protected void btnDownLoad_Click(object sender, EventArgs e)
{
System.IO.Stream iStream = null; // Buffer to read 10K bytes in chunk:
byte[] buffer = new Byte[5000000]; // Length of the file:
int length; // Total bytes to read:
long dataToRead; // Identify the file to download including its path.
//string filepath = "DownloadFileName";
string filepath = Server.MapPath("./") + "UploadedFile\\" + this.ddlInstallType.SelectedValue + "\\" + this.ddlCarType1.SelectedValue + this.ddlCarType2.SelectedValue + "-" + this.ddlCarNumber.SelectedValue;
// Identify the file name.
string filename = txtFileName.Text.Trim();
string strFilepath = filepath + "\\" + filename;
try
{
if (!File.Exists(strFilepath))
{
this.lblErrorMessage.Text = "该文件不存在.";
return;
}
// Open the file.
iStream = new System.IO.FileStream(strFilepath, System.IO.FileMode.Open,
System.IO.FileAccess.Read, System.IO.FileShare.Read);
// Total bytes to read:
dataToRead = iStream.Length; Response.ContentType = "application/octet-stream;charset=gb2321";
Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(filename));
// Read the bytes.
while (dataToRead > 0)
{
// Verify that the client is connected.
if (Response.IsClientConnected)
{
// Read the data in buffer.
length = iStream.Read(buffer, 0, 10000); // Write the data to the current output stream.
Response.OutputStream.Write(buffer, 0, length); // Flush the data to the HTML output.
Response.Flush(); buffer = new Byte[5000000];
dataToRead = dataToRead - length;
}
else
{
//prevent infinite loop if user disconnects
dataToRead = -1;
}
}
}
catch
{
// Trap the error, if any.
this.lblErrorMessage.Text = "下载失败.";
}
finally
{
if (iStream != null)
{
//Close the file.
iStream.Close();
}
}
}Q：例如我要下载后缀名为.txt的文件，为什么下载的文件连<html>这些标签都写进去了。谁能告诉我这段代码，如何修改能不写入 html标签元素
{
System.IO.Stream iStream = null; // Buffer to read 10K bytes in chunk:
byte[] buffer = new Byte[5000000]; // Length of the file:
int length; // Total bytes to read:
long dataToRead; // Identify the file to download including its path.
//string filepath = "DownloadFileName";
string filepath = Server.MapPath("./") + "UploadedFile\\" + this.ddlInstallType.SelectedValue + "\\" + this.ddlCarType1.SelectedValue + this.ddlCarType2.SelectedValue + "-" + this.ddlCarNumber.SelectedValue;
// Identify the file name.
string filename = txtFileName.Text.Trim();
string strFilepath = filepath + "\\" + filename;
try
{
if (!File.Exists(strFilepath))
{
this.lblErrorMessage.Text = "该文件不存在.";
return;
}
// Open the file.
iStream = new System.IO.FileStream(strFilepath, System.IO.FileMode.Open,
System.IO.FileAccess.Read, System.IO.FileShare.Read);
// Total bytes to read:
dataToRead = iStream.Length; Response.ContentType = "application/octet-stream;charset=gb2321";
Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(filename));
// Read the bytes.
while (dataToRead > 0)
{
// Verify that the client is connected.
if (Response.IsClientConnected)
{
// Read the data in buffer.
length = iStream.Read(buffer, 0, 10000); // Write the data to the current output stream.
Response.OutputStream.Write(buffer, 0, length); // Flush the data to the HTML output.
Response.Flush(); buffer = new Byte[5000000];
dataToRead = dataToRead - length;
}
else
{
//prevent infinite loop if user disconnects
dataToRead = -1;
}
}
}
catch
{
// Trap the error, if any.
this.lblErrorMessage.Text = "下载失败.";
}
finally
{
if (iStream != null)
{
//Close the file.
iStream.Close();
}
}
}Q：例如我要下载后缀名为.txt的文件，为什么下载的文件连<html>这些标签都写进去了。谁能告诉我这段代码，如何修改能不写入 html标签元素
另外你的BUFFER定义得太大了，一般都是1024就行了
我还提个什么问阿。next
比如你的DOWNLOAD的按钮，就传个参数给专门处理文件流输出的页面。那个页面的Aspx为空白的。就行了
我都怀疑了 干IT的 怎么出来你这么个货色。楼下看清楚， 我aspx前台的东西是必须的，不能删，要是删了，我还在这发什么贴。
搞笑
没有让你删啊！！服务器发给浏览器的都是数据流，你前台的ASPX页面的HTML这个也是数据流的一部分。所以你如果非要本页输出这个文件流，那么HTML的数据肯定和这个文件流一起通过outstream输出来的，所以你的txt里面就肯定有HTML的内容。所以让你变通下。你本页的按钮就做转向处理，转向到另一个专门处理输出文件流的空白的ASPX或者Ashx页面。（而且这样做也更加便于维护）不知道你能理解不呢？