提示:“/WebApplication2”应用程序中的服务器错误。
--------------------------------------------------------------------------------未将对象引用设置到对象的实例。
说明: 执行当前 Web 请求期间,出现未处理的异常。请检查堆栈跟踪信息,以了解有关该错误以及代码中导致错误的出处的详细信息。 异常详细信息: System.NullReferenceException: 未将对象引用设置到对象的实例。源错误:
行 75: {
行 76: string filepath,fileallname,onlyfilename,uppath;
行 77: filepath=fileup.PostedFile.FileName;//这一句是红色的
行 78: fileallname=filepath.Substring(filepath.LastIndexOf("\\")+1);
行 79: onlyfilename=filepath.Substring(filepath.LastIndexOf(".")+1);
ASPX文件:
<body MS_POSITIONING="GridLayout">
<form id="Form1" method="post" enctype="multipart/form-data" runat="server">
<FONT face="宋体">
<asp:label id="Label1" style="Z-INDEX: 101; LEFT: 280px; POSITION: absolute; TOP: 32px" runat="server"
ForeColor="Red">新闻添加</asp:label><asp:button id="Button1" style="Z-INDEX: 108; LEFT: 448px; POSITION: absolute; TOP: 384px" runat="server"
Text="提交新闻"></asp:button><asp:textbox id="TextBox2" style="Z-INDEX: 107; LEFT: 160px; POSITION: absolute; TOP: 144px"
runat="server" ForeColor="#FF8080" Width="392px" Height="216px" MaxLength="5" TextMode="MultiLine"></asp:textbox><asp:dropdownlist id="DropDownList1" style="Z-INDEX: 106; LEFT: 160px; POSITION: absolute; TOP: 104px"
runat="server"></asp:dropdownlist><asp:label id="Label4" style="Z-INDEX: 105; LEFT: 80px; POSITION: absolute; TOP: 104px" runat="server"
ForeColor="Blue">新闻类型:</asp:label><asp:label id="Label3" style="Z-INDEX: 104; LEFT: 88px; POSITION: absolute; TOP: 144px" runat="server"
ForeColor="#00C000">内容:</asp:label><asp:textbox id="TextBox1" style="Z-INDEX: 103; LEFT: 160px; POSITION: absolute; TOP: 64px" runat="server"
Width="392px"></asp:textbox><asp:label id="Label2" style="Z-INDEX: 102; LEFT: 80px; POSITION: absolute; TOP: 64px" runat="server"
ForeColor="Blue">标题:</asp:label></FONT></form>
<input id="fileup" name="file1" type="file" runat="server" style="Z-INDEX: 109; LEFT: 160px; POSITION: absolute; TOP: 384px">
</body>CS文件:
private void Button1_Click(object sender, System.EventArgs e)
{
string filepath,fileallname,onlyfilename,uppath;
filepath=fileup.PostedFile.FileName;
fileallname=filepath.Substring(filepath.LastIndexOf("\\")+1);
onlyfilename=filepath.Substring(filepath.LastIndexOf(".")+1);
uppath=Server.MapPath("upfiles\\");
if(filepath!="")
{
fileup.PostedFile.SaveAs(uppath+fileallname);
} if(TextBox2.Text.Length>4000)
{TextBox2.Text="字符过长";return;} if(fileallname=="")
{
SqlCommand sqlcmd=new SqlCommand("insert into newstable(newsheard,newstype,newsbody,newstime,newsviews) Values (@newsheard,@newstype,@newsbody,@newstime,@newsviews)",sqlcon);
sqlcmd.Parameters.Add("@newsheard",SqlDbType.VarChar,50);
sqlcmd.Parameters.Add("@newstype",SqlDbType.Int,4);
sqlcmd.Parameters.Add("@newsbody",SqlDbType.VarChar,4000);
sqlcmd.Parameters.Add("@newstime",SqlDbType.DateTime,8);
sqlcmd.Parameters.Add("@newsviews",SqlDbType.Int,4);
sqlcmd.Parameters["@newsheard"].Value=TextBox1.Text;
sqlcmd.Parameters["@newstype"].Value=DropDownList1.SelectedValue;
sqlcmd.Parameters["@newsbody"].Value=TextBox2.Text;
sqlcmd.Parameters["@newstime"].Value=DateTime.Now.ToString();
