# Class NpgsqlIndexBuilderExtensions

Namespace
  Microsoft.EntityFrameworkCore

Assembly
  Npgsql.EntityFrameworkCore.PostgreSQL.dll

Npgsql specific extension methods for IndexBuilder.

    public static class NpgsqlIndexBuilderExtensions

Inheritance
  object
  NpgsqlIndexBuilderExtensions

Inherited Members
  object.Equals(object)
  object.Equals(object, object)
  object.GetHashCode()
  object.GetType()
  object.MemberwiseClone()
  object.ReferenceEquals(object, object)
  object.ToString()

## Methods

### AreNullsDistinct(IConventionIndexBuilder, bool, bool)

Specifies whether for a unique index, null values should be considered distinct (not equal). The default is that they are distinct, so that a unique index could contain multiple null values in a column.

    public static IConventionIndexBuilder? AreNullsDistinct(this IConventionIndexBuilder indexBuilder, bool nullsDistinct = true, bool fromDataAnnotation = false)

#### Parameters

`indexBuilder` IConventionIndexBuilder

  The builder for the index being configured.

`nullsDistinct` bool

  Whether nulls should be considered distinct.

`fromDataAnnotation` bool

  Indicates whether the configuration was specified using a data annotation.

#### Returns

IConventionIndexBuilder

  A builder to further configure the index.

#### Remarks

https://www.postgresql.org/docs/current/sql-createindex.html

### AreNullsDistinct(IndexBuilder, bool)

Specifies whether for a unique index, null values should be considered distinct (not equal). The default is that they are distinct, so that a unique index could contain multiple null values in a column.

    public static IndexBuilder AreNullsDistinct(this IndexBuilder indexBuilder, bool nullsDistinct = true)

#### Parameters

`indexBuilder` IndexBuilder

  The builder for the index being configured.

`nullsDistinct` bool

  Whether nulls should be considered distinct.

#### Returns

IndexBuilder

  A builder to further configure the index.

#### Remarks

https://www.postgresql.org/docs/current/sql-createindex.html

### AreNullsDistinct<TEntity>(IndexBuilder<TEntity>, bool)

Specifies whether for a unique index, null values should be considered distinct (not equal). The default is that they are distinct, so that a unique index could contain multiple null values in a column.

    public static IndexBuilder<TEntity> AreNullsDistinct<TEntity>(this IndexBuilder<TEntity> indexBuilder, bool nullsDistinct = true)

#### Parameters

`indexBuilder` IndexBuilder<TEntity>

  The builder for the index being configured.

`nullsDistinct` bool

  Whether nulls should be considered distinct.

#### Returns

IndexBuilder<TEntity>

  A builder to further configure the index.

#### Type Parameters

`TEntity`

#### Remarks

https://www.postgresql.org/docs/current/sql-createindex.html

### CanSetAreNullsDistinct(IConventionIndexBuilder, bool, bool)

Specifies whether for a unique index, null values should be considered distinct (not equal). The default is that they are distinct, so that a unique index could contain multiple null values in a column.

    public static bool CanSetAreNullsDistinct(this IConventionIndexBuilder indexBuilder, bool nullsDistinct = true, bool fromDataAnnotation = false)

#### Parameters

`indexBuilder` IConventionIndexBuilder

  The builder for the index being configured.

`nullsDistinct` bool

  Whether nulls should be considered distinct.

`fromDataAnnotation` bool

  Indicates whether the configuration was specified using a data annotation.

#### Returns

bool

  `true` if the index can be configured with the method

#### Remarks

https://www.postgresql.org/docs/current/sql-createindex.html

### CanSetCollation(IConventionIndexBuilder, IReadOnlyList<string>?, bool)

Returns a value indicating whether the PostgreSQL index collation can be set.

    public static bool CanSetCollation(this IConventionIndexBuilder indexBuilder, IReadOnlyList<string>? values, bool fromDataAnnotation)

#### Parameters

`indexBuilder` IConventionIndexBuilder

  The builder for the index being configured.

