The contextual keyword value is used in the set accessor in ordinary property declarations. It is similar to an input parameter on a method. The word value references the value that client code is attempting to assign to the property. In the following example, MyDerivedClass has a property called Name that uses the value parameter to assign a new string to the backing field name. From the point of view of client code, the operation is written as a simple assignment.
class MyBaseClass
{
// virtual auto-implemented property. Overrides can only
// provide specialized behavior if they implement get and set accessors.
public virtual string Name { get; set; }
// ordinary virtual property with backing field
private int num;
public virtual int Number
{
get { return num; }
set { num = value; }
}
}
class MyDerivedClass : MyBaseClass
{
private string name;
// Override auto-implemented property with ordinary property
// to provide specialized accessor behavior.
public override string Name
{
get
{
return name;
}
set
{
if (value != String.Empty)
{
name = value;
}
else
{
name = "Unknown";
}
}
}
}
For more information about the use of value, see Properties (C# Programming Guide).
C# Language Specification
For more information, see the C# Language Specification. The language specification is the definitive source for C# syntax and usage.
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