求助：从表单取不出来值，上传的文件名得到的为空？

Question

表单是：
<form id="form1" runat="server" enctype="multipart/form-data">
<INPUT contentEditable="false" type="file" size="40" name="m_file" id="m_file">
<br />
<asp:Button id="Button1" runat="server" Text="上传" onclick="Button1_Click"></asp:Button>
</form>.cs中我想取到这个文件的名称，但得到的为空UploadFile my_file = m_upload.GetUploadFile("m_file");下面是用到的相关函数 public static HttpContext GetContext()
{
HttpContext context = HttpContext.Current;
if (context == null)
{
throw new Exception("HttpContext not found");
}
return context;
} public UploadFile GetUploadFile(string name)
{
            string content = WebbHelper.GetContext().Request.Form[name];//这里，我得到的值怎么都是空，应该怎么改呢？
            
            if ((content == null) || (content == string.Empty)) return null;
            if (!IsEmptyFileContent(content)) return null;
UploadFile uploadFile = new UploadFile(name);
return (uploadFile.FileName == string.Empty) ? null : uploadFile;
}
求助，如何才能获取到其值，并能保证可以正常上传呢，用的是修改过的LargeFileUpload类，主要是上传出现问题。

Answer 1

asp.net2.0中有专门上传文件的控件，用这个专门上传文件的控件好了。
如果你要使用<INPUT contentEditable="false" type="file" size="40" name="m_file" id="m_file">
，好像要在form中添加一个东西

Answer 2

在Form节里增加enctype="multipart/form-data定义

Answer 3

<INPUT contentEditable="false" type="file" size="40" name="m_file" id="m_file">
将他设为服务器控件<INPUT contentEditable="false" type="file" size="40" name="m_file" id="m_file" runat="server">后台直接用ID.的形式不就可以用了。写那么多代码干嘛？

Answer 4

在form里面加上这句话enctype="multipart/form-data

Answer 5

我觉得还是用ASP.NET封装好的上传控件比较好。

Answer 6

        FileUpload fu = (sender as Button).Parent.FindControl("FileUpload1") as FileUpload;
        string _Extend = System.IO.Path.GetExtension(fu.FileName);
        _Extend = _Extend.ToLower();
        if (_Extend == ".doc" || _Extend == ".xls" || _Extend == ".txt" || _Extend == ".jpg" || _Extend == ".gif" || _Extend == ".rar")
        {
            if (fu.HasFile)
            {
                string path = Server.MapPath(this.AppRelativeVirtualPath);
                path = string.Format("{0}\\Files", System.IO.Path.GetDirectoryName(path));
                if (!System.IO.Directory.Exists(path))
                {
                    System.IO.Directory.CreateDirectory(path);
                }                string filename = System.IO.Path.GetFileName(fu.FileName);
                fu.SaveAs(string.Format("{0}\\{1}", path, filename));
                HiddenField field = (sender as Button).Parent.FindControl("HiddenField1") as HiddenField;
                field.Value = filename;
                this.ClientScript.RegisterStartupScript(typeof(string), string.Empty, "<script>alert('文件上传成功!')</script>");
            }
        }
        else
        {
            ut.Alert("请检查上传的文件格式!\\n支持上传的文件格式有:txt,jpg,gif,xls,doc,rar", this);
            return;
        }

Answer 7

string content = WebbHelper.GetContext().Request.Form[name];//这里，我得到的值怎么都是空，应该怎么改呢？这一行完全多余。
如果你是为了要判断用户是否选择了文件，可以使用下面的代码bool fileUploaded = string.IsNullOrEmpty(System.Web.HttpContext.Current.Request.Files[0].FileName;

