c＃propertygrid从uint转换为字符串

Question

我无法将uint的显示属性转换为string格式的PropertyGrid控件。这是我做的：

var fruits = new SortedDictionary<uint, string> 
{ 
    {0, "Apple"}, 
    {1, "Orange"}, 
    {3, "Watermelon"}, 
}; 

public class FruitConverter : StringConverter 
{ 
    public override bool CanConvertFrom(ITypeDescriptorContext context, 
             Type sourceType) 
    { 
     if (sourceType == typeof(uint) && fruits.ContainsKey(sourceType)) 
     return true; 

     return base.CanConvertFrom(context, sourceType); 
    } 

    public override object ConvertFrom(ITypeDescriptorContext context, 
            CultureInfo culture, 
            object value) 
    { 
     if (sourceType == typeof(uint) && fruits.ContainsKey(sourceType)) 
      return fruits[value]; 

     return base.ConvertFrom(context, culture, value); 
    } 
} 

public class Fruit 
{ 
    [ReadOnly(true)] 
    [DisplayName("Type of fruit")] 
    [TypeConverter(typeof(FruitConverter))] 
    public uint FruitTypeCode { get; set; } 
} 

但财产FruitTypeCode仍显示为uint而不是作为一个string，我做错了什么？

Answer 1

这应该工作：

public class FruitConverter : TypeConverter 
{ 
    public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType) 
    { 
     return fruits[(uint)value]; 
    } 
}