`values` IReadOnlyList<string>

  The sort options to use for each column.

`fromDataAnnotation` bool

  Indicates whether the configuration was specified using a data annotation.

#### Returns

bool

  A builder to further configure the index.

#### Remarks

https://www.postgresql.org/docs/current/static/indexes-collations.html

### CanSetIncludeProperties(IConventionIndexBuilder, IReadOnlyList<string>?, bool)

Returns a value indicating whether the given include properties can be set.

    public static bool CanSetIncludeProperties(this IConventionIndexBuilder indexBuilder, IReadOnlyList<string>? propertyNames, bool fromDataAnnotation = false)

#### Parameters

`indexBuilder` IConventionIndexBuilder

  The builder for the index being configured.

`propertyNames` IReadOnlyList<string>

  An array of property names to be used in 'include' clause.

`fromDataAnnotation` bool

  Indicates whether the configuration was specified using a data annotation.

#### Returns

bool

  `true` if the given include properties can be set.

### CanSetIsCreatedConcurrently(IConventionIndexBuilder, bool?, bool)

Returns a value indicating whether concurrent creation for the index can be set.

    public static bool CanSetIsCreatedConcurrently(this IConventionIndexBuilder indexBuilder, bool? createdConcurrently, bool fromDataAnnotation = false)

#### Parameters

`indexBuilder` IConventionIndexBuilder

  The builder for the index being configured.

`createdConcurrently` bool?

  A value indicating whether the index is created with the "concurrently" option.

`fromDataAnnotation` bool

  Indicates whether the configuration was specified using a data annotation.

#### Returns

bool

  A builder to further configure the index.

#### Remarks

https://www.postgresql.org/docs/current/sql-createindex.html#SQL-CREATEINDEX-CONCURRENTLY

### CanSetIsTsVectorExpressionIndex(IConventionIndexBuilder, string?, bool)

Returns a value indicating whether the index can be configured as a full-text tsvector expression index.

    public static bool CanSetIsTsVectorExpressionIndex(this IConventionIndexBuilder indexBuilder, string? config, bool fromDataAnnotation = false)

#### Parameters

`indexBuilder` IConventionIndexBuilder

  The builder for the index being configured.

`config` string

  The text search configuration for this generated tsvector property, or `null` if this is not a generated tsvector property.

  See https://www.postgresql.org/docs/current/textsearch-controls.html for more information.

`fromDataAnnotation` bool

  Indicates whether the configuration was specified using a data annotation.

#### Returns

bool

  `true` if the index can be configured as a full-text tsvector expression index.

### CanSetMethod(IConventionIndexBuilder, string?, bool)

The PostgreSQL index method to be used. Null selects the default (currently btree).

    public static bool CanSetMethod(this IConventionIndexBuilder indexBuilder, string? method, bool fromDataAnnotation = false)

#### Parameters

`indexBuilder` IConventionIndexBuilder

  The builder for the index being configured.

`method` string

  The name of the index.

`fromDataAnnotation` bool

  Indicates whether the configuration was specified using a data annotation.

#### Returns

bool

  `true` if the index can be configured with the method

#### Remarks

http://www.postgresql.org/docs/current/static/sql-createindex.html

### CanSetNullSortOrder(IConventionIndexBuilder, IReadOnlyList<NullSortOrder>?, bool)

Returns a value indicating whether the PostgreSQL index null sort ordering can be set.

    public static bool CanSetNullSortOrder(this IConventionIndexBuilder indexBuilder, IReadOnlyList<NullSortOrder>? values, bool fromDataAnnotation)

#### Parameters

`indexBuilder` IConventionIndexBuilder

  The builder for the index being configured.

`values` IReadOnlyList<NullSortOrder>

  The sort order to use for each column.

