仅当 isReadOnly 为 false 时才转换为模型时出现 Datagrid 错误？

Question

我有 Datagrid，我想将每一行的数据转换为特定模型。铸造代码是

        private List<SearchAndReplaceModel> getSelectedWordes()
        {
           DGKeywords.UnselectAllCells();
           var repo = new SearchAndReplaceRepository();
          List<SearchAndReplaceModel> selectedWordes = new List<SearchAndReplaceModel>();
           List<SearchAndReplaceModel> dataFromGrid=DGKeywords.Items.Cast<SearchAndReplaceModel>().ToList();
           if (dataFromGrid != null)
            for (int i = 0; i < dataFromGrid.Count; i++)
            {
                selectedWordes.Add ( dataFromGrid[i]);
            }
           return selectedWordes;
        }

奇怪的是，当 Datagrid isReadOnly=true 的属性时代码运行完美，但当我将其更改为 isReadOnly=false

时出现异常

异常：

Exception thrown: 'System.InvalidCastException' in System.Core.dll An exception of type 'System.InvalidCastException' occurred in System.Core.dll but was not handled in user code Unable to cast object of type 'MS.Internal.NamedObject'

Answer 1

使用 .OfType() 扩展方法而不是 .Cast():

private List<SearchAndReplaceModel> getSelectedWordes()
{
   DGKeywords.UnselectAllCells();
   return DGKeywords.Items.OfType<SearchAndReplaceModel>().ToList();
}

或者迭代 DGKeywords.ItemsSource 可能更简单（取决于 DataGrid 填充数据的方式）

仅当 isReadOnly 为 false 时才转换为模型时出现 Datagrid 错误？

Datagrid error when casting to model only when isReadOnly is false?

c#

wpf

datagrid