Send JSON string to a C# method

In my ASP.NET page I have the following method:

public static void UpdatePage(string accessCode, string newURL)
{
    HttpContext.Current.Cache[accessCode] = newURL;
}

It actually should receive the accessCode and newURL and update the Cache accordingly. I want to pass the values to that method from JavaScript, using an AJAX request. The code for it is as follows:

function sendUpdate() {
    var code = jsGetQueryString("code"); 
    var url = $("#url_field").val();
    var dataToSend = [ {accessCode: code, newURL: url} ];
    var options = { error: function(msg) { alert(msg.d); },
                        type: "POST", url: "li开发者_如何学编程te_host.aspx/UpdatePage",
                        data: {"items":dataToSend}, 
                        contentType: "application/json; charset=utf-8",
                        dataType: "json",
                        async: false, 
                        success: function(response) { var results = response.d; } }; 
        $.ajax(options);
}

However this doesn't seem to work. Could anybody help me figure out where the bug is?

UpdatePage is a void method that doesn't return anything, so there is nothing to look at in the response.

You could look at the HTTP return code and check that it was 200 OK or you could modify the web method:

public static bool UpdatePage(string accessCode, string newURL)
{
    bool result = true;
    try {
       HttpContext.Current.Cache[accessCode] = newURL;
    }
    catch {
        result = false;
    }

    return result
}

Edit:

It looks like your JSON arguments to the WebMethod are incorrect, you don't need the "items" in your JSON. The arguments should match your webmethod exactly.

function sendUpdate() {
       var code = jsGetQueryString("code"); 
       var url = $("#url_field").val();
       var options = { error: function(msg) { alert(msg.d); },
                       type: "POST", url: "lite_host.aspx/UpdatePage",
                       data: {'accessCode': code, 'newURL': url}, 
                       contentType: "application/json; charset=utf-8",
                       dataType: "json",
                       async: false, 
                       success: function(response) { var results = response.d; } }; 
       $.ajax(options);
}