`fromDataAnnotation` bool

  Indicates whether the configuration was specified using a data annotation.

#### Returns

bool

  A builder to further configure the index.

#### Remarks

https://www.postgresql.org/docs/current/static/indexes-ordering.html

### CanSetOperators(IConventionIndexBuilder, IReadOnlyList<string>?, bool)

Returns a value indicating whether the PostgreSQL index operators can be set.

    public static bool CanSetOperators(this IConventionIndexBuilder indexBuilder, IReadOnlyList<string>? operators, bool fromDataAnnotation)

#### Parameters

`indexBuilder` IConventionIndexBuilder

  The builder for the index being configured.

`operators` IReadOnlyList<string>

  The operators to use for each column.

`fromDataAnnotation` bool

  Indicates whether the configuration was specified using a data annotation.

#### Returns

bool

  `true` if the index can be configured with the method.

#### Remarks

https://www.postgresql.org/docs/current/static/indexes-opclass.html

### CanSetStorageParameter(IConventionIndexBuilder, string, object?, bool)

Returns a value indicating whether the PostgreSQL storage parameter is set on the table created for this entity.

    public static bool CanSetStorageParameter(this IConventionIndexBuilder indexBuilder, string parameterName, object? parameterValue, bool fromDataAnnotation = false)

#### Parameters

`indexBuilder` IConventionIndexBuilder

  The builder for the index being configured.

`parameterName` string

  The name of the storage parameter.

`parameterValue` object

  The value of the storage parameter.

`fromDataAnnotation` bool

  Indicates whether the configuration was specified using a data annotation.

#### Returns

bool

  `true` if the index can be configured as with the storage parameter.

#### Remarks

See https://www.postgresql.org/docs/current/static/sql-createtable.html#SQL-CREATETABLE-STORAGE-PARAMETERS

### HasMethod(IConventionIndexBuilder, string?, bool)

The PostgreSQL index method to be used. Null selects the default (currently btree).

    public static IConventionIndexBuilder? HasMethod(this IConventionIndexBuilder indexBuilder, string? method, bool fromDataAnnotation = false)

#### Parameters

`indexBuilder` IConventionIndexBuilder

  The builder for the index being configured.

`method` string

  The name of the index.

`fromDataAnnotation` bool

  Indicates whether the configuration was specified using a data annotation.

#### Returns

IConventionIndexBuilder

  A builder to further configure the index.

#### Remarks

http://www.postgresql.org/docs/current/static/sql-createindex.html

### HasMethod(IndexBuilder, string?)

The PostgreSQL index method to be used. Null selects the default (currently btree).

    public static IndexBuilder HasMethod(this IndexBuilder indexBuilder, string? method)

#### Parameters

`indexBuilder` IndexBuilder

  The builder for the index being configured.

`method` string

  The name of the index.

#### Returns

IndexBuilder

  A builder to further configure the index.

#### Remarks

http://www.postgresql.org/docs/current/static/sql-createindex.html

### HasMethod<TEntity>(IndexBuilder<TEntity>, string?)

The PostgreSQL index method to be used. Null selects the default (currently btree).

    public static IndexBuilder<TEntity> HasMethod<TEntity>(this IndexBuilder<TEntity> indexBuilder, string? method)

#### Parameters

`indexBuilder` IndexBuilder<TEntity>

  The builder for the index being configured.

`method` string

  The name of the index.

#### Returns

IndexBuilder<TEntity>

  A builder to further configure the index.

#### Type Parameters

`TEntity`

#### Remarks

http://www.postgresql.org/docs/current/static/sql-createindex.html

### HasNullSortOrder(IConventionIndexBuilder, IReadOnlyList<NullSortOrder>?, bool)

The PostgreSQL index NULL sort ordering to be used.

    public static IConventionIndexBuilder? HasNullSortOrder(this IConventionIndexBuilder indexBuilder, IReadOnlyList<NullSortOrder>? values, bool fromDataAnnotation)

#### Parameters

`indexBuilder` IConventionIndexBuilder

  The builder for the index being configured.

