Methods can have the name but different parameter types.
The following code defines a class, Math.
Math has two methods with the same name. It is legal since the signatures are different.
using System;
class Math
{
public static int add(int i, int j)
{
return i + j;
}
public static float add(float f, float f2)
{
return f + f2;
}
}
class Program
{
static void Main(string[] args)
{
Console.WriteLine(Math.add(1, 2));
Console.WriteLine(Math.add(1.1F, 2.2F));
}
}
params is not part of the signature.
class Math{
static void sum(int[] anArray){
}
static void sum(params int[] anArray){
}
}
Compile-time error
C:\g>csc Program.cs
Microsoft (R) Visual C# 2010 Compiler version 4.0.30319.1
Copyright (C) Microsoft Corporation. All rights reserved.
Program.cs(9,17): error CS0111: Type 'Math' already defines a member called
'sum' with the same parameter types
Program.cs(5,17): (Location of symbol related to previous error)
The return type is not part of the signature.
class Math{
int add(int i, int j){
return i+j;
}
float add(int i, int j){
return (float)(i+j);
}
}
Compile-time error.
C:\g>csc Program.cs
Microsoft (R) Visual C# 2010 Compiler version 4.0.30319.1
Copyright (C) Microsoft Corporation. All rights reserved.
Program.cs(9,11): error CS0111: Type 'Math' already defines a member called
'add' with the same parameter types
Program.cs(5,9): (Location of symbol related to previous error)