default-value

问题 Hi, According to this link the default values of WCF 4.0 is this : MaxConcurrentSessions: 16 * processorcount MaxConcurrentSessions: MaxConcurrentCalls + MaxConcurrentSessions 100 * processorcount MaxConcurrentSessions: 100 * processorcount I know, not that clear. When looking in the documentation at MSDN( WCF 4.0 ) it says this : maxConcurrentCalls : 16 maxConcurrentInstances : 26 maxConcurrentSessions : 10 If I however look at the WCF 4.5 some of the values is based on CPU like the first

问题 I have the following select box. <select id="selId"> <option id='1' value='1'>1</option> <option id='2' value='2'>2</option> <option id='3' value='3'>3</option> <option id='4' value='4'>4</option> <option id='5' value='5'>5</option> </select> In jquery I am doing the following to select the value 2 in the select box.: ... $("select#selId").find("option#2").attr("selected", "selected"); ... The same code sets the value of 2 in the select box in IE8 and Firefox. But its not working in IE9. I am

问题 I have the following select box. <select id="selId"> <option id='1' value='1'>1</option> <option id='2' value='2'>2</option> <option id='3' value='3'>3</option> <option id='4' value='4'>4</option> <option id='5' value='5'>5</option> </select> In jquery I am doing the following to select the value 2 in the select box.: ... $("select#selId").find("option#2").attr("selected", "selected"); ... The same code sets the value of 2 in the select box in IE8 and Firefox. But its not working in IE9. I am

问题 I've been trying to use type hinting more in PHP. Today I was writing a function that takes a boolean with a default parameter and I noticed that a function of the form function foo(boolean $bar = false) { var_dump($bar); } actually throws a fatal error: Default value for parameters with a class type hint can only be NULL While a function of the similar form function foo(bool $bar = false) { var_dump($bar); } does not. However, both var_dump((bool) $bar); var_dump((boolean) $bar); give the

问题 EDIT: I edited both the question and its title to be more precise. Considering the following source code: #include <vector> struct xyz { xyz() { } // empty constructor, but the compiler doesn't care xyz(const xyz& o): v(o.v) { } xyz& operator=(const xyz& o) { v=o.v; return *this; } int v; // <will be initialized to int(), which means 0 }; std::vector<xyz> test() { return std::vector<xyz>(1024); // will do a memset() :-( } ...how can I avoid the memory allocated by the vector<> to be

问题 The Django documentation mentions that you can add your own settings to django.conf.settings . So if my project's settings.py defines APPLES = 1 I can access that with settings.APPLES in my apps in that project. But if my settings.py doesn't define that value, accessing settings.APPLES obviously won't work. Is there some way to define a default value for APPLES that is used if there is no explicit setting in settings.py ? I'd like best to define the default value in the module/package that

问题 I have table as shown below. In order to workaround one default now column restriction of MySQL I used the tip as shown here CREATE TABLE IF NOT EXISTS mytable ( id INT NOT NULL AUTO_INCREMENT , create_date TIMESTAMP NULL DEFAULT '0000-00-00 00:00:00' , update_date TIMESTAMP NULL DEFAULT NOW() ON UPDATE NOW() , PRIMARY KEY (`parti_id`) ) ENGINE = InnoDB; My sql_mode does not include NO_ZERO_DATE as pointed here my output : mysql> SELECT @@sql_mode; +------------+ | @@sql_mode | +------------+

问题 I am using DefaultValue attribute for the proper PropertyGrid behavior (it shows values different from default in bold). Now if I want to serialize shown object with the use of XmlSerializer there will be no entries in xml-file for properties with default values. What is the easiest way to tell XmlSerializer to serialize these still? I need that to support "versions", so when I change default value later in the code - serialized property gets value it had serialized with, not "latest" one. I

问题 I am using DefaultValue attribute for the proper PropertyGrid behavior (it shows values different from default in bold). Now if I want to serialize shown object with the use of XmlSerializer there will be no entries in xml-file for properties with default values. What is the easiest way to tell XmlSerializer to serialize these still? I need that to support "versions", so when I change default value later in the code - serialized property gets value it had serialized with, not "latest" one. I

问题 I'm using JSON.NET as my main serializer. This is my model, look that I've setted some JSONProperties and a DefaultValue . public class AssignmentContentItem { [JsonProperty("Id")] public string Id { get; set; } [JsonProperty("Qty")] [DefaultValue(1)] public int Quantity { get; set; } } When I serialize a List<AssignmentContentItem> , it doing a good work: private static JsonSerializerSettings s = new JsonSerializerSettings { DefaultValueHandling = DefaultValueHandling.Ignore,