Orchard CMS中设置string字段为nvarchar(

Orchard中设置字段为nvarchar(max)，为了避免4000个字符的限制，需要在DB和NHibernate上都添加设置

1. 在Model中将列定义为无限制。确保数据库中的列是nvarchar (max)或varchar (max)

在migration.cs文件中为属性添加Unlimited()

// Creating table KeynoteInformationRecord
SchemaBuilder.CreateTable("KeynoteInformationRecord", table => table
    .Column("Id", DbType.Int32, column => column.PrimaryKey().Identity())
    .Column("KeynotePartId", DbType.Int32)
    .Column("Title", DbType.String, column => column.Unlimited())
    .Column("Description", DbType.String, column => column.Unlimited())
    .Column("StartDate", DbType.DateTime)
    .Column("EndDate", DbType.DateTime)
    .Column("HasEvaluation", DbType.Boolean)
    .Column("IsDeleted", DbType.Boolean)
);

2. 在Nhibernate端，为了确保字符串不被截断，您必须在模型类中的字符串属性中添加[ StringLengthMax ]属性，需要引用 Orchard.Data.Conventions

   public class KeynoteInformationRecord
   {
       public virtual int Id { get; set; }
       public virtual int KeynotePartId { get; set; }
       [StringLengthMax]
       public virtual string Title { get; set; }
       [StringLengthMax]
       public virtual string Description { get; set; }
       public virtual DateTime StartDate { get; set; }
       public virtual DateTime EndDate { get; set; }
       public virtual bool HasEvaluation { get; set; }
       public virtual bool IsDeleted { get; set; }
   }