如何在DataGridViewComboboxColumn中禁用一个嵌套属性的ComboBox?

时间:2017-11-10 12:55:08

标签: c# winforms datagridview

我在dataGridView中显示对象列表。该列表如下:

List<IAction> actions = new List<IAction>

我在DataGridViewComboBoxColumn()上使用 karlipoppins 回答显示嵌套属性(未在IAction界面中定义)(反射)Is it possible to bind complex type properties to a datagrid?

但是如果在一种对象中没有Area属性的情况下禁用组合框我有问题

希望你能帮助我;)

在列表中有两种类型的对象:

public class MoveAction : IAction
    {
        public string Name { get; set; }
        public bool Active { get; set; } = true;
     }

public class ClickAction : IAction
    {
        public string Name { get; set; }
        public bool Active { get; set; } = true;
        public Area Area { get; set; }  //////////  Additional Property
    }

此附加属性对象如下所示:

public class Area
{
    public string Name { get; set; }
    ...
}

dataGridView列定义如下:

    DataGridViewComboBoxColumn CreateComboBoxWithArea()
    {
        DataGridViewComboBoxColumn combo = new DataGridViewComboBoxColumn();
        combo.DataSource = areas.Select(t => t.Name).ToArray();
        combo.DataPropertyName = "Area.Name";
        combo.Name = "Area";
        return combo;
    }

2 个答案:

答案 0 :(得分:0)

您可以绑定到单元格的BeginEdit事件,并在此时取消编辑组合。像:

dataGrid.CellBeginEdit += dataGrid_CellBeginEdit;

void dgSamples_CellBeginEdit(object sender, GridViewCellCancelEventArgs e)
{
    var areaObject = e.Row.Cells["Area"].Value AS Area; // .Value will be the current selected item in the cell's combo.
    if (areaObject.Area == null)
    {
         e.Cancel = true;
    }
}

这不会显示组合已被禁用&#39;但它会阻止用户降低组合并更改值。基本上使单元格只读。

最后,当您为组合框定义数据源时,我不确定您的areas列表对象的类型。因此,当我将.Value属性转换为Areas时,我猜测了这种类型。您可能需要更改它。

答案 1 :(得分:0)

我找到了自己的解决方案:

在投射发件人后,我可以访问整个网格。之后,我可以用这个组合框做我想做的事情(隐藏按钮,设置只读...)。这是因为组合框没有属性bool Enable; /

感谢jaredbaszler的帮助!

private void dataGridView1_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
        {
            DataGridView grid = (DataGridView)sender;
            DataGridViewRow row = grid.Rows[e.RowIndex];
            DataGridViewColumn col = grid.Columns[e.ColumnIndex];
            if (row.DataBoundItem != null && col.DataPropertyName.Contains("."))
            {
                string[] props = col.DataPropertyName.Split('.');
                PropertyInfo propInfo = row.DataBoundItem.GetType().GetProperty(props[0]);
                if(propInfo != null)
                {
                    object val = propInfo.GetValue(row.DataBoundItem, null);
                    for (int i = 1; i < props.Length; i++)
                    {
                        propInfo = val.GetType().GetProperty(props[i]);
                        val = propInfo.GetValue(val, null);
                    }
                    e.Value = val;
                }
                else
                {
                    DataGridViewCell cell = grid.Rows[e.RowIndex].Cells[e.ColumnIndex];
                    DataGridViewComboBoxCell chkCell = cell as DataGridViewComboBoxCell;
                    chkCell.DisplayStyle = DataGridViewComboBoxDisplayStyle.Nothing;
                    cell.ReadOnly = true;
                }
            }
        }