`values` IReadOnlyList<NullSortOrder>

  The sort order to use for each column.

`fromDataAnnotation` bool

  Indicates whether the configuration was specified using a data annotation.

#### Returns

IConventionIndexBuilder

  A builder to further configure the index.

#### Remarks

https://www.postgresql.org/docs/current/static/indexes-ordering.html

### HasNullSortOrder(IndexBuilder, params NullSortOrder[]?)

The PostgreSQL index NULL sort ordering to be used.

    public static IndexBuilder HasNullSortOrder(this IndexBuilder indexBuilder, params NullSortOrder[]? values)

#### Parameters

`indexBuilder` IndexBuilder

  The builder for the index being configured.

`values` NullSortOrder[]

  The sort order to use for each column.

#### Returns

IndexBuilder

  A builder to further configure the index.

#### Remarks

https://www.postgresql.org/docs/current/static/indexes-ordering.html

### HasNullSortOrder<TEntity>(IndexBuilder<TEntity>, params NullSortOrder[]?)

The PostgreSQL index NULL sort ordering to be used.

    public static IndexBuilder<TEntity> HasNullSortOrder<TEntity>(this IndexBuilder<TEntity> indexBuilder, params NullSortOrder[]? values)

#### Parameters

`indexBuilder` IndexBuilder<TEntity>

  The builder for the index being configured.

`values` NullSortOrder[]

  The sort order to use for each column.

#### Returns

IndexBuilder<TEntity>

  A builder to further configure the index.

#### Type Parameters

`TEntity`

#### Remarks

https://www.postgresql.org/docs/current/static/indexes-ordering.html

### HasOperators(IConventionIndexBuilder, IReadOnlyList<string>?, bool)

The PostgreSQL index operators to be used.

    public static IConventionIndexBuilder? HasOperators(this IConventionIndexBuilder indexBuilder, IReadOnlyList<string>? operators, bool fromDataAnnotation)

#### Parameters

`indexBuilder` IConventionIndexBuilder

  The builder for the index being configured.

`operators` IReadOnlyList<string>

  The operators to use for each column.

`fromDataAnnotation` bool

  Indicates whether the configuration was specified using a data annotation.

#### Returns

IConventionIndexBuilder

  A builder to further configure the index.

#### Remarks

https://www.postgresql.org/docs/current/static/indexes-opclass.html

### HasOperators(IndexBuilder, params string[]?)

The PostgreSQL index operators to be used.

    public static IndexBuilder HasOperators(this IndexBuilder indexBuilder, params string[]? operators)

#### Parameters

`indexBuilder` IndexBuilder

  The builder for the index being configured.

`operators` string[]

  The operators to use for each column.

#### Returns

IndexBuilder

  A builder to further configure the index.

#### Remarks

https://www.postgresql.org/docs/current/static/indexes-opclass.html

### HasOperators<TEntity>(IndexBuilder<TEntity>, params string[]?)

The PostgreSQL index operators to be used.

    public static IndexBuilder<TEntity> HasOperators<TEntity>(this IndexBuilder<TEntity> indexBuilder, params string[]? operators)

#### Parameters

`indexBuilder` IndexBuilder<TEntity>

  The builder for the index being configured.

`operators` string[]

  The operators to use for each column.

#### Returns

IndexBuilder<TEntity>

  A builder to further configure the index.

#### Type Parameters

`TEntity`

#### Remarks

https://www.postgresql.org/docs/current/static/indexes-opclass.html

### HasStorageParameter(IConventionIndexBuilder, string, object?, bool)

Sets a PostgreSQL storage parameter on the index.

    public static IConventionIndexBuilder? HasStorageParameter(this IConventionIndexBuilder indexBuilder, string parameterName, object? parameterValue, bool fromDataAnnotation = false)

#### Parameters

`indexBuilder` IConventionIndexBuilder

  The builder for the index being configured.