Answer 8

补充：我现在是想知道如何去修正取值为空的问题关于上传的结构如下：
public class UploadFile
{
#region Properties /// <summary>
/// Gets the length (in bytes) of the uploaded file.
/// </summary>
public long FileSize
{
get { return this.m_filelength; }
} /// <summary>
/// Gets the MIME content type of the uploaded file.
/// </summary>
public string ContentType
{
get { return this.m_contenttype; }
} /// <summary>
/// Gets the file name(including path) of the uploaded file as it was on the client machine.
/// </summary>
public string FileName
{
get { return this.m_filename; }
} /// <summary>
/// Gets the file name and path on client.
/// </summary>
public string ClientFullPathName
{
get{return this.m_clientName;}
}
/// <summary>
/// Gets the file extenion name.
/// </summary>
public string ExtendName
{
get
{
                return this.m_filename.Substring(this.m_filename.LastIndexOf("."));
}
}
#endregion #region Fields
private string m_contenttype;
private long m_filelength;
private string m_filename;
private string m_clientName;
private string m_filePath;
#endregion
/// <summary>
/// 
/// </summary>
/// <param name="name"></param>
public UploadFile(string i_name)
{
if(i_name == null||i_name == string.Empty)
{
return;
// throw new ArgumentNullException("i_name", "Name can not be null!");
} string m_content = string.Empty;
this.m_clientName = string.Empty;
this.m_filename = string.Empty;
this.m_contenttype = string.Empty;
this.m_filelength = 0;

if(IsContentHeader(i_name))
{
m_content = i_name;
}
else if(IsContentHeader(WebbHelper.GetContext().Request[i_name]))
{
m_content = WebbHelper.GetContext().Request[i_name];
}
if((m_content==null)||(m_content==string.Empty))
{
return;
}
//Get file info from content.
string[] contentArray = m_content.Split(';');
string m_temp = contentArray[0];
this.m_contenttype = m_temp.Substring(m_temp.IndexOf(":")+1).Trim();
m_temp = contentArray[1];
this.m_clientName = m_temp.Substring(m_temp.IndexOf("\"")+1,m_temp.LastIndexOf("\"")-m_temp.IndexOf("\"")-1).Trim();
m_temp = contentArray[2];
this.m_filename = m_temp.Substring(m_temp.IndexOf("\"")+1,m_temp.LastIndexOf("\"")-m_temp.IndexOf("\"")-1).Trim();
string uploadFolder = WebbHelper.GetUploadFolder();
//string uploadFolder = @"C:\Inetpub\wwwroot\WebbTest\Upload";
if(this.m_filename==null||this.m_filename==string.Empty) return;
this.m_filePath = Path.Combine(uploadFolder, this.m_filename);
try
{
this.m_filelength = new FileInfo(this.m_filePath).Length;
}
catch (Exception exception)
{
string uploadGuid = WebbHelper.GetContext().Request["Webb_Upload_GUID"];
if (uploadGuid != null)
{
WebbHelper.GetContext().Application.Remove(("Upload_Status_" + uploadGuid));
}
throw exception;
}
} /// <summary>
/// 
/// </summary>
/// <param name="line"></param>
/// <returns></returns>
private bool IsContentHeader(string i_line)
{
//WebbSystem.TraceMsg(line);
if((i_line == null)||(i_line == String.Empty))
{
return false;
}
string[] contentArray = i_line.Split(';'); if (contentArray.Length==3
&& contentArray[0].IndexOf("Content-Type:")>=0
&& contentArray[1].IndexOf("filename=\"")>=0
&& contentArray[2].IndexOf("filePath=\"")>=0)
{
return true;
}
return false;
} /// <summary>
/// Save file to disk.
/// </summary>
/// <param name="filename"></param>
public void SaveAs(string filename)
{
string uploadGuid = WebbHelper.GetContext().Request["Webb_Upload_GUID"];
string m_fileName = Path.GetFileName(filename);
if(m_fileName==null||m_fileName==string.Empty) return;
if(this.m_filePath==null||this.m_filePath==string.Empty) return;
try
{
UploadStatus uploadStatus;
FileInfo fileInfo = new FileInfo(this.m_filePath);
if (uploadGuid != null)
{
uploadStatus = new UploadStatus();
uploadStatus.GetUploadStatus(uploadGuid);
uploadStatus.Status = UploadStatus.UploadState.Moving;
WebbHelper.GetContext().Application[("Upload_Status_" + uploadGuid)] = uploadStatus;
} string directoryName = Path.GetDirectoryName(filename);
if (!Directory.Exists(directoryName))
{
Directory.CreateDirectory(directoryName);
}
else if (File.Exists(filename))
{
File.Delete(filename);
}
//Move temporary file to file that client uploaded. Simply change it's name.
fileInfo.MoveTo(filename);
if (uploadGuid == null)
{
return;
}
uploadStatus = new UploadStatus();
uploadStatus.GetUploadStatus(uploadGuid);
uploadStatus.Status = UploadStatus.UploadState.Completed;
WebbHelper.GetContext().Application[("Upload_Status_"+uploadGuid)]=uploadStatus;
}
catch (Exception exception)
{
if (uploadGuid != null)
{
WebbHelper.GetContext().Application.Remove(("Upload_Status_" + uploadGuid));
}
throw exception;
}
}
}怎么取值，才能从表单中得到这样的结构呢直接用UploadFile my_file = m_upload.GetUploadFile("m_file"); //m_file是表单中的一个input
得到的为什么总是空呢。