sqlcmd.Parameters["@newsviews"].Value=0;
sqlcmd.ExecuteNonQuery();
}
else
{
SqlCommand sqlcmd=new SqlCommand("insert into newstable(newsheard,newstype,newsbody,newstime,newsviews,image) Values (@newsheard,@newstype,@newsbody,@newstime,@newsviews,@image)",sqlcon);
sqlcmd.Parameters.Add("@newsheard",SqlDbType.VarChar,50);
sqlcmd.Parameters.Add("@newstype",SqlDbType.Int,4);
sqlcmd.Parameters.Add("@newsbody",SqlDbType.VarChar,4000);
sqlcmd.Parameters.Add("@newstime",SqlDbType.DateTime,8);
sqlcmd.Parameters.Add("@newsviews",SqlDbType.Int,4);
sqlcmd.Parameters["@newsheard"].Value=TextBox1.Text;
sqlcmd.Parameters["@newstype"].Value=DropDownList1.SelectedValue;
sqlcmd.Parameters["@newsbody"].Value=TextBox2.Text;
sqlcmd.Parameters["@newstime"].Value=DateTime.Now.ToString();
sqlcmd.Parameters["@newsviews"].Value=0;
sqlcmd.Parameters.Add("@image",SqlDbType.NVarChar,50);
sqlcmd.Parameters["@image"].Value=fileallname;
sqlcmd.ExecuteNonQuery();
} TextBox2.Text="添加完成!";
}
--------------------------------------------------------------------------------未将对象引用设置到对象的实例。
说明: 执行当前 Web 请求期间,出现未处理的异常。请检查堆栈跟踪信息,以了解有关该错误以及代码中导致错误的出处的详细信息。 异常详细信息: System.NullReferenceException: 未将对象引用设置到对象的实例。源错误:
行 75: {
行 76: string filepath,fileallname,onlyfilename,uppath;
行 77: filepath=fileup.PostedFile.FileName;//这一句是红色的
行 78: fileallname=filepath.Substring(filepath.LastIndexOf("\\")+1);
行 79: onlyfilename=filepath.Substring(filepath.LastIndexOf(".")+1);
ASPX文件:
<body MS_POSITIONING="GridLayout">
<form id="Form1" method="post" enctype="multipart/form-data" runat="server">
<FONT face="宋体">
<asp:label id="Label1" style="Z-INDEX: 101; LEFT: 280px; POSITION: absolute; TOP: 32px" runat="server"
ForeColor="Red">新闻添加</asp:label><asp:button id="Button1" style="Z-INDEX: 108; LEFT: 448px; POSITION: absolute; TOP: 384px" runat="server"
Text="提交新闻"></asp:button><asp:textbox id="TextBox2" style="Z-INDEX: 107; LEFT: 160px; POSITION: absolute; TOP: 144px"
runat="server" ForeColor="#FF8080" Width="392px" Height="216px" MaxLength="5" TextMode="MultiLine"></asp:textbox><asp:dropdownlist id="DropDownList1" style="Z-INDEX: 106; LEFT: 160px; POSITION: absolute; TOP: 104px"
runat="server"></asp:dropdownlist><asp:label id="Label4" style="Z-INDEX: 105; LEFT: 80px; POSITION: absolute; TOP: 104px" runat="server"
ForeColor="Blue">新闻类型:</asp:label><asp:label id="Label3" style="Z-INDEX: 104; LEFT: 88px; POSITION: absolute; TOP: 144px" runat="server"
ForeColor="#00C000">内容:</asp:label><asp:textbox id="TextBox1" style="Z-INDEX: 103; LEFT: 160px; POSITION: absolute; TOP: 64px" runat="server"
Width="392px"></asp:textbox><asp:label id="Label2" style="Z-INDEX: 102; LEFT: 80px; POSITION: absolute; TOP: 64px" runat="server"
ForeColor="Blue">标题:</asp:label></FONT></form>
<input id="fileup" name="file1" type="file" runat="server" style="Z-INDEX: 109; LEFT: 160px; POSITION: absolute; TOP: 384px">
</body>CS文件:
private void Button1_Click(object sender, System.EventArgs e)
{
string filepath,fileallname,onlyfilename,uppath;
filepath=fileup.PostedFile.FileName;
