DataObjectFieldAttribute.cs

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using System.Diagnostics.CodeAnalysis;
 
namespace System.ComponentModel;
 
[AttributeUsage(AttributeTargets.Property)]
public sealed class DataObjectFieldAttribute : Attribute
{
    public bool IsIdentity { get; }
 
    public bool IsNullable { get; }
 
    public int Length { get; }
 
    public bool PrimaryKey { get; }
 
    public DataObjectFieldAttribute(bool primaryKey)
        : this(primaryKey, isIdentity: false, isNullable: false, -1)
    {
    }
 
    public DataObjectFieldAttribute(bool primaryKey, bool isIdentity)
        : this(primaryKey, isIdentity, isNullable: false, -1)
    {
    }
 
    public DataObjectFieldAttribute(bool primaryKey, bool isIdentity, bool isNullable)
        : this(primaryKey, isIdentity, isNullable, -1)
    {
    }
 
    public DataObjectFieldAttribute(bool primaryKey, bool isIdentity, bool isNullable, int length)
    {
        PrimaryKey = primaryKey;
        IsIdentity = isIdentity;
        IsNullable = isNullable;
        Length = length;
    }
 
    public override bool Equals([NotNullWhen(true)] object? obj)
    {
        if (obj == this)
        {
            return true;
        }
        if (obj is DataObjectFieldAttribute dataObjectFieldAttribute && dataObjectFieldAttribute.IsIdentity == IsIdentity && dataObjectFieldAttribute.IsNullable == IsNullable && dataObjectFieldAttribute.Length == Length)
        {
            return dataObjectFieldAttribute.PrimaryKey == PrimaryKey;
        }
        return false;
    }
 
    public override int GetHashCode()
    {
        return base.GetHashCode();
    }
}