嗨，我有一个问题FileHeaderEncode核查后保存文件。
我只是想验证，上传的文件实际上是一个JPEG图像，不能只是说，一个文本文件更名为。JPEG延长。
为了验证这一点，我用的方法，我称之为"DetectFileheaderEncode"。但每当我使用此方法，并尝试保存的图像，它保存的图像大小为0，因此，形象是不可用？
可以请你帮我吗？
谢谢你，
codddy
代码如下: protected void btnUpload_Click(object sender, EventArgs e)
{
String savePath = @"C:\\Users\\xx\\Desktop\\fileupload\\";
try
{
if (FileUpload1.HasFile)
{
string fileName = Server.HtmlEncode(FileUpload1.FileName);
Boolean verified = VerifyUploadJpegImage(FileUpload1);
if (verified)
{
// Append the name of the file to upload to the path.
savePath += fileName;
FileUpload1.SaveAs(savePath);
// Notify the user that their file was successfully uploaded.
lblUploadStatus.Text = "Your file was uploaded successfully.";
lblUploadStatus.ForeColor = Color.Green;
}
else
{
// Invalid upload file
// notify the user why their file was not uploaded.
lblUploadStatus.Text = "Your file was not uploaded because " +
"it is not a jpegImage";
lblUploadStatus.ForeColor = Color.Red;
}
}
else
{
lblUploadStatus.Text = "You have not specified a file.";
}
}
catch (Exception ex)
{
lblUploadStatus.Text = "ERROR:" + ex.Message;
}
}
private Boolean VerifyUploadJpegImage(FileUpload fileUpload)
{
Boolean verified = false;
String fileName = Server.HtmlEncode(fileUpload.FileName);
String extension = System.IO.Path.GetExtension(fileName);
String contentType = fileUpload.PostedFile.ContentType;
String fileheaderEncoding = DetectFileheaderEncode(fileUpload);
if (((extension == ".jpg") || (extension == ".jpeg")) && (contentType == "image/jpeg") && (fileheaderEncoding == "255216"))
{
verified = true;
}
return verified;
}
private String DetectFileheaderEncode(FileUpload fileUpload)
{
String encode = String.Empty;
System.IO.BinaryReader r = new System.IO.BinaryReader(fileUpload.PostedFile.InputStream);
string fileclass = "";
byte buffer;
try
{
buffer = r.ReadByte();
fileclass = buffer.ToString();
buffer = r.ReadByte();
fileclass += buffer.ToString();
}
catch(Exception ex)
{
}
r.Close();
encode = fileclass;
return encode;
}