Definition

Gets or sets columns to map with the direction InputOutput.

The key is required for operations such as BulkUpdate and BulkMerge.

Example

context.BulkMerge(list, options => 
options.ColumnInputOutputExpression = entity => new {entity.ID, entity.Code}
);

Purpose

The ColumnInputOutputExpression option lets you choose specific properties in which you want to perform the bulk operations.

By example, when importing a file, you may have not data on all properties.