UserControl的RenderControl正在(C#NET)中请求一个表单标记

或者,您可以在将控件呈现为字符串的页面上禁用ServerForm/事件验证。

下面的示例说明了如何执行此操作。

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        string rawHtml = RenderUserControlToString();
    }

    private string RenderUserControlToString()
    {
        UserControl myControl = (UserControl)LoadControl("WebUserControl1.ascx");

        using (TextWriter myTextWriter = new StringWriter())
        using (HtmlTextWriter myWriter = new HtmlTextWriter(myTextWriter))
        {
            myControl.RenderControl(myWriter);

            return myTextWriter.ToString();
        }
    }

    public override void VerifyRenderingInServerForm(Control control)
    { /* Do nothing */ }

    public override bool EnableEventValidation
    {
        get { return false; }
        set { /* Do nothing */}
    }
}

我已经创建了一个新类,它继承了UserControl类,并且从中派生了我创建的所有其他“UserControl”。我将其称为formPartial(nod to Rails),这是在公共字符串renderMyHTML()方法中实现的:

TextWriter myTextWriter = new StringWriter();
HtmlTextWriter myWriter = new HtmlTextWriter(myTextWriter);

UserControl myDuplicate = new UserControl();
TextBox blankTextBox;

foreach (Control tmpControl in this.Controls)
{
    switch (tmpControl.GetType().ToString())
    {
        case "System.Web.UI.LiteralControl":
            blankLiteral = new LiteralControl();
            blankLiteral.Text = ((LiteralControl)tmpControl).Text;
            myDuplicate.Controls.Add(blankLiteral);
            break;
        case "System.Web.UI.WebControls.TextBox":
            blankTextBox = new TextBox();
            blankTextBox.ID = ((TextBox)tmpControl).ID;
            blankTextBox.Text = ((TextBox)tmpControl).Text;
            myDuplicate.Controls.Add(blankTextBox);
            break;

            // ...other types of controls (ddls, checkboxes, etc.)

    }
}

myDuplicate.RenderControl(myWriter);
return myTextWriter.ToString();

我脑海中浮现的缺点:

1. 可能的控制(或控制你)
2. 你需要把所有的钱都调走 来自 现有控件(文本框等)到
3. 没有充分利用

或者试试这个:

Page tmpPage = new TempPage(); // temporary page
Control tmpCtl = tmpPage.LoadControl( "~/UDynamicLogin.ascx" );
//the Form is null that's throws an exception
tmpPage.Form.Controls.Add( tmpCtl );

StringBuilder html = new StringBuilder();
using ( System.IO.StringWriter swr = new System.IO.StringWriter( html ) ) {
    using ( HtmlTextWriter writer = new HtmlTextWriter( swr ) ) {
        tmpPage.RenderControl( writer );
    }
}

您可以向用户控件添加表单,也可以使用常规html输入框

 <input type="text" />

http://aspadvice.com/blogs/ssmith/archive/2007/10/19/Render-User-Control-as-String-Template.aspx

    public static string RenderView<D>(string path, D dataToBind)
    {
        Page pageHolder = new Page();
        UserControl viewControl = (UserControl) pageHolder.LoadControl(path);
        if(viewControl is IRenderable<D>)
        {
            if (dataToBind != null)
            {
                ((IRenderable<D>) viewControl).PopulateData(dataToBind);
            }
        }
        pageHolder.Controls.Add(viewControl);
        StringWriter output = new StringWriter();
        HttpContext.Current.Server.Execute(pageHolder, output, false);

        return output.ToString();
    }

如果不需要,可以删除数据绑定部件。

我在使用与@TcKs类似的代码时遇到了同样的问题,但我无法使这些示例中的任何一个适用于我。我通过使用 LoadControl a方法 UserControl

UserControl uc = new UserControl();
Control c = uc.LoadControl("newUserControl.ascx");
c.RenderControl(myWriter);