fileallname=filepath.Substring(filepath.LastIndexOf("\\")+1);
onlyfilename=filepath.Substring(filepath.LastIndexOf(".")+1);
uppath=Server.MapPath("upfiles\\");
if(filepath!="")
{
fileup.PostedFile.SaveAs(uppath+fileallname);
} if(TextBox2.Text.Length>4000)
{TextBox2.Text="字符过长";return;} if(fileallname=="")
{
SqlCommand sqlcmd=new SqlCommand("insert into newstable(newsheard,newstype,newsbody,newstime,newsviews) Values (@newsheard,@newstype,@newsbody,@newstime,@newsviews)",sqlcon);
sqlcmd.Parameters.Add("@newsheard",SqlDbType.VarChar,50);
sqlcmd.Parameters.Add("@newstype",SqlDbType.Int,4);
sqlcmd.Parameters.Add("@newsbody",SqlDbType.VarChar,4000);
sqlcmd.Parameters.Add("@newstime",SqlDbType.DateTime,8);
sqlcmd.Parameters.Add("@newsviews",SqlDbType.Int,4);
sqlcmd.Parameters["@newsheard"].Value=TextBox1.Text;
sqlcmd.Parameters["@newstype"].Value=DropDownList1.SelectedValue;
sqlcmd.Parameters["@newsbody"].Value=TextBox2.Text;
sqlcmd.Parameters["@newstime"].Value=DateTime.Now.ToString();
sqlcmd.Parameters["@newsviews"].Value=0;
sqlcmd.ExecuteNonQuery();
}
else
{
SqlCommand sqlcmd=new SqlCommand("insert into newstable(newsheard,newstype,newsbody,newstime,newsviews,image) Values (@newsheard,@newstype,@newsbody,@newstime,@newsviews,@image)",sqlcon);
sqlcmd.Parameters.Add("@newsheard",SqlDbType.VarChar,50);
sqlcmd.Parameters.Add("@newstype",SqlDbType.Int,4);
sqlcmd.Parameters.Add("@newsbody",SqlDbType.VarChar,4000);
sqlcmd.Parameters.Add("@newstime",SqlDbType.DateTime,8);
sqlcmd.Parameters.Add("@newsviews",SqlDbType.Int,4);
sqlcmd.Parameters["@newsheard"].Value=TextBox1.Text;
sqlcmd.Parameters["@newstype"].Value=DropDownList1.SelectedValue;
sqlcmd.Parameters["@newsbody"].Value=TextBox2.Text;
sqlcmd.Parameters["@newstime"].Value=DateTime.Now.ToString();
sqlcmd.Parameters["@newsviews"].Value=0;
sqlcmd.Parameters.Add("@image",SqlDbType.NVarChar,50);
sqlcmd.Parameters["@image"].Value=fileallname;
sqlcmd.ExecuteNonQuery();
} TextBox2.Text="添加完成!";
}
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默认的上传大小是4M.
如果需要上传更大的文件,必须采用其他方法.比如FTP,或者是其他组件比如ASPUPLOAD(不知道有没有NET版),还有,以下地址是讨论在NET中超大文件上传的,你可以去看看.下面是一些资料,你可参考一下(上面所述地址也在里面)对于asp.net,默认只允许上传2M文件,增加如下配置,一般可以自定义最大文件大小.
<httpRuntime
executionTimeout="300"
maxRequestLength="40960"
useFullyQualifiedRedirectUrl="false"/> 如果还不行,可以使用思归提供的方案:
我们在上传大文件时都遇到过这样或那样的问题。设置很大的maxRequestLength值并不能完全解决问题,
因为ASP.NET会block直到把整个文件载入内存后,再加以处理。实际上,如果文件很大的话,
我们经常会见到Internet Explorer显示 "The page cannot be displayed - Cannot find server or DNS Error",
好像是怎么也catch不了这个错误。为什么?因为这是个client side错误,server side端的Application_Error是处理不到的,
可以参考这个帖子研究一下产生这个错误的机理。
handling server error when upload file too large
解决的方法是利用隐含的HttpWorkerRequest,用它的GetPreloadedEntityBody 和 ReadEntityBody方法从IIS为ASP.NET建立的
pipe里分块读取数据 IServiceProvider provider = (IServiceProvider) HttpContext.Current; HttpWorkerRequest wr = (HttpWorkerRequest) provider.GetService(typeof(HttpWorkerRequest));
byte[] bs = wr.GetPreloadedEntityBody();
....
if (!wr.IsEntireEntityBodyIsPreloaded())
{
int n = 1024;
byte[] bs2 = new byte[n];
while (wr.ReadEntityBody(bs2,n) >0)
{
.....
