How to get common string from the list of strings from for loop in C#

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I have a Dictionary which contains string and structure in the below format

C#

Dictionary<string, List<Structure>> myDic = new Dictionary<string, List<Structure>>();

string[] tests = new string[] { "test", "test2", "test3", "test4" };

foreach (string test in tests)
{
    myDic.Add(value, new List<Structure>{ });
}

struct Structure
{
string name1;
string name2;

}

From the below code, I am printing 2 things
One is key (from list of "tests") and the other is the outputs that I have generated through different part of the code which is not mentioned here

for (int p=0; p< myDictionary.Keys.Count; p++)
{
    string key = myDictionary.ElementAt(p).Key;
    Console.WriteLine("The output Key is: " + key);

    for (int q = 0; q < myDictionary.ElementAt(p).Value.Count; q++)
    {
        string value = myDictionary.ElementAt(p).Value.ElementAt(q).name2;
        Console.WriteLine("The output value is: " + value);
    }
}

The output of the code goes as follows (I am iterating through count of "tests")
for iteration0:
The output key is: test1
The output value is: A

for iteration1:
The output key is: test2
The output value is: A
The output value is: B

for iteration2:
The output key is: test3
The output value is: A
The output value is: E
The output value is: F

for iteration3
The output key is: test4
The output value is: A

REQUIRED ALGORITHM:

Since A is present common in all iterations for test1, test2, test3 and test4
Output should be A for all the test1, test2 and test3, test4

If suppose iteration3 doesn't have A,
then output should be A for test1, test2 and test3 and test4 should return an exception

What I have tried:

I have tried few things but couldn't get it right

Posted 29-Mar-22 5:16am

enoughIsenough

Updated 29-Mar-22 20:35pm

v7

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Comments

Richard Deeming 29-Mar-22 12:18pm

That's an odd way to iterate over a dictionary!

foreach (KeyValuePair<string, List<Structure>> pair in myDictionary)
{
    string key = pair.Key;
    Console.WriteLine("The output Key is: " + key);
    foreach (Structure item in pair.Value)
    {
        string value = item.name2;
        Console.WriteLine("The output value is: " + value);
    }
}

Beyond that, your explanation of the "required algorithm" is far from clear to me.

Maciej Los 29-Mar-22 14:56pm

Sounds like an answer ;)

enoughIsenough 30-Mar-22 2:19am

Hi @Richard, Thanks for making it simple, for iterating over a dictionary

From the comment that you've added for iterating over a dictionary, the output is as I have mentioned in my question.

THE OUTPUT GOES LIKE BELOW:
The key prints test1, test2, test3, test4 as outputs // (foreach KeyValuePair<string, list<structure="">> pair in myDictionary)

and the value prints
A for test1 iteration
A, B for test2 iteration
A, C, D for test3 iteration
A, C, F for test4 iteration

Now since A is common for all the tests (which is test1, test2, test3 and test4)

I need my output over as
"The output key is: test1, the output value is A"
"The output key is: test2, the output value is A"
"The output key is: test3, the output value is A"
"The output key is: test4, the output value is A"

/////////////////////////////////////////////////////////////////////////////////////////////////////////////

If there is no common value for all the Keys(test1, test2, test3 and test4), then I need to throw an exception

That is, if the
The Key is: test1
The value is: A

The Key is: test2
The value is: B

The Key is: test3
The value is: C

The Key is: test4
The value is: D

In this case since, there is no common value in for all the Keys, I need to throw an exception

/////////////////////////////////////////////////////////////////////////////////////////////////////////////

If there is 3 common values for keys (i.e., as mentioned below)
The Key is: test1
The value is: A
The value is: B

The Key is: test2
The value is: A
The value is: B
The value is: C

The Key is: test3
The value is: C
The value is: A

The Key is: test4
The value is: D

In this case, the output needs to be
The key is: test1 and the value is: A
The key is: test2 and the value is: A
The key is: test3 and the value is: A
The key is: test4 and the value is: D

[no name] 1-Apr-22 11:30am

Group the "values" by value so you wind up with a "distinct" list of values.

Then for each "test", compare the "distinct" list with the "test values". Any "distinct value" not in values for a give test is therefore "not a common value".

A couple of lines of LINQ.

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