上传控件

前台:

<form id="upload" method="post" encType="multipart/form-data" runat="server">
    <table class="border" id="uploadtable" height="99%" cellSpacing="0" cellPadding="0" width="98%"
        align="center" border="0" runat="server">
        <tr align="center" height="18">
            <td><b>文件上传</b></td>
        </tr>
        <tr height="150">
            <td class="tdbg" vAlign="top" align="center">
                <table cellSpacing="1" cellPadding="4" align="center">
                    <tr>
                        <td width="30%">选择上传文件：
                        </td>
                        <td><input class="text" id="myFile" type="file" size="25" name="myFile" runat="server">
                        </td>
                    </tr>
                    <tr>
                        <td align="center" colSpan="2"><asp:radiobuttonlist id="addto" runat="server" RepeatDirection="Horizontal">
                                <asp:ListItem Value="downfile" Selected="True">文件</asp:ListItem>
                                <asp:ListItem Value="img">图片</asp:ListItem>
                            </asp:radiobuttonlist></td>
                    </tr>
                    <tr>
                        <td>文件说明：</td>
                        <td><asp:textbox id="aboutfile" runat="server" Columns="20" CssClass="text"></asp:textbox></td>
                    </tr>
                    <tr>
                        <td align="center" colSpan="2"><asp:button id="Submit" onclick="Submit_OnClick" runat="server" text="上 传"></asp:button><input type="reset" value="重 置" name="reset">
                        </td>
                    </tr>
                </table>
                <br>
                <br>
                <asp:label id="myLabel" runat="server" text="" width="100%"></asp:label><br>
            </td>
        </tr>
    </table>
    <table class="border" id="successtable" height="99%" cellSpacing="0" cellPadding="0" width="98%"
        align="center" border="0" runat="server">
        <tr height="18">
            <td class="title" align="center"><b>上 传 成 功</b></td>
        </tr>
        <tr height="150">
            <td class="tdbg" vAlign="top">
                <span id="successinfo" runat="server"></span>
                <div align="center">
                    <input type="button" value="继续上传" name="goon" onclick="javascript:window.history.back();">
                    <input type="button" value="关 闭" name="close" onclick="javascript:window.close();">
                </div>
            </td>
        </tr>
    </table>
</form>

后台:

public string errmsg = "";
        protected bool founderr = false;

        protected System.Web.UI.WebControls.RadioButtonList addto;
        protected System.Web.UI.WebControls.TextBox aboutfile;
        protected System.Web.UI.WebControls.Button Submit;
        protected System.Web.UI.WebControls.Label myLabel;
        protected System.Web.UI.HtmlControls.HtmlTable uploadtable;
        protected System.Web.UI.HtmlControls.HtmlInputFile myFile;
        protected System.Web.UI.HtmlControls.HtmlTable successtable;
        protected System.Web.UI.HtmlControls.HtmlGenericControl successinfo;

        public string uploadtype="txt,gif,jpg,bmp,zip,rar,mht,swf,rm,mp3,wav,doc,ppt,xls";
        public string uploadsize="6000000";

        private void Page_Load(object sender, System.EventArgs e)
        {
            // 在此处放置用户代码以初始化页面
            
            uploadtable.Visible = true;
            successtable.Visible = false;
            myLabel.Text = "<blockquote><div align=left>文件类型：" + uploadtype + "<br>文件大小：" + uploadsize + " 字节</div></blockquote>";
         }

         protected void Submit_OnClick(object sender, System.EventArgs e)
         {
            string userid ="zm";
             if(myFile.PostedFile != null)
            {   
                string str_body = "";
                HttpPostedFile mFile = myFile.PostedFile;
                int fileSize = mFile.ContentLength;//上传文件大小
                if(fileSize == 0)
                {
                    myLabel.Text = "<font color=red>请选择要上传的文件！</font>";
                    return;
                }
                else if(fileSize > int.Parse(uploadsize))
                {
                    myLabel.Text = "<font color=red>您所上传的文件过大，请重新上传！</font>";
                    return;
                }
                string fileExt = mFile.FileName.Substring(mFile.FileName.Length - 3).ToLower().Replace(".","");
                if(uploadtype.ToLower() != "all")
                {
                    string uploadType = uploadtype.ToLower();
                    string[] array = uploadType.Split(new char[]{','});
                    bool cannot = true;
                    for(int i = 0; i < array.Length; i++)
                    {
                        if(fileExt == array.GetValue(i).ToString())
                        {
                            cannot = false;
                        }
                    }
                    if(cannot)
                    {
                        myLabel.Text = "<font color=red>" + fileExt + " 文件不是系统所允许上传的文件类型！</font>";
                        return;
                    }
                }
                try
                {
                    byte[] mFileByte = new Byte[fileSize];
                    mFile.InputStream.Read(mFileByte,0,fileSize);

                    string mFilename = ClientID + System.IO.Path.GetFileName(mFile.FileName);//上传文件名称
                    str_body += "上传文件名称： " + System.IO.Path.GetFileName(mFile.FileName) + " <br>";
                    str_body += "上传文件大小： " + fileSize + " 字节<br>";
                    str_body += "上传文件类型： " + mFile.ContentType + " <br>";

                    string filePath = ""; //上传文件路径
                    switch(addto.SelectedItem.Value)
                    {
                        case "img":
                            filePath = "uploadImages/";
                            break;
                        case "downfile":
                            filePath = "uploadFiles/";
                            break;
                    }
                    string y = DateTime.Now.Year.ToString();
                    string m = DateTime.Now.Month.ToString();
                    string d = DateTime.Now.Day.ToString();
                    string h = DateTime.Now.Hour.ToString();
                    string n =DateTime.Now.Minute.ToString();
                    string s = DateTime.Now.Second.ToString();
                    string Filename = y + m + d + h + n + s;
                    Random r = new Random();
                    Filename = Filename + r.Next(10000);
                    Filename = userid + Filename + "." + fileExt;
                    str_body += "上传后的文件名： " + Filename + "<br>";
                    str_body += "文件相对当前页面路径： " + filePath;

                    System.IO.FileStream saveFile = new System.IO.FileStream(Server.MapPath(filePath + Filename),System.IO.FileMode.Create);
                    // 保存文件
                    saveFile.Write(mFileByte,0,mFileByte.Length);
                    uploadtable.Visible = false;
                    successtable.Visible = true;
                    successinfo.InnerHtml = "<blockquote style=\"line-height:150%\">" + str_body + "</blockquote>";
                
                    saveFile.Close();
                }
                catch
                {
                    myLabel.Text = "<font color=red>上传文件失败！请重新再试一次。</font>";
                    return;
                }
            }
            //intRunTime = (int)(DateTime.Now - obj.dtStartTime).TotalMilliseconds;
        }