- Bulk Operations
-
Bulk Options
- Audit
- Batch
-
Column
- Coalesce Destination OnMergeUpdate Expression
- Coalesce Destination OnUpdate Expression
- Coalesce OnMergeUpdate Expression
- Coalesce OnUpdate Expression
- Column Input Expression
- Column Output Expression
- Column InputOutput Expression
- Column PrimaryKey Expression
- Column Synchronize DeleteKey Subset Expression
- Ignore OnInsert Expression
- Ignore OnMergeInsert Expression
- Ignore OnMergeMatched AndCondition Expression
- Ignore OnMergeMatched AndOneNotCondition Expression
- Ignore OnMergeUpdate Expression
- Ignore OnSynchronizeInsert Expression
- Ignore OnSynchronizeMatched AndCondition Expression
- Ignore OnSynchronizeMatched AndOneNotCondition Expression
- Ignore OnSynchronizeUpdate Expression
- Ignore OnUpdate Expression
- Ignore OnUpdateMatched AndCondition Expression
- Ignore OnUpdateMatched AndOneNotCondition Expression
- MergeMatched AndCondition Expression
- MergeMatched AndNotCondition Expression
- SynchronizeMatched AndCondition Expression
- SynchronizeMatched AndOneNotCondition Expression
- UpdateMatched AndCondition Expression
- UpdateMatched AndOneNotCondition Expression
- Context Factory
- Execute Event
- Identity
- Include Graph
- Key
- Logging
- Temproary Table
- Transaction
- Transient Error
- SQL Server
- Batch Operations
- Utilities
- C# Eval Expression
Entity Framework Extensions AllowDuplicateKeys
Definition
Gets or sets if a duplicate key is possible in the source.
context.BulkMerge(list, options => options.AllowDuplicateKeys = true);
Purpose
In a rare scenario such as importing a file, a key may be used in multiple rows.
In some provider such as SQL Server, the statement created by our library (Merge) makes it impossible to use with some duplicate keys.
By enabling this option, only the latest key is used instead.