public static IDisposable Bind(Func<XmlBindingArgs, string> f, switch_xml_section_enum_t sections) {
     switch_xml_search_function_delegate boundFunc = (section, tag, key, keyval, param, userData) => {
         var args = new XmlBindingArgs { Section = section, TagName = tag, KeyName = key, KeyValue = keyval, Parameters = new switch_event(param, false) };
         var xmlStr = f(args);
         var fsxml = string.IsNullOrEmpty(xmlStr) ? null : freeswitch.switch_xml_parse_str_dynamic(xmlStr, switch_bool_t.SWITCH_TRUE);
         return switch_xml.getCPtr(fsxml).Handle;
     };
     var fp = Marshal.GetFunctionPointerForDelegate(boundFunc);
     var swigFp = new SWIGTYPE_p_f_p_q_const__char_p_q_const__char_p_q_const__char_p_q_const__char_p_switch_event_t_p_void__p_switch_xml(fp, false);
     var res = freeswitch.switch_xml_bind_search_function_ret(swigFp, (uint)sections, null, null);
     if (res != switch_status_t.SWITCH_STATUS_SUCCESS) {
         throw new InvalidOperationException("Call to switch_xml_bind_search_function_ret failed, result: " + res + ".");
     }
     return new SwitchXmlSearchBinding(swigFp, boundFunc);
 }
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        public static IDisposable Bind(Func <XmlBindingArgs, string> f, switch_xml_section_enum_t sections)
        {
            switch_xml_search_function_delegate boundFunc = (section, tag, key, keyval, param, userData) => {
                var args = new XmlBindingArgs {
                    Section = section, TagName = tag, KeyName = key, KeyValue = keyval, Parameters = new switch_event(param, false)
                };
                var xmlStr = f(args);
                var fsxml  = string.IsNullOrEmpty(xmlStr) ? null : freeswitch.switch_xml_parse_str_dynamic(xmlStr, switch_bool_t.SWITCH_TRUE);
                return(switch_xml.getCPtr(fsxml).Handle);
            };
            var fp     = Marshal.GetFunctionPointerForDelegate(boundFunc);
            var swigFp = new SWIGTYPE_p_f_p_q_const__char_p_q_const__char_p_q_const__char_p_q_const__char_p_switch_event_t_p_void__p_switch_xml(fp, false);
            var res    = freeswitch.switch_xml_bind_search_function_ret(swigFp, (uint)sections, null, null);

            if (res != switch_status_t.SWITCH_STATUS_SUCCESS)
            {
                throw new InvalidOperationException("Call to switch_xml_bind_search_function_ret failed, result: " + res + ".");
            }
            return(new SwitchXmlSearchBinding(swigFp, boundFunc));
        }