`parameterName` string

  The name of the storage parameter.

`parameterValue` object

  The value of the storage parameter.

`fromDataAnnotation` bool

  Indicates whether the configuration was specified using a data annotation.

#### Returns

IConventionIndexBuilder

  `true` if the index can be configured with the method

#### Remarks

See https://www.postgresql.org/docs/current/sql-createindex.html#SQL-CREATEINDEX-STORAGE-PARAMETERS

### HasStorageParameter(IndexBuilder, string, object?)

Sets a PostgreSQL storage parameter on the index.

    public static IndexBuilder HasStorageParameter(this IndexBuilder indexBuilder, string parameterName, object? parameterValue)

#### Parameters

`indexBuilder` IndexBuilder

  The builder for the index being configured.

`parameterName` string

  The name of the storage parameter.

`parameterValue` object

  The value of the storage parameter.

#### Returns

IndexBuilder

  The same builder instance so that multiple calls can be chained.

#### Remarks

See https://www.postgresql.org/docs/current/sql-createindex.html#SQL-CREATEINDEX-STORAGE-PARAMETERS

### HasStorageParameter<TEntity>(IndexBuilder<TEntity>, string, object?)

Sets a PostgreSQL storage parameter on the index.

    public static IndexBuilder<TEntity> HasStorageParameter<TEntity>(this IndexBuilder<TEntity> indexBuilder, string parameterName, object? parameterValue) where TEntity : class

#### Parameters

`indexBuilder` IndexBuilder<TEntity>

  The builder for the index being configured.

`parameterName` string

  The name of the storage parameter.

`parameterValue` object

  The value of the storage parameter.

#### Returns

IndexBuilder<TEntity>

  The same builder instance so that multiple calls can be chained.

#### Type Parameters

`TEntity`

#### Remarks

See https://www.postgresql.org/docs/current/sql-createindex.html#SQL-CREATEINDEX-STORAGE-PARAMETERS

### IncludeProperties(IConventionIndexBuilder, IReadOnlyList<string>, bool)

Adds an INCLUDE clause to the index definition with the specified property names. This clause specifies a list of columns which will be included as a non-key part in the index.

    public static IConventionIndexBuilder? IncludeProperties(this IConventionIndexBuilder indexBuilder, IReadOnlyList<string> propertyNames, bool fromDataAnnotation = false)

#### Parameters

`indexBuilder` IConventionIndexBuilder

  The builder for the index being configured.

`propertyNames` IReadOnlyList<string>

  An array of property names to be used in INCLUDE clause.

`fromDataAnnotation` bool

  Indicates whether the configuration was specified using a data annotation.

#### Returns

IConventionIndexBuilder

  A builder to further configure the index.

#### Remarks

https://www.postgresql.org/docs/current/sql-createindex.html

### IncludeProperties(IndexBuilder, params string[])

Adds an INCLUDE clause to the index definition with the specified property names. This clause specifies a list of columns which will be included as a non-key part in the index.

    public static IndexBuilder IncludeProperties(this IndexBuilder indexBuilder, params string[] propertyNames)

#### Parameters

`indexBuilder` IndexBuilder

  The builder for the index being configured.

`propertyNames` string[]

  An array of property names to be used in INCLUDE clause.

#### Returns

IndexBuilder

  A builder to further configure the index.

#### Remarks

https://www.postgresql.org/docs/current/sql-createindex.html

### IncludeProperties<TEntity>(IndexBuilder<TEntity>, Expression<Func<TEntity, object>>)

Adds an INCLUDE clause to the index definition with property names from the specified expression. This clause specifies a list of columns which will be included as a non-key part in the index.

    public static IndexBuilder<TEntity> IncludeProperties<TEntity>(this IndexBuilder<TEntity> indexBuilder, Expression<Func<TEntity, object>> includeExpression)

#### Parameters

`indexBuilder` IndexBuilder<TEntity>

  The builder for the index being configured.

