custom-attributes | 易学教程

An attribute argument must be a constant expression, …- Create an attribute of type array

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问题 Here is my custom attribute and a class I\'m using it on: [MethodAttribute(new []{new MethodAttributeMembers(), new MethodAttributeMembers()})] public class JN_Country { } public class MethodAttribute : Attribute { public MethodAttributeMembers[] MethodAttributeMembers { get; set; } public MethodAttribute(MethodAttributeMembers[] methodAttributeMemberses) { MethodAttributeMembers = methodAttributeMemberses; } } public class MethodAttributeMembers { public string MethodName { get; set; }

Can I add custom methods/attributes to built-in Python types?

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For example—say I want to add a helloWorld() method to Python's dict type. Can I do this? JavaScript has a prototype object that behaves this way. Maybe it's bad design and I should subclass the dict object, but then it only works on the subclasses and I want it to work on any and all future dictionaries. Here's how it would go down in JavaScript: String.prototype.hello = function() { alert("Hello, " + this + "!"); } "Jed".hello() //alerts "Hello, Jed!" Here's a useful link with more examples— http://www.javascriptkit.com/javatutors/proto3.shtml You can't directly add the method to the

Exclude property from serialization via custom attribute (json.net)

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问题 I need to be able to control how/whether certain properties on a class are serialized. The simplest case is [ScriptIgnore] . However, I only want these attributes to be honored for this one specific serialization situation I am working on - if other modules downstream in the application also want to serialize these objects, none of these attributes should get in the way. So my thought is to use a custom attribute MyAttribute on the properties, and initialize the specific instance of

Get enum from enum attribute

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问题 I\'ve got public enum Als { [StringValue(\"Beantwoord\")] Beantwoord = 0, [StringValue(\"Niet beantwoord\")] NietBeantwoord = 1, [StringValue(\"Geselecteerd\")] Geselecteerd = 2, [StringValue(\"Niet geselecteerd\")] NietGeselecteerd = 3, } with public class StringValueAttribute : Attribute { private string _value; public StringValueAttribute(string value) { _value = value; } public string Value { get { return _value; } } } And I would like to put the value from the item I selected of a

How do I read an attribute on a class at runtime?

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问题 I am trying to create a generic method that will read an attribute on a class and return that value at runtime. How do would I do this? Note: DomainName attribute is of class DomainNameAttribute. [DomainName(\"MyTable\")] Public class MyClass : DomainBase {} What I am trying to generate: //This should return \"MyTable\" String DomainNameValue = GetDomainName<MyClass>(); 回答1: public string GetDomainName<T>() { var dnAttribute = typeof(T).GetCustomAttributes( typeof(DomainNameAttribute), true )

Custom HTML tag attributes are not rendered by JSF

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问题 I want to add some iOS specific tag attributes to my login-form. If I have a look on my web page source, the attributes autocorrect, autocapitalize and spellcheck aren\'t there. What is the reason for this? I am using JSF 2.x. <h:inputText id=\"user-name\" forceId=\"true\" value=\"#{login.username}\" style=\"width:120px;\" autocorrect=\"off\" autocapitalize=\"off\" spellcheck=\"false\" /> 回答1: This is by design. You can only specify attributes which are supported by the JSF component itself

Can I add custom methods/attributes to built-in Python types?

阅读更多关于 Can I add custom methods/attributes to built-in Python types?

问题 For example—say I want to add a helloWorld() method to Python\'s dict type. Can I do this? JavaScript has a prototype object that behaves this way. Maybe it\'s bad design and I should subclass the dict object, but then it only works on the subclasses and I want it to work on any and all future dictionaries. Here\'s how it would go down in JavaScript: String.prototype.hello = function() { alert(\"Hello, \" + this + \"!\"); } \"Jed\".hello() //alerts \"Hello, Jed!\" Here\'s a useful link with

ASP.NET MVC 4 Custom Authorize Attribute with Permission Codes (without roles)

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问题 I need to control the access to views based on users privilege levels (there are no roles, only privilege levels for CRUD operation levels assigned to users) in my MVC 4 application. As an example; below the AuthorizeUser will be my custom attribute and I need to use it like this: [AuthorizeUser(AccessLevels=\"Read Invoice, Update Invoice\")] public ActionResult UpdateInvoice(int invoiceId) { // some code... return View(); } [AuthorizeUser(AccessLevels=\"Create Invoice\")] public ActionResult

Custom HTML tag attributes are not rendered by JSF

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I want to add some iOS specific tag attributes to my login-form. If I have a look on my web page source, the attributes autocorrect, autocapitalize and spellcheck aren't there. What is the reason for this? I am using JSF 2.x. <h:inputText id="user-name" forceId="true" value="#{login.username}" style="width:120px;" autocorrect="off" autocapitalize="off" spellcheck="false" /> BalusC This is by design. You can only specify attributes which are supported by the JSF component itself (i.e. it's listed in the attribute list in the tag documentation ). You can't specify arbitrary additional attributes