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I agree in general but you know, statically, what the type of the second item of a Tuple is. If the Tuple is Tuple<T, U> then the type of the second item is U.
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Hello,
In the following function, I am trying to return two (2) values instead of one. Can someone please say how this can be done? I was thinking possibly returning an array from the function, but I do not know if this is possible. Does anyone have an idea of how multiple values can be obtain from the same function?
Thanks.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace Testing_Functions
{
class Program
{
public static Double Test(Double Val1, Double Val2, Double Val3)
{
Double Test_Val = Val1 + Val2 + Val3;
Double Second_Test = Test_Val % 2;
return Test_Val;
}
static void Main(string[] args)
{
Double A = 1, B = 2, C = 3;
Double Result = Test(A,B,C);
}
}
}
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There are a few ways of obtaining multiple values.
1. Create an struct/class that holds more than one value
2. Use an array or list (the same as 1 really)
3. Use an out (or ref if needed) parameter.
1:
public class Pair<T>
{
private T first;
private T second;
public Pair(T first, T second)
{
this.first = first;
this.second = second;
}
public T First { get { return first; } }
public T Second { get { return second; } }
}
public static Double Test(Double Val1, Double Val2, Double Val3)
{
Double Test_Val = Val1 + Val2 + Val3;
Double Second_Test = Test_Val % 2;
return new Pair<Double>(Test_Val, Second_Test);
}
2 should be straight forward.
3:
public static Double Test(Double Val1, Double Val2, Double Val3, out Double secondResult)
{
Double Test_Val = Val1 + Val2 + Val3;
secondResult = Test_Val % 2;
return Test_Val;
}
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out and ref parameters are usually considered to be dirty, so stay away from that if you can.
Depending on what the function does, you may want to create a wrapper class or struct for the result. That means that you get semantically useful names, instead of First and Second from the Pair class.
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Also, he could return a Tuple<type,type> but by far the best is solution 1.
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Use ref and out keyword to return multiple values from function
return statement returns only single value.
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the quick and dirty way:
public static Double[] Test(Double Val1, Double Val2, Double Val3)
{
Double Test_Val = Val1 + Val2 + Val3;
Double Second_Test = Test_Val % 2;
double [] arr = { Test_Val, Second_Test };
return arr;
}
Just to show you, you can return virtually anything, including Lists, Dictionaries, self made object (like the Pair example)
V.
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Please am working on an application that use datagrid view but am looking for tutorial or code that i can use to insert,update record that i retrieved from the database.
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Don't use short URL's. People have no idea where that URL is actually going.
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I wanna know, is it possible to read windows 7 User account password from the windows registry? 
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A Reset Tool downloaded here[^].
Bastard Programmer from Hell 
if you can't read my code, try converting it here[^]
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I want to know can we write a piece of code in c# that gets it from registry or not?
even is the windows password saved in registry or not?
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No.
Bastard Programmer from Hell
if you can't read my code, try converting it here[^]
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Kuthuparakkal wrote: Since a hash function is one-way, this provides some measure of security for the storage of the passwords.
..which means you can read the hash, but not the password.
Kuthuparakkal wrote: Boot with some instant (DVD) os and read it.
..and end up with useless data; it's not possible to get the key, decrypt the hash and find the matching password. You could wipe out the entire section with a tool, but that's about it.
Bastard Programmer from Hell
if you can't read my code, try converting it here[^]
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No hacker has the required resources.
Bastard Programmer from Hell
if you can't read my code, try converting it here[^]
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No, there are people out there who know how to get the hashes. After that, you have to brute-force dictionary attack the hashes to get the passwords which can take a considerable amount of time.
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Not yet, as far as I know. At least, not if the password isn't short (or findable by a dictionary attack).
On XP and previous, it was trivial to crack that nice LM hash, but Vista+ doesn't store the LM hash anymore.
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<pre lang="c#"></pre>Error 1 An object reference is required for the non-static field, method, or property 'ConsoleApplication_FileTest.Program.GetAverageSalary(string)' C:\Users\Dawn\documents\visual studio 11\Projects\ConsoleApplication_FileTest\ConsoleApplication_FileTest\Program.cs 98 24 ConsoleApplication_FileTest
<pre lang="c#"><pre>static void Main(string[] args)
{
Dictionary<string, double> averages = new Dictionary<string, double>();
string filename = "c:\\test.txt";
averages = GetAverageSalary(filename)
} </pre></pre>
=====================
<pre lang="c#"> Dictionary<string, double> GetAverageSalary(string filename)
{
... </pre>
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Your method main() is static.
Your method GetAverageSalary() is not. So it MUST have an object instance of type Program.
But I suspect you might solve it by making GetAverageSalary() static. However that depends on what you are trying to learn.
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How do I mae an object instance of type Program?
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