c#取外部自绘listview内容

如果您想获取外部自绘的ListView控件的内容，可以使用以下代码：

[DllImport("user32.dll")]
private static extern IntPtr SendMessage(IntPtr hWnd, int msg, IntPtr wp, IntPtr lp);

private const int LVM_GETITEMCOUNT = 0x1000 + 4;
private const int LVM_GETITEMTEXT = 0x1000 + 45;

public List<string> GetListViewItems(IntPtr listViewHandle)
{
    List<string> items = new List<string>();

    int count = (int)SendMessage(listViewHandle, LVM_GETITEMCOUNT, IntPtr.Zero, IntPtr.Zero);

    for (int i = 0; i < count; i++)
    {
        StringBuilder sb = new StringBuilder(256);
        IntPtr result = SendMessage(listViewHandle, LVM_GETITEMTEXT, (IntPtr)i, sb);
        if (result.ToInt32() > 0)
        {
            items.Add(sb.ToString());
        }
    }

    return items;
}

其中，`listViewHandle`是外部ListView控件的句柄。调用`GetListViewItems`方法后，将返回一个包含ListView中所有项的字符串列表。