Xamarin forms visual studio for Mac clean命名空间问题

我使用.net标准创建了一个Xamarin表单应用程序。然后,我向解决方案中添加了一个.net标准库项目,该项目将包含常见代码,如呈现、行为等。我通过右键单击“依赖项和编辑引用”菜单,将公共.net标准库项目引用到主Xamarin窗体项目。最后,通过指定下面的行,我尝试在Xamarin主表单的内容页中包含呈现器文件的名称空间

namespace MyProject.Shared.Renderer
{
    public class ExtendedEntry : Entry
    {
        public static readonly BindableProperty IsBorderErrorVisibleProperty = BindableProperty.Create(nameof(IsBorderErrorVisible), typeof(bool), typeof(ExtendedEntry),
            false, BindingMode.TwoWay);

        public bool IsBorderErrorVisible
        {
            get { return (bool)GetValue(IsBorderErrorVisibleProperty); }
            set { SetValue(IsBorderErrorVisibleProperty, value); }
        }

        public static readonly BindableProperty BorderErrorColorProperty = BindableProperty.Create(nameof(BorderErrorColor), typeof(Color), typeof(ExtendedEntry),
            null, BindingMode.TwoWay);

        public Color BorderErrorColor
        {
            get { return (Color)GetValue(BorderErrorColorProperty); }
            set { SetValue(BorderErrorColorProperty, value); }
        }

        public static readonly BindableProperty ErrorTextProperty = BindableProperty.Create(nameof(ErrorText), typeof(string), typeof(ExtendedEntry), string.Empty,
            BindingMode.TwoWay);

        public string ErrorText
        {
            get { return (string)GetValue(ErrorTextProperty); }
            set { SetValue(ErrorTextProperty, value); }
        }
    }
}
xmlns:controls=“clr-namespace:MyProject.Shared.Renderer:assembly:MyProject.Shared”

Then I reference the control as
<controls:ExtendedEntry />

但这会导致生成错误,即在程序集MyProject.Shared中找不到ExtendedEntry

请帮忙