重写DataGridViewColumn代码以插入打开对话框的图片框

DataGridViewColumn是Windows Forms中的一个控件，用于显示和编辑数据表格。重写DataGridViewColumn代码以插入打开对话框的图片框，可以实现在DataGridView中插入一个可以打开对话框选择图片的图片框。

首先，需要创建一个自定义的DataGridViewColumn类，继承自DataGridViewColumn。在该类中，重写InitializeCell方法，以创建并初始化单元格的控件。

using System;
using System.Drawing;
using System.Windows.Forms;

public class OpenFileDialogColumn : DataGridViewColumn
{
    public OpenFileDialogColumn() : base(new OpenFileDialogCell())
    {
    }
}

public class OpenFileDialogCell : DataGridViewTextBoxCell
{
    protected override void InitializeEditingControl(int rowIndex, object initialFormattedValue, DataGridViewCellStyle dataGridViewCellStyle)
    {
        base.InitializeEditingControl(rowIndex, initialFormattedValue, dataGridViewCellStyle);

        var openFileDialog = new OpenFileDialog();
        openFileDialog.Filter = "Image Files (*.jpg, *.png, *.gif)|*.jpg;*.png;*.gif";

        var dataGridView = this.DataGridView;
        if (dataGridView != null)
        {
            var editingControl = dataGridView.EditingControl as OpenFileDialogEditingControl;
            if (editingControl != null)
            {
                editingControl.OpenFileDialog = openFileDialog;
            }
        }
    }

    public override Type EditType => typeof(OpenFileDialogEditingControl);
    public override Type ValueType => typeof(Image);
    public override object DefaultNewRowValue => null;
}

public class OpenFileDialogEditingControl : OpenFileDialog, IDataGridViewEditingControl
{
    private DataGridView dataGridView;
    private bool valueChanged = false;
    private int rowIndex;

    public OpenFileDialogEditingControl()
    {
        this.ShowReadOnly = true;
    }

    public object EditingControlFormattedValue
    {
        get { return this.FileName; }
        set { this.FileName = (string)value; }
    }

    public object GetEditingControlFormattedValue(DataGridViewDataErrorContexts context)
    {
        return this.FileName;
    }

    public void ApplyCellStyleToEditingControl(DataGridViewCellStyle dataGridViewCellStyle)
    {
        this.Font = dataGridViewCellStyle.Font;
        this.ForeColor = dataGridViewCellStyle.ForeColor;
        this.BackColor = dataGridViewCellStyle.BackColor;
    }

    public int EditingControlRowIndex
    {
        get { return rowIndex; }
        set { rowIndex = value; }
    }

    public bool EditingControlWantsInputKey(Keys keyData, bool dataGridViewWantsInputKey)
    {
        return !dataGridViewWantsInputKey;
    }

    public void PrepareEditingControlForEdit(bool selectAll)
    {
        // No preparation needed
    }

    public bool RepositionEditingControlOnValueChange
    {
        get { return false; }
    }

    public DataGridView EditingControlDataGridView
    {
        get { return dataGridView; }
        set { dataGridView = value; }
    }

    public bool EditingControlValueChanged
    {
        get { return valueChanged; }
        set { valueChanged = value; }
    }

    public Cursor EditingPanelCursor
    {
        get { return base.Cursor; }
    }

    protected override void OnValueChanged(EventArgs eventargs)
    {
        valueChanged = true;
        this.EditingControlDataGridView.NotifyCurrentCellDirty(true);
        base.OnValueChanged(eventargs);
    }
}

使用这个自定义的DataGridViewColumn类，可以在DataGridView中插入一个可以打开对话框选择图片的图片框。

var openFileDialogColumn = new OpenFileDialogColumn();
openFileDialogColumn.HeaderText = "Image";
openFileDialogColumn.Name = "imageColumn";

dataGridView.Columns.Add(openFileDialogColumn);

这样，当用户编辑该列时，会弹出一个文件选择对话框，选择的图片会显示在对应的单元格中。

这个自定义的DataGridViewColumn类可以应用于各种需要在DataGridView中插入图片的场景，例如商品列表中的商品图片、用户头像等。

腾讯云相关产品中，可以使用对象存储 COS 存储用户上传的图片文件，并通过 COS SDK 进行上传和下载操作。具体可以参考腾讯云对象存储 COS 的官方文档：https://cloud.tencent.com/document/product/436