}
}
Chris Hynes为我们提供了这样的一个方案(用HttpModule),该方案除了允许你上传大文件外,还能实时显示上传进度:
ASP.NET Upload Magic Part 2
这里有他讲座的PPT文件:
Uploading with ASP.NET (part 1)
Uploading with ASP.NET (part 2) 这次在项目中,用到了大文件上传,要上传的文件有100多m,于是研究现在国内使用的大文件上传的
组件发现用的比较多的有两个控件AspnetUpload 2.0和Lion.Web.UpLoadModule,另外还有思归在它的博客
堂中所说的办法 http://blog.joycode.com/saucer/archive/2004/03/16/16225.aspx
两个控件的方法是:利用隐含的HttpWorkerRequest,用它的GetPreloadedEntityBody 和 ReadEntityBody方法从IIS为ASP.NET建立的pipe里分块读取数据。Chris Hynes为我们提供了这样的一个方案(用HttpModule),该方案除了允许你上传大文件外,还能实时显示上传进度。
Lion.Web.UpLoadModule和AspnetUpload 两个.NET组件都是利用的这个方案。
当上传单文件时,两个软件的方法是一样的,继承HttpModule
HttpApplication application1 = sender as HttpApplication;
HttpWorkerRequest request1 = (HttpWorkerRequest) ((IServiceProvider) HttpContext.Current).GetService(typeof(HttpWorkerRequest));
try
{
if (application1.Context.Request.ContentType.IndexOf("multipart/form-data") <= -1)
{
return;
}
//Check The HasEntityBody
if (!request1.HasEntityBody())
{
return;
} int num1 = 0;
TimeSpan span1 = DateTime.Now.Subtract(this.beginTime); string text1 = application1.Context.Request.ContentType.ToLower(); byte[] buffer1 = Encoding.ASCII.GetBytes(("\r\n--" + text1.Substring(text1.IndexOf("boundary=") + 9)).ToCharArray());
int num2 = Convert.ToInt32(request1.GetKnownRequestHeader(11));
Progress progress1 = new Progress(); application1.Context.Items.Add("FileList", new Hashtable()); byte[] buffer2 = request1.GetPreloadedEntityBody();
num1 += buffer2.Length; string text2 = this.AnalysePreloadedEntityBody(buffer2, "UploadGUID");
if (text2 != string.Empty)
{
application1.Context.Items.Add("LionSky_UpLoadModule_UploadGUID", text2);
}
bool flag1 = true;
if ((num2 > this.UpLoadFileLength()) && ((0 > span1.TotalHours) || (span1.TotalHours > 3)))
{
flag1 = false;
}
if ((0 > span1.TotalHours) || (span1.TotalHours > 3))
{
flag1 = false;
}
string text3 = this.AnalysePreloadedEntityBody(buffer2, "UploadFolder");
ArrayList list1 = new ArrayList();
RequestStream stream1 = new RequestStream(buffer2, buffer1, null, RequestStream.FileStatus.Close, RequestStream.ReadStatus.NoRead, text3, flag1, application1.Context, string.Empty);
list1.AddRange(stream1.ReadBody);
if (text2 != string.Empty)
{
progress1.FileLength = num2;
progress1.ReceivedLength = num1;
progress1.FileName = stream1.OriginalFileName;
progress1.FileCount = ((Hashtable) application1.Context.Items["FileList"]).Count;
application1.Application["_UploadGUID_" + text2] = progress1;
}
if (!request1.IsEntireEntityBodyIsPreloaded())
{
byte[] buffer4;
ArrayList list2;
int num3 = 204800;
byte[] buffer3 = new byte[num3];
while ((num2 - num1) >= num3)
{
if (!application1.Context.Response.IsClientConnected)
{
this.ClearApplication(application1);
}
num3 = request1.ReadEntityBody(buffer3, buffer3.Length);
num1 += num3;
list2 = stream1.ContentBody;
if (list2.Count > 0)
{
buffer4 = new byte[list2.Count + buffer3.Length];
list2.CopyTo(buffer4, 0);
buffer3.CopyTo(buffer4, list2.Count);
stream1 = new RequestStream(buffer4, buffer1, stream1.FileStream, stream1.FStatus, stream1.RStatus, text3, flag1, application1.Context, stream1.OriginalFileName);
