EntityTypeBuilder<TEntity>.HasAlternateKey Method
Definition
Important
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Overloads
HasAlternateKey(Expression<Func<TEntity,Object>>) |
Creates an alternate key in the model for this entity type if one does not already exist over the specified properties. This will force the properties to be read-only. Use HasIndex(String[]) or HasIndex(Expression<Func<TEntity,Object>>) to specify uniqueness in the model that does not force properties to be read-only. |
HasAlternateKey(String[]) |
Creates an alternate key in the model for this entity type if one does not already exist over the specified properties. This will force the properties to be read-only. Use HasIndex(String[]) or HasIndex(Expression<Func<TEntity,Object>>) to specify uniqueness in the model that does not force properties to be read-only. |
HasAlternateKey(Expression<Func<TEntity,Object>>)
Creates an alternate key in the model for this entity type if one does not already exist over the specified properties. This will force the properties to be read-only. Use HasIndex(String[]) or HasIndex(Expression<Func<TEntity,Object>>) to specify uniqueness in the model that does not force properties to be read-only.
public virtual Microsoft.EntityFrameworkCore.Metadata.Builders.KeyBuilder HasAlternateKey (System.Linq.Expressions.Expression<Func<TEntity,object>> keyExpression);
public virtual Microsoft.EntityFrameworkCore.Metadata.Builders.KeyBuilder<TEntity> HasAlternateKey (System.Linq.Expressions.Expression<Func<TEntity,object>> keyExpression);
public virtual Microsoft.EntityFrameworkCore.Metadata.Builders.KeyBuilder<TEntity> HasAlternateKey (System.Linq.Expressions.Expression<Func<TEntity,object?>> keyExpression);
override this.HasAlternateKey : System.Linq.Expressions.Expression<Func<'Entity, obj>> -> Microsoft.EntityFrameworkCore.Metadata.Builders.KeyBuilder
override this.HasAlternateKey : System.Linq.Expressions.Expression<Func<'Entity, obj>> -> Microsoft.EntityFrameworkCore.Metadata.Builders.KeyBuilder<'Entity (requires 'Entity : null)>
Public Overridable Function HasAlternateKey (keyExpression As Expression(Of Func(Of TEntity, Object))) As KeyBuilder
Public Overridable Function HasAlternateKey (keyExpression As Expression(Of Func(Of TEntity, Object))) As KeyBuilder(Of TEntity)
Parameters
- keyExpression
- Expression<Func<TEntity,Object>>
A lambda expression representing the key property(s) (blog => blog.Url
).
If the key is made up of multiple properties then specify an anonymous type including
the properties (post => new { post.Title, post.BlogId }
).
Returns
An object that can be used to configure the key.
Applies to
HasAlternateKey(String[])
Creates an alternate key in the model for this entity type if one does not already exist over the specified properties. This will force the properties to be read-only. Use HasIndex(String[]) or HasIndex(Expression<Func<TEntity,Object>>) to specify uniqueness in the model that does not force properties to be read-only.
public virtual Microsoft.EntityFrameworkCore.Metadata.Builders.KeyBuilder<TEntity> HasAlternateKey (params string[] propertyNames);
override this.HasAlternateKey : string[] -> Microsoft.EntityFrameworkCore.Metadata.Builders.KeyBuilder<'Entity (requires 'Entity : null)>
Public Overridable Function HasAlternateKey (ParamArray propertyNames As String()) As KeyBuilder(Of TEntity)
Parameters
- propertyNames
- String[]
The names of the properties that make up the key.
Returns
An object that can be used to configure the key.
Applies to
Entity Framework