!Directory.Exists(savePath + datedir))
{
Directory.CreateDirectory(savePath + datedir);
}
string saveName = Guid.NewGuid() + fileExtension;
string path = savePath + datedir + "/" + saveName;
//存储文件到文件夹
myFileUpload.SaveAs(path);
return datedir + "/" + saveName;
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
}
else
{
throw new Exception("文件格式不符，可以上传的文件格式为：" + tmp);
}
}
else
{
throw new Exception("请选择要上传的文件！");
}
}

调用：

try

{
string proimg = Niunan.Shop.Utility.Tool.Upload(fuimg, new string[] { ".jpg", ".gif", ".png" }, 3, Server.MapPath("~/upload/"));
}
catch (Exception ex)
{
Response.Write(ex.Message);
}