如何更新 Listview（Windows 窗体）？

Question

在 ListView 中，我提取了一些特定的行。我可以在 MessageBox 中正确显示输出。但是如何在我的 ListView 中更新和显示输出？非常感谢您的帮助！

ArrayList listing = new ArrayList();
for (int i = 0; i < listView1.Items.Count; i++)
{
  int columnNumb = 0; 
  string columnOne= " ";
  string columnTwo = " "; 
  columnOne += listView1.Items[i].Text;
  columnNumb += int.Parse(listView1.Items[i].SubItems[1].Text);
  columnTwo += listView1.Items[i].SubItems[2].Text;
            
  if(columnNumb >= 5)
  {
     listing.Add($"{ columnOne } , {columnNumb} , {columnTwo}");
  }
                
}
        
  StringBuilder sb = new StringBuilder();
  foreach (string line in listing)                      
  sb.AppendLine(line.ToString());
  MessageBox.Show(sb.ToString());

enter image description here

Answer 1

也许这篇文章就是你要找的https://docs.microsoft.com/en-us/dotnet/desktop/winforms/controls/how-to-make-thread-safe-calls-to-windows-forms-controls?view=netframeworkdesktop-4.8#:~:text=InvokeRequired%20property%2C%20which%20compares%20the,different%2C%20it%20calls%20the%20Control

总而言之，您要做的是调用函数，在我的情况下，您希望使用参数设置值字符串 b：

SetList(b);

在函数范围之外声明一个委托，如下所示：

delegate void SetListViewCallBacks(string yourtext);

以及在每个回调中设置列表视图项的函数：

private void SetList(string yourtext)
{
    // InvokeRequired required compares the thread ID of the
    // calling thread to the thread ID of the creating thread.
    // If these threads are different, it returns true.
    if (this.listView1.InvokeRequired)
    {
        SetListViewCallBacks d = new SetListViewCallBacks (SetList);
        this.Invoke(d, new object[] { yourtext });
    }
    else
    {
        this.listView1.Items.Add(yourtext);

    }
} 

我还没有测试过，但我的逻辑是这会像这样工作。