Answer 9

－－－－－－－－－－－－－－－－－－－－－－－－－－
internal class UploadStatus:IDisposable
{
public enum UploadState : byte
{
Initializing = 0,
Uploading = 1,
Uploaded = 2,
Moving = 3,
Completed = 4,
Error = 5
} #region Fields
private long m_dataLength;
private long m_readLength;
private DateTime m_beginTime;
private int m_fileCount;
private string m_fileName; //File name on client PC when uploading.
private bool m_isActive;
private string m_uploadID;
private UploadState m_status;
#endregion
        
#region properties
public TimeSpan LeftTime
{
get
{
if(this.Speed==0)
{
return System.DateTime.Now.Subtract(System.DateTime.Now);
}
else
{
long m_temp = (this.m_dataLength-this.m_readLength)/this.Speed;
return System.DateTime.Now.Subtract(System.DateTime.Now.AddSeconds(-m_temp));
}
}
}
public bool IsActive
{
get{return m_isActive;}
set{this.m_isActive=value;}
}
public string FileName
{
get{return m_fileName;}
set{this.m_fileName = value;}
}
public long Speed
{
get
{
TimeSpan m_timeSpan = DateTime.Now.Subtract(this.m_beginTime);
long m_spendSec = Convert.ToInt64(m_timeSpan.TotalSeconds);
if(m_spendSec<=0) m_spendSec = 1;
return this.m_readLength/m_spendSec;
}
}
public int FileCount
{
get{return this.m_fileCount;}
set{this.m_fileCount= value;}
}
public string UploadGUID
{
get{return this.m_uploadID;}
set{this.m_uploadID=value;}
}
public UploadState Status
{
get{return m_status;}
set{this.m_status = value;}
}
public long Percent
{
get
{
if(m_dataLength!=0)
{
return (100*m_readLength/m_dataLength);
}
return 0;
}
}
public long AllDataLength
{
get{return this.m_dataLength;}
set
{
if(value<0)
{
this.m_dataLength = 1;
}
else
{
this.m_dataLength = value;
}
}
}
public DateTime BeginTime
{
get{return this.m_beginTime;}
set{this.m_beginTime = value;}
}
public long ReadData
{
get{return this.m_readLength;}
set{this.m_readLength = value;}
}
#endregion

public UploadStatus()
{
this.m_beginTime = System.DateTime.Now;
this.m_fileCount = 0; //1
this.m_fileName = string.Empty;
this.m_dataLength = 100L; //100
this.m_readLength = 0L; //1
this.m_uploadID = Guid.NewGuid().ToString();
this.m_status = UploadState.Initializing;
this.m_isActive = true;
} public void ResetBeginTime()
{
this.m_beginTime = System.DateTime.Now;
} public void GetUploadStatus(string m_uploadGUID)
{
UploadStatus m_status = HttpContext.Current.Application[("Upload_Status_"+m_uploadGUID)] as UploadStatus;
if(m_status!=null)
{
this.m_beginTime = m_status.BeginTime;
this.m_fileCount = m_status.FileCount;
this.m_fileName = m_status.FileName;
this.m_dataLength = m_status.AllDataLength;
this.m_readLength = m_status.ReadData;
this.m_uploadID = m_status.UploadGUID;
this.m_status = m_status.Status;
this.m_isActive = true;
}
else
{
this.m_isActive = false;
}
}
#region un-initializtion and dispose
public void Dispose()
{
} ~UploadStatus()
{
}
#endregion
}这个有里面具体的结构吧。

Answer 10

回楼上的，用的就是文件上传控件ＣＳＤＮ上有提供的LargeFileUpload这个控件。

Answer 11

继续求助关于大文件上传类，现在查到原因，主要就是这个大文件上传类不知道怎么调用CSDN上下载了这个源代码，但一调试就显示什么没有集成windows认证，但在web.config中又是加入了windows这个认证的。真是奇怪。继续求达人能帮忙解决一下关于大文件传类的源码和示例，我下载的是这个：
http://download.csdn.net/source/236462