winforms DataGridViewComboBoxColumn，设置 DataPropertyName 时 ComboBox 不可点击

Posted 2023-05-08

【中文标题】winforms DataGridViewComboBoxColumn，设置 DataPropertyName 时 ComboBox 不可点击

【英文标题】：winforms DataGridViewComboBoxColumn, ComboBox not clickable when DataPropertyName is set

【发布时间】：2016-05-16 12:31:47

【问题描述】：

我有 DataGridView 和 DataGridViewComboBoxColumn 和数据源绑定，当我绑定 DataGridView 的 DataPropertyName 时，ComboBox 变得不可点击。

dgFMS.ReadOnly = false;

正确的 DataPropertyName 与每一行绑定，但我无法从下拉列表中选择

BindingSource _bsCats2 = new BindingSource();
DataGridViewComboBoxColumn catCol = new DataGridViewComboBoxColumn();
_bsCats2.DataSource = CategoryManager.Categories.Select(x => new  
    Key = x.ParentWithName.ToLowerInvariant(), 
    Value = x.Id )
    .ToList();
catCol.DataSource = _bsCats2;
catCol.DataPropertyName = "catID";
catCol.DisplayMember = "Key";
catCol.ValueMember = "Value";
catCol.Width = 250;
catCol.ReadOnly = false;
dgFMS.Columns.Add(catCol);
dgFMS.ReadOnly = false;

我也在实现 dgFMS_EditingControlShowing

private void dgFMS_EditingControlShowing(object sender, 
    DataGridViewEditingControlShowingEventArgs e)

    ComboBox cb = e.Control as ComboBox;
    if (cb != null)
    
        cb.DropDownStyle = ComboBoxStyle.DropDown;
        cb.SelectedValueChanged -= new EventHandler(CmbCat_SelectedIndexChanged);
        cb.SelectedValueChanged += new EventHandler(CmbCat_SelectedIndexChanged);
    

【参考方案1】：

我发现绑定数据有问题

DataPropertyName = "catID" 是只读属性，只有 getter 而没有像这样的 setter

public int catID
    
        get
        
            return CategoryManager.Categories.FirstOrDefault(x => x.Name.Equals(SubCategory, StringComparison.InvariantCultureIgnoreCase)).Id;
        
      

通过添加属性的setter解决了这个问题。