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ContractOptionAttribute Class

ContractOptionAttribute Class

.NET Framework 4.6 and 4.5

Enables you to set contract and tool options at assembly, type, or method granularity.

System.Object
  System.Attribute
    System.Diagnostics.Contracts.ContractOptionAttribute

Namespace:  System.Diagnostics.Contracts
Assemblies:   mscorlib (in mscorlib.dll)
  System.Diagnostics.Contracts (in System.Diagnostics.Contracts.dll)

[AttributeUsageAttribute(AttributeTargets.All, AllowMultiple = true, Inherited = false)]
[ConditionalAttribute("CONTRACTS_FULL")]
public sealed class ContractOptionAttribute : Attribute

The ContractOptionAttribute type exposes the following members.

  NameDescription
Public methodContractOptionAttribute(String, String, Boolean)Initializes a new instance of the ContractOptionAttribute class by using the provided category, setting, and enable/disable value.
Public methodContractOptionAttribute(String, String, String)Initializes a new instance of the ContractOptionAttribute class by using the provided category, setting, and value.
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  NameDescription
Public propertyCategoryGets the category of the option.
Public propertyEnabledDetermines if an option is enabled.
Public propertySettingGets the setting for the option.
Public propertyTypeIdWhen implemented in a derived class, gets a unique identifier for this Attribute. (Inherited from Attribute.)
Public propertyValueGets the value for the option.
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  NameDescription
Public methodEqualsInfrastructure. Returns a value that indicates whether this instance is equal to a specified object. (Inherited from Attribute.)
Public methodGetHashCodeReturns the hash code for this instance. (Inherited from Attribute.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Public methodIsDefaultAttributeWhen overridden in a derived class, indicates whether the value of this instance is the default value for the derived class. (Inherited from Attribute.)
Public methodMatchWhen overridden in a derived class, returns a value that indicates whether this instance equals a specified object. (Inherited from Attribute.)
Public methodToStringReturns a string that represents the current object. (Inherited from Object.)
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  NameDescription
Explicit interface implemetationPrivate method_Attribute.GetIDsOfNamesMaps a set of names to a corresponding set of dispatch identifiers. (Inherited from Attribute.)
Explicit interface implemetationPrivate method_Attribute.GetTypeInfoRetrieves the type information for an object, which can be used to get the type information for an interface. (Inherited from Attribute.)
Explicit interface implemetationPrivate method_Attribute.GetTypeInfoCountRetrieves the number of type information interfaces that an object provides (either 0 or 1). (Inherited from Attribute.)
Explicit interface implemetationPrivate method_Attribute.InvokeProvides access to properties and methods exposed by an object. (Inherited from Attribute.)
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The following table shows the currently supported options.

Category

Setting

Value/effect

contract

inheritance

true to turn contract inheritance on; false to turn it off. The default is true.

runtime

checking

true to turn run-time checking on; false to turn it off. The default is true.

You can use this attribute as illustrated in the following examples.

To turn off run-time checking for the entire assembly:

[assembly:ContractOption("runtime", "checking", false)]

To turn run-time contract checking on for a specific type:

   [ContractOption("runtime", "checking", true)]
   class TypeWithRuntimeChecking {
 
       ...

To turn run-time checking off for a specific method:

// Turn off all contract inheritance from interface IList<T>
[ContractOption("contract", "inheritance", false)]
class MyConcurrentList<T> : IList<T> {
   ...
}
 
[ContractOption("runtime", "checking", false)]
public override MyMethod(int x) {
   // no inherited contracts checked at runtime,
   // no invariants checked at runtime.
   ...
}
  
       [ContractOption("runtime", "checking", false)]
       public void MethodWithoutRuntimeChecking(...) {
          ...
       }
   }

.NET Framework

Supported in: 4.6, 4.5

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
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