C# PropertyGrid显示文本框内联，而不是下拉

几乎完全符合我的需要，但我不想使用下拉列表，而是希望编辑在网格中进行

UITypeEditorEditStyle

似乎没有多大帮助，因为将其设置为“无”将完全消除文本框控件

或者，有没有更简单的方法来访问控件用来钩住事件的文本框

---

最后，我正在寻找一个文本输入小部件，它将输入的长度限制为1。内联完成，和2。不必等到用户停止键入时才给他们一个错误或截断输入。

您可以使用一个类型转换器，一旦输入文本，它将限制文本。只有文本框失去焦点，这才有效。假设我有一个要使用属性网格编辑的类：

public class MyClass
{
    [TypeConverter(typeof(MyTypeConverter))]
    public string MyText { get; set; }
}

以下是执行此操作的类型转换器代码：

public class MyTypeConverter : TypeConverter
{
    public const int MaxLength = 10;

    public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType)
    {
        return sourceType == typeof(string);
    }

    public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType)
    {
        return destinationType == typeof(string);
    }

    public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value)
    {
        return Truncate(value as string, MaxLength);
    }

    public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType)
    {
        return Truncate(value as string, MaxLength);
    }

    private static string Truncate(string value, int maxLength)
    {
        if (value == null)
            return null;

        return value.Length <= maxLength ? value : value.Substring(0, maxLength);
    }
}

请注意，MyText属性由一个“标记”编辑器装饰，该编辑器什么也不做：

public class NoneEditor : UITypeEditor
{
    public override UITypeEditorEditStyle GetEditStyle(ITypeDescriptorContext context)
    {
        return UITypeEditorEditStyle.None;
    }
}

我可以挂上网格，就像这样：

propertyGrid1.SelectedGridItemChanged += OnPropertyGridSelectedGridItemChanged;

    public static void OnPropertyGridSelectedGridItemChanged(object sender, SelectedGridItemChangedEventArgs e)
    {
        PropertyGrid pg = (PropertyGrid)sender;
        GridItem item = e.NewSelection;

        // yes, a grid item is also an IServiceProvider
        IServiceProvider sp = (IServiceProvider)item;

        // get the property grid view control
        IWindowsFormsEditorService svc = (IWindowsFormsEditorService)sp.GetService(typeof(IWindowsFormsEditorService));

        // WARNING: hack time! this uses private members, so use at your own risks...
        TextBox edit = (TextBox)svc.GetType().GetProperty("Edit", BindingFlags.Instance | BindingFlags.NonPublic).GetValue(svc, null);

        // is this our funky stuff?
        if (item.PropertyDescriptor.GetEditor(typeof(UITypeEditor)) is NoneEditor)
        {
            edit.MaxLength = 10;
            edit.BackColor = Color.Blue;
        }
        else // don't forget to reset the edit box here
        {
            edit.MaxLength = int.MaxValue;
            edit.BackColor = Color.White;
        }
    }

---

PropertyGrid是福特T型用户界面设计：“客户可以选择任何颜色，只要是黑色”。至少有3个选项，文本框是默认值，组合框或自定义编辑器的对话框。输入验证需要在类型转换器中进行。最后，我将钩子的一个变体改为

SelectedGridItemChanged

，效果非常好。我一直在尝试子类化

属性Grid

。。。最终还是陷入了这样的境地。谢谢

propertyGrid1.SelectedGridItemChanged += OnPropertyGridSelectedGridItemChanged;

    public static void OnPropertyGridSelectedGridItemChanged(object sender, SelectedGridItemChangedEventArgs e)
    {
        PropertyGrid pg = (PropertyGrid)sender;
        GridItem item = e.NewSelection;

        // yes, a grid item is also an IServiceProvider
        IServiceProvider sp = (IServiceProvider)item;

        // get the property grid view control
        IWindowsFormsEditorService svc = (IWindowsFormsEditorService)sp.GetService(typeof(IWindowsFormsEditorService));

        // WARNING: hack time! this uses private members, so use at your own risks...
        TextBox edit = (TextBox)svc.GetType().GetProperty("Edit", BindingFlags.Instance | BindingFlags.NonPublic).GetValue(svc, null);

        // is this our funky stuff?
        if (item.PropertyDescriptor.GetEditor(typeof(UITypeEditor)) is NoneEditor)
        {
            edit.MaxLength = 10;
            edit.BackColor = Color.Blue;
        }
        else // don't forget to reset the edit box here
        {
            edit.MaxLength = int.MaxValue;
            edit.BackColor = Color.White;
        }
    }