Declaring tuple without initializing in C#

Question

I want to use Tuples in my code dynamically and have to assign the values to tuple according to the if statement. I have the following code:

if(check != null)
  var scoreTmpTuple = new Tuple<Guid, string, double>(
    (Guid)row["sampleGuid"],
     Convert.ToString(row["sampleName"]), 
     Convert.ToDouble(row["sampleScore"]));
else
  var scoreTmpTuple = new Tuple<Guid, string, double>(
    (Guid)row["exampleGuid"],
     Convert.ToString(row["exampleName"]), 
     Convert.ToDouble(row["exampleScore"]));

In the code, the tuple is declared inside the if and else statements. I want to declare that outside and initialize the tuple accordingly.

That might work but i had the scope issue for the tuple .. because alot of things are being done after initializing and i want the same tuple for that . — Haroon nasir
– Haroon nasir, Commented Oct 31, 2019 at 10:26
Above c#4, instead of Tuple, you could use dynamic datatype. — Sushant Yelpale
– Sushant Yelpale, Commented Oct 31, 2019 at 10:56

Mei · Accepted Answer · 2019-10-31 10:31:11Z

4

Declare the tuple before the if statement.

Tuple<Guid, string, double> scoreTmpTuple;

if(check != null)
   scoreTmpTuple = new Tuple<Guid, string, double>((Guid)row["sampleGuid"],Convert.ToString(row["sampleName"]), Convert.ToDouble(row["sampleScore"]));

else
   scoreTmpTuple = new Tuple<Guid, string, double>((Guid)row["exampleGuid"],Convert.ToString(row["exampleName"]), Convert.ToDouble(row["exampleScore"]));

answered Oct 31, 2019 at 10:31

Mei

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Comments

Wang Liang · Accepted Answer · 2019-10-31 10:49:35Z

4

Just specify the type explicity instead of using var:

Tuple<Guid, string, double> scoreTmpTuple;

if (check != null)
    scoreTmpTuple = Tuple.Create<Guid, string, double>(Guid.NewGuid(), "hello", 3.14);

edited Oct 31, 2019 at 10:49

Wang Liang

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answered Oct 31, 2019 at 10:22

Alexander

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Comments

Dmitrii Bychenko · Accepted Answer · 2019-10-31 10:31:54Z

2

You can try ternary operator and push ramification within tuple creation:

  var scoreTmpTuple = Tuple.Create(
                (Guid)row[check != null ? "sampleGuid" : "exampleGuid"],
     Convert.ToString(row[check != null ? "sampleName" : "exampleName"]),
     Convert.ToDouble(row[check != null ? "sampleScore" : "exampleScore"])
  );

Or even (if we actually should switch between "sample" and "example" prefixes):

  string prefix = check != null 
    ? "sample"
    : "example";

  var scoreTmpTuple = Tuple.Create(
                (Guid)row[$"{prefix}Guid"],
     Convert.ToString(row[$"{prefix}Name"]),
     Convert.ToDouble(row[$"{prefix}Score"])
  );

edited Oct 31, 2019 at 10:31

answered Oct 31, 2019 at 10:20

Dmitrii Bychenko

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Comments

Gauravsa · Accepted Answer · 2019-10-31 10:47:50Z

1

You can do this:

bool isChecked = check != null;

var scoreTmpTuple = new Tuple<Guid, string, double>(
                      isChecked ? (Guid)row["sampleGuid"] : (Guid)row["exampleGuid"],
                      isChecked ? Convert.ToString(row["sampleName"]) : Convert.ToString(row["exampleName"]), 
                      isChecked ? Convert.ToDouble(row["sampleScore"]) : Convert.ToDouble(row["exampleScore"]));

edited Oct 31, 2019 at 10:47

answered Oct 31, 2019 at 10:27

Gauravsa

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1 Comment

Dmitrii Bychenko Over a year ago

bool isChecked = check != null; is a shorter code

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