private int chFlag = 1;//记录是否触发全选事件
//设置全选按钮状态
private void SetCheckState()
{
string flag = "";
for (int i = 0; i < lvUser.Items.Count; i++)
{
flag += lvUser.Items[i].Checked.ToString().ToLower();
}
if (!flag.Contains("true"))
{
chFlag = 2;
cbAll.Checked = false;
chFlag = 1;
}
if (!flag.Contains("false"))
{
chFlag = 1;
cbAll.Checked = true;
}
if (flag.Contains("true") && flag.Contains("false"))
{
chFlag = 2;
cbAll.Checked = false;
chFlag = 1;
}
}

//列表选中事件
private void lvUser_ItemChecked(object sender, ItemCheckedEventArgs e)
{
chFlag = 1;
SetCheckState();
}

//全选按钮事件
private void cbAll_CheckedChanged(object sender, EventArgs e)
{
if (chFlag != 2)
{
if (lvUser.Items.Count > 0)
{
if (cbAll.Checked)
{
foreach (ListViewItem item in lvUser.Items)
{
item.Checked = true;
}
}
else
{
foreach (ListViewItem item in lvUser.Items)
{
item.Checked = false;
}
}
}
}
}