C#限制MDI子窗体重复打开——C#判断窗体是否已经打开 多种方法 2012-06-26更新

private bool HaveOpened(Form 父窗体, string 子窗体Name)
{
//查看窗口是否已经被打开
bool bReturn = true;
for (int i = 0; i < 父窗体.MdiChildren.Length; i++)
{
if (父窗体.MdiChildren[i].Name == 子窗体Name)
{
父窗体.MdiChildren[i].BringToFront();
bReturn = false;
break;
}
}
return bReturn;
}

Form1 f1=new Form();
if (HaveOpened(父窗体, "子窗体Name"))
{
f1.MdiParent = 父窗体;
f1.Show();
}

/// <summary>
/// 判断是否打开Mdi的窗口,如打开则得到窗口
/// </summary>
/// <param name="asFormName"></param>
/// <returns></returns>
public Form CheckMdiFormIsOpen(string asFormName)
{
Form form = null;
foreach (Form frm in Application.OpenForms)
{
if (frm.Name == asFormName)
{
form = frm;
break;
}
}
return form;
}

private bool ContainMDIChild(string childTypeString)
{
Form form = null;
foreach (Form form2 in base.MdiChildren)
{
if (form2.GetType().ToString() == childTypeString)
{
form = form2;
break;
}
}
if (form != null)
{
//form.TopMost = true;
form.Show();
form.Focus();
return true;
}
return false;
}

private bool ContainChild(string childTypeString)
{
Form form = null;
foreach (Form form2 in Application.OpenForms)
{
if (form2.GetType().ToString() == childTypeString)
{
form = form2;
break;
}
}
if (form != null)
{
//form.TopMost = true;
form.Show();
form.Focus();
return true;
}
return false;
}