ColumnInputExpression

Definition

Gets or sets columns to map with the direction Input.

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

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

Purpose

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

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