我如何从Literall Control ASP NET获得价值

Question

I have a code for input i want to get the value of Literal Control dynamically. How do i get the value of input I have selected?

Front Code

<ul id="ulTest" runat="server"></ul>


Dim a As LiteralControl = New LiteralControl("<input type = ""date"" id=""start"" name=""trip-start"" value = ""2018-07-22"" min = ""2018-01-01"" max=""2018-12-31"">")
a.ID = "as"
ulTest.Controls.Add(a)

Dim tb As TextBox = (TextBox)a.FindControl("as")
ul1.Controls.Add(New LiteralControl(a.Text))

Answer 1

A literal control represents client-side markup that gets rendered out, and should have no expectation of being able to process posted data. If you are writing a literal out that is a textbox, you can add that as a literal, but the only way to read the value from it is to use:

Request.Form("trip-start")

There will be no direct control representation other than to do:

foreach (var ctl in ulText.Controls)
{
    if (ctl is LiteralControl)
    {
       var a = (LiteralControl)ct;
       //Attempt to do something
     }
}

I don't believe that the value you entered will be posted back; it simply will be the original markup declaration. Also, you can't cast this then as a textbox; an error will occur:

var tb = (TextBox)a.FindControl("as"); //Throws Exception