Question

我有两个用户控件，一个是简单的图片持有者，里面有一个复选框。另一个用作容器而不是前一个控件的集合。

所以 HorizontalPictureScroller 可以有很多 SelectablePicture 控件。我会粘贴每个控件的小代码：

首先， HorizontalPictureScroller ：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Collections.ObjectModel;

namespace WinformsPlayground
{
    [Serializable()]
    public partial class HorizontalPictureScroller : UserControl
    {
        public HorizontalPictureScroller()
        {
            InitializeComponent();
            Pictures = new ObservableCollection<SelectablePicture>();
            Pictures.CollectionChanged += new System.Collections.Specialized.NotifyCollectionChangedEventHandler(Pictures_CollectionChanged);
        }       

        #region "Properties"
        public ObservableCollection<SelectablePicture> Pictures { get; set; }
        private int PositionControlX = 0;
        #endregion

        #region "Methods"
        private void RedrawPictures()
        {
            PositionControlX = 0;

            foreach (var picture in Pictures)
            {
                picture.Location = new Point(PositionControlX + panelPicturesWrapper.AutoScrollPosition.X, 0);
                PositionControlX += 130;
                panelPicturesWrapper.Controls.Add(picture);
            }
        }

        public void AddPicture(SelectablePicture picture)
        {
            Pictures.Add(picture);
        }

        public void RemovePicture(SelectablePicture picture)
        {
            Pictures.Remove(picture);
        }

        public void MovePictureLeft(int index)
        {
            SelectablePicture tmpPicture = Pictures[index];
            Pictures[index] = Pictures[index - 1];
            Pictures[index - 1] = tmpPicture;
        }

        public void MovePictureRight(int index)
        {
            SelectablePicture tmpPicture = Pictures[index];
            Pictures[index] = Pictures[index + 1];
            Pictures[index + 1] = tmpPicture;
        }
        #endregion

        #region "Events"
        void Pictures_CollectionChanged(object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e)
        {
            RedrawPictures();
        }        
        #endregion
    }
}

现在， SelectablePicture 控件：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace WinformsPlayground
{
    [Serializable()]
    public partial class SelectablePicture : UserControl
    {
        public SelectablePicture()
        {
            InitializeComponent();
            panel1.BackgroundImageLayout = ImageLayout.Zoom;
        }

        public SelectablePicture(Image image)
        {
            panel1.BackgroundImage = image;
            panel1.BackgroundImageLayout = ImageLayout.Zoom;
        }

        #region "Properties"
        public Image Image()
        {
            return panel1.BackgroundImage;
        }

        public bool IsSelected()
        {
            return chkSelected.Checked;
        }
        #endregion

        #region "Methods"
        public void ToggleCheckBox()
        {
            chkSelected.Checked = chkSelected.Checked ? false : true;
        }

        public void VisuallySelect()
        {
            this.BackColor = Color.FromArgb(51, 153, 255);
        }

        public void VisuallyDeselect()
        {
            //If none of the controls inside the usercontrol have focus, set this control to white.
            if (!this.Focused && !this.panel1.Focused && !this.chkSelected.Focused)
            {
                this.BackColor = Color.White;
            }
        }        
        #endregion

        #region "Events"
        private void panel1_Click(object sender, EventArgs e)
        {
            VisuallySelect();
            ToggleCheckBox();
            panel1.Focus();
        }

        private void chkSelected_Click(object sender, EventArgs e)
        {
            VisuallySelect();
            ToggleCheckBox();
            chkSelected.Focus();
        }

        private void SelectablePicture_Click(object sender, EventArgs e)
        {
            VisuallySelect();
            ToggleCheckBox();
            this.Focus();
        }

        private void panel1_Leave(object sender, EventArgs e)
        {
            VisuallyDeselect();
        }

        private void chkSelected_Leave(object sender, EventArgs e)
        {
            VisuallyDeselect();
        }

        private void SelectablePicture_Leave(object sender, EventArgs e)
        {
            VisuallyDeselect();
        }
        #endregion        
    }
}

这是我在尝试将HorizontalPictureScroller拖到我的Winform设计视图时得到的错误的屏幕截图（抱歉，我无法在此处粘贴文本）： alt text

我的用户控件非常简单，我无法看到代码中出现了什么问题。

也许这对我来说是一个明显的错误。：P非常感谢你的时间。

Answer 1

由于您使用的是SerializableAttribute，但正在抛出异常，但UserControl没有。

来自SerializableAttribute的文档：

如果要序列化的对象图中的任何类型没有应用SerializableAttribute属性，则公共语言运行库会抛出SerializationException。

Answer 2

似乎UserControl SelectablePicture需要序列化，因为它在Collection中使用。所以你在attribut [Serializable（）]的解决方案附近。但是你最好在UserControl SelectablePicture中实现ISerializable接口

public partial class SelectablePicture : UserControl, ISerializable
{
    #region ISerializable Membres

    public void GetObjectData(SerializationInfo info, StreamingContext context)
    {
        ...
    }

    #endregion
}

这是解决问题的第一步。这样，拖放UserControl时就不会出现错误消息。但现在你必须管理序列化。

如果有人知道为什么需要序列化，我很感兴趣。

将用户控件拖到设计视图上时，Visual Studio会触发错误

2 个答案: