blog post 2010/03/27/auto-gen-jquery-access-to-wcf-rest

part1.cs

internal static string GenerateJqueryJs()
{
    ServiceEndpointCollection endpoints =
        OperationContext.Current.Host.Description.Endpoints;
    OperationDescriptionCollection operations = null;
    Type contract = null;
    ServiceEndpoint currentEndpoint = 
               endpoints.Where(e > e.Contract.Name == 
                     OperationContext.Current.EndpointDispatcher.ContractName).FirstOrDefault();

    contract = currentEndpoint.Contract.ContractType;
    operations = currentEndpoint.Contract.Operations;

    String functions = GenerateFunctions(operations, contract);
    String classTemplate = JQueryTemplates.ClassTemplate;

    return classTemplate.Replace("{functions}", functions)
        .Replace("{class_name}", contract.Name);
}

part2.cs

private static String GenerateFunctions(OperationDescriptionCollection operations, Type contract)
{
StringBuilder js = new StringBuilder();
foreach (OperationDescription operation in operations)
{
    js.Append(Environment.NewLine);

    WebGetAttribute get = operation.Behaviors.Find<WebGetAttribute>();
    WebInvokeAttribute invoke = operation.Behaviors.Find<WebInvokeAttribute>();
    MethodInfo method = contract.GetMethod(operation.Name);

    if (get != null)
    {
        js.Append("\r\n" +
            GenerateGetMethod(JQueryTemplates.GetTemplate, get, method) + ",");
        js.Append("\r\n" +
            GenerateGetMethod(JQueryTemplates.GetByUriTemplate, get, method) + ",");
    }
    else if (invoke != null)
    {
        switch (invoke.Method)
        {
            case "PUT":
                js.Append("\r\n" +
                    GenerateInvokeMethod(JQueryTemplates.PostTemplate,invoke, method) + ",");
                break;
            case "DELETE":
                js.Append("\r\n" +
                    GenerateInvokeMethod(JQueryTemplates.DeleteTemplate,invoke, method) + ",");
                break;
            case "POST":
                js.Append("\r\n" +
                    GenerateInvokeMethod(JQueryTemplates.PostTemplate,invoke, method) + ",");
                break;
            default:
                continue;
        }
    }
    else
    {
        continue;
    }

}
return js.ToString().TrimEnd(' ', '\n', '\r', ',');
}

part3.cs

public const string GetTemplate = @"
{method_name} : function({params}successCallback, errorCallback) {
    jQuery.ajax({
        type: 'GET',
        url: {uri},
        contentType: 'application/json; charset=utf-8',
        success: function (responseText) {
            var response = eval(responseText);
            successCallback(response);
        },
        error: function (xhr, ajaxOptions, thrownError) {
            var error = eval('(' + xhr.responseText + ')');
            errorCallback(error);
        }
    });
}";

part4.cs

[WebGet(UriTemplate = "/jqueryservice.js", BodyStyle = WebMessageBodyStyle.Bare)]
[OperationContract]
public Stream Javascript()
{
    string jsFileContents = WebHttpJavascriptGenerator.GenerateJqueryJs();
    Encoding encoding = Encoding.ASCII;
    WebOperationContext.Current.OutgoingResponse.ContentType = "text/plain";
    byte[] returnBytes = encoding.GetBytes(jsFileContents);
    return new MemoryStream(returnBytes);
}