如何创建现有用户控件的自定义控件

本文介绍了如何创建现有用户控件的自定义控件的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我已经创建了一个用户控制多文件上传，我需要创建其自定义的控制，这样我可以有控制的DLL。什么是我能做到这一点的方法是什么？

usercontrol.ascx

＆LT;脚本SRC =脚本/ jQuery的-1.4.1.min.js类型=文/ JavaScript的＆GT;＆LT; / SCRIPT＆GT;  ＆LT;脚本SRC =脚本/ jquery.MultiFile.pack.js类型=文/ JavaScript的＆GT;＆LT; / SCRIPT＆GT;    ＆LT; D​​IV＆GT;＆LT;％ - 接受属性可用于像接受=PNG | JPG - ％GT;                    多文件上传＆LT; BR /＆GT;                    ＆LT; ASP：文件上传ID =FileUpload10=服务器类=多接受=/＆GT;                    ＆LT; ASP：按钮的ID =按钮3=服务器文本=提交的OnClick =jQueryUploadFiles/＆GT;        ＆LT; BR /＆GT;        ＆LT; ASP：标签ID =lblMessage=服务器的EnableViewState =假前景色=绿色/＆GT;        ＆LT; BR /＆GT;        ＆LT; ASP：标签ID =lblError=服务器的EnableViewState =假前景色=红/＆GT;    ＆LT; / DIV＆GT;

usercontrol.ascx.cs

私人无效FileUploadUsingJQuerySelectionMethod（）        {            //如果文件被选中            HttpFileCollection文件= Request.Files;            的for（int i = 0; I＆LT; files.Count;我++）            {                HttpPostedFile文件=文件[I]                如果（file.ContentLength大于0）                {                    字符串路径= ConfigurationManager.AppSettings [文件路径];                    字符串文件名= Path.GetFileName（file.FileName）;                    //现在将文件保存到磁盘                    file.SaveAs（路径+文件名）;                    lblMessage.Text + =文件：其中; B＆gt;中+文件名+＆LT; / B＆GT;！成功上传＆LT; BR /＆gt;中;                }            }        }

我试着像下面这样：

公共类MultipleFileUpload：WebControl的{   ＃地区在此申报控制    标签lblMessage;    标签lblError;    文件上传FileUpload10;    按钮btnUpload;   #endregion    [可绑定（真）    [类别（外观）]    [默认值（）]    [本地化（真）    公共字符串的文件路径    {//道具来获得文件路径        得到        {            字符串s =（字符串）的ViewState [文件路径];            返回（（S == NULL）[+ this.ID +]：秒）;        }        组        {            的ViewState [文件路径] =值;        }    }    保护覆盖无效RenderContents（HtmlTextWriter的输出）    {        output.Write（文件路径）;    }   //这里创建您的控件布局（HTML）   //所有的HTML code＆包括LT; D​​IV＆GT;   //添加所有控件的＆lt; DIV＆gt;中低于code是非常粗略＆LT; BR /＆GT;   //你也需要注册脚本标记和脚本添加到它＆LT; BR /＆GT;    保护覆盖无效的CreateChildControls（）    {        base.CreateChildControls（）;        表的表=新表（）;        this.Controls.Add（表）;        lblMessage =新标签（）;        lblMessage.ID =lblMessage;        lblError =新标签（）;        lblError.ID =lblError;        FileUpload10 =新的FileUpload（）;        FileUpload10.ID =FileUpload10;        btnUpload =新按钮（）;        btnUpload.ID =btnUpload;        btnUpload.Text =提交＆LT; BR /＆gt;中;       // table.Controls.Add（lblMessage）;    }    //调用该方法被不断要求    私人无效FileUploadUsingJQuerySelectionMethod（）    {        //如果文件被选中        HttpFileCollection文件= HttpContext.Current.Request.Files;        的for（int i = 0; I＆LT; files.Count;我++）        {            HttpPostedFile文件=文件[I]            如果（file.ContentLength大于0）            {                路径字符串=文件路径;                字符串文件名= Path.GetFileName（file.FileName）;                //现在将文件保存到磁盘                file.SaveAs（路径+文件名）;                lblMessage.Text + =文件：其中; B＆gt;中+文件名+＆LT; / B＆GT;！成功上传＆LT; BR /＆gt;中;            }        }    }

