在 C# 中传递通用 List<>
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Passing a generic List<> in C#
提问by RockySanders99
I am going brain dead on this; I have several List' defined, based on specific classes (c1, c2, c3...). I have a method that will process information on these lists. 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. I know its possible, but I cant seem to get the syntax right on the method side. so, for example:
我快要死了；我根据特定的类（c1、c2、c3...）定义了几个 List'。我有一种方法可以处理这些列表上的信息。我想要做的是传入特定列表，但让方法接受通用列表，然后通过 typeof 确定要执行的特定工作。我知道这是可能的，但我似乎无法在方法方面获得正确的语法。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
提前致谢 R. Sanders
采纳答案by JSB????
You need to declare some_methodto be generic, as well.
您还需要声明some_method为泛型。
void SomeMethod<T>(List<T> someList)
{
if (typeof(T) == typeof(c1))
{
// etc
}
}
回答by GxG
in the parameter section put List then try in the code
switch(typeof(T){case typeof(int): break;})
在参数部分放 List 然后在代码中尝试
switch(typeof(T){case typeof(int): break;})
回答by Brian Hasden
Careful with the use of typeof(typ1) == typeof(typ2). That will test to see if the types are equivalent disregarding the type hierarchy.
小心使用 typeof(typ1) == typeof(typ2)。这将测试以查看类型是否等效，而不管类型层次结构。
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. An example is below:
检查对象是否属于某种类型的更好方法是使用“is”关键字。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");
}
}
