C# 自定義屬性在propertyGrid控件中顯示

C# 自定義屬性在propertyGrid控件中顯示

在上篇文章（地址： C# 設計時動態改變實體在PropertyGrid中顯示出來的屬性）中可以看到：

自定義屬性的顯示是有問題的，那麼如何修改呢？

代碼如下：

public class PropertyDisplayConverterr : ExpandableObjectConverter where T : IDisplay
    {
        public override bool CanConvertTo(ITypeDescriptorContext context, System.Type destinationType)
        {
            if (destinationType == typeof(T))
                return true;
            return base.CanConvertTo(context, destinationType);
        }
        // This is a special type converter which will be associated with the T class.
        // It converts an T object to string representation for use in a property grid.
        public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, System.Type destinationType)
        {
            if (destinationType == typeof(System.String) && value is T)
            {
                return ((IDisplay)value).GetDisplayString();
            }
            return base.ConvertTo(context, culture, value, destinationType);
        }
    }

 public interface IDisplay
    {
        /// 

        /// 得到顯示字符串
        /// 
        /// 
        string GetDisplayString();
    }

 [TypeConverterAttribute(typeof(PropertyDisplayConverterr))]
    public class IdentityColumnEntity : IDisplay
    {
        private bool isIncrementColumn;
        /// 

        /// 是否是自增列
        /// 
        [Browsable(true)]
        [Category(基本)]
        [DisplayName(是否是自增列)]
        [ReadOnly(false)]
        [DefaultValue(false)]
        public bool IsIncrementColumn
        {
            set { isIncrementColumn = value; }
            get { return isIncrementColumn; }
        }

        private Int64 identityIncrement;
        /// 

        /// 標識增量
        /// 
        [Browsable(true)]
        [Category(基本)]
        [DisplayName(標識增量)]
        [ReadOnly(false)]
        [Description(標識增量屬性指定在 Microsoft SQL Server 為插入的行生成標識值時，在現有的最大行標識值基礎上所加的值。標識增量必須是 非零 整數，位數等於或小於 10。)]
        public Int64 IdentityIncrement
        {
            set { identityIncrement = value; }
            get { return identityIncrement; }
        }

        private Int64 ident_Seed;
        /// 

        /// 標識種子 
        /// 
        [Browsable(true)]
        [Category(基本)]
        [DisplayName(標識種子)]
        [ReadOnly(false)]
        [Description(指示標識列的初始行值。標識種子必須是  整數，位數等於或小於 10。)]
        public Int64 Ident_Seed
        {
            set { ident_Seed = value; }
            get { return ident_Seed; }
        }

        public string GetDisplayString()
        {
            if (this == null || this.IdentityIncrement == 0)
            {
                return 未設置自增列信息;
            }
            return String.Format(標識種子:{0};標識增量:{1}, this.Ident_Seed, this.IdentityIncrement);
        }
    }