/// <summary>
/// 文件存在性
/// </summary>
/// <returns></returns>
public bool FileExist(string filefullname)
{
string filepath = filefullname.Substring(0, filefullname.LastIndexOf("/") + 1);
string filename = filefullname.Remove(0, filepath.Length);
string Fileparentpath = BaseOp.WebPathTran(filepath);
return(File.Exists(Fileparentpath + filename));
}
/// <summary>
/// 删除目录（包括子文件及文件夹）
/// </summary>
/// <param name="parentPath">父级目录</param>
/// <param name="DirName">文件夹名</param>
public bool DeleteDir(string parentPath, string DirName)
{
try
{
Directory.Delete(BaseOp.WebPathTran(parentPath) + DirName, true);
return(true);
}
catch (Exception)
{
return(false);
}
}
/// <summary>
/// 文件删除
/// </summary>
/// <param name="parentPath">所在父级目录</param>
/// <param name="filename">文件名</param>
/// <returns></returns>
public static bool DeleteFile(string parentPath, string filename)
{
try
{
string filefullname = BaseOp.WebPathTran(parentPath) + filename;
File.Delete(filefullname);
return(true);
}
catch
{
return(false);
}
}
/// <summary>
/// 文件下载
/// </summary>
/// <param name="parentpath">所在目录</param>
/// <param name="filename">文件名</param>
/// <returns></returns>
public static void DownLoadFile(string parentpath, string filename, HttpContext httpcontext)
{
string Filepath = BaseOp.WebPathTran(parentpath);
HttpResponse response = httpcontext.Response;
HttpRequest request = httpcontext.Request;
if (File.Exists(Filepath + filename))
{
response.ContentType = "application/octet-stream";
response.AddHeader("Content-Disposition", "attachment;filename=" + httpcontext.Server.UrlEncode(filename));
response.WriteFile(Filepath + filename);
}
else
{
response.Redirect(request.ServerVariables["HTTP_REFERER"]);
}
}
/// <summary>
/// 图片格式转换
/// </summary>
/// <param name="OriFilename">原始文件相对路径</param>
/// <param name="DesiredFilename">生成目标文件相对路径</param>
/// <returns></returns>
/// JPG采用的是有损压缩所以JPG图像有可能会降低图像清晰度，而像素是不会降低的
/// GIF采用的是无损压缩所以GIF图像是不会降低原图图像清晰度和像素的，但是GIF格式只支持256色图像。
public static bool ConvertImage(string OriFilename, string DesiredFilename)
{
string extname = DesiredFilename.Substring(DesiredFilename.LastIndexOf('.') + 1).ToLower();
ImageFormat DesiredFormat;
//根据扩张名，指定ImageFormat
switch (extname)
{
case "bmp":
DesiredFormat = ImageFormat.Bmp;
break;
case "gif":
DesiredFormat = ImageFormat.Gif;
break;
case "jpeg":
DesiredFormat = ImageFormat.Jpeg;
break;
case "ico":
DesiredFormat = ImageFormat.Icon;
break;
case "png":
DesiredFormat = ImageFormat.Png;
break;
default:
DesiredFormat = ImageFormat.Jpeg;
break;
}
try
{
System.Drawing.Image imgFile = System.Drawing.Image.FromFile(BaseOp.WebPathTran(OriFilename));
imgFile.Save(BaseOp.WebPathTran(DesiredFilename), DesiredFormat);
return(true);
}
catch
{
return(false);
}
}
/// <summary>
/// 小文件下载
/// </summary>
/// <param name="filefullname">完整文件名</param>
public static void DownLoadSmallFile(string filefullname, HttpContext httpcontext)
{
HttpResponse response = httpcontext.Response;
HttpRequest request = httpcontext.Request;
string filepath = filefullname.Substring(0, filefullname.LastIndexOf("/") + 1);
string filename = filefullname.Remove(0, filepath.Length);
string Fileparentpath = BaseOp.WebPathTran(filepath);
if (File.Exists(Fileparentpath + filename))
{
response.ContentType = "application/octet-stream";
response.AddHeader("Content-Disposition", "attachment;filename=" + httpcontext.Server.UrlEncode(filename));
response.TransmitFile(Fileparentpath + filename);
}
else
{
response.Redirect(request.ServerVariables["HTTP_REFERER"]);
}
}
/// <summary>
/// 上传文件（默认文件名）
/// </summary>
/// <param name="fileUploadControl">上传控件ID</param>
/// <param name="SavePath">指定目录</param>
/// <param name="IsTimeName">启用时间重命名</param>
/// <returns></returns>
public bool UploadFile(FileUpload fileUploadControl, string SavePath, bool IsTimeName)
{
string filename = fileUploadControl.FileName;
if (IsTimeName)
{
//时间+扩展名
filename = DateTime.Now.Ticks.ToString() + filename.Substring(filename.LastIndexOf("."));
}
try
{
string FileInServerName = BaseOp.WebPathTran(SavePath) + filename;
fileUploadControl.SaveAs(FileInServerName);
return(true);
}
catch (Exception ex)
{
throw ex;
return(false);
}
}
/// <summary>
/// 图片固定大小缩放
/// </summary>
/// <param name="OriFileName">源文件相对地址</param>
/// <param name="DesiredFilename">目标文件相对地址</param>
/// <param name="IntWidth">目标文件宽</param>
/// <param name="IntHeight">目标文件高</param>
/// <param name="imageFormat">图片文件格式</param>
public static bool ChangeImageSize(string OriFileName, string DesiredFilename, int IntWidth, int IntHeight, ImageFormat imageFormat)
{
string SourceFileNameStr = BaseOp.WebPathTran(OriFileName); //来源图片名称路径
string TransferFileNameStr = BaseOp.WebPathTran(DesiredFilename); //目的图片名称路径
FileStream myOutput = null;
try
{
System.Drawing.Image.GetThumbnailImageAbort myAbort = new System.Drawing.Image.GetThumbnailImageAbort(imageAbort);
Image SourceImage = System.Drawing.Image.FromFile(OriFileName); //来源图片定义
Image TargetImage = SourceImage.GetThumbnailImage(IntWidth, IntHeight, myAbort, IntPtr.Zero); //目的图片定义
//将TargetFileNameStr的图片放宽为IntWidth，高为IntHeight
myOutput = new FileStream(TransferFileNameStr, FileMode.Create, FileAccess.Write, FileShare.Write);
TargetImage.Save(myOutput, imageFormat);
myOutput.Close();
return(true);
}
catch
{
myOutput.Close();
return(false);
}
}