DisplayFormatAttribute.cs

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using System.Diagnostics.CodeAnalysis;
 
namespace System.ComponentModel.DataAnnotations;
 
[AttributeUsage(AttributeTargets.Property | AttributeTargets.Field, AllowMultiple = false)]
public class DisplayFormatAttribute : Attribute
{
    private readonly LocalizableString _nullDisplayText = new LocalizableString("NullDisplayText");
 
    public string? DataFormatString { get; set; }
 
    public string? NullDisplayText
    {
        get
        {
            return _nullDisplayText.Value;
        }
        set
        {
            _nullDisplayText.Value = value;
        }
    }
 
    public bool ConvertEmptyStringToNull { get; set; }
 
    public bool ApplyFormatInEditMode { get; set; }
 
    public bool HtmlEncode { get; set; }
 
    [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicProperties)]
    public Type? NullDisplayTextResourceType
    {
        get
        {
            return _nullDisplayText.ResourceType;
        }
        set
        {
            _nullDisplayText.ResourceType = value;
        }
    }
 
    public DisplayFormatAttribute()
    {
        ConvertEmptyStringToNull = true;
        HtmlEncode = true;
    }
 
    public string? GetNullDisplayText()
    {
        return _nullDisplayText.GetLocalizableValue();
    }
}