Asp.net dynamically loads user-defined controls and converts them into HTML code

If the page is simply created using js, a lot of code needs to be written, and it is not intuitive.
In asp.net, we can actually create user-defined controls and return user-defined control HTML code through Ajax requests.

public static string RangerUsControl(string controlName) 
{ 
StringBuilder build = new StringBuilder(); 
HtmlTextWriter htmlWriter = new HtmlTextWriter(new StringWriter(build)); 
UserControl uc = new UserControl(); 
Control ctrl=uc.LoadControl(controlName+".ascx");//加载用户定义控件 TextBox txtBox1 = ctrl.FindControl("TextBox1") as TextBox;//获得id为“TextBox1”的控件 
txtBox1.Text = "测试"; //给控件初始化 string result; 
try 
{ 
ctrl.RenderControl(htmlWriter); 
} 
catch { } 
finally 
{ 
htmlWriter.Flush(); 
result=build.ToString(); 
} 
return result;//返回控件的HTML代码 
} 
htmlWriter.Flush();

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