[英]Passing a generic List<> in C#
I am going brain dead on this; 我脑子里死了; I have several List' defined, based on specific classes (c1, c2, c3...).
我根据特定的类(c1,c2,c3 ......)定义了几个List'。 I have a method that will process information on these lists.
我有一个方法来处理这些列表上的信息。 What I want to do is pass in the specific list, but have the method accept the generic list, and then via typeof determine what specific work to do.
我想要做的是传递特定列表,但让方法接受通用列表,然后通过typeof确定要执行的具体工作。 I know its possible, but I cant seem to get the syntax right on the method side.
我知道它可能,但我似乎无法在方法方面获得正确的语法。 so, for example:
所以,例如:
List<c1> c1var;
List<c2> c2var;
List<c3> c3var;
some_method(c1var);
some_method(c2var);
some_method(c3var);
class some_thing
some_method(List<> somevar)
if typeof(somevar).name = x then
esle if typeof(somevar).name = y then....
How do I set up the parameter list for the method? 如何设置方法的参数列表?
thanks in advance R. Sanders 谢谢R.桑德斯
You need to declare some_method
to be generic, as well. 您还需要声明
some_method
是通用的。
void SomeMethod<T>(List<T> someList)
{
if (typeof(T) == typeof(c1))
{
// etc
}
}
Careful with the use of typeof(typ1) == typeof(typ2). 小心使用typeof(typ1)== typeof(typ2)。 That will test to see if the types are equivalent disregarding the type hierarchy.
这将测试以查看类型是否等同于忽略类型层次结构。
For example: 例如:
typeof(MemoryStream) == typeof(Stream); // evaluates to false
new MemoryStream() is Stream; //evalutes to true
A better way to check to see if an object is of a type is to use the 'is' keyword. 检查对象是否属于某种类型的更好方法是使用'is'关键字。 An example is below:
一个例子如下:
public static void RunSnippet()
{
List<c1> m1 = new List<c1>();
List<c2> m2 = new List<c2>();
List<c3> m3 = new List<c3>();
MyMeth(m1);
MyMeth(m2);
MyMeth(m3);
}
public static void MyMeth<T>(List<T> a)
{
if (a is List<c1>)
{
WL("c1");
}
else if (a is List<c2>)
{
WL("c2");
}
else if (a is List<c3>)
{
WL("c3");
}
}
在参数部分放入List然后尝试在代码switch(typeof(T){case typeof(int): break;})
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