The IExpressionSubstitutions interface contains properties and methods that are used to work with the collection of substitution categories.
| Property name | Brief description | |
| Category | The Category property returns the collection of substitutions, which are contained in the category with the specified index. | |
| CategoryByName | The CategoryByName property returns the collection of substitutions, which are contained in the category with the specified name. | |
| Count | The Count property returns the number of substitution categories. |
| Method name | Brief description | |
| Add | The Add method creates a new substitution category. | |
| Remove | The Remove method removes a category with all the substitutions. |
See also: