ExpressionContext Class
Provides a means of passing context state among serializers. This class cannot be inherited.
Assembly: System.Design (in System.Design.dll)
The ExpressionContext type exposes the following members.
| Name | Description | |
|---|---|---|
![]() | ExpressionContext(CodeExpression, Type, Object) | Initializes a new instance of the ExpressionContext class with the given expression and owner. |
![]() | ExpressionContext(CodeExpression, Type, Object, Object) | Initializes a new instance of the ExpressionContext class with a current value. |
| Name | Description | |
|---|---|---|
![]() | Expression | Gets the expression this context represents. |
![]() | ExpressionType | Gets the Type of the expression. |
![]() | Owner | Gets the object owning this expression. |
![]() | PresetValue | Gets the preset value of an expression. |
| Name | Description | |
|---|---|---|
![]() | Equals(Object) | Determines whether the specified Object is equal to the current Object. (Inherited from Object.) |
![]() | Finalize | Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.) |
![]() | GetHashCode | Serves as a hash function for a particular type. (Inherited from Object.) |
![]() | GetType | Gets the Type of the current instance. (Inherited from Object.) |
![]() | MemberwiseClone | Creates a shallow copy of the current Object. (Inherited from Object.) |
![]() | ToString | Returns a string that represents the current object. (Inherited from Object.) |
An ExpressionContext is placed on the context stack and contains the most relevant expression during serialization. The following C# code demonstrates an assignment.
button1.Text = "Hello";
During serialization, several serializers are responsible for creating this single statement. One of those serializers is responsible for creating "Hello". There are times when that serializer may need to know the context in which it is creating its expression. In the previous example, this context is not needed. The following C# code shows a situation in which knowledge of the context is necessary.
button1.Text = rm.GetString("button1_Text");
In this case, the serializer responsible for creating the resource expression needs to be informed of the names of the target objects. The ExpressionContext class can be used for this. As each serializer creates an expression and invokes a serializer to handle a smaller part of the statement as a whole, the serializer pushes an expression context on the context stack. Each expression context has a parent property that locates the next expression context on the stack. This provides a convenient traversal capability.
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