`includeExpression` Expression<Func<TEntity, object>>

  A lambda expression representing the property(s) to be included in the INCLUDE clause (`blog => blog.Url`).

  If multiple properties are to be included then specify an anonymous type including the properties (`post => new { post.Title, post.BlogId }`).

#### Returns

IndexBuilder<TEntity>

  A builder to further configure the index.

#### Type Parameters

`TEntity`

#### Remarks

https://www.postgresql.org/docs/current/sql-createindex.html

### IncludeProperties<TEntity>(IndexBuilder<TEntity>, params string[])

Adds an INCLUDE clause to the index definition with the specified property names. This clause specifies a list of columns which will be included as a non-key part in the index.

    public static IndexBuilder<TEntity> IncludeProperties<TEntity>(this IndexBuilder<TEntity> indexBuilder, params string[] propertyNames)

#### Parameters

`indexBuilder` IndexBuilder<TEntity>

  The builder for the index being configured.

`propertyNames` string[]

  An array of property names to be used in INCLUDE clause.

#### Returns

IndexBuilder<TEntity>

  A builder to further configure the index.

#### Type Parameters

`TEntity`

#### Remarks

https://www.postgresql.org/docs/current/sql-createindex.html

### IsCreatedConcurrently(IConventionIndexBuilder, bool?, bool)

When this option is used, PostgreSQL will build the index without taking any locks that prevent concurrent inserts, updates, or deletes on the table; whereas a standard index build locks out writes (but not reads) on the table until it's done.

    public static IConventionIndexBuilder? IsCreatedConcurrently(this IConventionIndexBuilder indexBuilder, bool? createdConcurrently, bool fromDataAnnotation = false)

#### Parameters

`indexBuilder` IConventionIndexBuilder

  The builder for the index being configured.

`createdConcurrently` bool?

  A value indicating whether the index is created with the "concurrently" option.

`fromDataAnnotation` bool

  Indicates whether the configuration was specified using a data annotation.

#### Returns

IConventionIndexBuilder

  A builder to further configure the index.

#### Remarks

https://www.postgresql.org/docs/current/sql-createindex.html#SQL-CREATEINDEX-CONCURRENTLY

### IsCreatedConcurrently(IndexBuilder, bool)

When this option is used, PostgreSQL will build the index without taking any locks that prevent concurrent inserts, updates, or deletes on the table; whereas a standard index build locks out writes (but not reads) on the table until it's done.

    public static IndexBuilder IsCreatedConcurrently(this IndexBuilder indexBuilder, bool createdConcurrently = true)

#### Parameters

`indexBuilder` IndexBuilder

  The builder for the index being configured.

`createdConcurrently` bool

  A value indicating whether the index is created with the "concurrently" option.

#### Returns

IndexBuilder

  A builder to further configure the index.

#### Remarks

https://www.postgresql.org/docs/current/sql-createindex.html#SQL-CREATEINDEX-CONCURRENTLY

### IsCreatedConcurrently<TEntity>(IndexBuilder<TEntity>, bool)

When this option is used, PostgreSQL will build the index without taking any locks that prevent concurrent inserts, updates, or deletes on the table; whereas a standard index build locks out writes (but not reads) on the table until it's done.

    public static IndexBuilder<TEntity> IsCreatedConcurrently<TEntity>(this IndexBuilder<TEntity> indexBuilder, bool createdConcurrently = true)

#### Parameters

`indexBuilder` IndexBuilder<TEntity>

  The builder for the index being configured.

`createdConcurrently` bool

  A value indicating whether the index is created with the "concurrently" option.

#### Returns

IndexBuilder<TEntity>

  A builder to further configure the index.

