How to access C# class from Javascript

I have a class named book in C#. In an ASPX page (which has access to book class), I have an iframe element. I want to use Javascript from the page in the iframe, to call book.write(), but I'm not sure if I can call a C# method from a page inside an iframe using Javascript.

How I can do that?

标签： c# javascript asp.net iframe

4条回答

Summer. ? 凉城

2楼-- · 2019-08-20 04:28

You will have to make postback using javascript to the server with some parameters and then the server side can access the required class and function as per the parameter.

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3楼-- · 2019-08-20 04:39

c# = server side, JavaScript = client side. You cannot directly interact with one from the other.

The best you can do is to have some sort of postback, (through a button click, or other method) which would then call the method in your book class.

To execute JavaScript code from c#, you need to write a JavaScript call in your rendered page, from a post back.

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Evening l夕情丶

4楼-- · 2019-08-20 04:42

There's no way you can access a C# class by using JavaScript - Never, you can't do it. All you can do is use <% ... %> and then call your class method through that.

Here's an example:

Your class has a method LIKE this (note that you must declare the method as public to access it on your page):

public String Hello()
{
    return "Hello!";
}

And then you want to diplay it in your ASPX page by this:

<body>
    <form id="form1" runat="server">
        <input type="button" value="Test" onclick="alert('<%= Hello() %>')" />
    </form>
</body>

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叼着烟拽天下

5楼-- · 2019-08-20 04:45

Try AJAX,in your aspx.cs file,add this

 [WebMethod]
public static string CallCSharpCode(){
    new book().write();
}

use AJAX call the method,

 $.ajax({
    type : "POST",
    contentType : "application/json; charset=utf-8",
    url : "your aspx page.aspx/CallCSharpCode",
    dataType : "json",
    success : function (data) {
        var obj = data.d;
        //your code
    },
    error : function (result) {
        //your code
    }
 });

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How to access C# class from Javascript

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