获取用户控制HTML

Question

我需要获取用户控件的HTML。

目前我正在使用下面的代码。

// Approach 1
HeaderControl hControl = new HeaderControl();

StringBuilder b = new StringBuilder();
HtmlTextWriter h = new HtmlTextWriter(new StringWriter(b));

hControl.RenderControl(h);
string controlAsString = b.ToString();

// controlAsString  is "" -- Doesn't work

// ----------------------------------------------
// Approach 2
UserControl uc = new UserControl();
HeaderControl hc = (HeaderControl)uc.LoadControl("~/Views/HeaderControl.ascx");

hControl.RenderControl(h);
string controlAsString = b.ToString();

// controlAsString = "<h3>test data</h3>  - Works.

请你解释一下如何使用方法1实现这一目标，这样我就不必硬编码控件的虚拟路径。

我也尝试过uc.LoadControl（）

的其他重载

UserControl uc = new UserControl();
HeaderControl hControl = (HeaderControl)uc.LoadControl(typeof(HeaderControl), null);

// Header control has a default constructor that takes no parameters

// but no luck :(

Answer 1

b应为System.IO.StringWriter。方法1中的代码应如下所示：

var hControl = new HeaderControl();
var strWriter = new System.IO.StringWriter();
var htmlWriter = new System.Web.UI.HtmlTextWriter(strWriter);
hControl.Rendercontrol(htmlWriter);
string ControlAsString = strWriter.ToString();

这是从我在SO中写下的另一个答案的一段代码中复制而来，对我来说非常适合。