I have this list:
public static List<PhraseModel> phraseList;
Where the PhraseModel class looks like this:
public class PhraseModel
{
public string PhraseId { get; set; }
public string English { get; set; }
public string PhraseNum { get; set; }
}
How can I find the maximum value of PhraseNum using LINQ
apologies to those that made the comments. PhraseNum is always an int number but in a string field. It was set to string because of the way it's read from Excel
Linq has a Max extension method. Try like:
phraseList.Max(x=>int.Parse(x.PhraseNum));
You can use .Max()
from Linq. Here you don't need Select()
int result = phraseList.Max(x => int.Parse(x.PhraseNum));
Console.WriteLine(result); //max PhraseNum from list
To avoid exception you can use int.TryParse()
mentioned by @haldo
Like,
//This is C# 7 Out variable feature.
int result = phraseList.Max(p => int.TryParse(p.PhraseNum, out int phraseNumInt) ? phraseNumInt: int.MinValue);
You can use TryParse
instead of Parse
to avoid exception if there's a chance PhraseNum
is not an int.
int tmp;
var max = phraseList.Max(p => int.TryParse(p.PhraseNum, out tmp) ? tmp : int.MinValue);
If you're using C# 7.0 or above you can use the following syntax with inline variable declaration inside the TryParse
:
var max = phraseList.Max(p => int.TryParse(p.PhraseNum, out int tmp) ? tmp : int.MinValue);
Or without the TryParse
:
var max = phraseList.Max(p => int.Parse(p.PhraseNum));
This Code Return 8
PhraseModel phraseModel = new PhraseModel() { PhraseNum = "5" };
phraseList.Add(phraseModel);
PhraseModel phraseModel2 = new PhraseModel() { PhraseNum = "3" };
phraseList.Add(phraseModel2);
PhraseModel phraseModel3 = new PhraseModel() { PhraseNum = "4" };
phraseList.Add(phraseModel3);
PhraseModel phraseModel4 = new PhraseModel() { PhraseNum = "8" };
phraseList.Add(phraseModel4);
int number;
var maxPhraseNumber = phraseList.Select(n => int.TryParse(n.PhraseNum, out number) ? number : 0).Max();
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