In EF Core, you can use the fluent API to set a constant value for all columns that have a specific name in a database table. You can achieve this by using the HasDefaultValue
method in the PropertyBuilder
class.
Here's an example of how you can set a constant value for all columns named "CreatedBy" in a Blog
entity:
public class Blog
{
public int Id { get; set; }
public string Title { get; set; }
public string Content { get; set; }
public string CreatedBy { get; set; }
public DateTime CreatedDate { get; set; }
}
public class BlogContext : DbContext
{
public DbSet<Blog> Blogs { get; set; }
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
modelBuilder.Entity<Blog>()
.Property(b => b.CreatedBy)
.HasDefaultValue("John Doe");
}
}
In the example above, the HasDefaultValue
method sets the default value for the CreatedBy
column to "John Doe". This means that whenever a new Blog
entity is created, the CreatedBy
property will be automatically set to "John Doe" unless it is explicitly set to a different value.
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Asked: 2022-05-17 11:00:00 +0000
Seen: 8 times
Last updated: Nov 15 '22
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