如何为表单控件创建模板函数? [英] How do I create a template function for controls of a form?
问题描述
该声明将改变表单对象的位置。
This statement will change the position of a form object.
lblMessage.Location = new Point(0,0);
我想写一个泛型模板函数目的。
我想出了这个,但它是无效的:
I came up with this, but it is invalid:
public void ChangePosition<T>(T form_object)
{
form_object.Location = new Point(0,0);
}
我这样称呼:
and I call it like this:
ChangePosition(lblMessage);
错误:'T'不包含'位置'并且没有
的扩展方法'Location'接受类型'T'
的第一个参数可以被找到(你是否缺少using指令或汇编
引用?)
Error: 'T' does not contain a definition for 'Location' and no extension method 'Location' accepting a first argument of type 'T' could be found (are you missing a using directive or an assembly reference?)
我需要在模板函数中提到某种接口吗?我如何调用泛型类型的扩展方法?
Do I need to mention some kind of interface on the template function? How do I call an extension method on a generic type?
推荐答案
您可以将添加到T:Control
函数的定义。 Control
是定义点位置
的层级中的最高点。
What you can do is add where T : Control
onto the definition of the function. Control
is the highest point in the hierarchy that defines the Point Location
.
public void ChangePosition<T>(T form_object) where T : Control
{
form_object.Location = new Point(0,0);
}
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