C# 如何解决“方法''的无重载需要0个参数”？
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原文地址: http://stackoverflow.com/questions/19517794/
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How to fix "No overload for method ' ' takes 0 arguments"?
提问by User
How can I fix this error?
我该如何解决这个错误？
"No overload for method 'output' takes 0 arguments".
“方法 'output' 没有重载需要 0 个参数”。
The error is at the very bottom at "fresh.output();".
错误位于“fresh.output();”的最底部。
I don't know what I'm doing wrong. Can someone tell me what I should do to fix the code?
我不知道我做错了什么。有人可以告诉我应该怎么做才能修复代码吗？
Here is my code:
这是我的代码：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace ConsoleApplication_program
{
public class Numbers
{
public double one, two, three, four;
public virtual void output(double o, double tw, double th, double f)
{
one = o;
two = tw;
three = th;
four = f;
}
}
public class IntegerOne : Numbers
{
public override void output(double o, double tw, double th, double f)
{
Console.WriteLine("First number is {0}, second number is {1}, and third number is {2}", one, two, three);
}
}
public class IntegerTwo : Numbers
{
public override void output(double o, double tw, double th, double f)
{
Console.WriteLine("Fourth number is {0}", four);
}
}
class program
{
static void Main(string[] args)
{
Numbers[] chosen = new Numbers[2];
chosen[0] = new IntegerOne();
chosen[1] = new IntegerTwo();
foreach (Numbers fresh in chosen)
{
fresh.output();
}
Console.ReadLine();
}
}
}
回答by Bill Gregg
It's telling you that the method "output" needs arguments. Here's the signature for "output":
它告诉您方法“输出”需要参数。这是“输出”的签名：
public override void output(double o, double tw, double th, double f)
So if you want to call that you need to pass in four doubles.
因此，如果您想调用它，则需要传入四个双打。
fresh.output(thing1,thing2,thing3,thing4);
Or to use hard coded values as an example:
或者以硬编码值为例：
fresh.output(1,2,3,4);
回答by codeling
You're calling the outputmethod with 0 (zero) parameters, but you have declared it to receive 4 double values. The compiler doesn't know what it should call, since there is no outputmethod with no parameter.
您正在output使用 0（零）个参数调用该方法，但您已声明它接收 4 个双精度值。编译器不知道它应该调用什么，因为没有output没有参数的方法。
回答by Mikael ?stberg
All your implementations of method outputtakes arguments. Supply the arguments and you should be able to compile.
你所有的方法实现都output需要参数。提供参数，您应该能够编译。
Like this:
像这样：
fresh.output(1, 2, 3, 4);
回答by Chris Mantle
There's no method named outputthat takes 0 arguments, there's only one that accepts 4 arguments. You must pass parameters to output():
没有命名的方法output接受 0 个参数，只有一个接受 4 个参数。您必须将参数传递给output()：
foreach (Numbers fresh in chosen)
{
fresh.output(o, tw, th, f);
}
回答by Manoj Naik
fresh.output()expect 2 parameters and you're not providing them
fresh.output()期望 2 个参数，而您没有提供它们