解决方案

您可以把你的控制下在这里详细步骤一个dll：的打开一个的.ascx用户控件成可再发行自定义控件。

我认为这将是值得你的用户控件转换到正确的服务器控制，但是，它并不难，你最终会得到更易于维护code（你会看到，这个过程描述的有颇为尴尬的）。

I have created one user control for multiple file upload , i need to create its custom control so that I can have a dll of that control. What are the ways that I can do this?

usercontrol.ascx

<script src="Scripts/jquery-1.4.1.min.js" type="text/javascript"></script> <script src="Scripts/jquery.MultiFile.pack.js" type="text/javascript"></script> <div><%-- accept attribute can be used like accept="png|jpg"--%> Multiple File Upload<br /> <asp:FileUpload ID="FileUpload10" runat="server" class="multi" accept="" /> <asp:Button ID="Button3" runat="server" Text="Submit" OnClick="jQueryUploadFiles" /> <br /> <asp:Label ID="lblMessage" runat="server" EnableViewState="false" ForeColor="Green" /> <br /> <asp:Label ID="lblError" runat="server" EnableViewState="false" ForeColor="Red" /> </div>

usercontrol.ascx.cs

private void FileUploadUsingJQuerySelectionMethod() { // check if file has been selected HttpFileCollection files = Request.Files; for (int i = 0; i < files.Count; i++) { HttpPostedFile file = files[i]; if (file.ContentLength > 0) { string path = ConfigurationManager.AppSettings["FilePath"]; string fileName = Path.GetFileName(file.FileName); // now save the file to the disk file.SaveAs(path + fileName); lblMessage.Text += "File : <b>" + fileName + "</b> uploaded successfully !<br />"; } } }

I tried like following:

public class MultipleFileUpload : WebControl { #region declare controls here Label lblMessage; Label lblError; FileUpload FileUpload10; Button btnUpload; #endregion [Bindable(true)] [Category("Appearance")] [DefaultValue("")] [Localizable(true)] public string FilePath {// prop to get filepath get { String s = (String)ViewState["FilePath"]; return ((s == null) ? "[" + this.ID + "]" : s); } set { ViewState["FilePath"] = value; } } protected override void RenderContents(HtmlTextWriter output) { output.Write(FilePath); } // create the layout (html) of your control here // all the HTML code including <div> // Add all controls to the <div>, below code is very crude.<br/> // Also you need to register the script tags and add the script to it<br/> protected override void CreateChildControls() { base.CreateChildControls(); Table table = new Table(); this.Controls.Add(table); lblMessage = new Label(); lblMessage.ID = "lblMessage"; lblError = new Label(); lblError.ID = "lblError"; FileUpload10 = new FileUpload(); FileUpload10.ID = "FileUpload10"; btnUpload = new Button(); btnUpload.ID = "btnUpload"; btnUpload.Text = "Submit <br/> "; // table.Controls.Add(lblMessage); } // invoke this method were ever required private void FileUploadUsingJQuerySelectionMethod() { // check if file has been selected HttpFileCollection files = HttpContext.Current.Request.Files; for (int i = 0; i < files.Count; i++) { HttpPostedFile file = files[i]; if (file.ContentLength > 0) { string path = FilePath; string fileName = Path.GetFileName(file.FileName); // now save the file to the disk file.SaveAs(path + fileName); lblMessage.Text += "File : <b>" + fileName + "</b> uploaded successfully !<br />"; } } }

解决方案

You can put your control in a dll following the steps detailed here: Turning an .ascx User Control into a Redistributable Custom Control.

I think that it would be worth converting your user control to a proper server control, however, it's not that hard and you would end up with easier to maintain code (as you will see, the process described there is rather awkward).