DataGridView中的明显内存泄漏

Question

如何强制DataGridView释放对绑定DataSet的引用？

我们在DataGridView中显示了一个相当大的数据集,并注意到DataGridView关闭后资源没有被释放.如果用户反复查看此报告,则最终会出现内存不足异常.ANTS Memory Profiler确认DGV尽管dgv.DataSource设置为null 仍保持引用.

Answer 1

强制 DataGridView 释放资源的技巧是通过中间对象进行绑定BindingSource。

代码看起来像这样：

...
DataGridView dgvQueryResults;
DataTable m_dataTable;
BindingSource m_binder;

public void PopulateView()
{
  ...
  // Bind the data source through and intermediary BindingSource
  m_binder.DataSource = m_dataTable;
  dgvQueryResults.DataSource = m_binder;
  ...
}


/// <summary>
/// Frees lindering resources. Sets data bindings to null and forces 
/// garbage collection.
/// </summary>
private void ResetDataGridView()
{
  dgvQueryResults.DataSource = null;

  if (null != m_binder) m_binder.DataSource = null;
  m_binder = null;

  dataTable = null;

  // Force garbage collection since this thing is a resource hog!
  GC.Collect ();

  m_binder = new BindingSource ();
}

...