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Question

说做过文件上传与下载的程序。。asp.net的

Answer 1

fileuploat 控件拉一个就成了

Answer 2

create database FilesDB
go
use FilesDB
go
create table Files
(
Id Int IDENTITY primary key,
FileName NVarchar(50),
UpFilePath Nvarchar(255),
UpTime DateTime default getdate()
)
aspx        <asp:FileUpload ID="FileUpload1" runat="server" />
        <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="上传" />
        <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataKeyNames="Id"
            DataSourceID="SqlDataSource1" OnRowCommand="GridView1_RowCommand">
            <Columns>
                <asp:TemplateField>
                    <ItemTemplate>
                        <asp:LinkButton ID="LinkButton1" runat="server" CommandName="download" CommandArgument='<%#Eval("upFilePath") %>'>下载</asp:LinkButton>
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:CommandField ShowDeleteButton="True" />
                <asp:BoundField DataField="Id" HeaderText="Id" InsertVisible="False" ReadOnly="True"
                    SortExpression="Id" />
                <asp:BoundField DataField="FileName" HeaderText="FileName" SortExpression="FileName" />
                <asp:BoundField DataField="UpFilePath" HeaderText="UpFilePath" SortExpression="UpFilePath" />
                <asp:BoundField DataField="UpTime" HeaderText="UpTime" SortExpression="UpTime" />
            </Columns>
        </asp:GridView>
        <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="Data Source=.\SQLExpress;Initial Catalog=FilesDB;Integrated Security=True"
            DeleteCommand="DELETE FROM [Files] WHERE [Id] = @Id" InsertCommand="INSERT INTO [Files] ([FileName], [UpFilePath], [UpTime]) VALUES (@FileName, @UpFilePath, @UpTime)"
            ProviderName="System.Data.SqlClient" SelectCommand="SELECT [Id], [FileName], [UpFilePath], [UpTime] FROM [Files]"
            UpdateCommand="UPDATE [Files] SET [FileName] = @FileName, [UpFilePath] = @UpFilePath, [UpTime] = @UpTime WHERE [Id] = @Id">
            <DeleteParameters>
                <asp:Parameter Name="Id" Type="Int32" />
            </DeleteParameters>
            <UpdateParameters>
                <asp:Parameter Name="FileName" Type="String" />
                <asp:Parameter Name="UpFilePath" Type="String" />
                <asp:Parameter Name="UpTime" Type="DateTime" />
                <asp:Parameter Name="Id" Type="Int32" />
            </UpdateParameters>
            <InsertParameters>
                <asp:Parameter Name="FileName" Type="String" />
                <asp:Parameter Name="UpFilePath" Type="String" />
                <asp:Parameter Name="UpTime" Type="DateTime" />
            </InsertParameters>
        </asp:SqlDataSource>
aspx.cs        protected void Button1_Click(object sender, EventArgs e)
        {
            if (FileUpload1.HasFile)
            {
                FileUpload1.SaveAs(MapPath(FileUpload1.FileName));
                const string cnString = @"Server=.\SQLExpress;Integrated Security=True;database=FilesDB";
                SqlConnection cn = new SqlConnection(cnString);
                SqlCommand cmd = new SqlCommand("insert into Files(FileName,upFilePath,UpTime) values(@fileName, @upFilePath, getdate())", cn);
                cmd.Parameters.AddWithValue("@fileName", FileUpload1.FileName);
                cmd.Parameters.AddWithValue("@upFilePath", MapPath(FileUpload1.FileName));
                cn.Open();
                cmd.ExecuteNonQuery();
                cn.Close();                DataBind();
            }
        }        protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
        {
            if (e.CommandName == "download")
            {
                FileStream fileStream = new FileStream(e.CommandArgument.ToString(), FileMode.Open);
                long fileSize = fileStream.Length;
                Response.ContentType = "application/octet-stream";
                Response.AddHeader("Content-Disposition", "attachment; filename=\"" + HttpUtility.UrlEncode(e.CommandArgument.ToString(), System.Text.Encoding.UTF8) + "\"");
                Response.AddHeader("Content-Length", fileSize.ToString());
                byte[] fileBuffer = new byte[fileSize];
                fileStream.Read(fileBuffer, 0, (int)fileSize);
                fileStream.Close();
                Response.BinaryWrite(fileBuffer);
                Response.End(); 
            }
            DataBind();
        }

Answer 3

靠。楼上正解。。结贴给分，我来段简单的
string filepath = "", fileExtName = "", mFileName, mPath;
        System.Text.StringBuilder strMsg = new System.Text.StringBuilder("上传的文件信息:<hr color=red>");
        string s = filepath.Substring(filepath.LastIndexOf(".") + 1).ToLower();
        filepath = FileUp.PostedFile.FileName; //获取目录
        fileExtName = filepath.Substring(filepath.LastIndexOf(".") + 1);//获取扩展名 
        if (filepath.ToString()!= "" && fileExtName.ToLower() == "rar")
        {                       
            //substring获取扩展名
            try
            {
                mPath = Server.MapPath("upfile/");
                mFileName =filepath.Substring(filepath.LastIndexOf("\\") + 1);               
                FileUp.PostedFile.SaveAs(mPath + mFileName);
            }
            catch (Exception ex)
            { Response.Write(ex.Message); }
        }
        else 
        {
           Response.Write(("<script language='javascript'>alert('发生错误，上传失败，可能是上传的文件没有压缩');</script>"));
        }分吧。我也来一段。我来最简单的。

Answer 4

拜托,这不就是下载的代码么
                FileStream fileStream = new FileStream(e.CommandArgument.ToString(), FileMode.Open);
                long fileSize = fileStream.Length;
                Response.ContentType = "application/octet-stream";
                Response.AddHeader("Content-Disposition", "attachment; filename=\"" + HttpUtility.UrlEncode(e.CommandArgument.ToString(), System.Text.Encoding.UTF8) + "\"");
                Response.AddHeader("Content-Length", fileSize.ToString());
                byte[] fileBuffer = new byte[fileSize];
                fileStream.Read(fileBuffer, 0, (int)fileSize);
                fileStream.Close();
                Response.BinaryWrite(fileBuffer);
                Response.End();