UrlAttribute.cs

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namespace System.ComponentModel.DataAnnotations;
 
[AttributeUsage(AttributeTargets.Property | AttributeTargets.Field | AttributeTargets.Parameter, AllowMultiple = false)]
public sealed class UrlAttribute : DataTypeAttribute
{
    public UrlAttribute()
        : base(DataType.Url)
    {
        base.DefaultErrorMessage = System.SR.UrlAttribute_Invalid;
    }
 
    public override bool IsValid(object? value)
    {
        if (value == null)
        {
            return true;
        }
        if (value is string text)
        {
            if (!text.StartsWith("http://", StringComparison.OrdinalIgnoreCase) && !text.StartsWith("https://", StringComparison.OrdinalIgnoreCase))
            {
                return text.StartsWith("ftp://", StringComparison.OrdinalIgnoreCase);
            }
            return true;
        }
        return false;
    }
}