在上篇文章(地址: C# 设计时动态改变实体在PropertyGrid中显示出来的属性)中可以看到:
自定义属性的显示是有问题的,那么如何修改呢?
代码如下:
public class PropertyDisplayConverterr<T> : 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); } }接口:
public interface IDisplay { /// <summary> /// 得到显示字符串 /// </summary> /// <returns></returns> string GetDisplayString(); }修改上文中实体类如下:
[TypeConverterAttribute(typeof(PropertyDisplayConverterr<IdentityColumnEntity>))] public class IdentityColumnEntity : IDisplay { private bool isIncrementColumn; /// <summary> /// 是否是自增列 /// </summary> [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; /// <summary> /// 标识增量 /// </summary> [Browsable(true)] [Category("基本")] [DisplayName("标识增量")] [ReadOnly(false)] [Description("标识增量属性指定在 Microsoft SQL Server 为插入的行生成标识值时,在现有的最大行标识值基础上所加的值。标识增量必须是 非零 整数,位数等于或小于 10。")] public Int64 IdentityIncrement { set { identityIncrement = value; } get { return identityIncrement; } } private Int64 ident_Seed; /// <summary> /// 标识种子 /// </summary> [Browsable(true)] [Category("基本")] [DisplayName("标识种子")] [ReadOnly(false)] [Description("指示标识列的初始行值。标识种子必须是 整数,位数等于或小于 10。")] public Int64 Ident_Seed { set { ident_Seed = value; } get { return ident_Seed; } } public string GetDisplayString() { if (this == null || this.IdentityIncrement == 0) { return "未设置自增列信息"; } return String.Format("标识种子:{0};标识增量:{1}", this.Ident_Seed, this.IdentityIncrement); } }效果如下:
演示代码:点击打开链接
本文参考:Customized display of collection data in a PropertyGrid
参考文章中demo:点击打开链接
拓展: