get max length of db column using entity framework, use that to truncate the value

GetMaxLength.cs

//using System;
//using System.Data.Entity.Core.Metadata.Edm;
//using System.Data.Entity.Infrastructure;
//using System.Linq;
//using System.Linq.Expressions;

public static int GetMaxLength<T>(Expression<Func<T, string>> column)
{
    int result = -1;
    var entType = typeof(T);
    var columnName = ((MemberExpression)column.Body).Member.Name;

    using (var objectContext = ((IObjectContextAdapter)new SieEntities()).ObjectContext)
    {
        var queryResult = objectContext.MetadataWorkspace.GetItems(DataSpace.CSpace)?
            .Where(m => m.BuiltInTypeKind == BuiltInTypeKind.EntityType)
            .SelectMany(meta => ((EntityType)meta).Properties
                .Where(p => p.Name == columnName && p.TypeUsage.EdmType.Name == "String")
            )
            .Where(p => p.DeclaringType.Name == entType.Name && p.TypeUsage.Facets["MaxLength"].Value.GetType().Name != "Unbounded")
            .Select(sel => sel.TypeUsage.Facets["MaxLength"].Value)
            .ToList();

        if (queryResult?.Any() ?? false)
        {
            result = Convert.ToInt32(queryResult.First());
        }
    }
    return result;
}

public static string Truncate<T>(Expression<Func<T, string>> column, string newValue)
{
    int max = GetMaxLength(column);
    if (max > -1 && !string.IsNullOrEmpty(newValue) && newValue.Length > max)
    {
        newValue = newValue.Substring(0, max);
    }

    return newValue;
}

// example: 
var news = new News()
{
    Title = SieExtensions.Truncate<News>(n => n.Title, item.Title),
    // max length of 128 or something
    Name = SieExtensions.Truncate<News>(n => n.Name, item.Name),
};
db.News.Add(news);
db.SaveChanges();