从文本文件读入ListBox

Question

I want to read the values of each rows in a textfile to a ListBox control. The file needs to be uploaded on the client side.

I have the code to read from a fixed file but I don't know how to upload a file and then read from it.

The code to read from a normal file is:

protected void Button1_Click(object sender, EventArgs e)
{
    FileInfo file = new FileInfo("file");
    StreamReader stRead = file.OpenText();
    while (!stRead.EndOfStream)
    {
        ListBox1.Items.Add(stRead.ReadLine());
    }
}

Answer 1

I would do it like this if I were you. Hope this helps!

    protected void btnUpload_Click(object sender, EventArgs e)
{
    using (StreamReader stRead = new StreamReader(FileUpload1.PostedFile.InputStream))
    {
        while (!stRead.EndOfStream)
        {
            ListBox1.Items.Add(stRead.ReadLine());
        }
    }
}

BTW you'll need this in the aspx page:

    <asp:FileUpload runat="server" ID="FileUpload1"/>
    <asp:Button ID="btnUpload" runat="server" onclick="btnUpload_Click" Text="Upload" />        
    <asp:ListBox runat="server" ID="ListBox1"></asp:ListBox>

Answer 2

To get a file from the client side, you have to use a file upload control.

http://www.c-sharpcorner.com/UploadFile/mahesh/FileUpload10092005172118PM/FileUpload.aspx?ArticleID=79850d6d-0e91-4d7b-9e27-a64a09b0ee6b

The file upload has a stream of the file which you can read from. However the user will have to point to the file.