ShrlAlgoToolkit/ShrlAlgo.Toolkit.Mvvm/Attributes/GreaterThanAttribute.cs

using System.ComponentModel.DataAnnotations;

namespace ShrlAlgo.Toolkit.Mvvm.Attributes;

[AttributeUsage(AttributeTargets.Property | AttributeTargets.Field | AttributeTargets.Parameter)]
public sealed class GreaterThanAttribute : ValidationAttribute
{
	public GreaterThanAttribute(string propertyName)
	{
		PropertyName = propertyName;
	}

	public string PropertyName { get; }

	protected override ValidationResult IsValid(object value, ValidationContext validationContext)
	{
		object instance = validationContext.ObjectInstance,
			otherValue = instance.GetType().GetProperty(PropertyName).GetValue(instance);

		return ((IComparable)value).CompareTo(otherValue) > 0 ? ValidationResult.Success : new($"当前值小于{value}");
	}
}