#### Type Parameters

`TEntity`

#### Remarks

https://www.postgresql.org/docs/current/sql-createindex.html#SQL-CREATEINDEX-CONCURRENTLY

### IsTsVectorExpressionIndex(IConventionIndexBuilder, string?)

Configures this index to be a full-text tsvector expression index.

    public static IConventionIndexBuilder? IsTsVectorExpressionIndex(this IConventionIndexBuilder indexBuilder, string? config)

#### Parameters

`indexBuilder` IConventionIndexBuilder

  The builder for the index being configured.

`config` string

  The text search configuration for this generated tsvector property, or `null` if this is not a generated tsvector property.

  See https://www.postgresql.org/docs/current/textsearch-controls.html for more information.

#### Returns

IConventionIndexBuilder

  The same builder instance if the configuration was applied, `null` otherwise.

### IsTsVectorExpressionIndex(IndexBuilder, string)

Configures this index to be a full-text tsvector expression index.

    public static IndexBuilder IsTsVectorExpressionIndex(this IndexBuilder indexBuilder, string config)

#### Parameters

`indexBuilder` IndexBuilder

  The builder for the index being configured.

`config` string

  The text search configuration for this generated tsvector property, or `null` if this is not a generated tsvector property.

  See https://www.postgresql.org/docs/current/textsearch-controls.html for more information.

#### Returns

IndexBuilder

  A builder to further configure the index.

### IsTsVectorExpressionIndex<TEntity>(IndexBuilder<TEntity>, string)

Configures this index to be a full-text tsvector expression index.

    public static IndexBuilder<TEntity> IsTsVectorExpressionIndex<TEntity>(this IndexBuilder<TEntity> indexBuilder, string config)

#### Parameters

`indexBuilder` IndexBuilder<TEntity>

  The builder for the index being configured.

`config` string

  The text search configuration for this generated tsvector property, or `null` if this is not a generated tsvector property.

  See https://www.postgresql.org/docs/current/textsearch-controls.html for more information.

#### Returns

IndexBuilder<TEntity>

  A builder to further configure the index.

#### Type Parameters

`TEntity`

### UseCollation(IConventionIndexBuilder, IReadOnlyList<string>?, bool)

The PostgreSQL index collation to be used.

    public static IConventionIndexBuilder? UseCollation(this IConventionIndexBuilder indexBuilder, IReadOnlyList<string>? values, bool fromDataAnnotation)

#### Parameters

`indexBuilder` IConventionIndexBuilder

  The builder for the index being configured.

`values` IReadOnlyList<string>

  The sort options to use for each column.

`fromDataAnnotation` bool

  Indicates whether the configuration was specified using a data annotation.

#### Returns

IConventionIndexBuilder

  A builder to further configure the index.

#### Remarks

https://www.postgresql.org/docs/current/static/indexes-collations.html

### UseCollation(IndexBuilder, params string[]?)

The PostgreSQL index collation to be used.

    public static IndexBuilder UseCollation(this IndexBuilder indexBuilder, params string[]? values)

#### Parameters

`indexBuilder` IndexBuilder

  The builder for the index being configured.

`values` string[]

  The sort options to use for each column.

#### Returns

IndexBuilder

  A builder to further configure the index.

#### Remarks

https://www.postgresql.org/docs/current/static/indexes-collations.html

### UseCollation<TEntity>(IndexBuilder<TEntity>, params string[]?)

The PostgreSQL index collation to be used.

    public static IndexBuilder<TEntity> UseCollation<TEntity>(this IndexBuilder<TEntity> indexBuilder, params string[]? values)

#### Parameters

`indexBuilder` IndexBuilder<TEntity>

  The builder for the index being configured.

`values` string[]

  The sort options to use for each column.

#### Returns

IndexBuilder<TEntity>

  A builder to further configure the index.

#### Type Parameters

`TEntity`

#### Remarks

https://www.postgresql.org/docs/current/static/indexes-collations.html