单击 datagridview 上的错误列时无法投射错误

如何解决单击 datagridview 上的错误列时无法投射错误

我在 Windows 窗体中有一个数据网格，有 3 列。一种是按钮类型，应该是可点击的，并且确实有效。但是，如果我错误地单击了其他 2 列，则会出现如下所述的异常错误。我理解这个错误，因为我的意图是将单击的单元格 Button 转换为相同类型的局部变量。我想知道的是如何防止点击另外两列时出现异常。

代码如下：

         private: System::Void dataGridView19_CellContentClick(System::Object^ sender,System::Windows::Forms::DataGridViewCellEventArgs^ e) {
           DataGridViewButtonCell^ cell = (DataGridViewButtonCell^)dataGridView19->CurrentCell;
           Console::WriteLine("Speaking ");
           SimVoice[Convert::ToInt16(dataGridView19->CurrentRow->Cells["dataGridViewTextBoxColumn33"]->Value)]->speak();

      };

这里是错误：

>     system.invalidCastException: Unable to cast object of type 
      'System.Windows.Forms.DataGridViewTextBoxCell' to type 
      'System.Windows.Forms.DataGridViewButtonCell'.
       at CppCLRWinformsProjekt.Form1.dataGridView19_CellContentClick(Object sender,DataGridViewCellEventArgs e) in F:\WindowsProjects\CppCLR_WinformsP3-V1 - 
      7\CppCLR_WinformsProjekt3\Form1.h:line 2785
        at 
       System.Windows.Forms.DataGridView.OnCellContentClick(DataGridViewCellEventArgs e)
   at System.Windows.Forms.DataGridView.OnCommonCellContentClick(Int32 columnIndex,Int32 rowIndex,Boolean doubleClick)
   at 
  
  
 System.Windows.Forms.DataGridViewCell.onmouseupInternal(DataGridViewCellMouseEventArgs e)
   at System.Windows.Forms.DataGridView.OnCellMouseUp(DataGridViewCellMouseEventArgs e)
   at System.Windows.Forms.DataGridView.onmouseup(MouseEventArgs e)
   at System.Windows.Forms.Control.WmMouseUp(Message& m,MouseButtons button,Int32 clicks)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd,Int32 msg,IntPtr wparam,IntPtr lparam)

谢谢，克里斯

解决方法

来自：How to handle click event in Button Column in Datagridview?

我认为这就是答案。如果有更好的方法，请告诉我。

if (e->ColumnIndex == dataGridView19->Columns["dataGridViewButtonColumn7"]->Index && e->RowIndex >= 0) {
        DataGridViewButtonCell^ cell = (DataGridViewButtonCell^)dataGridView19->CurrentCell;
        Console::WriteLine("Speaking ");
        SimVoice[Convert::ToInt16(dataGridView19->CurrentRow->Cells["dataGridViewTextBoxColumn33"]->Value)]->speak();

        //Console::WriteLine("Button on row {0} clicked",e->RowIndex);
    }