C # commonly used Attribute collection (beginning ...)

ObsoleteAttribute

Namespace: System

Functions are no longer recommended.

 

FlagsAttribute

Namespace: System

[FlagsAttribute]enum class MultiHue : short{ Black = 0, Red = 1, Green = 2, Blue = 4};

All possible combinations of values of an Enum with flagsattriations:

0-Black 1-Red 2-Green 3-Red, Green 4-Blue 5-Red, Blue 6-Green, Blue 7-Red, Green, Blue 8-8

 

SerializableAttribute, NonSerializedAttribute

Namespace: System

Mark whether a field is serialized

 

DllImportAttribute

Win32 API functions

   1:  [DllImport("User32.dll", EntryPoint="MessageBox")]

   2:  static extern int MessageDialog(int hWnd, string msg, string caption, int msgType);

 

WebMethod

Namespace: System. Web. Services

The WebService method has six attributes: BufferResponse, CacheDuration, Description, EnableSession, MessageName, and TransactionOption.

   1:  [WebMethod(TransactionOption=TransactionOption.RequiresNew) ]

   2:  public void Transfer(long Amount, long AcctNumberTo, long AcctNumberFrom) 

   3:  {

   4:  }

DataObjectAttribute, DataObjectFieldAttribute, DataObjectMethodAttribute

Namespace: System. ComponentModel

[DataObjectAttribute]public class NorthwindData{ public NorthwindData() {} private int _employeeID; [DataObjectFieldAttribute(true, true, false)] public int EmployeeID { get { return _employeeID; } set { _employeeID = value; } } [DataObjectMethodAttribute(DataObjectMethodType.Select, true)] public static IEnumerable GetAllEmployees() { AccessDataSource ads = new AccessDataSource(); ads.DataSourceMode = SqlDataSourceMode.DataReader; ads.DataFile = "~//App_Data//Northwind.mdb"; ads.SelectCommand = "SELECT EmployeeID,FirstName,LastName FROM Employees"; return ads.Select(DataSourceSelectArguments.Empty); } // Delete the Employee by ID. [DataObjectMethodAttribute(DataObjectMethodType.Delete, true)] public void DeleteEmployeeByID(int employeeID) { throw new Exception("The value passed to the delete method is " + employeeID.ToString()); }}

 

AmbientValueAttribute

Namespace: System. ComponentModel

Indicates whether a property is obtained from the surrounding environment. For example, the background color of a space is automatically the background color of its parent space.

 

BindableAttribute

Namespace: System. ComponentModel

Mark whether an attribute can be bound

[Bindable(true)] public int MyProperty { get { // Insert code here. return 0; } set { // Insert code here. } }

 

BrowsableAttribute, CategoryAttribute, DisplayNameAttribute, DescriptionAttribute

DefaultEventAttribute, defaproperpropertyattribute, defavaluvalueattribute,

DesignerAttribute, DesignerCategoryAttribute, DesignTimeVisibleAttribute, and DesignOnlyAttribute

Namespace: System. ComponentModel

When designing a GUI component, you can mark attributes, events, and how the method is displayed in the designer.

Refer to: Developing Custom Data-Bound Web Server Controls for ASP. NET 2.0.

 

ConditionalAttribute

Namespace: System. Diagnostics

class Test{ static void Main() { Console.WriteLine("Calling Method1"); Method1(3); Console.WriteLine("Calling Method2"); Method2(); Console.WriteLine("Using the Debug class"); Debug.Listeners.Add(new ConsoleTraceListener()); Debug.WriteLine("DEBUG is defined"); } [Conditional("CONDITION1")] public static void Method1(int x) { Console.WriteLine("CONDITION1 is defined"); } [Conditional("CONDITION1"), Conditional("Condition2")] public static void Method2() { Console.WriteLine("CONDITION1 or Condition2 is defined"); }} /* When compiled as shown, the application (named ConsoleApp) Produces the following output. Csc ConsoleApp. cs Calling Method1 Calling Method2 Using the Debug class Csc/define: CONDITION1 ConsoleApp. cs Calling Method1 CONDITION1 is defined Calling Method2 CONDITION1 or Condition2 is defined Using the Debug class Csc/define: Condition2 ConsoleApp. cs Calling Method1 Calling Method2 CONDITION1 or Condition2 is defined Using the Debug class Csc/define: DEBUG ConsoleApp. cs Calling Method1 Calling Method2 Using the Debug class DEBUG is defined */

 

DebuggerBrowserableAttribute, DebuggerDisplayAttribute, DebuggerHiddenAttribute, MonitoringDescriptionAttribute

DebuggerNonUserCodeAttribute

DebuggerStepperBoundaryAttribute

DebuggerStepThroughAttribute

DebuggerTypeProxyAttribute

SwitchAttribute

SwitchLevelAttribute