//图书借阅按钮事件处理
private void tsbtnIssue_Click(object sender, EventArgs e)
{
if (this.checkchildfrm("frmIssueBook") == true)
{
return;
}
frmIssueBook issuebook = new frmIssueBook();
issuebook.MdiParent = this;
issuebook.Show();
}
private void tsbtnIssue_Click(object sender, EventArgs e) //图书借阅
{
if (this.checkchildfrm("frmIssueBook") == true) //检测该窗口是否处于打开状态
{
return; //窗口已打开，返回
}
frmIssueBook issuebook = new frmIssueBook(); //实例化图书借阅窗体
issuebook.MdiParent = this; //设置为当前窗体的子窗体
issuebook.Show(); //图书借阅以非模式对话框的方式打开
}