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我在第一列中有 aDataGridView与a和 a绑定（我没有设置 valeumember，因为我想在访问值时获取 myclass ）。第二列也是。它将基于第一个selectedValue 绑定到一些。DataGridViewComboBoxColumnList<MyClass>DisplayMember="name"DataGridViewComboBoxColumnList<String>DataGridViewComboBoxColumn

所有这些工作都很好，当我更改第一个DataGridViewComboBoxColumn.DataSource. 当我向数据源添加一个新的 Myclass 时，它可以工作，但是如果我选择该类，我会收到一个错误：

System.ArgumentException：DataGridViewComboBoxCell 值无效

代码：

//Set columns to Datagridview  
DataGridViewImageColumn btnEdit = new DataGridViewImageColumn();  
Image gear = (System.Drawing.Image)Properties.Resources.gear;  
btnEdit.Image = gear;  
datagridview.Columns.Add(btnEdit);  

//Table  
DataGridViewComboBoxColumn cbTable = new DataGridViewComboBoxColumn();  
cbTable.HeaderText = "Table";  
cbTable.Name = "Table";  
cbTable.DisplayMember = "NameToShow";  
//tableDataSource = cbTable.DataSource;  
//cbTable.DataSource = moduleClone.SqlQuery.Tables;  
datagridview.Columns.Add(cbTable);  

//...  
//...  
//...  

//Load data  
((DataGridViewComboBoxColumn)datagridview.Columns[1]).DataSource = (List<Table>)moduleClone.SqlQuery.Tables;  
//Work just fine  

//...  
//...  
//...  

//Now if i reload de data  
datagridview.Rows.Clear();  
((DataGridViewComboBoxColumn)datagridview.Columns[1]).DataSource = (List<Table>)moduleClone.SqlQuery.Tables;  
//This give me one message box with the exception several times when drawing the gridview.
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1 回答 1

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好的，我找到了适合我的解决方案。而是用DataGridViewComboBoxColumn.DataSource，我直接改DataGridViewComboBoxColumn.Items。有问题，因为DataGridViewComboBoxColumn.Items如果DataGridViewComboBoxColumn.DataSource已设置，您无法更改。所以我DataGridViewComboBoxColumn.DataSource = null在编辑之前定义DataGridViewComboBoxColumn.Itens。

代码：

//Set columns to Datagridview  
DataGridViewImageColumn btnEdit = new DataGridViewImageColumn();  
Image gear = (System.Drawing.Image)Properties.Resources.gear;  
btnEdit.Image = gear;  
datagridview.Columns.Add(btnEdit);  

//Table  
DataGridViewComboBoxColumn cbTable = new DataGridViewComboBoxColumn();  
cbTable.HeaderText = "Table";  
cbTable.Name = "Table";  
cbTable.DisplayMember = "NameToShow";  
datagridview.Columns.Add(cbTable);  

//...  
//...  
//...  

//Load data  
((DataGridViewComboBoxColumn)datagridview.Columns[1]).Itens = (List<Table>)moduleClone.SqlQuery.Tables;  
//Work just fine  

//...  
//...  
//...  

//Now I reload de data  
datagridview.Rows.Clear();
((DataGridViewComboBoxColumn)datagridview.Columns[1]).DataSource = null; 
((DataGridViewComboBoxColumn)datagridview.Columns[1]).Items.clear();
((DataGridViewComboBoxColumn)datagridview.Columns[1]).Items= (List<Table>)moduleClone.SqlQuery.Tables;
于 2012-10-16T09:21:29.510 回答