在运行时任意指定对象的创建类型,甚至是用表示类型的名字的字符串创建所需的对象,.net Framwork的反射机制给我们带来了解决问题的方法。这里,若只需要创建一般的对象,我们可以通过System.Activator来实现,而较复杂的我们可以通过获取构造方法来实现。
反射Reflection是.net中重要机制,通过反射,可以在运行时获得.net中每一个类型(包括类、结构、委派、接口、枚举)的成员,包括方法、属性、事件以及构造函数等,还可以获得每个成员的名称、限定符和参数等,有了反射,就可以对每一个类型了如指掌。如果获得了构造函数的信息,就可以直接创建对象,即使这个对象的类型在编译的时候还不知道。
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/// <summary>
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/// CreateNewControls 根据空间的名称,类型字符串,大小、位置去动态的生成一个控件
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/// </summary>
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/// <param name="targetControl"> 控件加载到的容器</param>
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/// <param name="ctlName">生成的控件实例名称</param>
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/// <param name="ctlType">生成的控件类型字符串如(TextBox、Button等)</param>
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/// <param name="ctlSize">控件的大小</param>
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/// <param name="ctlLocation">控件的位置</param>
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/// <returns>生成的控件实例</returns>
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private Control CreateNewControls(Control.ControlCollection targetControl,string ctlName,Type ctlType, System.Drawing.Size ctlSize,System.Drawing.Point ctlLocation)
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{
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Control toCreate;
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toCreate = (Control)System.Activator.CreateInstance(ctlType);
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toCreate.Name = ctlName;
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toCreate.Size = ctlSize;
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toCreate.Location = ctlLocation;
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targetControl.Add(toCreate);
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return toCreate;
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}
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Size cbSize = new Size(160,40);
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Point cbPoint = new Point(64,206);
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Control c1 = CreateNewControls(this.Controls,"control1",Type.GetType("System.Windows.Forms.CheckBox, System.Windows.Forms, Version=1.0.5000.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"),cbSize,cbPoint);
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c1.Text =" Check Box";
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.ne tFramework 1.1上,Type.GetType("System.Windows.Forms.CheckBox, System.Windows.Forms,Version=1.0.5000.0,Culture=neutral, PublicKeyToken=b77a5c561934e089")。
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我们如何取得所用Windows.Form程序集的版本和强名称?可以用GetType(CheckBox).AssemblyQualifiedName这样的语法,一旦得到了这些信息,我们就可以将这些信息用于其它任何控件,因为他们都来自于同一个版本Windows.Forms程序集。
(来源:CSDN)
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