在开发Winform项目中，经常会要切换不同的窗体。通常程序都有一个主窗体，在切换窗体时往往需要关闭其他子窗体，这个实例就来介绍MDI主窗体内嵌子窗体的实现方法。

MDI主窗体要设置一个比较重要的属性，IsMdiContainer=true。子窗体的 formChild.MdiParent设置成为主窗体。

        public MainForm(){InitializeComponent();//设置改窗体为MDI容器(多文档界面容器)，可嵌入多个子窗体this.IsMdiContainer = true;}/// <summary>/// 通过子窗体名，打开子窗体/// </summary>/// <param name="childFromName"></param>/// <returns></returns>private void OpenChildFrom(string childFromName){bool bHave = false;//子窗体已存在 则打开foreach (Form formChild in this.MdiChildren){if (formChild.Name == childFromName){formChild.MdiParent = this;formChild.Activate();formChild.StartPosition = FormStartPosition.Manual;//填满主窗体空间formChild.Dock= DockStyle.Fill;formChild.Show();bHave = true;}else{formChild.Hide();}}//子窗体不存在 创建并打开if (bHave == false){Form formChild = InitializeFormByName(childFromName);if (formChild != null){formChild.MdiParent = this;formChild.StartPosition = FormStartPosition.Manual;//填满主窗体空间formChild.Dock = DockStyle.Fill;formChild.Show();}}}

程序实例链接：https://download.csdn.net/download/lvxingzhe3/89422924