如何通过 EvaluateScriptAsync 访问 javascript 中的 c# 变量？

Question

I have ac# variable,

    double amt = 12;

and I have a Javascript piece of code

    browser1.EvaluateScriptAsync("var x='<% =amt %>';document.querySelector('.amount').value=x;");

which amends the value of the element with <%amt%>. What I want is to pass the actual c# variable's value '12' to be passed into.

and when I do

 browser1.EvaluateScriptAsync("document.querySelector('.amount').value='12';");

it gives '12' for the value of the element.

now how do I make the element to display whatever the value the c# variable takes?

Answer 1

I think you can use diffirent way.Generate a Label element which is sytle visible :false. And you can get the element value.

Like that :

 <asp:Label ID="lblHidden" runat="server"  Visible="false"></asp:Label>

 lblHidden.Text = "12";

and js

var myValue=$('#<% =lblHidden.ClientID %>').val();
browser1.EvaluateScriptAsync("var x=myValue;document.querySelector('.amount').value=x;");

Answer 2

 //directly insert the c# variable with "+" browser1.EvaluateScriptAsync("document.querySelector('.amount').value='"+c#variable+"';");

I figured out that the c# variable could be directly inserted like in the above code.