c# - 在 propertygrid 中将属性更改为组合框

Question

我从 Internet 源获得这段代码，我认为这段代码可能适用于将 PropertyGrid 中的属性从文本框更改为组合框，但在我运行它之后，它仍然是一个文本框。谁能帮忙解决这个问题？

 public class Testing
{   

    private String _formatString;
    [Category("Display")]
    [DisplayName("Format String")]
    [Description("Format string governing display of data values.")]
    [DefaultValue("")]
    [TypeConverter(typeof(FormatStringConverter))]
    public String FormatString { get; set; }

    public class FormatStringConverter : StringConverter
    {
        List<String> list = new List<String>();

        public override bool GetStandardValuesSupported(ITypeDescriptorContext context) { return true; } // true means show combobox
        public override bool GetStandardValuesExclusive(ITypeDescriptorContext context) { return true; } // true list to list, false will show the list, but allow free=form.
        public override StandardValuesCollection GetStandardValues(ITypeDescriptorContext context)
        {

            list.Add("Curren");
            list.Add("Currency");
            list.Add("Scientific Notation");
            list.Add("General Number");
            list.Add("Number");
            list.Add("Percent");
            list.Add("Time");
            list.Add("Date");



            return new StandardValuesCollection(list);
        }
    }
}

Answer 1

如果我们需要显示从 TextBox 到 ComboBox 的属性值，我们想为特定的属性类型编写自定义编辑器。请找到以下代码片段以在 ComboBox 中显示属性值(字符串数组类型)

     public class ComboBoxEditor : ITypeEditor
    {
        public void Attach(PropertyViewItem property, PropertyItem info)
        {

        }

        ComboBoxAdv cmb;
        public object Create(PropertyInfo propertyInfo)
        {
            cmb = new ComboBoxAdv();
            cmb.Items.Add("Curren");
            cmb.Items.Add("Currency");
            cmb.Items.Add("Scientific Notation");
            cmb.Items.Add("General Number");
            cmb.Items.Add("Number");
            cmb.Items.Add("Percent");
            cmb.Items.Add("Time");
            cmb.Items.Add("Date");
            return cmb;
        }

        public void Detach(PropertyViewItem property)
        {
            throw new NotImplementedException();
        }

}

CustomEditor ComboBoxEditor = new CustomEditor() { HasPropertyType = true, PropertyType = typeof(string[]) };
        ComboBoxEditor.Editor = new ComboBoxPropertyGridSample.ComboBoxEditor();

我还附上了这个简单的示例

http://www.syncfusion.com/downloads/support/directtrac/general/ze/ComboBoxPropertyGridSample1192877556