CODEWITHSUNDEEP
c#sql-server-2005
mcUser
mcUser

Reputation: 753

What is the equivalent datatype of SQL Server's Numeric in C#

In SQL Server we can write data AS Numeric(15,10) .. what will the equivalent of this in C#?

I know that Numeric's equivalent is Decimal but how to represent Numeric(15,10)?

Upvotes: 56

Views: 94230

Answers (4)

mahdi yousefi
mahdi yousefi

Reputation: 905

if you are using EntityFrameWorkCore there is a solution for this. after defining DbContext in your project you can add configuration for the model as below:

public class ChequeEfConfiguration : IEntityTypeConfiguration<Cheque>
{
    public void Configure(EntityTypeBuilder<Cheque> builder)
    {
        builder.Property(a => a.Amount).HasColumnType("decimal(18,2)");                 
    }
}

or you can use OnModelCreating in your DbContext like this:

protected override void OnModelCreating(ModelBuilder modelBuilder)
{
     base.OnModelCreating(modelBuilder);
     modelBuilder.Entity<Cheque>().Property(x => x.Amount)
          .IsRequired().HasColumnType("decimal(18,2)");
}

but I would recommend you to use the first one. for more information visit https://learn.microsoft.com/en-us/ef/core/modeling/

Upvotes: 0

Gerard ONeill
Gerard ONeill

Reputation: 4092

There are two answers depending on two questions:

1) What is something that allows you to specify the precision and scale. Nothing. This seems like your question, but just in case:

2) What is something that allows you to specify a decimal floating point number exactly. This is indeed the Decimal type -- but the point is internal and is set to one of 2^32 positions based on the input number. Not sure why, but only 28 values work, or 2^5 - 4..

So even though .Net allows the Decimal to look like a float, it is very different under the covers and does match the Decimal of SQLServer. Anything not a sum of distinct power of 2 values is an estimation using the normal binary floating point. This means even something such as the number 0.1, has already lost precision. But not with the Decimal type.

Upvotes: 1

Jon Skeet
Jon Skeet

Reputation: 1500065

There isn't a direct equivalent, in that there are no built-in .NET types which allow you to specify the precision/scale explicitly as far as I'm aware. There's no fixed-point type like NUMERIC.

decimal and double are the common floating point types in .NET, with decimal implementing decimal floating point (like NUMERIC in T-SQL) and double implementing binary floating point behaviour (like FLOAT and REAL in T-SQL). (There's float as well, which is a smaller binary floating point type.)

You should choose between decimal and double based on what values you're going to represent - I typically think of "man-made", artificial values (particularly money) as being appropriate for decimal, and continuous, natural values (such as physical dimensions) as being appropriate for double.

Upvotes: 80

Icemanind
Icemanind

Reputation: 48686

Try looking at this site as a guide to the data type mappings. As far as the precision and length, you control that yourself using format specifiers

Upvotes: 15

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