【问题标题】:Copy cell with header from datagridview从 datagridview 复制带有标题的单元格
【发布时间】:2017-12-10 16:00:27
【问题描述】:

我想从带有列标题的 datagridview 中复制一个单元格。 (不是行标题)。

我试过了,但我得到了一个例外:

if (dataGridView1.GetCellCount(DataGridViewElementStates.Selected) > 0)
{
    foreach (DataGridViewColumn c in dataGridView1.Columns)
    {
        c.SortMode = DataGridViewColumnSortMode.NotSortable;
    }

    dataGridView1.SelectionMode = DataGridviewSelectionMode.ColumnHeaderSelect;                 //only the column headers will be copied
    dataGridView1.ClipboardCopyMode = DataGridViewClipboardCopyMode.EnableWithAutoHeaderText;   //.EnableWithAutoHeaderText;
                                                                                                                                // Add the selection to the clipboard.
    Clipboard.SetDataObject(dataGridView1.GetClipboardContent());  //Here it goes wrong
}

这是我得到的例外。 GetClipboard 内容为空?

System.ArgumentNullException: 'Value cannot be null.
Parameter name: data'

System.ArgumentNullException occurred
  HResult=0x80004003
  Message=Value cannot be null.
Parameter name: data
  Source=System.Windows.Forms



StackTrace:
   at System.Windows.Forms.Clipboard.SetDataObject(Object data, Boolean copy, Int32 retryTimes, Int32 retryDelay)
   at System.Windows.Forms.Clipboard.SetDataObject(Object data)
   at Q_ProtoType.FormMain.MenuItemNew_Click(Object sender, EventArgs e) in c:\Data\Programma\Development\VSSource - oefen_new_functions\Q_ProtoType\Q_ProtoType\FormMain.cs:line 895
   at System.Windows.Forms.MenuItem.OnClick(EventArgs e)
   at System.Windows.Forms.MenuItem.MenuItemData.Execute()
   at System.Windows.Forms.Command.Invoke()
   at System.Windows.Forms.Command.DispatchID(Int32 id)
   at System.Windows.Forms.Control.WmCommand(Message& m)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.DataGridView.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
   at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
   at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(IntPtr dwComponentID, Int32 reason, Int32 pvLoopData)
   at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
   at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
   at System.Windows.Forms.Application.Run(Form mainForm)
   at Q_ProtoType.Program.Main() in c:\Data\Programma\Development\VSSource - oefen_new_functions\Q_ProtoType\Qx_ProtoType\Program.cs:line 42

【问题讨论】:

  • 然后向我们展示异常
  • 我编辑了问题并添加了例外
  • 你添加了异常吗?它在哪里?

标签: c# .net winforms datagridview


【解决方案1】:

您已将ColumnHeaderSelect 设置为FullColumnSelect。因此,在调用GetClipboardContent 时,您应该至少选择一列,否则您将收到一个空值作为剪贴板内容,ClipBoard.SetDataObject 将抛出一个ArgumentNullException

如果要全部导出,可以使用dataGridView1.SelectAll();选择所有列,或者例如如果要选择第一列,可以设置dataGridview1.Columns[0].Selected = true;

【讨论】:

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