出处:http://dev.csdn.net/author/Knight94/acd529d8a91a42f6ba5996babf1395d4.html
作者:愚翁
转载:青弦 http://www.cnblogs.com/frostcity/archive/2008/08/21/1273310.html
首先是通过子窗体类型名来判断是否打开新的子窗体,还是把原有的子窗体进行显示。
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/// <summary>
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/// Open child window
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/// </summary>
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/// <param name="ChildTypeString"></param>
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private void OpenWindow(string ChildTypeString)
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{
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Form myChild = null;
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if (!ContainMDIChild(ChildTypeString))
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{
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// Get current process assembly
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Assembly assembly = Assembly.GetExecutingAssembly();
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// Create data type using type string
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Type typForm = assembly.GetType(ChildTypeString);
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// Create object using type's "InvokeMember" method
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Object obj = typForm.InvokeMember(null, BindingFlags.DeclaredOnly | BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.CreateInstance, null, null, null);
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// Show child form
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if (obj != null)
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{
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myChild = obj as Form;
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myChild.MdiParent = this;
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myChild.Show();
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myChild.Focus();
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}
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}
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}
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/// <summary>
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/// Search mdi child form by specific type string
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/// </summary>
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/// <param name="ChildTypeString"></param>
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/// <returns><eturns>
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private bool ContainMDIChild(string ChildTypeString)
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{
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Form myMDIChild = null;
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foreach (Form f in this.MdiChildren)
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{
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if (f.GetType().ToString() == ChildTypeString)
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{
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// found it
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myMDIChild = f;
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break;
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}
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}
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// Show the exist form
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if (myMDIChild != null)
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{
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myMDIChild.TopMost = true;
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myMDIChild.Show();
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myMDIChild.Focus();
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return true;
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}
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else
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return false;
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}
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以上两部分就可以对于每个子窗体只创建一个实例。那么调用以上代码就非常简单了。
如:
//Open a mdi child form which type named "MDIChild"
OpenWindow( typeof( MDIChild ).ToString() );
OpenWindow( typeof( MDIChild ).ToString() );