}
else
{
stream1 = new RequestStream(buffer3, buffer1, stream1.FileStream, stream1.FStatus, stream1.RStatus, text3, flag1, application1.Context, stream1.OriginalFileName);
}
list1.AddRange(stream1.ReadBody);
if (text2 != string.Empty)
{
progress1.ReceivedLength = num1;
progress1.FileName = stream1.OriginalFileName;
progress1.FileCount = ((Hashtable) application1.Context.Items["FileList"]).Count;
application1.Application["_UploadGUID_" + text2] = progress1;
}
}
buffer3 = new byte[num2 - num1];
if (!application1.Context.Response.IsClientConnected && (stream1.FStatus == RequestStream.FileStatus.Open))
{
this.ClearApplication(application1);
}
num3 = request1.ReadEntityBody(buffer3, buffer3.Length);
list2 = stream1.ContentBody;
if (list2.Count > 0)
{
buffer4 = new byte[list2.Count + buffer3.Length];
list2.CopyTo(buffer4, 0);
buffer3.CopyTo(buffer4, list2.Count);
stream1 = new RequestStream(buffer4, buffer1, stream1.FileStream, stream1.FStatus, stream1.RStatus, text3, flag1, application1.Context, stream1.OriginalFileName);
}
else
{
stream1 = new RequestStream(buffer3, buffer1, stream1.FileStream, stream1.FStatus, stream1.RStatus, text3, flag1, application1.Context, stream1.OriginalFileName);
}
list1.AddRange(stream1.ReadBody);
if (text2 != string.Empty)
{
progress1.ReceivedLength = num1 + buffer3.Length;
progress1.FileName = stream1.OriginalFileName;
progress1.FileCount = ((Hashtable) application1.Context.Items["FileList"]).Count;
if (flag1)
{
progress1.UploadStatus = Progress.UploadStatusEnum.Uploaded;
}
else
{
application1.Application.Remove("_UploadGUID_" + text2);
}
}
}
byte[] buffer5 = new byte[list1.Count];
list1.CopyTo(buffer5);
this.PopulateRequestData(request1, buffer5);
}
catch (Exception exception1)
{
this.ClearApplication(application1);
throw exception1;
}
而思归所说的方法使用Mime也能上传大文件,在以下地址下载
http://krystalware.com/files/slickupload.zip
不过觉得的思归的方法容易很多
绝对正确 记住我哦<聚点http://www.esail.cn>
<%@ Import Namespace="System.IO" %>
<html>
<script Language="VB" runat="server">
Sub OnClicks1(ByVal Sender As Object, ByVal e As EventArgs)
Dim FileName1,FileName2,FileName3,FileName4,FileName5,dFileNames.Text="文件名称为:" & MyFile.PostedFile.FileName
ContentTypes.Text="文件类型为:" & MyFile.PostedFile.ContentType
ContentLengths.Text="文件长度为:" & MyFile.PostedFile.ContentLength & "Bytes"
FileName1=MyFile.PostedFile.FileName
FileName2 = InStrRev(FileName1,"\",Len(FileName1))
FileName3=Mid(FileName1, FileName2+1)
FileName4="C:\Inetpub\wwwroot\Sample\CH06\UpLoadFiles\" & FileName3If File.Exists(FileName4) then
Label1.Text="文件已经存在!"
Else
MyFile.PostedFile.SaveAs(FileName5)
If Myfile.PostedFile.ContentLength=0 then
Label1.Text="文件上传失败"
Else
Label1.Text="文件上传成功"
End If
End If
End Sub
</script>
<body>
<form enctype="multipart/form-data" runat="server">
<input type="file" id="Myfile" runat="server"/><p>
<asp:Label id="Label1" runat="server"/><p>
<asp:Button id="MyButton1" runat="server" Text="开始上传" onClick="OnClicks1"/><p>
<asp:Label id="FileNames" runat="server"/><br>
<asp:Label id="ContentTypes" runat="server"/><br>
<asp:Label id="ContentLengths" runat="server"/><br>
</form>
</body>
</html>